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Sample records for decapoda anomura paguridea

  1. The Hermit Crabs (Crustacea Decapoda, Paguridea) of Northwestern North America

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    Mclaughlin, P.A.

    1974-01-01

    A systematic study has been made of the Paguridea (exclusive of the Lithodidae) from northwestern North America. In addition to the redescriptions of all known species, two subgenera are herein raised to generic rank and a new genus is described. Several systematic problems have been resolved, and h

  2. Hermit Crabs (Decapoda: Anomura: Paguridea) from the Seychelles

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    McLaughlin, P.A.; Hogarth, P.J.

    1998-01-01

    A report on the hermit crabs collected during the Netherlands Seychelles Expedition, 1992-1993, supplemented by materials collected for Enterprise Oil and examined by one of the authors. Twentyseven species, representing three families, are recognized, including one new genus and four new species.

  3. Illustrated key for the identification of the mole crabs (Decapoda, Anomura, Hippoidea of the Cuban sea waters

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    Rogelio Lalana

    2013-09-01

    Full Text Available An illustrated key to the identification of the families, four genera and 5 species, as well as a possible additional genus, of the Cuban waters mole crabs (Anomura, Hippoidea are presented. One of these is a new record for Cuba. The general and Cuban distribution of each species and their habitat, are also given.

  4. Crescimento de Aegla manuinflata (Decapoda, Anomura, Aeglidae em ambiente natural

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    André Trevisan

    2011-12-01

    Full Text Available O presente trabalho teve como objetivo avaliar o crescimento de Aegla manuinflata Bond-Buckup & Santos, 2009 em ambiente natural. Para isso foram realizadas coletas mensais de abril de 2006 a maio de 2007 no arroio Passo Taquara, no município de São Pedro do Sul, Rio Grande do Sul, Brasil. Os organismos foram coletados utilizando armadilhas plásticas e puçá. Os espécimes foram sexados e tiveram mensurado o comprimento do cefalotórax (CC, em seguida foram devolvidos ao córrego. O crescimento foi avaliado utilizando o modelo de von Bertalanffy. As curvas de crescimento do cefalotórax, estimadas para machos e fêmeas, são descritas pelas seguintes equações Ct = 28,00 [1 - e-0,0047(t+10,63] e Ct = 25,16 [1 - e-0,0051(t+17,65], respectivamente. Os machos atingem tamanhos maiores que as fêmeas. A longevidade foi estimada em três anos para os machos e dois anos e meio para as fêmeas.

  5. Galatheoid squat lobsters (Crustacea: Decapoda: Anomura from Korean waters

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    Jung Nyun Kim

    2016-10-01

    Full Text Available Abstract Ten species of Galatheoidea (squat lobsters, belonging to two families, were collected in the Korean exclusive economic zone: Galathea balssi Miyake and Baba, 1964, Galathea orientalis Stimpson, 1858, Galathea pubescens Stimpson, 1858, and Galathea rubromaculata Miyake and Baba, 1967 belonging to Galatheidae; Bathymunida brevirostris Yokoya, 1933, Cervimunida princeps Benedict, 1902, Munida caesura Macpherson and Baba, 1993, Munida japonica Stimpson, 1858, Munida pherusa Macpherson and Baba, 1993, and Paramunida scabra (Henderson, 1885 belonging to Munididae. The present study comprises the morphological description of these ten species, including drawings and color photographs, a brief review of their regional records, and a key for their identification. Although all species are common in Japanese waters, G. balssi, G. rubromaculata, B. brevirostris, C. princeps, M. caesura, and M. pherusa are new to Korean marine fauna.

  6. Reproductive behavior of intertidal hermit crabs (Decapoda, Anomura in southeastern Brazil Comportamento reprodutivo de ermitões (Decapoda, Anomura entremarés no sudeste brasileiro

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    Alexander Turra

    2005-06-01

    Full Text Available The reproductive behavior of four intertidal hermit crab species [Clibanarius antillensis Stimpson, 1859, C. sclopetarius (Herbst, 1796, C. vittatus (Bosc, 1802, and Pagurus criniticornis (Dana, 1852] was studied in São Sebastião Channel, southeastern Brazil. The overall behavior followed previous descriptions for Diogenid and Pagurid hermit crabs but some particular differences were recorded. Male to male agonistic encounters over females and guarding behavior were more common to C. sclopetarius, C. vittatus, and Pagurus criniticornis. During guarding, males clearly grasped females' chelipeds, eyestalks, and the margins of their shell apertures. This oblique guarding and, simultaneously, accessing behavior (OGAP has never been described for hermit crabs and was more common to C. sclopetarius and C. vittatus. Pagurus criniticornis did not present the typical jerking behavior of pagurids. Multiple copulations between a single pair were recorded in all species while in only one occasion a female of C. vittatus was observed copulating with two males. In the post-copulatory behavior males held females for some time and, after that, they were left inactive and sometimes totally to partially buried in the substrate. In mating pairs of all species males were larger than females and two individuals (out of 23 of C. antillensis, one (out of 5 of C. sclopetarius and one (out of 3 of C. vittatus, which courted successfully as males fertilizing females' eggs, were demonstrated to be intersex, with both male and female gonopores.O comportamento reprodutivo de quatro espécies de caranguejos ermitões entremarés [Clibanarius antillensis Stimpson, 1859, C. sclopetarius (Herbst, 1796, C. vittatus (Bosc, 1802 e Pagurus criniticornis (Dana, 1852] foi estudado no Canal de São Sebastião, sudeste brasileiro. O comportamento geral destas espécies seguiu descrições prévias para ermitões das famílias Diogenidae e Paguridae mas algumas diferenças foram registradas. Encontros agonísticos entre machos para disputar fêmeas e o comportamento de guarda foram mais comuns a C. sclopetarius, C. vittatus e Pagurus criniticornis. Durante a guarda os machos claramente tocavam os quelípodos, pedúnculos oculares e as margens da abertura das conchas das fêmeas. Este comportamento de guardar e, simultaneamente, estimular as fêmeas em uma posição oblíqua (OGAP nunca havia sido registrado e, no presente estudo, foi mais conspícuo em C. sclopetarius e C. vittatus. Pagurus criniticornis não apresentou o comportamento típico da família Paguridae denominado "jerking" (machos sacudindo as fêmeas. Cópulas múltiplas em um mesmo par foram registradas para todas as espécies enquanto apenas em uma ocasião uma fêmea de C. vittatus foi copulada por dois machos diferentes. Após a cópula os machos continuavam segurando as fêmeas por algum tempo até que elas eram deixadas inativas e, em algumas vezes, totalmente ou parcialmente enterradas no substrato. Os machos foram maiores que as fêmeas nos pares que acasalaram em todas as espécies estudadas e dois indivíduos (de um total de 23 de C. antillensis, um (de 5 de C. sclopetarius e um (de 3 de C. vittatus, que acasalaram com sucesso fertilizando os ovos das fêmeas, foram identificados como intersexo, com gonóporos tanto maculinos quanto femininos.

  7. Dynamics of gonadal development of Aegla platensis Schmitt (Decapoda, Anomura, Aeglidae Dinâmica do desenvolvimento gonadal de Aegla platensis Schmitt (Decapoda, Anomura, Aeglidae

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    Carolina C. Sokolowicz

    2006-12-01

    Full Text Available One way to estimate gonadal development through the reproductive cycle is to observe the growth of the gonads related to the organs used to store energy. The aim of this study was to follow the gonadosomatic and hepatosomatic indexes during annual cycle of Aegla platensis Schmitt, 1942. Adult animals were collected in Taquara, Rio Grande do Sul, Brazil (29°46'S, 50°53'W. Males and females were initially weighed and dissected and had their gonads and hepatopancreas (HP removed and weighed in order to estimate the Gonadosomatic (GI and hepatosomatic (HI indexes. In females, the indexes were also compared to the degree of development of the ovaries. In males the GI showed a peak of gonadal development in the autumn (p Uma maneira de estimar o desenvolvimento gonadal ao longo do ciclo reprodutivo é observar o crescimento das gônadas em relação aos órgãos utilizados para o estoque de energia. O objetivo desse estudo foi acompanhar os índices gonadossomático e hepatossomático durante o ciclo reprodutivo de Aegla platensis Schmitt, 1942. Animais adultos foram coletados em Taquara, Rio Grande do Sul, Brasil (29°46'S, 50°53'W. Machos e fêmeas foram pesados e dissecados, gônadas e hepatopâncreas (HP foram retirados e pesados para obtenção dos índices gonadossomático (IG e hepatossomático (IH. Nas fêmeas, os índices também foram comparados com o grau de desenvolvimento dos ovários. Nos machos o IG mostrou um pico de desenvolvimento gonadal no outono (p < 0,05, quando os valores do IH diminuíram (p < 0,05. Fêmeas mostraram um aumento do IG no final do verão e início do outono (p < 0,05 e os valores do IG aumentaram à medida que o ovário tornava-se maduro. Em A. platensis, tanto nos machos como nas fêmeas, os valores do IH nunca mostraram valores mais baixos que o IG, o que pode indicar que esses aeglídeos apresentam um padrão de utilização de energia diferente dos outros decápodos, onde à medida que o desenvolvimento gonadal aumenta os valores do IH diminuem marcadamente.

  8. Atividade nictimeral e tempo de digestão de Aegla longirostri (Crustacea, Decapoda, Anomura Diel activity and digestion time of Aegla longirostri (Crustacea, Decapoda, Anomura

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    Carolina C. Sokolowicz

    Full Text Available O objetivo do presente trabalho foi caracterizar o ritmo de atividade e tempo de digestão em Aegla longirostri Bond-Buckup & Buckup, 1994. Os animais foram coletados em Santa Maria, RS, Brasil. Em laboratório, os animais foram transferidos para aquários individuais (5L. Para testar a atividade locomotora e alimentar dos aeglídeos um grupo de animais permaneceu sob luminosidade constante durante 12 horas, enquanto outro grupo permanecia no escuro, essa condição sendo invertida a cada 12 horas. As observações foram realizadas a cada 6 horas. Para determinar o tempo de digestão os animais foram alimentados e a cada 30 minutos um indivíduo era sacrificado. Aegla longirostri mostrou menor atividade em períodos de luminosidade, o que aconteceu nos dois grupos de animais. Essa espécie leva aproximadamente 5 horas para concluir a digestão extracelular. Os resultados sugerem que A. longirostri possui hábitos noturnos e provavelmente se alimenta sempre que há recursos disponíveis.The aim of this work was to characterize the diel activity rhythm and time of digestion in Aegla longirostri Bond-Buckup & Buckup, 1994. The individuals were collected in Santa Maria, RS, Brazil. In laboratory, the animals were kept in individuals glass aquariums (5L. To test locomotor and feeding activity of the aeglids, a group remained under constant luminosity for 12 hours, while another group was mantained in the dark, this condition being reversed at each 12 hours. The observations were taken at every 6 hours. For the determination of digestion's time the animals were fed, and one individual was sacrificed at each 30 minutes. Aegla longirostri showed lower activity in periods of light time. This condition was recorded for both groups of animals. This species takes approximately 5 hours to conclude its extracellular digestion. The results suggest that A. longirostri has nocturnal habits and probably feeds whenever resources are available.

  9. Central projections of antennular chemosensory and mechanosensory afferents in the brain of the terrestrial hermit crab (Coenobita clypeatus; Coenobitidae, Anomura

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    Oksana eTuchina

    2015-07-01

    Full Text Available The Coenobitidae (Decapoda, Anomura, Paguroidea is a taxon of hermit crabs that includes two genera with a fully terrestrial life style as adults. Previous studies have shown that Coenobitidae have evolved a sense of spatial odor localization that is behaviorally highly relevant. Here, we examined the central olfactory pathway of these animals by analyzing central projections of the antennular nerve of Coenobita clypeatus, combining backfilling of the nerve with dextran-coupled dye, Golgi impregnations and three-dimensional reconstruction of the primary olfactory center, the antennular lobe. The principal pattern of putative olfactory sensory afferents in C. clypeatus is in many aspects similar to what have been established for aquatic decapod crustaceans, such as the spiny lobster Panulirus argus. However, there are also obvious differences that may, or may not represent adaptations related to a terrestrial lifestyle. In C. clypeatus, the antennular lobe dominates the deutocerebrum, having more than one thousand allantoid-shaped subunits. We observed two distinct patterns of sensory neuron innervation: putative olfactory afferents from the aesthetascs either supply the cap/subcap region of the subunits or they extend through its full depth. Our data also demonstrate that any one sensory axon can supply input to several subunits. Putative chemosensory (non-aesthetasc and mechanosensory axons represent a different pathway and innervate the lateral and median antennular neuropils. Hence, we suggest that the chemosensory input in C. clypeatus might be represented via a dual pathway: aesthetascs target the antennular lobe, and bimodal sensilla target the lateral antennular neuropil and median antennular neuropil. The present data is compared to related findings in other decapod crustaceans.

  10. Intersexuality in the porcellanid crab Pisidia longicornis (Crustacea: Decapoda: Anomura: Porcellanidae

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    Luciane Augusto de Azevedo Ferreira

    2015-04-01

    Full Text Available Intersex specimens of Pisidia longicornis (Linnaeus, 1767 are recorded for the first time and their secondary sexual characters are analyzed. Of 145 specimens of P. longicornis examined in this study, six were identified as intersex individuals. Of these, three presented male secondary sexual characters, well-developed male gonopores and rudimentary female gonopores, whereas the other three had female secondary sexual characters, with female gonopores being more pronounced than the male ones. The present study provides the first record of intersex porcelain crabs.

  11. A new species of Munidopsis Whiteaves, 1874 (Crustacea: Decapoda: Anomura) from the Northwest Indian Ocean Ridge.

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    Dong, Dong; Li, Xinzheng; Zhou, Yadong; Wang, Chunsheng

    2016-08-23

    A new species, Munidopsis militaris n. sp., from the Carlsberg Ridge, Northwest Indian Ocean Ridge is described herein. The species belongs to a group of species having a pair of epigastric spines, mesial and lateral eye-spines, abdominal tergites unarmed, five or six spines on the lateral margin of the carapace, and a denticulate carina on the distolateral margin of the P1 fixed finger. It can be distinguished from its relatives by the spinous lateral margin of the palm and dorsal carinae on the P2-4 propodus. The Munidopsis fauna of the Indian Ocean Ridge is seldom reported on; this new species is the sixth member of this genus found inhabiting the Indian Ocean Ridge.

  12. First Report of Two Diogenid Species of Hermit Crabs (Crustacea: Decapoda: Anomura from Korea

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    Jung, Jibom

    2015-04-01

    Full Text Available Two diogenid hermit crab species, Dardanus lagopodes and Diogenes deflectomanus, are newly reported from Korea. Dardanus lagopodes is distinguished from the other species of genus Dardanus in Korea by having setae with cream-colored tips on the cephalothorax and the following characteristics: ocular peduncles somewhat longer than antennular peduncles, and the pereopod without a longitudinal sulcus and scute-like projections. Diogenes deflectomanus is similar to D. nitidimanus but can be distinguished by having the fixed finger of the left cheliped bent slightly downwardly and the following characteristics: slightly shorter ocular peduncle, elongated left cheliped with small granules on the surface, right cheliped without calcareous teeth on the cutting edge of the dactylus, and the minute spine of post-median margin of the telson is not well developed. The geographical distributions of these two species are extended by the present study. In particular, D. deflectomanus in the current study is the first report outside Chinese waters. Now, 20 species of the family Diogenidae are known in Korean waters.

  13. A New Report of Two Species of Pagurid Hermit Crabs (Crustacea: Decapoda: Anomura from Korea

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    Won Kim

    2014-01-01

    Full Text Available Pagurus undosus and Pagurus parvispina, collected from the East Sea by fishery trap, are newly recorded from Korean waters. Pagurus undosus is distinguished from other hermit crab by its right cheliped slightly elevated medially, and with broad ridge formed by deep depressions mesial and lateral to midline. Pagurus parvispina is distinguished from other hermit crab by its right cheliped covered with large spine and long tufts of setae. These species live in cold water areas and their geographical distribution is extended southwardly by the present study. A specimen of the former species, P. undosus, was found living in a shelter formed by a sponge, similar to that observed in Pagurus pectinatus. Descriptions and figures of these two species are provided in this paper. Currently, 27 species of the genus Pagurus are recorded in Korean fauna.

  14. Hermit crab (Decapoda, Anomura attraction to dead gastropod baits in an infralittoral algae bank

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    Juarez C. B. Pezzuti

    2002-06-01

    Full Text Available Hermit crabs use gastropod shells as shelter and are adapted to follow chemical cues released from tissues of dead or injured gastropods as a way to find new and more adequate shells. The species composition, crab size, shell types adequacy and physical condition were compared between attracted individuals and crabs collected in previous samples. The previous sampling was carried out in five areas before each experiment. Then, five baits of crushed gastropods in nylon net bags were installed in these areas. Three samples were taken at 30min intervals, capturing all crabs within a circle of 60cm diameter. Attraction of hermit crabs was tested for four different gastropod baits to verify specificity of the chemical cues. Clibanarius antillensis, Pagurus brevidactylus and Paguristes tortugae were collected in the study area. Pagurus brevidactylus, the smallest species, turned out to be more attracted than the 2 other species. The results showed that attracted crabs utilized more gastropod shell types than that collected in previous samples, however shell utilization pattern did not differ between them. Attracted animals were slightly smaller (shield length than those collected in the previous samples but did not present significant differences in shell adequacy and condition. The four experimental baits attracted the crabs in similar ways not indicating a specific response from the crabs. The fact that attracted animals were smaller suggested that the attraction to dead gastropods might enable the acquisition of a new and larger shell and, consequently, chains of shell exchange between the attracted crabs.Ermitões utilizam conchas de gastrópodes para abrigo. Conchas novas e mais adequadas podem ser encontradas pelos ermitões pois estes são atraídos por substâncias químicas liberadas pelos tecidos de gastrópodes feridos ou mortos. A adequação, condição e tipo das conchas e a composição de espécies e o tamanho dos ermitões foram comparados entre indivíduos atraídos e os coletados em amostras prévias. Estes últimos ermitões foram coletados em 5 áreas antes de cada experimento. Nestes experimentos, sacos de tela de nylon contendo um gastrópode amassado foram colocadas nas áreas de atração. Foram obtidas 3 amostras por área em intervalos de 30 minutos, coletando-se todos os ermitões dentro de um raio de 30cm em volta da isca. Foi testada a atração a iscas de 4 espécies de gastrópodes para observar a possibilidade de especificidade ao sinal químico. Clibanarius antillensis, Pagurus brevidactylus e Paguristes tortugae foram coletados na área de estudo. Pagurus brevidactylus, a menor espécie, mostrou ser mais atraída do que as outras duas espécies. Verificou-se que os ermitões atraídos utilizaram maior número de tipos de conchas do que os coletados nas amostras prévias, contudo o padrão de utilização de conchas não diferiu. Os ermitões atraídos foram ligeiramente menores (comprimento do escudo cefalotorácico do que os coletados nas amostras prévias mas não mostraram diferenças significativas na condição e adequação das conchas. Os 4 experimentos utilizando diferentes iscas atraíram os ermitões de forma semelhante não havendo indicação de resposta específica. O fato dos ermitões atraídos serem menores que os das amostras prévias sugere que a atração aos gastrópodes mortos pode possibilitar a aquisição de conchas novas e maiores e, conseqüentemente, a ocorrência de uma cadeia de trocas de conchas entre os ermitões atraídos

  15. New record of Paralomis spinosissima Birstein & Vinogradov (Decapoda: Anomura: Lithodidae) from Mar del Plata, Argentina.

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    Olguín, Nicole; Ocampo, Emiliano H; Farias, Nahuel

    2015-05-14

    The lithodid crab Paralomis spinosissima is previously known only in Sub-Antarctic waters from South Georgia Island to the Drake Passage. Here we recorded a juvenile male obtained off shores of Mar del Plata (~37°S), Argentina. This new occurrence extends the distribution range of the species over 1300 km northwards in the Atlantic Ocean.

  16. Uroptychodes, new genus of Chirostylidae (Crustacea: Decapoda: Anomura, with description of three new species

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    Keiji Baba

    2004-03-01

    Full Text Available Examination of materials collected from Indonesia, New Caledonia and vicinity, now deposited in the Muséum National d´Histoire Naturelle, disclosed three additional undescribed species of chirostylids belonging to the Uroptychus spinimarginatus group. The group is now shifted to a distinct genus Uroptychodes. Uroptychus grandirostris Yokoya, 1933, which can be transferred to Uroptychodes, has been a problematic species because of the brevity of the original description and the loss of the type material. However, a recent finding of a specimen, which is in poor condition, very much like the illustration of U. grandirostris by Yokoya (1933: Fig. 29, but different from the description of U. grandirostris given by van Dam (1939 for one of the type specimens, suggests that the type material of U. grandirostris includes at least two species. In this paper a neotype is selected for U. grandirostris. The genus Uroptychodes now contains 10 species. All these species are reviewed and a key to the species of the genus is provided.

  17. Benthic decapod crustaceans associated with captures of Munida spp. (Decapoda: Anomura in the Beagle Channel, Argentina

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    Patricia Pérez Barros

    2004-06-01

    Full Text Available Benthic decapod crustacean assemblages in the Beagle Channel are dominated by the galatheid crabs Munidasubrugosa and Munida gregaria. This study deals with the bathymetric and spatial distribution, density and diversity of the assemblage of decapod species that co-occur with Munida spp. in the Beagle Channel. A total of 131 samples were obtained using an epibenthic trawl from February 1999 to December 2000. They were taken monthly from two depth strata separated by the 40 m isobath (range: 4-262 m, and from three different sites: Bahía Lapataia, Ushuaia and Punta Segunda. Sixteen of the 36 recorded species of decapod crustaceans from the Beagle Channel were caught. Munidasubrugosa and M. gregaria contributed 94% to the total decapod material. Of the remaining 6%, Austropandalusgrayi (Caridea was the most abundant species, constituting 43% of the non-galatheid decapod fraction. Some species, namely Paguruscomptus and Eurypodius spp., were characteristic of shallow waters ( 40 m. The average density and diversity of non-galatheid decapods varied with depth and location. Decapod diversity correlated positively with the density of algae and polychaete tubes. The influence of three-dimensional bottom structure on decapod diversity in the Beagle Channel is discussed.

  18. Composição e distribuição dos Crustácea (Decapoda na Lagoa do Peixe, Rio Grande do Sul, Brasil Composition and distribution of Crustácea (Decapoda from Lagoa do Peixe, Rio Grande do Sul, Brazil

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    Sandro Santos

    2000-03-01

    Full Text Available The Lagoa do Peixe ("Peixe's Lagoon" is located between Atlantic Ocean and Lagoa dos Patos and is 30 Km long and 0,5-2,0 Km wide (31º13'S, 50º55'W -31º26'S, 51º09'. For one year, the composition and distribution of Crustácea Decapoda were analyzed monthly (from July/1994 to June/1995, in seven subareas (terrestrial border and aquatic area and physical and chemical parameters (depth, salinity, sediment texture, oxygen in water, organic material of sediment and water temperature were registered. Decapoda from the families Grapsidae, Ocypodidae, Portunidae (Brachyura, Diogenidae (Anomura and Penaeidae (Penaeidea were captured. Chasmagnathus granulata Dana 1851 was found ali months near the canal connecting Atlantic Ocean and Lagoa do Peixe, but inside the lagoon it was collected only in October/94 and June/95, and in extreme subareas it was sampled in February/95 when the salinity was 31 ‰ at these sites. Callinectes sapidus Rathbun, 1896 and Cyrtograpsus angulatus Dana, 1851 were captured throughout the year, except October/94 and April/95, respectively. Both species were found in ali áreas of sample, indicating a high plasticity in relation to the factors analyzed in this study. Another species captured probably come in the lagoon in specific months, when the environment provides ideal conditions for their develo-pments.

  19. The Crustacea Decapoda of Cyprus

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    Lewinsohn, Ch.; Holthuis, L.B.

    1986-01-01

    An account of the species of Crustacea Decapoda so far known from Cyprus, based on (1) material collected during the 1967-1970 Hebrew University - Smithsonian Institution Joint Program "Biota of the Red Sea and the Eastern Mediterranean", (2) Cyprus material from other sources, and (3) published rec

  20. Comparative brain architecture of the European shore crab Carcinus maenas (Brachyura) and the common hermit crab Pagurus bernhardus (Anomura) with notes on other marine hermit crabs.

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    Krieger, Jakob; Sombke, Andy; Seefluth, Florian; Kenning, Matthes; Hansson, Bill S; Harzsch, Steffen

    2012-04-01

    The European shore crab Carcinus maenas and the common hermit crab Pagurus bernhardus are members of the sister taxa Brachyura and Anomura (together forming the taxon Meiura) respectively. Both species share similar coastal marine habitats and thus are confronted with similar environmental conditions. This study sets out to explore variations of general brain architecture of species that live in seemingly similar habitats but belong to different major malacostracan taxa and to understand possible differences of sensory systems and related brain compartments. We examined the brains of Carcinus maenas, Pagurus bernhardus, and three other hermit crab species with immunohistochemistry against tyrosinated tubulin, f-actin, synaptic proteins, RF-amides and allatostatin. Our comparison showed that their optic neuropils within the eyestalks display strong resemblance in gross morphology as well as in detailed organization, suggesting a rather similar potential of processing visual input. Besides the well-developed visual system, the olfactory neuropils are distinct components in the brain of both C. maenas and P. bernhardus as well as the other hermit crabs, suggesting that close integration of olfactory and visual information may be useful in turbid marine environments with low visibility, as is typical for many habitats such as, e.g., the Baltic and the North Sea. Comparing the shape of the olfactory glomeruli in the anomurans showed some variations, ranging from a wedge shape to an elongate morphology. Furthermore, the tritocerebrum and the organization of the second antennae associated with the tritocerebrum seem to differ markedly in C. maenas and P. bernhardus, indicating better mechanosensory abilities in the latter close to those of other Decapoda with long second antennae, such as Astacida, Homarida, or Achelata. This aspect may also represent an adaptation to the "hermit lifestyle" in which competition for shells is a major aspect of their life history. The shore

  1. Estrutura populacional de Petrolisthes armatus (Gibbes (Decapoda, Anomura, Porcellanidae da Ilha do Farol, Matinhos, Paraná, Brasil Population structure of Petrolisthes armatus (Gibbes (Decapoda, Anomura, Porcellanidae from Farol Isle, Matinhos, Paraná, Brazil

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    Edinulva Oliveira

    1995-01-01

    Full Text Available Population structure of the porcelain crab Petrolisthes armatus (Gibbes, 1850 from the rocky shore of the Farol isle (25º51'S, 48º32'W was carried out in the following aspects: annual fluctuation of the density, distribution of the developmental stages and sexes over year round, size composition and recruiting period of juveniles into the population. Monthly collections were made in the three sites of the midlittoral, from November/89 to April/91, with the aid of a trap. The air temperature ranged from 13ºC to 28ºC, that of the surface water from 16ºC lo 29ºC and the salinity of the surface water from 06.7‰ to 31.5‰. A total of 5.585 individuals of Petrolisthes armatus was collected, among which, 116 were in the megalopa stage, 1,579 juveniles, 830 immature males, 729 immature females, 1,161 mature males, 744 mature females and 426 ovigerous females. The population density ranged from 15.3 to 305.0 ind.m-2, with a peak in January. This density is the highest among the porcelain crab populations known from the literature. The species has continuous reproduction, but, there were two main cohorts in the year: summer one that was longer and more abundant and the winter one that was shorter and the less numerous.

  2. Beitrag zur Kenntnis und Verbreitung von Galathea Australiensis Stimpson, 1858, (Crustacea Decapoda, Anomura, Galatheidae) nebst Beschreibung eines Neotypus

    NARCIS (Netherlands)

    Lewinsohn, Ch.

    1967-01-01

    Anlässlich der Vorbereitung einer Publikation über die Anomuren des Roten Meeres, wurde u.a. auch Material der Gattung Galathea dieser Region untersucht. Dabei ergab sich das Problem einer richtigen Bestimmung von Galathea australiensis Stimpson, 1858. Diese Art wurde von Balss (1915: 2-3), an Hand

  3. Shell occupation and microhabitat use by hermit crabs (Decapoda: Anomura on Fortaleza beach, Ubatuba, São Paulo

    Directory of Open Access Journals (Sweden)

    Giuliano Buzá Jacobucci

    2009-06-01

    Full Text Available Most species of hermit crabs use the empty shells of gastropods as mobile shelters. The variation of shell availability in different microhabitats can reduce competitive interactions between sympatric species, favoring their coexistence. This work aimed to characterize the occupation of gastropod shells by three species of hermit crabs, and assessing the availability of shells and evaluating the use of microhabitats crabs and gastropods in an infralitoral area on the north coast of São Paulo state. For this purpose, transect lines were established and all hermit crabs, gastropods and empty shells found were collected, recording the type of microhabitat used. In a sub-sample, the hermit crabs were identified and classified into reproductive categories. The shells used by the crabs were identified and evaluated according to physical damage and incrustation. Three species of hermit crabs (Paguristes tortugae, Pagurus brevidactylus and Pagurus criniticornis were recorded, using 15 species of gastropod shells and one of scaphopod (Dentalium sp.. Physical damage and incrustation of shells were significantly different among the hermit crab species. Considering microhabitat use, P. tortugae and P. brevidactylus were mainly found in calcareous algae, while P. criniticornis mainly occurred in sand substrate. Despite the differences in shell and microhabitat use, the high resource overlap, especially by the pagurids, indicates that competitive interactions are important regulatory factors for these populations.

  4. Uroptychus atlanticus, a new species of squat lobster (Crustacea: Decapoda: Anomura: Chirostylidae) from the western Atlantic Ocean.

    Science.gov (United States)

    Baba, Keiji; Wicksten, Mary K

    2017-02-02

    A new species of squat lobster, Uroptychus atlanticus, is described on the basis of a female specimen taken at a depth of 713-841 m in the southeastern Gulf of Mexico. The new species is readily distinguished from all known species of the genus from the western Atlantic by the very spinose carapace and pereopods, and a transverse row of spines on each of the abdominal tergites 1 and 2.

  5. Revealing their innermost secrets: an evolutionary perspective on the disparity of the organ systems in anomuran crabs (Crustacea: Decapoda: Anomura)

    NARCIS (Netherlands)

    Keiler, J.; Richter, S.; Wirkner, C.S.

    2016-01-01

    The Southern Australian crustacean species Lomis hirta (Lomisoidea: Lomisidae) is a representative of one of the three anomuran taxa which obtained their crab-like habitus independently from each other. This process, the evolutionary transformation into a crab-like form, is termed carcinization. To

  6. Gastroptychus Cavimurus sp. nov., a new Chirostylid (Crustacea, Decapoda, Anomura) from off the western coast of South America

    NARCIS (Netherlands)

    Baba, K.

    1977-01-01

    During the second cruise of the Japanese Research Vessel "Kaiyo Maru" to the western coast of South America in 1968-69, Dr. Osame Tabeta of the Shimonoseki University of Fisheries, then on the staff of the Kyushu University, collected a number of galatheids off the northern Peruvian coast. All of th

  7. Afinidades biogeográficas de los galateoideos (Decapoda: Anomura del Caribe y Pacífico colombiano

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    Gabriel R. Navas S.

    2013-08-01

    Full Text Available Objetivo. Determinar la distribución y afinidades biogeográficas de los galateoideos de aguas colombianas con base en la literatura y muestras recolectadas durante expediciones realizadas entre 1999 y 2002. Materiales y métodos. Se recolectaron ejemplares en 100 estaciones entre 20 y 550 m de profundidad en el Caribe y Pacífico colombiano. El material recolectado, junto con la información geográfica existente en literatura para las especies conocidas para Colombia se emplearon para realizar mapas de distribución, los cuales se compararon con el “Mapa de ecorregiones marinas del mundo”. Resultados. Se obtuvo la información geográfica para 3247 ejemplares recolectados de 18 especies de los géneros Agononida, Anomoeomunida, Munida, Munidoposis y Pleuroncodes, y se complementó con la obtenida a partir de la literatura para las 40 especies de la superfamilia con presencia conocida en aguas colombianas. Se generaron cinco grupos principales de distribución: especies restringidas al Caribe, al Caribe y Atlántico occidental, Anfiatlánticas, restringidas al Pacífico oriental y Anfiamericanas. Se encontró que el 53 % de las especies recolectadas en el Caribe se presentan también en la provincia Atlántico Norte Cálido-Templado, y para el Océano Pacífico la mayor afinidad se da con la provincia Pacífico Oriental Tropical. Conclusiones. Los galateoideos en aguas colombianas presentan ámbitos geográficos y batimétricos amplios, presentándose simpatría entre algunas especies. Las de aguas someras presentan mayores restricciones que aquellas de distribución en aguas profundas. Los mecanismos de distribución de las especies corresponden con el ciclo de vida de cada una y las corrientes predominantes en las provincias.

  8. First Record of Hippa adactyla (Fabricius, 1787; Crustacea, Anomura, Hippidae) from Indonesian Waters.

    Science.gov (United States)

    Ardika, Puji Utari; Farajallah, Achmad; Wardiatno, Yusli

    2015-12-01

    Specimens of Hippa adactyla (Crustacea, Anomura, Hippidae) were collected from several coasts of Indonesia (Sumatera, Java, Bali-Lombok and Sulawesi). This finding represents the first record of this species in Indonesia and confirms its presence in the Indian Ocean and in the Wallacea region. Its systematic and morphological characteristics are described, and its distribution in Indonesia is presented. One of the main characteristics of this species is a median lobe in the anterior part of the carapace, which has 3-4 lobes. Likewise, the left antenna has 2-6 articles.

  9. Clustering behavior of hermit crabs (Decapoda, Anomura) in an intertidal rocky shore at São Sebastião, southeastern Brazil.

    Science.gov (United States)

    Turra, A; Leite, F P

    2000-02-01

    The clustering behavior and cluster composition of hermit crabs as well as the patterns of shell utilization of clustered and scattered individuals were studied. This study was conducted in the intertidal region of Grande Beach, São Sebastião, southeastern Brazil. Samples were taken both in randomized transects and 1 m2 quadrats during low tide periods. Crabs were counted, measured (shield length), and sexed. Shells were identified and had their adequacy and condition (physical damage and incrustation) recorded. Clusters occurred mainly in air exposed areas and were dominated or composed only by Clibanarius antillensis. Other species like Paguristes tortugae, Pagurus criniticornis, and Calcinus tibicen were also present in these clusters, but in small numbers. Only one monospecific aggregation composed by individuals of P. criniticornis was recorded in tide pools. Almost all crabs were inactive, despite some that were submerged in tide pools. Most of the individuals of C. antillensis were clustered (70.88%). Scattered individuals were larger than clustered ones and occupied mainly shells of Tegula viridula, which seemed to be the most adequate shell to the crabs. Clustered individuals used less incrusted shells than isolated ones. In general, clustering in Grande Beach presented the same patterns of size and sex distribution, and shell utilization than others already studied, with the exception of the smaller cluster size registered in this area.

  10. NEW SPECIES OF PARALOMIS (DECAPODA, ANOMURA, LITHODIDAE) FROM A SUNKEN WHALE CARCASS IN THE SAN CLEMENTE BASIN OF SOUTHERN CALIFORNIA. (U915626)

    Science.gov (United States)

    The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Concl...

  11. Ovicides paralithodis (Nemertea, Carcinonemertidae, a new species of symbiotic egg predator of the red king crab Paralithodes camtschaticus (Tilesius, 1815 (Decapoda, Anomura

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    Hiroshi Kajihara

    2013-01-01

    Full Text Available Ovicides paralithodis sp. n. is described from the egg mass of the red king crab Paralithodes camtschaticus (Tilesius, 1815 from the Sea of Okhotsk, off Hokkaido, Japan, and Alaska, USA. Among four congeners, O. paralithodis can be distinguished from O. julieae Shields, 2001 and O. davidi Shields and Segonzac, 2007 byno eyes; from O. jonesi Shields and Segonzac, 2007 by the presence of basophilic, vacuolated glandular lobes in the precerebral region; and from O. jasoni Shields and Segonzac, 2007 by the arrangement of the acidophilic submuscular glands, which are not arranged in a row. Ovicides paralithodis represents the third described species of egg-predatory nemertean from P. camtschaticus, the second described carcinonemertid species from Japan, and the 21st described species in the family. The intensity of infestations may exceed 24,000 worms per a single egg-bearing pleopod of P. camtschaticus. A preliminary molecular phylogenetic analysis based on sequences of 28S rRNA and cytochrome c oxidase subunit I genes among selected monostiliferous hoplonemertean species supported the monophyly of Carcinonemertidae, suggesting that within the lineage of the family, evolution of the unique vas deferens, Takakura’s duct, preceded loss of accessory stylets and accessory-stylet pouches.

  12. Additional records of the pagurid hermit crab genus Trichopagurus de Saint Laurent, 1968 (Crustacea: Decapoda: Anomura), with description of a new species from the Philippines.

    Science.gov (United States)

    Komai, Tomoyuki

    2013-01-01

    The pagurid hermit crab genus Trichopagurus de Saint Laurent, 1968 is currently represented by three shallow water spe- cies from the tropical Indo-West Pacific region. In this paper, three species of the genus, including one new species, are reported. Trichopagurus tenuidactylus n. sp. is described on the basis of a single ovigerous female from the Bohol Sea, the Philippines, and compared with two close relatives, T. asper Komai & Poupin, 2012 and T. macrochela Komai & Os- awa, 2005. New locality records are provided for T. macrochela (the Philippines) and T. trichophthalinus (Forest, 1954) (Taiwan and Marianas). An identification key to the four species of the genus is presented.

  13. Ovicides paralithodis (Nemertea, Carcinonemertidae), a new species of symbiotic egg predator of the red king crab Paralithodes camtschaticus (Tilesius, 1815) (Decapoda, Anomura).

    Science.gov (United States)

    Kajihara, Hiroshi; Kuris, Armand M

    2013-01-01

    Ovicides paralithodis sp. n. is described from the egg mass of the red king crab Paralithodes camtschaticus (Tilesius, 1815) from the Sea of Okhotsk, off Hokkaido, Japan, and Alaska, USA. Among four congeners, Ovicides paralithodis can be distinguished from Ovicides julieae Shields, 2001 and Ovicides davidi Shields and Segonzac, 2007 by having no eyes; from Ovicides jonesi Shields and Segonzac, 2007 by the presence of basophilic, vacuolated glandular lobes in the precerebral region; and from Ovicides jasoni Shields and Segonzac, 2007 by the arrangement of the acidophilic submuscular glands, which are not arranged in a row. Ovicides paralithodis represents the third described species of egg-predatory nemertean from Paralithodes camtschaticus, the second described carcinonemertid species from Japan, and the 21st described species in the family. The intensity of infestations may exceed 24,000 worms per a single egg-bearing pleopod of Paralithodes camtschaticus. A preliminary molecular phylogenetic analysis based on sequences of 28S rRNA and cytochrome c oxidase subunit I genes among selected monostiliferous hoplonemertean species supported the monophyly of Carcinonemertidae, suggesting that within the lineage of the family, evolution of the unique vas deferens, Takakura's duct, preceded loss of accessory stylets and accessory-stylet pouches.

  14. Ovicides paralithodis (Nemertea, Carcinonemertidae), a new species of symbiotic egg predator of the red king crab Paralithodes camtschaticus (Tilesius, 1815) (Decapoda, Anomura)

    OpenAIRE

    Hiroshi Kajihara; Armand Kuris

    2013-01-01

    Ovicides paralithodis sp. n. is described from the egg mass of the red king crab Paralithodes camtschaticus (Tilesius, 1815) from the Sea of Okhotsk, off Hokkaido, Japan, and Alaska, USA. Among four congeners, O. paralithodis can be distinguished from O. julieae Shields, 2001 and O. davidi Shields and Segonzac, 2007 byno eyes; from O. jonesi Shields and Segonzac, 2007 by the presence of basophilic, vacuolated glandular lobes in the precerebral region; and from O. jasoni Shields and Segonzac, ...

  15. COMPOSICIÓN Y DISTRIBUCIÓN DE LOS ENSAMBLAJES DE CRUSTÁCEOS GALATEOIDEOS (DECAPODA: ANOMURA PRESENTES EN AGUAS COLOMBIANAS

    Directory of Open Access Journals (Sweden)

    Navas Suárez Gabriel Rodolfo

    2012-12-01

    Full Text Available La caracterización de la megafauna de la plataforma y talud superior del Caribe yparte norte del Pacífico colombianos, realizada por diferentes exploraciones entre1998 y 2009, confirma la riqueza específica, abundancia e importancia ecológicade las familias de galateoideos (Munididae y Munidopsidae. Sus especies formanconglomerados que en las partes más someras parecen estar condicionados por lapresencia de hábitats particulares como formaciones coralinas de profundidad, aprofundidades intermedias por las variaciones más importantes en las característicasde las masas de agua, y a mayores profundidades por características biológicas de lasespecies, que les permiten adaptarse a la heterogeneidad ecológica de la costa hastalos 500 m de profundidad. No se observó una relación clara entre la formación deconglomerados de estaciones y la sectorización por ecorregiones propuesta para elmar Caribe colombiano

  16. Method of capture and population structure of Aegla georginae Santos and Jara, 2013 (Decapoda: Anomura: Aeglidae in a tributary of the Ibicuí River in southern Brazil

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    C. E. Copatti

    Full Text Available Abstract In the current study, we investigated population aspects of Aegla georginae in the Ibicuí River Basin by considering different capture methods and the implication of these data in the analysis of population dynamics. We sampled 1774 individuals: 1259 males (21 and 97 juveniles and 1029 and 113 adults in trap and handnet, respectively, 512 females (05 and 140 juveniles, 184 and 64 adults, and 81 and 38 ovigerous in trap and handnet, respectively and 03 unsexed individuals (02 and 01 in trap and handnet, respectively. The frequency distribution in size classes shows a bimodal model for both sexes. The carapace length (CL in males and females varied from 3.11 to 26.00 and 3.73 to 22.36 mm, respectively. Males presented significantly larger sizes than females. The relative abundance between males and females was significantly different from 1:1 with more males than females in most sampling periods (p 0.05. Juveniles were recorded in all seasons, and reproduction occurs throughout the year. The population structure is similar to the model known for aeglids, and the capture methods affected the analysis of A. georginae, where the grouped data and trap captures presented greater abundance of individuals than handnet and males predominate in the larger size classes, and females in the intermediary size classes. Therefore, an integrated view of the capture methods is the best model for studying the population dynamics of aeglids.

  17. NEW SPECIES OF PARALOMIS (DECAPODA, ANOMURA, LITHODIDAE) FROM A SUNKEN WHALE CARCASS IN THE SAN CLEMENTE BASIN OF SOUTHERN CALIFORNIA. (U915626)

    Science.gov (United States)

    The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Concl...

  18. Distribución de cangrejos ermitaños (Anomura: Paguroidea en el mar Caribe colombiano Hermit crabs (Anomura: Paguroidea distribution patterns in the Colombian Caribbean Sea

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    Bibian Martínez Campos

    2012-03-01

    Full Text Available Los cangrejos ermitaños son un grupo representativo de la fauna marina del Caribe colombiano, además, son importantes en el mantenimiento del equilibrio dinámico, en los ecosistemas por sus interacciones ecológicas y también por el impacto en la estabilidad de las redes tróficas. Sus patrones de distribución se identificaron mediante análisis multivariados de clasificación y ordenación espacial, se usaron registros históricos desde 1916 hasta el 2006. Los resultados indican diferencias por profundidad entre la fauna costera y la del talud continental y diferencias en la distribución latitudinal, en donde se encontraron tres grupos: Noreste, Centro y Suroeste, sustentados por diferencias en la composición faunística. Con base en los mapas de ecosistemas marinos de Colombia, se determinó que los principales factores que afectan su distribución son la influencia del talud Caribaná (profundidad, la temperatura de las masas de agua, las praderas de pastos marinos de la Guajira y las condiciones particulares de las ecorregiones Archipiélagos coralinos y Darién. Se identificó la distribución mundial de las especies colombianas y su afinidad geográfica, y se encontró mayor afinidad con el Atlántico norte y las Antillas que con el Atlántico sur y el Golfo de México, asimismo, las subprovincias geográficas que incluyen a Colombia son zonas de transición dentro de la subprovincias septentrionales y australes del Gran CaribeHermit crabs (Anomura: Paguroidea distribution patterns in the Colombian Caribbean Sea. Hermit crabs represent the marine life in the Colombian Caribbean, and are important for the dynamic equilibrium maintenance in ecosystems, the ecological interactions and their impact on food web stability. Generally, in order to come up with some conservation strategies, strong bio-geographical information is needed for policies definition. With this aim, this study analyzed the distribution patterns of hermit crabs in

  19. Brain architecture in the terrestrial hermit crab Coenobita clypeatus (Anomura, Coenobitidae, a crustacean with a good aerial sense of smell

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    Hansson Bill S

    2008-06-01

    Full Text Available Abstract Background During the evolutionary radiation of Crustacea, several lineages in this taxon convergently succeeded in meeting the physiological challenges connected to establishing a fully terrestrial life style. These physiological adaptations include the need for sensory organs of terrestrial species to function in air rather than in water. Previous behavioral and neuroethological studies have provided solid evidence that the land hermit crabs (Coenobitidae, Anomura are a group of crustaceans that have evolved a good sense of aerial olfaction during the conquest of land. We wanted to study the central olfactory processing areas in the brains of these organisms and to that end analyzed the brain of Coenobita clypeatus (Herbst, 1791; Anomura, Coenobitidae, a fully terrestrial tropical hermit crab, by immunohistochemistry against synaptic proteins, serotonin, FMRFamide-related peptides, and glutamine synthetase. Results The primary olfactory centers in this species dominate the brain and are composed of many elongate olfactory glomeruli. The secondary olfactory centers that receive an input from olfactory projection neurons are almost equally large as the olfactory lobes and are organized into parallel neuropil lamellae. The architecture of the optic neuropils and those areas associated with antenna two suggest that C. clypeatus has visual and mechanosensory skills that are comparable to those of marine Crustacea. Conclusion In parallel to previous behavioral findings of a good sense of aerial olfaction in C. clypeatus, our results indicate that in fact their central olfactory pathway is most prominent, indicating that olfaction is a major sensory modality that these brains process. Interestingly, the secondary olfactory neuropils of insects, the mushroom bodies, also display a layered structure (vertical and medial lobes, superficially similar to the lamellae in the secondary olfactory centers of C. clypeatus. More detailed analyses with

  20. Descrição de um Novo Decapoda (Natantia, Malacostraca, Crustacea

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    Márcia Aparecida Fernandes dos Reis

    2005-08-01

    Full Text Available A “lobster” fossil from the Riachuelo Formation, Sergipe Sub-basin, is here described and placed in the Decapoda, Infraorder Palinura, based on the flattened carapace and the well-developed abdomen. The specimen is characterized by a dorsal median keel and a keel in each margin of the carapace and abdomen. Field data and petrographic studies suggest that the environment in which the Decapoda lived was probably a place with waves and moderate currents, located behind a sand barrier or in within a lagoon. Apparently, the carbonization process was responsible for specimen preservation.

  1. Studies on planktonic decapoda and stomatopoda (Crustacea) from the Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.; Goswami, S.C.; Nair, V.R.

    An account of a qualitative and quantitative analysis of the planktonic decapoda and stomatopoda collected during R.V Gaveshani Cruises 10, 12, 13 in the Arabian Sea is given. Area surveyed lies between latitudes 07 degrees 00' and 20 degrees 00'N...

  2. Optics and phylogeny: is there an insight? The evolution of superposition eyes in the Decapoda (Crustacea)

    NARCIS (Netherlands)

    Gaten, Edward

    1998-01-01

    This paper addresses the use of eye structure and optics in the construction of crustacean phylogenies and presents an hypothesis for the evolution of superposition eyes in the Decapoda, based on the distribution of eye types in extant decapod families. It is suggested that reflecting superposition

  3. Shallow-water anomuran and brachyuran crabs (Crustacea: Decapoda from southern Bahia, Brazi l Cangrejos anomuros y braquiuros (Crustacea: Decapoda de aguas someras del sur de Bahia, Brasil

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    Alexandre O Almeida

    2010-01-01

    Full Text Available The objective of this study was to determine the taxonomic composition and ecological aspects of decapods crustacean species belonging to the infraorders Anomura and Brachyura in shallow marine and estuarine waters from southern Bahia, a coastline about 640 km in extent, corresponding to approximately 7% of the Brazilian coast. Sixteen species of the infraorder Anomura and 68 of the infraorder Brachyura are reported for the study area. The most important families in terms of number of species were the Panopeidae with 11 species, and the Ocypodidae and Portunidae with 9. Among the Brachyura, the southern distribution of the species Austinixa leptodactyla Coelho, 1997 (Pinnotheridae, endemic to Brazil, is extended from the coast of Sergipe to Bahía (Prado, Cumuruxatiba Beach, 17°06'18.6"S, 39°10'50.4"W. The ocypodid Uca (Leptuca cumulanta Crane, 1943 and also the pinnotherids Austinixa aidae (Righi, 1967 and Fabia byssomiae (Say, 1818 are reported for the first time from the Bahia coast. The specimen of F. byssomiae examined was collected in the mantle cavity of the clam Macoma constrict (Bruchiére, 1792 (Bivalvia: Tellinidae, a new host record for the species.El objetivo del presente estudio fue determinar la composición taxonómica y aspectos ecológicos de los crustáceos decápodos pertenecientes a los infraórdenes Anomura y Brachyura, en aguas someras, marinas y estuarinas del sur de Bahia, Brasil, una línea costera con cerca de 640 km de extensión, que corresponde aproximadamente al 7% de la costa brasileña. Para esta area de estudio se registraron 16 especies del infraorden Anomura y 68 del infraorden Brachyura. Las familias más representativas en términos de número de especies fueron Panopeidae, con 11 especies, y Ocypodidae y Portunidae, ambas con nueve especies. Entre los Brachyura, la distribución meridional de Austinixa leptodactyla Coelho, 1997 (Pinnotheridae, endémica del Brasil, se extiende desde la costa de Sergipe

  4. BIODIVERSITY AND BIOGEOGRAPHY OF FRESHWATER CRUSTACEANS (DECAPODA: NATANTIA FROM VANUATU, A COMPARISON WITH FIJI AND NEW CALEDONIA.

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    MARQUET G.

    2002-01-01

    Full Text Available This is the first comprehensive study of freshwater decapoda crustaceans from Vanuatu. Of the nineteen species collected during this study, eighteen appear to be new records for the archipelago. However none of these species is endemic to Vanuatu, nine having a Pacific distribution and ten an Indo-Pacific distribution. Half of the species recorded were widely distributed in Vanuatu, whereas the others were more restricted. A comparison is made with the freshwater decapoda fauna of the two neighbouring archipelagoes namely, those of Fiji and New Caledonia, which have already been thoroughly surveyed.

  5. Differentiation of three common deep-water hermit crabs (Crustacea, Decapoda, Anomura, Parapaguridae from the South African demersal abundance surveys, including the description of a new species of Paragiopagurus Lemaitre, 1996

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    Jannes Landschoff

    2017-05-01

    Full Text Available Deep-water hermit crabs of the family Parapaguridae can be abundant (up to 20 kg or 1000 hermit crab individuals per haul in the trawl bycatch collected during South African demersal abundance research surveys. Until recently, only two parapagurid species had been recognized in the bycatch; Parapagurus bouvieri Stebbing, 1910, and Sympagurus dimorphus (Studer, 1883. Detailed examination of numerous samples of parapagurid specimens from research surveys revealed the existence of a third, undescribed species previously confounded with S. dimorphus, but in fact belonging to a different genus. This new species, Paragiopagurus atkinsonae sp. n. is the 25th in the genus Paragiopagurus Lemaitre, 1996, and has been found only in a small region on the West Coast shelf of South Africa, at depths of 199–277 m. The species is herein fully described and illustrated, including colour images, µCT scans of selected body parts, and CO1 barcode data. The new species is morphologically most similar to P. ventilatus Lemaitre, 2004, a species associated with hydrothermal vents, but differs in armature of the fourth antennal segment (armed with a spine on the dorsolateral distal angle vs. unarmed in P. ventilatus; setation of the antennal flagella (nearly naked vs. with dense setae in P. ventilatus; plumose setation on the third maxillipeds and basal segments of chelipeds (absent vs. present in P. ventilatus; number of rows of scales on the propodal rasp of pereopod 4 (two or three rows vs. one row in P. ventilatus; and degree of telson asymmetry (weakly asymmetrical vs. strongly asymmetrical in P. ventilatus. Paragiopagurus atkinsonae sp. n. is superficially similar to S. dimorphus, with males of the two species showing the same extreme degree of sexual dimorphism on the right cheliped, general light orange colouration, and frequent use of colonial zoanthid carcinoecia for pleonal protection. To aid in future identifications and to facilitate data gathering during surveys, a comparison of P. atkinsonae sp. n. with S. dimorphus is provided, along with descriptions of colouration and photographs of live specimens of all three parapagurid species. Information on taxonomy of the species is summarized, as well as knowledge of their distribution in the demersal research survey regions of South Africa.

  6. "Symmetrical" hermit crabs of the family Pylochelidae (Crustacea: Decapoda: Anomura) collected by the "BIOPAPUA" and "PAPUA NIUGINI" expeditions in the Papua New Guinea, with descriptions of two new species.

    Science.gov (United States)

    Komai, Tomoyuki; Chan, Tin-Yam

    2016-03-09

    Collections made during the recent expeditions to Papua New Guinea ("BIOPAPUA", 2010; "PAPUA NIUGINI", 2012) yielded a total of 12 species from the "symmetrical" hermit crab family Pylochelidae, including two new to science: Bathycheles incisus (Forest, 1987), B. integer (Forest, 1987), Cheiroplatea laticauda Boas, 1926, C. pumicicola Forest, 1987, C. rotundioculus n. sp., Pylocheles mortensenii Boas, 1926, and Xylocheles macrops (Forest, 1987) (Pylochelinae); Parapylocheles scorpio (Alcock, 1894), Trizocheles manningi Forest, 1987, T. moosai Forest, 1987, T. sakaii Forest, 1987, and T. spinidigitus n. sp. (Trizochelinae). Affinities of the two new species are discussed. Parapylocheles scorpio, Trizocheles manningi and T. sakaii are recorded from the South Pacific for the first time. Revised identification keys to species of Cheiroplatea and Trizocheles are provided.

  7. Typtonomenaeusformosanus gen. et sp. nov., a new sponge-associated pontoniine shrimp (Crustacea: Decapoda: Palaemonidae: Pontoniinae) from northern Taiwan.

    Science.gov (United States)

    Marin, Ivan; Chan, Tin-Yam

    2013-01-01

    A new genus and species of sponge-associated pontoniine shrimps (Crustacea: Decapoda: Palaemonidae: Pontoniinae) is described from northern part of Formosa Island (Taiwan). The new species can be clearly recognized by convex robust nail-like apices on dactyli of both pereiopods II--a unique morphological structure among pontoniine shrimps. Morphological differences from all known sponge-associated pontoniine genera are discussed.

  8. First record of Puerulus mesodontus Chan, Ma & Chu, 2013 (Crustacea, Decapoda, Achelata, Palinuridae) from south of Java, Indonesia.

    Science.gov (United States)

    Wardiatno, Yusli; Hakim, Agus Alim; Mashar, Ali; Butet, Nurlisa Alias; Adrianto, Luky; Farajallah, Achmad

    2016-01-01

    Three specimens of Puerulus mesodontus Chan, Ma & Chu, 2013 (Crustacea, Decapoda, Achelata, Palinuridae) were collected from Palabuhanratu Bay, southern Java, Indonesia. There is no previous record on the presence of the species in Indonesia. This finding represents the first record of this species in Java, Indonesia, and confirms that the species is present in the Indian Ocean. The morphological characters of the species are described. This paper contains a new distribution record of a lobster species from Indonesian waters.

  9. First stage larva of the mud shrimp Nihonotrypaea makarovi Marin, 2013 (Decapoda: Axiidea: Callianassidae) obtained in the laboratory.

    Science.gov (United States)

    Korn, Olga M; Kornienko, Elena S; Golubinskaya, Darya D

    2016-02-19

    First stage larva of a new mud shrimp Nihonotrypaea makarovi Marin, 2013 (Decapoda: Axiidea: Callianassidae) obtained from the ovigerous female is described and illustrated for the first time. The first zoea of N. makarovi is well distinguished from the first larvae of N. japonica and N. petalura, sympatric callianassid species inhabiting Russian waters of the Sea of Japan, only by the greater size and by the presence of two terminal setae on the antennal endopod.

  10. Occurence of the Asian shrimp Palaemon macrodactylus in the Southern bight of the North Sea, with a key to the Palaemonidae of North-western Europe (Crustacea: Decapoda: Caridea)

    NARCIS (Netherlands)

    d'Udekem d'Azoc, C.; Faasse, M.; Dumoulin, E.; Blauwe, de H.

    2005-01-01

    Het voorkomen van de rugstreepsteurgarnaal Palaemon macrodactylus in de zuidelijke bocht van de Noordzee, met een determinatiesleutel tot de Palaemonidae van Noordwest-Europa (Crustacea: Decapoda: Caridea) In 1999 werd de rugstreepsteurgarnaal Palaemon macrodactylus Rathbun, 1902, een soort

  11. Influência da Serra do Mar na distribuição e biologia de Aeglidae (Crustacea, Anomura) na porção leste do Estado do Paraná

    OpenAIRE

    2013-01-01

    Resumo: Um estudo sobre os padrões de distribuição dos eglídeos (Crustacea, Anomura, Aeglidae) com ocorrência no Estado do Paraná e a variação intraespecífica morfológica de Aegla schmitti dentre populações isoladas pelo conjunto de montanhas da Serra do Mar foi realizado. A análise do padrão de distribuição foi realizado principalmente com base em visitas à coleções científicas, porém coletas adicionais foram realizadas, especialmente nas bacias hidrográficas dos rios Iguaçu, Ribeira do Igua...

  12. Evolution and phylogeny of the mud shrimps (Crustacea: Decapoda revealed from complete mitochondrial genomes

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    Lin Feng-Jiau

    2012-11-01

    Full Text Available Abstract Background The evolutionary history and relationships of the mud shrimps (Crustacea: Decapoda: Gebiidea and Axiidea are contentious, with previous attempts revealing mixed results. The mud shrimps were once classified in the infraorder Thalassinidea. Recent molecular phylogenetic analyses, however, suggest separation of the group into two individual infraorders, Gebiidea and Axiidea. Mitochondrial (mt genome sequence and structure can be especially powerful in resolving higher systematic relationships that may offer new insights into the phylogeny of the mud shrimps and the other decapod infraorders, and test the hypothesis of dividing the mud shrimps into two infraorders. Results We present the complete mitochondrial genome sequences of five mud shrimps, Austinogebia edulis, Upogebia major, Thalassina kelanang (Gebiidea, Nihonotrypaea thermophilus and Neaxius glyptocercus (Axiidea. All five genomes encode a standard set of 13 protein-coding genes, two ribosomal RNA genes, 22 transfer RNA genes and a putative control region. Except for T. kelanang, mud shrimp mitochondrial genomes exhibited rearrangements and novel patterns compared to the pancrustacean ground pattern. Each of the two Gebiidea species (A. edulis and U. major and two Axiidea species (N. glyptocercus and N. thermophiles share unique gene order specific to their infraorders and analyses further suggest these two derived gene orders have evolved independently. Phylogenetic analyses based on the concatenated nucleotide and amino acid sequences of 13 protein-coding genes indicate the possible polyphyly of mud shrimps, supporting the division of the group into two infraorders. However, the infraordinal relationships among the Gebiidea and Axiidea, and other reptants are poorly resolved. The inclusion of mt genome from more taxa, in particular the reptant infraorders Polychelida and Glypheidea is required in further analysis. Conclusions Phylogenetic analyses on the mt genome

  13. Brain architecture of the largest living land arthropod, the Giant Robber Crab Birgus latro (Crustacea, Anomura, Coenobitidae: evidence for a prominent central olfactory pathway?

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    Krieger Jakob

    2010-09-01

    Full Text Available Abstract Background Several lineages within the Crustacea conquered land independently during evolution, thereby requiring physiological adaptations for a semi-terrestrial or even a fully terrestrial lifestyle. Birgus latro Linnaeus, 1767, the giant robber crab or coconut crab (Anomura, Coenobitidae, is the largest land-living arthropod and inhabits Indo-Pacific islands such as Christmas Island. B. latro has served as a model in numerous studies of physiological aspects related to the conquest of land by crustaceans. From an olfactory point of view, a transition from sea to land means that molecules need to be detected in gas phase instead of in water solution. Previous studies have provided physiological evidence that terrestrial hermit crabs (Coenobitidae such as B. latro have a sensitive and well differentiated sense of smell. Here we analyze the brain, in particular the olfactory processing areas of B. latro, by morphological analysis followed by 3 D reconstruction and immunocytochemical studies of synaptic proteins and a neuropeptide. Results The primary and secondary olfactory centers dominate the brain of B. latro and together account for ca. 40% of the neuropil volume in its brain. The paired olfactory neuropils are tripartite and composed of more than 1,000 columnar olfactory glomeruli, which are radially arranged around the periphery of the olfactory neuropils. The glomeruli are innervated ca. 90,000 local interneurons and ca. 160,000 projection neurons per side. The secondary olfactory centers, the paired hemiellipsoid neuropils, are targeted by the axons of these olfactory projection neurons. The projection neuron axonal branches make contact to ca. 250.000 interneurons (per side associated with the hemiellipsoid neuropils. The hemiellipsoid body neuropil is organized into parallel neuropil lamellae, a design that is quite unusual for decapod crustaceans. The architecture of the optic neuropils and areas associated with antenna two

  14. New distribution ranges and records of caridean shrimps (Crustacea: Decapoda: Caridea from the west coast of Mexico Nuevos intervalos de distribución y registros de camarones carideos (Crustacea: Decapoda: Caridea de la costa oeste de México

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    Michel E. Hendrickx

    2011-04-01

    Full Text Available Geographic records are presented for 24 species of Caridea (Crustacea: Decapoda along Pacific coast of Mexico, in the East Pacific. New records are presented for Psathyrocaris fragilis Wood-Mason, 1893 (from Peru to Mexico, Periclimenes infraspinis (Rathbun, 1902, Pontonia margarita Smith, 1869, Alpheus cristulifrons Rathbun, 1900, Alpheus umbo Kim & Abele, 1988, Automate rugosa Coutière, 1900, and Lysmata californica (Stimpson, 1866 (within the Gulf of California, and Typton hephaestus Holthuis, 1951 (from the Gulf of California to the Gulf of Tehuantepec, Mexico. Aditional records are given that establish the presence of species at intermediate localities within the Gulf of California and along the southwestern coast of Mexico.Se recolectaron especímenes de 24 especies de Caridea (Crustacea: Decapoda en la costa del Pacífico de México, en el Pacífico Este. Nuevos registros geográficos son señalados para Psathyrocaris fragilis Wood-Mason, 1893 (desde Perú hasta México, Periclimenes infraspinis (Rathbun, 1902, Pontonia margarita Smith, 1869, Alpheus cristulifrons Rathbun, 1900, Alpheus umbo Kim & Abele, 1988, Automate rugosa Coutière, 1900 y Lysmata californica (Stimpson, 1866 (en el Golfo de California y para Typton hephaestus Holthuis, 1951 (del Golfo de California hasta el Golfo de Tehuantepec, México. Se proporciona información adicional acerca de la presencia de algunas especies en localidades intermedias en el Golfo de California y a lo largo de la costa suroeste de México.

  15. The complete mitogenome of the hydrothermal vent crab Xenograpsus testudinatus (Decapoda, Brachyura) and comparison with brachyuran crabs.

    Science.gov (United States)

    Ki, Jang-Seu; Dahms, Hans-Uwe; Hwang, Jiang-Shiou; Lee, Jae-Seong

    2009-12-01

    In this study, we analyzed the complete mitochondrial (mt) genome of a hydrothermal vent crab Xenograpsus testudinatus (Decapoda: Brachyura) obtained from the hydrothermal vents off Kueishantao Island, Taiwan, which extend from the deep sea Okinawa Trench. The mitogenome of X. testudinatus was 15,796 bp in length and contained the same 37 genes (e.g. 2 rRNAs, 22 tRNAs, and 13 PCGs) found in other metazoan mitogenomes. Analysis of the structural mt gene order in X. testudinatus revealed that the 13 PCGs, excluding a translocation of ND6-Cyt b cluster, were similarly ordered when compared to the pancrustacean ground pattern; however the tRNAs were severely rearranged. Phylogenetic analysis of decapod mitogenomes showed that the molecular taxonomy of the vent crab was in accordance with its morphological systematics. Together, these findings suggest that the vent crab studied here has little mitochondrial genetic variation when compared with morphologically defined conspecifics from other marine habitats.

  16. Distribuição e ecologia dos decapoda numa área estuarina de Ubatuba (SP

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    Jorge de Abreu

    1980-12-01

    Full Text Available Benthic macro fauna (Decapoda was sampled by beam trawl at 6 stations in Bay of Fortaleza and adjacents Escuro e Claro rivers (São Paulo, Ubatuba, Brasil. Samples were taken monthly during 1973-1974. Diversity was high in muddy sand sites of Bay of Fortaleza and low at very shallow stations located in the rivers, where the effects of extreme fluctuations of salinity were evident. The changes in species composition appeared to correspond most clearly to differences in salinity. The total number of species of decapods collected in the areas was 27 (14 species of Natantia and 13 of Reptantia. Juveniles of Penaeus brasiiiensis and Penaeus paulensis reach the rivers. Callinectes danae live in the Bay and in the rivers. Xiphopeneus kroyeri is a specie who inhabit the Bay of Fortaleza in high populational density.

  17. Morphology and histochemistry of the aesthetasc-associated epidermal glands in terrestrial hermit crabs of the genus Coenobita (Decapoda: Paguroidea.

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    Oksana Tuchina

    Full Text Available Crustaceans have successfully adapted to a variety of environments including fresh- and saltwater as well as land. Transition from an aquatic to a terrestrial lifestyle required adaptations of the sensory equipment of an animal, particularly in olfaction, where the stimulus itself changes from hydrophilic to mainly hydrophobic, air-borne molecules. Hermit crabs Coenobita spp. (Anomura, Coenobitidae have adapted to a fully terrestrial lifestyle as adults and have been shown to rely on olfaction in order to detect distant food items. We observed that the specialized olfactory sensilla in Coenobita, named aesthetascs, are immersed in a layer of mucous-like substance. We hypothesized that the mucous is produced by antennal glands and affects functioning of the aesthetascs. Using various microscopic and histochemical techniques we proved that the mucous is produced by aesthetasc-associated epidermal glands, which we consider to be modified rosette-type aesthetasc tegumental glands known from aquatic decapods. These epidermal glands in Coenobita are multicellular exocrine organs of the recto-canal type with tubulo-acinar arrangement of the secretory cells. Two distinct populations of secretory cells were clearly distinguishable with light and electron microscopy. At least part of the secretory cells contains specific enzymes, CUB-serine proteases, which are likely to be secreted on the surface of the aesthetasc pad and take part in antimicrobial defense. Proteomic analysis of the glandular tissue corroborates the idea that the secretions of the aesthetasc-associated epidermal glands are involved in immune responses. We propose that the mucous covering the aesthetascs in Coenobita takes part in antimicrobial defense and at the same time provides the moisture essential for odor perception in terrestrial hermit crabs. We conclude that the morphological modifications of the aesthetasc-associated epidermal glands as well as the functional characteristics

  18. Desenvolvimento e morfologia funcional dos estÃmagos de larvas e pÃs-larvas dos crustÃceos Decapoda

    OpenAIRE

    Marlon Aguiar Melo

    2005-01-01

    O conhecimento sobre o correto regime alimentar das larvas e pÃslarvas dos crustÃceos Decapoda à considerado essencial para o sucesso no cultivo larval. InformaÃÃes sobre o desenvolvimento e morfologia dos apÃndices bucais e estÃmago destes crustÃceos tÃm auxiliado na identificaÃÃo de alimentos e condiÃÃes de cultivo satisfatÃrias para o aumento da sobrevivÃncia e do crescimento durante o desenvolvimento larval. O desenvolvimento da estrutura do estÃmago e da funÃÃo digestiva f...

  19. Efectos del rizocéfalo Loxothylacus armatus (Cirripedia: Rhizocephala en el cangrejo Paraxanthus barbiger (Decapoda: Brachyura en Chile Effects of the rhizocephalan Loxothylacus armatus (Cirripedia: Rhizocephala on the crab Paraxanthus barbiger (Decapoda: Brachyura in Chile

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    MARIO GEORGE-NASCIMENTO

    2006-06-01

    Full Text Available Diversas asociaciones biológicas de amplia distribución y alta especificidad en el ambiente marino han pasado casi desapercibidas para los estudiosos en Chile. Aquí se describe cuantitativamente la infección por Loxothylacus armatus Boschma 1949 (Cirripedia: Rhizocephala en el cangrejo Paraxanthus barbiger (Poeppig 1836 (Decapoda: Brachyura y se evalúa si el parásito produce efectos semejantes a los descritos para asociaciones similares. Para ello, 513 ejemplares del cangrejo fueron recolectados manualmente desde el submareal somero, entre septiembre y octubre de 2003, en Lenga, Octava Región de Chile. La prevalencia de rizocéfalos alcanzó valores máximos cercanos al 60 % en hospedadores de pequeño tamaño corporal, provocando castración, inhibiendo el desarrollo gonadal de las hembras y modificando el tamaño de los caracteres sexuales secundarios en ambos sexos, lo que sugiere que impone una gran demanda sobre su hospedador. Estos resultados muestran una gran similitud con otros estudios que involucran a rizocéfalos, y podrían, al incorporar a las simbiosis en el estudio de las comunidades bentónicas en Chile, conducir a que se reinterprete, por ejemplo, la abundancia y patrones de reproducción de P. barbiger, una especie de depredador prominente de esas comunidades bentónicasIn the marine realm, several biological associations are distributed worldwide and are highly specific, but remain poorly studied in Chile. Here, we describe quantitatively the infection by the barnacle Loxothylacus armatus Boschma 1949 (Cirripedia: Rhizocephala in the crab Paraxanthus barbiger (Poeppig 1836 (Decapoda: Brachyura, and assess if the parasite effects are similar to rhizocephalan-decapod associations elsewhere. To do this, 513 crabs were collected by hand while scuba diving between September and October, 2003 in the shallow subtidal zone of Lenga (37° S, Chile. Maximum prevalence reached ca. 60 % in small body size hosts, producing total

  20. Crustacea Decapoda captured through a passive collection in a stretch of Rio dos Mangues (Porto Seguro – Bahia – Brazil

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    Rafael Ribeiro Teixeira

    2012-11-01

    Full Text Available This paper aimed to carry out, through passive collection, a survey of Crustacea Decapoda species present in a stretch of Rio dos Mangues (Porto Seguro – Bahia – Brazil, during spring season of 2009. The collections were carried out in five sites, distributed over the final 10km of the river, using traps containing biological bait left underwater for 15h. To assess the abiotic variables, temperature, pH, and conductivity values were measured. A total of 135 individuals was registered, belonging to three species: the shrimps Macrobrachium acanthurus (Wiegmann, 1836 and M. olfersi (Wiegman, 1836, besides the crab Trichodactylus fluviatilis Latreille, 1828. In addition to these, two other crab species were collected: Goniopsis cruentata (Latreille, 1803 and Panopeus lacustris Desbonne, 1867. The highest values were registered in P4 (34.07% of individuals, P1 (23.70%, and P3 (22.96%. Temperature and pH presented a small variation throughout the analyses (respectively, 5.1-5.8 and 25.7-29.1°C. In turn, conductivity differed the estuary point (P5 from the other ones (respectively, 886mS and 41-48mS. No individual was registered in P2. The distribution of species was related to the type of microhabitat and the habit of each of them.

  1. Descripción y distribución geográfica de una nueva especie para el archipiélago Juan Fernández: Platymera gaudichaudii (H. Milne-Edwards, 1837 (Decapoda, Calappidae

    Directory of Open Access Journals (Sweden)

    Marco A Retamal

    2013-11-01

    Full Text Available Se identifica una nueva especie en aguas del archipiélago Juan Fernández: Platymera gaudichaudii (Decapoda, Calappidae, ampliándose su distribución geográfica conocida en el hemisferio sur. Se entrega una diagnosis de la especie y se actualiza el status taxonómico de otras tres especies de decápodos en este archipiélago.

  2. Crecimiento del cangrejo Callinectes danae (Decapoda: Portunidae de la Isla de Margarita, Venezuela

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    Jesylén Castillo

    2011-12-01

    Full Text Available Las especies del género Callinectes sostienen pesquerías importantes en varias partes del mundo. En el occidente de Venezuela, Callinectes sapidus es capturado con palangre y sostiene una pesquería artesanal importante en el Lago de Maracaibo; mientras que en la Isla de Margarita, Callinectes danae es capturado con nasa en zonas cercanas a lagunas costeras y su pesca está limitada por la oferta y la demanda. Estos recursos son de considerable importancia económica entre los crustáceos comestibles; sin embargo, pocos estudios han sido reportados sobre la dinámica poblacional y potencialidad pesquera en ambientes costeros de Venezuela que contribuyan a la toma de decisiones en la administración pesquera. En este documento se presenta información de los parámetros de crecimiento del cangrejo Callinectes danae Smith, 1869, con el fin de obtener un conocimiento detallado del patrón de crecimiento y lograr estimaciones más precisas sobre el tamaño de la población y su disponibilidad para la explotación. Se analizó una muestra constituida por 3 623 ejemplares capturados con nasa cangrejera por la flota artesanal, entre octubre 2007 y septiembre 2008. Se estableció la relación longitud-peso y se estimaron los parámetros de crecimiento de las curvas en longitud y peso del modelo de von Bertalanffy. La proporción sexual global mostró que no existe diferencia significativa entre machos y hembras (χ2=0.04, p>0.05. Los valores de las pendientes b entre machos y hembras presentaron diferencias significativas (ts=2.75, pDana Swimming crab growth Callinectes danae (Decapoda: Portunidae from Margarita Island, Venezuela. Callinectes danae is a common species captured with crab traps in nearby areas of coastal lagoons in Margarita Island. Although its considerable economic importance as a fishery resource, few studies have been done on population dynamics and its fishery potential in local coastal environments to support decision making in

  3. Systematic and evolutionary insights derived from mtDNA COI barcode diversity in the Decapoda (Crustacea: Malacostraca.

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    Joana Matzen da Silva

    Full Text Available BACKGROUND: Decapods are the most recognizable of all crustaceans and comprise a dominant group of benthic invertebrates of the continental shelf and slope, including many species of economic importance. Of the 17635 morphologically described Decapoda species, only 5.4% are represented by COI barcode region sequences. It therefore remains a challenge to compile regional databases that identify and analyse the extent and patterns of decapod diversity throughout the world. METHODOLOGY/PRINCIPAL FINDINGS: We contributed 101 decapod species from the North East Atlantic, the Gulf of Cadiz and the Mediterranean Sea, of which 81 species represent novel COI records. Within the newly-generated dataset, 3.6% of the species barcodes conflicted with the assigned morphological taxonomic identification, highlighting both the apparent taxonomic ambiguity among certain groups, and the need for an accelerated and independent taxonomic approach. Using the combined COI barcode projects from the Barcode of Life Database, we provide the most comprehensive COI data set so far examined for the Order (1572 sequences of 528 species, 213 genera, and 67 families. Patterns within families show a general predicted molecular hierarchy, but the scale of divergence at each taxonomic level appears to vary extensively between families. The range values of mean K2P distance observed were: within species 0.285% to 1.375%, within genus 6.376% to 20.924% and within family 11.392% to 25.617%. Nucleotide composition varied greatly across decapods, ranging from 30.8 % to 49.4 % GC content. CONCLUSIONS/SIGNIFICANCE: Decapod biological diversity was quantified by identifying putative cryptic species allowing a rapid assessment of taxon diversity in groups that have until now received limited morphological and systematic examination. We highlight taxonomic groups or species with unusual nucleotide composition or evolutionary rates. Such data are relevant to strategies for conservation of

  4. A review of Epipenaeon ingens Nobili, 1906 (Isopoda: Bopyridae) host species and documentation of a new host, Metapenaeopsis stridulans (Alcock, 1905) (Decapoda: Penaeidae)

    Institute of Scientific and Technical Information of China (English)

    M. RAJKUMAR; S.MANOKARAN; SUN Jun; J.P.TRILLES

    2011-01-01

    We collected 3 596 Metapenaeopsis stridulans (Decapoda: Penaeidae) from the southeast coast of India between January and December 2007. Sixty three specimens (43 females and 18 males) were parasitized by the bopyrid isopod Epipenaeon ingens (Isopoda: Bopyridae). This is the first report of the occurrence of E. ingens in this host; therefore, it was considered as a new host record. The highest level of infestation (3.2%) occurred in October 2007, coincident with observations of gravid females (9). The total prevalence and presence of gravid females were 17.46% and 28%, respectively. Infestation caused a characteristic bulge of the branchial chamber, growth retardation, and degeneration of the sex organs, but had no effect on the host weight.

  5. First inventory of the Crustacea (Decapoda, Stomatopoda) of Juan de Nova Island with ecological observations and comparison with nearby islands in the Mozambique channel (Europa, Glorieuses, Mayotte)

    Science.gov (United States)

    Poupin, J.

    2016-04-01

    Crustacea Decapoda and Stomatopoda are inventoried for the first time in Juan de Nova Island, Iles Eparses, Mozambique channel. In total, 112 species are reported: 69 crabs, 28 anomurans, 11 shrimps, 3 mantis shrimps and 1 lobster. A comparison is made with nearby islands in the Mozambique channel: Glorieuses Islands (157 species), Europa Island (178 species), and Mayotte Island (505 species). The lower species richness at Juan de Nova is explained by the small size of the island and by the difficulties to collect the crustaceans on the reef flat hardly accessible at low tide. The crustaceans are listed by main habitats from land to outer reef (2-20 m). The presence of the coconut crab (Birgus latro), an endangered species vulnerable to human predation, is confirmed.

  6. Composition and spatial distribution of subtidal decapoda on the "Reef Coast", northeastern Brazil, evaluated through a low-impact visual census technique

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    Bruno W. Giraldes

    Full Text Available This study investigated the composition and spatial distribution of the sublittoral decapods on the reefs of Porto de Galinhas Beach, southern coast of Pernambuco, Brazil, through the Underwater Visual Census technique. Data were collected monthly, at night during full-moon tides in low tide periods from June 2004 to May 2005, using SCUBA diving and a visual census with a fixed belt transect (20 m long. Three sampling areas were defined: Confined Waters (low hydrodynamics with shallow sites (up to 2.5 m deep; Semi-open Water (3 to 6 m deep, influenced by waves and tidal currents (moderate hydrodynamics; and Open Water (7 to 10 m deep, in the breaker zone (high hydrodynamics. A total of 6,287 individuals of 34 species belonging to the infraorders Brachyura (19 species, Achelata and Anomura (5 species each, Caridea (3 species, and Stenopodidea and Astacidea (1 species each were collected. Two decapod assemblages were distinguished: in a habitat with low hydrodynamics and shallow (Confined water; and in a habitat with moderate to high hydrodynamics and depths of 3 to 10 m (Semi-open and Open water. At the sites with high hydrodynamics, i.e., the Open-water Area in the breaker zone, decapod diversity was significantly lower than in the other, protected areas on the reef bench. These results suggest that the distribution of subtidal decapods on coastal reefs is influenced by depth and exposure to water stress caused by waves and currents (hydrodynamics. The visual census technique with SCUBA proved to be suitable for ecological studies on subtidal decapods.

  7. Biodiversidad, morfometría y alimentación de los cangrejos del género Callinectes (Decapoda: Portunidae en Santiago de Cuba

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    Liliana Gómez Luna

    2009-09-01

    Full Text Available El objetivo del presente trabajo es el estudio del género Callinectes en la zona costera del municipio de Santiago de Cuba. Se realizó una recolecta de 257 ejemplares durante marzo de 2007 a abril de 2008, en ocho estaciones a lo largo de la costa. El género resultó estar ampliamente distribuido en el litoral y representado al menos por cuatro especies: C. sapidus, C. similis, C. rathbunae y C. larvatus, las dos últimas no incluidas en la lista publicada de crustáceos (Crustacea: Decapoda cubanos. Las especies más abundantes resultaron ser C. sapidus y C. similis. C. rathbunae fue la más ampliamente distribuida. El análisis del contenido estomacal permitió identificar nueve categorías alimentarias, siendo las más importantes los peces y las macroalgas. Las especies de Callinectes tienen un amplio espectro trófico; comen no sólo lo disponible, sino también lo más abundante.Biodiversity, morphometry and diet of Callinectes crabs (Decapoda: Portunidae in Santiago de Cuba. On the basis of fishery intensity and proximity to river mouth, a total of 257 swimming Callinectes crabs were collected from March 2007 to April 2008 in eight localities. Captures were made with hanging nets, to a maximal depth of 1.5m, establishing a top time of 2 hr. The genus was widely distributed, and it is represented at least by four species: C. sapidus, C. similis, C. rathbunae and C. larvatus, the last two not included in the last list of Cuban crustaceans (Crustacea: Decapoda. The size and shape of the gonopods were very useful as taxonomical criteria, considering the prevalence of males. The most abundant species were C. sapidus (47.08%, and C. similis (30.35%. C. rathbunae, which was identified at 75% (6 of the localities, showed a better distribution, followed by C. sapidus, which appears in the 63% (5. Sex rate (Rs by species (male:female was 6.20 for C. rathbunae, 3.58 for C. similis, 1.40 for C. larvatus and 0.40 for C. sapidus. The most abundant

  8. Abbreviation of larval development and extension of brood care as key features of the evolution of freshwater Decapoda.

    Science.gov (United States)

    Vogt, Günter

    2013-02-01

    The transition from marine to freshwater habitats is one of the major steps in the evolution of life. In the decapod crustaceans, four groups have colonized fresh water at different geological times since the Triassic, the freshwater shrimps, freshwater crayfish, freshwater crabs and freshwater anomurans. Some families have even colonized terrestrial habitats via the freshwater route or directly via the sea shore. Since none of these taxa has ever reinvaded its environment of origin the Decapoda appear particularly suitable to investigate life-history adaptations to fresh water. Evolutionary comparison of marine, freshwater and terrestrial decapods suggests that the reduction of egg number, abbreviation of larval development, extension of brood care and lecithotrophy of the first posthatching life stages are key adaptations to fresh water. Marine decapods usually have high numbers of small eggs and develop through a prolonged planktonic larval cycle, whereas the production of small numbers of large eggs, direct development and extended brood care until the juvenile stage is the rule in freshwater crayfish, primary freshwater crabs and aeglid anomurans. The amphidromous freshwater shrimp and freshwater crab species and all terrestrial decapods that invaded land via the sea shore have retained ocean-type planktonic development. Abbreviation of larval development and extension of brood care are interpreted as adaptations to the particularly strong variations of hydrodynamic parameters, physico-chemical factors and phytoplankton availability in freshwater habitats. These life-history changes increase fitness of the offspring and are obviously favoured by natural selection, explaining their multiple origins in fresh water. There is no evidence for their early evolution in the marine ancestors of the extant freshwater groups and a preadaptive role for the conquest of fresh water. The costs of the shift from relative r- to K-strategy in freshwater decapods are traded

  9. Distribución espacial de Ocypode quadrata (Decapoda: Ocypodidae en ocho playas de la zona norte oriental de Cuba

    Directory of Open Access Journals (Sweden)

    Frank A. Ocaña

    2012-09-01

    Full Text Available Uno de los organismos más comunes en las playas arenosas son los miembros del género Ocypode conocidos como cangrejos fantasmas, están ampliamente distribuidos en las regiones tropicales y subtropicales; además tienen un importante papel en la transferencia de energía en diferentes niveles tróficos. El objetivo del presente trabajo es dar a conocer aspectos relacionados con la variación espacial de la densidad de O. quadrata en playas con diferente nivel de influencia humana en la costa norte oriental de Cuba. En mayo de 2010, fueron contadas un total de 355 galerías en 360 unidades de muestreo. La composición por clases de tallas fue de 237 galerías de jóvenes y 118 de adultos. Del total de galerías contadas el 74% ocuparon el nivel P1, 20% el nivel P2 y 6% el nivel P3. La densidad varió entre 0.06-0.52galerías/m2. A pesar del nivel de influencia humana, la mayoría de las playas no mostró diferencias significativas en la densidad de galerías (Scheffé, p>0.05. La densidad de individuos en la zona superior de resaca del oleaje es mayor (Scheffé, pSpatial distribution of Ocypode quadrata (Decapoda: Ocypodidae in eight beaches of NorthEastern Cuba. Studies on the ecology of Ocypode quadrata have been mostly carried out in the Northern and Southern part of its distribution range. In despite that this species is common in Cuban beaches, there are no quantitative studies regarding its abundance and spatial distribution. The aim of this study was to report some aspects about the spatial variation of O. quadrata density in sandy beaches, with different levels of human influence, in the North coast of Eastern Cuba. For this, on May 2010, eight beaches with different levels of human influence were surveyed. On each beach, the number of crabs burrows were counted in 45 quadrats of 4m2 located in three different strata (P1, P2 and P3. According to burrow opening diameter, crabs were separated into young and adults forms. To determine the

  10. TECHNICAL NOTE A NEW, VOLUNTEER-BASED, COST EFFECTIVE METHOD FOR ZOOLOGICAL MAPPING: THE PHOTO IDENTIFICATION OF FRESHWATER CRAYFISH (CRUSTACEA: DECAPODA SPECIES AND THE IMPORTANCE OF VOLUNTEERS IN CRAYFISH RESEARCH

    Directory of Open Access Journals (Sweden)

    PUKY M.

    2006-01-01

    Full Text Available The publication of the European Crayfish Atlas within the framework of the CRAYNET programme is a major breakthrough in Decapoda mapping in Europe. The current data base contains information from approximately 60-70% of the 50 km × 50 km squares covering the continent. A new method to improve this situation further is the use of photo identification involving volunteers in the collection of distribution data. The crayfish identification ability of two potential user groups, astacologists and biology teachers/students, was tested using the questionnaire given in Figure 2. One picture (Astacus leptodactylus male was correctly identified by everyone, the others were recognised by 59-94% (astacologists and 30-88% (non-crayfish specialised biology teachers and students. The first European Decapoda photo identification survey proved that the necessary expertise exists in the continent to determine crayfish species from pictures and also that the quality of the pictures is less important than the presence of key details. Photo identification is a low cost and environmental-friendly approach but it also needs special considerations. Volunteers need to be supported in several ways, such as by providing precise and interesting educational material in an easily understandable language describing e.g. the key parts of the body to photograph. However, the general use of digital cameras and even mobile phones/cameras and the Internet is an effective way to launch such surveys as it gives, on one hand, an opportunity for the specialists to check, and if necessary correct, the field identification of less experienced people and, on the other hand, it provides a much larger data base than what is available now by using the data collected by students, conservationists, scouts or other volunteers.

  11. CARDISOMA ARMATUM (DECAPODA)

    African Journals Online (AJOL)

    armatum may be useful in food formulations involving beverages and meat products. Calcium recorded the ... analyzed for by employing the method reported by. Vanado Molybate and ... advantageous in terms of the shelf-life of the sample.

  12. Crecimiento y reproducción del camarón Atya margaritacea (Decapoda: Atyidae en el Río Presidio, Sinaloa, México

    Directory of Open Access Journals (Sweden)

    Jesús Sánchez Palacios

    2008-06-01

    Full Text Available Se estudiaron el crecimiento y reproducción de de Atya margaritacea, con base en 542 organismos capturados en cinco sitios distribuidos desde la parte media de la cuenca hasta la desembocadura del río Presidio (Sinaloa, NW de México. La recolecta se realizó mediante el empleo de una red Surber, recolectándose organismos cuya longitud total y peso total variaron de 15 a 96 mm y 0.1 a 25.2 g respectivamente. La proporción macho:hembra fue 1.96:1 y los machos alcanzaron las mayores tallas y pesos. La relación entre la longitud total (Lt y el peso total (Pt se estableció mediante el modelo Pt = 1.02x10-5 (Lt3.2089 para los machos y por Pt = 2.29x10-5 (Lt3.0159 para las hembras. El crecimiento en machos resultó alométricamente positivo mientras que en hembras fue isométrico. La regresión entre la longitud total y longitud cefalotórax (Lc fue Log Lc = 1.1118 (Log Lt- 0.6087 en machos y Log Lc = 0.9945 (Log Lt- 0.4321 en hembras. El crecimiento relativo entre estas partes del cuerpo resultó alométrico positivo en machos e isométrico en hembras, indicando un claro dimorfismo sexual de estos organismos. Hembras ovígeras se presentaron en la época de lluvias (julio a noviembre. La fecundidad absoluta varió de 1 860 a 22 400 huevos en hembras de 43 y 59 mm de longitud y de 1.9 a 6.0 g de peso. La ecuación que relacionó el número de huevos con la longitud y peso, fue Fec = 8.3x10-7 (Lt5.8053 y Fec = 732 (Pt1.836 respectivamente.Growth and reproduction of the shrimp Atya margaritacea (Decapoda: Atyidae in Río Presidio, Sinaloa, Mexico. Some growth and reproduction parameters of the population of the shrimp Atya margaritacea in Presidio River (Sinaloa, NW Mexico were studied using 542 organisms collected with a Surber net in five sampling locations distributed from mid- to low river. Total lengths and gross weights ranged from 15 to 96 mm and 0.1 to 25.2 g. The male:female ratio was 1.96:1 and males had larger sizes and weights. The

  13. Efecto tóxico de DDT y endosulfan en postlarvas de camarón blanco, Litopenaeus vannamei (Decapoda:Penaeidaede Chiapas,México

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    Vicente Castro-Castro

    2005-06-01

    Full Text Available Con el fin de conocer la toxicidad del DDT y endosulfan sobre postlarvas de camarón blanco (Litopenaeus vannaei, se realizaron pruebas de toxicidad aguda en condiciones de laboratorio por 168 h, con temperatura de 29 ± 1 °C, salinidad de 3 ± 1 ‰ y pH en 8 ± 1.Se calculó la concentración letal media (LC50 , la LC50 "incipiente", los tiempos medios de muerte (LT50 , la Máxima Concentración Aceptable del Tóxico (MACT y el "Nivel de Seguridad" (LS; así mismo, en los organismos sobrevivientes se determinó la concentración a la que el crecimiento de los organismos se reduce en un 5 y 50% (CE5 y CE50 . Se evaluaron además las alteraciones en el consumo de oxígeno. El DDT fue 3 veces más tóxico que el endosulfan; sin embargo, los organismos resultaron ser muy sensibles a ambos compuestos. La tasa de crecimiento de las postlarvas disminuyó en un 80 y 50% para el DDT y endosulfan respectivamente. La baja resistencia de las postlarvas al DDT y endosulfan, y las concentraciones de estos compuestos en la laguna, sugieren que si se diera un ingreso adicional de estos plaguicidas al sistema, es muy probable un potencial impacto en la producción de camarón del sistemaToxic efect of DDT and endosulfan in white shrimp postlarvae Litopenaeus vannamei (Decapoda: Penaeidae from Chiapas, Mexico .We analized acute toxicity in white shrimp (Litopenaeus vannamei postlarvae exposed to two chlorinated pesticides, DDT and endosulfan, under laboratory conditions during 168 hours, with controlled temperature (29 ± 1°C, salinity (3 ± 1 ‰ and pH (8 ± 1. Median lethal concentrations (LC50 , "incipient" LC50, median lethal time (LT50 the "maximum acceptable concentration of the toxic compound" (MACT and "the safety level" (SL were determined. The concentration of the compounds at which organism growth was reduced by 5 and 50% (EC5 and EC50 , as well as changes in oxygen consumption patterns were determined in the surviving postlarvae.They were very

  14. Padrão de deslocamento do camarão marinho Litopenaeus vannamei (Boone (Crustacea, Decapoda, Penaeidae nas fases clara e escura ao longo de 24 horas Displacement pattern of marine shrimp Litopenaeus vannamei (Boone, 1931 (Crustacea, Decapoda, Penaeidae in light and dark phases during a 24-hour period

    Directory of Open Access Journals (Sweden)

    Cibele S. Pontes

    2006-03-01

    Full Text Available O padrão diário de atividade de Litopenaeus vannamei (Boone, 1931 (Crustacea, Decapoda, Penaeidae é ainda pouco entendido. Com o objetivo de fornecer subsídios para otimizar o manejo nas fazendas de cultivo através do estudo do comportamento deste animal, foram desenvolvidos experimentos com juvenis (7,57 ± 1,01 g, mantidos em aquários (30 l. Para registro da atividade, os aquários foram submetidos a fotoperíodo artificial (fase do claro e do escuro, 12h:12 h, sendo monitorados 16 camarões (33 m² em cada fase, durante 20 dias, em janelas de 15 min a cada hora. A alimentação foi fornecida em horários aleatórios, sendo registrados os deslocamentos horizontal e vertical (focal contínuo e os comportamentos de natação e exploração (focal instantâneo. Os deslocamentos horizontal e vertical dos camarões foram mais acentuados na fase escura, predominando o comportamento de natação. A exploração do substrato ocorreu em ambas fases, acentuando-se entre cinco e sete horas após o acendimento das luzes.Litopenaeus vannamei (Boone, 1931 daily behavior pattern is still poorly understood. With the aim of optimizing the management of shrimp farms through the study of this animal behavior, experiments were performed with juvenile (7.57 ± 1.01, which were marked and kept in aquariums (30 l. To record activity, the aquariums were submitted to an artificial photoperiod (light and dark phases, 12h:12 h, with 16 shrimp (33 m² monitored in each phase for 20 days, for 15-minute periods every hour. Food was provided at random times and a record kept of horizontal and vertical displacement (continuous focal, swimming and exploration behavior (instantaneous focal. The horizontal and vertical displacements of the shrimp were greater during the dark phase, with a predominance of the swimming behavior. Exploration of the substrate occurred in both phases, with a peak between five and seven hours after the lights were turned on.

  15. Life on the beach for a sand crab (Emerita rathbunae (Decapoda, Hippidae: parasite-induced mortality of females in populations of the Pacific sand crab caused by Microphallus nicolli (Microphallidae

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    Juan Violante-González

    2016-09-01

    Full Text Available Parasites, by definition, can affect mortality of their host, making parasitism an important biotic determinant of animal population dynamics and community structure. Reduction in the number of larger, reproductive age females in populations of the Pacific sand crab, Emerita rathbunae (Decapoda, Hippidae, was observed in studies of the helminth community of this host. The aim of this study was to determine if high abundance of the metacercaria of the trematode, Microphallus nicolli (Microphallidae, causes mortality in this host. Females of E. rathbunae were collected from four sandy beaches in Guerrero State, Mexico, and helminths were collected from each crab. An analysis of variance (Anova was applied to these data in order to identify differences in abundance between sizes of crabs, and an analysis of covariance (Ancova was applied to identify differences in the abundance of metacercariae between locations. Parasite-related mortality was inferred by a decrease in abundance in older hosts. Linear and polynomial regressions of mean abundance of helminths (log x+1 transformed data vs. cephalothorax length of crabs were significant for the four populations of E. rathbunae, indicating increased mortality of older, more heavily infected female crabs and resultant removal from the population. Encapsulation and melanization of cysts by crabs was observed, indicating that an immune response by crabs also killed a portion of the cysts from subsequent exposures. Mortality of hosts through behavioral modification favoring transmission of highly infected crabs was suggested as the driving force behind this process.

  16. Distribución espacial y temporal del cangrejo Callinectes sapidus (Decapoda: Portunidae en la Bahía de Chetumal, Quintana Roo, México

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    Héctor J Ortiz-León

    2007-03-01

    sapidus (Decapoda: Portunidae in Chetumal Bay, Quintana Roo, Mexico. In order to determine temporal and spatial distribution patterns of Callinectes sapidus, samplings were carried out during the cold-front (January-February, dry (May-June and rainy (August-September, 2002 climatic seasons, in 30 sampling stations of Chetumal Bay, grouped in sectors A (14 stations, B (eight stations and C (eight stations. In each sampling station crabs were collected from two transects parallel to the coast, each with three traps, separated by 30 m. Sediments were calcareous coarse and medium sand, white or lightly gray. A total of 1 031 specimens were collected. CPEU (Capture Per Effort Unit differed spatially and temporally. Highest CPEU was found in sector C with 1.3 ind∙trap-1, and in the rainy season with 1.1 ind∙trap-1. Population was predominantly composed of male individuals. The male:female ratio was 15:1. Males and adults (group II CPEU was significant different between sectors and climatic seasons. Both males and adults (group II had a greater CPEU in sector C (1.2 ind∙trap-1 and in the rainy season (1.1 ind∙trap-1. Abundance of female and juvenile individuals (group I was low during the sampling period whereas group 0 juvenile individuals were not found. A greater relative frequency between sectors and climatic seasons were observed in 130-139 mm and 140-149 mm size interval (CW. C. sapidus occurred on sandy sediments in Chetumal Bay. Pearson product moment correlations exhibited significant relationships between CPEU and temperature, salinity and dissolved oxygen. In Chetumal Bay, the spatial and temporal distribution of C. sapidus can be related to salinity, temperature, habitat quality, food availability, recruitment and reproduction events of individuals. Rev. Biol. Trop. 55 (1: 235-245. Epub 2007 March. 31.

  17. Zoological notes from port Dickson : III. Crustacea Anomura and Brachyura

    NARCIS (Netherlands)

    Buitendijk, A.M.

    1947-01-01

    From his stay at Port Dickson on the Malay Peninsula at the beginning of 1946 Major Dr. L. D. Brongersma of the N I C A Detachment brought home several species of crabs. A list of this material which is now incorporated in the collections of the Museum of Natural History at Leiden is given below, wh

  18. Significance of the sexual openings and supplementary structures on the phylogeny of brachyuran crabs (Crustacea, Decapoda, Brachyura), with new nomina for higher-ranked podotreme taxa.

    Science.gov (United States)

    Guinot, Danièle; Tavares, Marcos; Castro, Peter

    2013-01-01

    it is lost in all other raninoid extant members. New evidence shows that the abdominal holding was an early occurrence for a brachyuran crab. The Raninoidea, sister to Palaeocorystoidea, is characterised by gymnopleurity, a condition that results from the lifting of the carapace and thus the exposure of several pleurites. The narrowing of the body and thoracic sternum, almost certainly associated with their burrowing behaviour, is a diagnostic feature of raninoid evolution, in contrast to the widening observed in the remaining Brachyura. The monophyly of Heterotremata is discussed. Although the correct assignment of the coxal male gonopore and sternal female gonopore (vulva) at the base of Decapoda and Eubrachyura, respectively, left no synapomorphies to support the Heterotremata, the group nevertheless should be regarded as the sister group to Thoracotremata. The controversial monophyly of Podotremata is discussed and arguments are presented against the suppression of this taxon. The distinction of Homoloidia from Dromioidia is argued, and a classification of Podotremata, which considers the fossil record whenever possible, is presented. The earliest brachyurans are re-examined, and a new interpretation of the phylogeny of several basal eubrachyuran groups (Dorippoidea, Inachoididae, Palicoidea, Retroplumoidea) is proposed. Stenorhynchus shares a number of characters with the Inachoididae that differentiate them from Inachidae, and also has some distinctive features that warrants its assignment to a separate inachoidid subfamily, Stenorhynchinae, which is resurrected. The concealment strategies among Brachyura are documented and discussed. Podotremes use carrying behaviour, often combined with burying and concealment under substrates, whereas living within a host, burying, and decoration are used by heterotremes, burrowing being essentially a thoracotreme strategy. (ABSTRACT TRUNCATED)

  19. Variaciones en la condición nutricional de langostas Panulirus argus (Decapoda: Palinuridae en la región este del Golfo de Batabanó, Cuba Variations of the nutritional condition of lobsters Panulirus argus (Decapoda: Palinuridae in Eastern region of the Gulf of Batabanó, Cuba

    Directory of Open Access Journals (Sweden)

    Alexander Lopeztegui Castillo

    2012-03-01

    Full Text Available En Cuba, la región del Golfo de Batabanó es la más importante zona de pesca de langosta debido a que de ella se extrae anualmente alrededor del 70% de la captura nacional. Con el objetivo de determinar variaciones espacio-temporales en la condición nutricional (K de langostas Panulirus argus del Golfo de Batabanó, Cuba, se calculó dicha condición mediante una relación pesolargo (K=Pt/Lt, para lo que se utilizaron ejemplares de cuatro zonas (uno, dos, cuatro y cinco del este del golfo, capturados en los años 1981 y 2010. Se encontró que en todos los casos analizados la condición nutricional fue significativamente mayor en machos que en hembras. Se detectaron variaciones significativas entre zonas en 1981 y 2010. También entre años el estado nutricional de las langostas presenta variaciones significativas, de manera que en 1981 (2.34±0.84g/mm fue mayor que en 2010 (1.96±0.49g/mm. Tanto las variaciones interzonales como las interanuales parecen estar relacionadas con variaciones reportadas en el tipo de fondo y la cobertura vegetal. Variaciones estacionales en la abundancia y distribución de organismos bentónicos que constituyen alimento para las langostas también podrían estar influyendo. Las diferencias entre sexos en cambio, se suponen consecuencia de la metodología utilizada y del dimorfismo sexual característico de esta especie, por cuanto otros métodos de estimación de K que no involucran mediciones morfométricas, no detectan estas diferencias.Variations of the nutritional condition of lobsters Panulirus argus (Decapoda: Palinuridae in Eastern region of the Gulf of Batabanó, Cuba. Nutritional condition can affect survival and growth rate of crustaceans, and this is mostly affected by habitat conditions. This study describes the space-temporary nutritional changes in this commercially important species. With this aim, the variations in the nutritional condition (K of lobsters from four zones (1, 2, 4 and 5 in the Gulf

  20. Decapod larvae dynamics on Berlengas Biosphere Reserve (UNESCO - Portugal

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    Lénia Da Fonseca Alexandre Rato

    2014-05-01

    Total decapoda abundance ranged from 0,06 ind.m-3 in May 2011 to 64,28ind.m-3 in August 2012, and significantly different between summer/winter and winter/spring months (P(perm≤0,05. The data obtained on this study revealed that Infraorders Brachyura, Anomura and Caridea are the most common. All three are significantly different between months (P(perm≤0,05 but not between sampling stations (P(perm>0,05. Brachyuran abundance was significantly affected by the Oceanograhic Conditions (P(perm≤0,05. Abundances were higher in spring and summer months, when Chlorophyl a values (mg.m-3, Temperature (ºC and Salinity (ppt were also higher. Decapoda community is directly affected by the surrounding environmental conditions in Berlengas Biosphere Reserve and abundance might also be related with specific larvae release throughout the year. Each sampling station was considered a replica from the study area. The ecological importance of Berlengas was also verified by the presence of non-frequent larvae of Achelata and Stomatopoda.

  1. 瓯江口海域夏、秋季口足目和十足目虾类分布特征%Distribution of Hoplocarida and Decapoda shrimps in Oujiang estuary, East China Sea

    Institute of Scientific and Technical Information of China (English)

    徐兆礼; 沈盎绿; 李新正

    2009-01-01

    采用2007年6月和9月瓯江口海域2个航次的渔业资源调查资料,研究瓯江口海域甲壳动物口足目(Hoplocarida)和十足目(Decapoda)中虾类的资源密度、种类组成和物种多样性等分布,探讨优势种、地形地貌、水团、温度和盐度等因素变化对这些分布的影响.结果表明,在2次拖网调查中,共鉴定口足目2种和虾类17种.口虾蛄(Oratosquilla oratoria)和哈氏仿对虾(Parapenaeopsis hardwickii)是6月的关键种,口虾蛄是9月的关键种.6月和9月2类优势甲壳动物平均质量密度分别为41.14 kg/km2和32.36 kg/km2,尾数密度为18.41×103ind/km2和10.66×103ind/km2.质量密度与尾数密度分布趋势一致,即调查水域东部高于西部,南部高于北部.6月,种问分布较均匀,物种数多,多样性指数值(H')较高;9月,在群岛外侧,由于口虾蛄在质量密度上形成单一优势种,导致质量多样性指数下降;但在尾数密度上,种间分布较均匀,尾数多样性指数值明显高于质量多样性指数值.无论是在6月还是9月,高密度区均出现在瓯江口洞头群岛外侧,特别是东南部受台湾暖流影响的海域.瓯江北口外的冲淡水水团是形成瓯江口北侧口足目和十足目虾类密度、种数和多样性低的重要原因.研究结果表明,瓯江冲淡水势力的季节变化是影响瓯江订海域口足目和虾类种类和多样性分布的主要水文因素.[中国水产科学,2009,16(1):104-112

  2. Biologia reprodutiva e ecologia de Aegla leptoaectyla Buckup & Rossi (Crustacea, Anomura, Aeglidae Biology and ecology of Aegla leptodactyla Buckup & Rossi (Crustacea, Anomura, Aeglidae

    Directory of Open Access Journals (Sweden)

    Clarissa Köhler Noro

    2002-12-01

    Full Text Available The crustaeeans of Aeglidae family oeeur in South America's fresh water enviranments, featuring as important links in the food chains. The present article has the intention to give an acount of the results from investigations made from April/2000 to July/2001 on the biological and ecological features of Aegla leptodactyla Buckup & Rossi, 1977, an endemic species from the headwaters of the Rio Pelotas Basin in Rio Grande do Sul State, Brazil. The sampling was performed at the Rio da Divisa, tributary of Rio Pelotas, municipal district of São José dos Ausentes, Rio Grande do Sul. The animais were collected with a hand net (puçá at four different sites of the river. High contents of dissolved oxygen was verified, with a medium value of 108% and alow conductivity (avarage of 13.7mS/cm. The water mean temperature was 16ºC and the pH remained neutral, average of 7.5. The velocity of the water current varied from 0.54 to 0.78m/s. A total of 1,323 males and 1,112 females of A. leptodactyla was sampled. Ovigerous females were observed from April through September and the smallest egg bearing female measured 14.09 mm cephalothorax length. The recruitment took place in November and December. The sex-ratio of the population was 1.19 males for 1 female.

  3. Morfologia externa de Parastacus brasiliensis (Decapoda, Parastacidae

    Directory of Open Access Journals (Sweden)

    Ana Cristina M. Horn

    2008-03-01

    Full Text Available Parastacus brasiliensis (von Martens, 1869 é um lagostim de água doce endêmico da região meridional brasileira, ocorrendo nas bacias que formam o estuário do Guaíba, na depressão central do Estado do Rio Grande do Sul. O objetivo deste estudo é descrever e ilustrar a morfologia externa e a distribuição dos diferentes tipos de setas nos apêndices de exemplares adultos de P. brasiliensis. Em laboratório, os exemplares foram dissecados e detalhes da organização morfológica foram descritos e ilustrados com auxílio de câmara clara adaptada ao estereomicroscópio. Microscopia eletrônica de varredura foi utilizada para um melhor detalhamento no estudo das setas. Os resultados obtidos foram comparados com outras espécies de lagostins e com estágios juvenis de P. brasiliensis. Os tipos de setas e o padrão de distribuição observados são similares ao encontrado em Austropotamobius pallipes (Lereboullet, 1858. Diferenças foram encontradas no basipodito e no coxopodito do primeiro maxilípodo e na primeira maxila de P. brasiliensis, onde setas serradas são substituídas por formas plumodenticuladas e multidenticuladas.

  4. Species Composition, Temporal and Spatial Distributions and Diversity of Hoplocarida and Decapoda Shrimps in Summer and Winter in Sanmen Bay%三门湾海域冬夏季口足目和十足目虾类的种类组成、时空分布及多样性分析

    Institute of Scientific and Technical Information of China (English)

    赵蒙蒙; 徐兆礼

    2011-01-01

    Based on the data from two oceanographic survey in the Sanmen bay during Dec. 2007 and Jun. 2008,this paper discussed the population density of Hoplocarida and Decapoda shrimps in winter and summer, species dominancy and diversity, involved in some impact factors such as background of topography and geomorphy, as well as hydrological features. Results showed that eurythermal and eurysaline shrimp species prevailed in Sanmen Bay. Shrimp specie number in summer was higher than the one in winter, as well as the weight and number densities, which were 93.32 kg/km2and 31.97 kg/km2 ,32.34 × 103 ind/km2 and 19.32× 103ind/km2respectively. Parapenaeopsis tenella was the most important shrimp species in winter and Oratosquilla oratoria in summer according to index of relative significance (IRI). The species component in summer was more homogeneous than it in winter, so the weight and diversity index H'in winter( 1.58, 1.33 ) were both lower than those in summer( 1.78, 2. 18). The water temperature outside the bay mouth is relatively higher in winter so more shrimp species are found here. While in summer, the bay mouth is the intersection by waters with different salinities, therefore shrimp species is rich. In addition, the Decapoda shrimp species in Sanmen Bay reach 25.00% to the total shrimp species in Zhejiang offshore, which means specie richness in bay is much lower comparing with that in Zhejiang offshore.%根据2007年12月和2008年6月三门湾海域的2个航次的渔业资源调查资料,研究三门湾海域口足目与十足目中虾类在冬季和夏季的密度、优势种及多样性的时空分布,并结合该调查海区的地形地貌和水文等因素对虾类的分布进行分析.结果表明,三门湾海域虾类以广温、广盐种为主,其夏季种类数高于冬季,且夏季虾类质量和尾数密度均值亦高于冬季,夏季与冬季的虾类质量分别为93.32 kg/km2和31.97 kg/km2,而尾数密度分别为32.34×103ind/km2

  5. [Hermit crabs (Anomura: Paguroidea) distribution patterns in the Colombian Caribbean Sea].

    Science.gov (United States)

    Martínez Campos, Bibian; Hernando Campos, Néstor; Bermúdez Tobón, Adriana

    2012-03-01

    Hermit crabs represent the marine life in the Colombian Caribbean, and are important for the dynamic equilibrium maintenance in ecosystems, the ecological interactions and their impact on food web stability. Generally, in order to come up with some conservation strategies, strong bio-geographical information is needed for poll cies definition. With this aim, this study analyzed the distribution patterns of hermit crabs in the Colombian Caribbean Sea. through classification and spatial ordination multivariate analyses, using historical records from years 1916 to 2006. Besides, the world distribution of Colombian species and their geographic affinity in the Caribbean and Western Atlantic were identified. The results show deep differences between coastal and continental slope faunas, and latitudinal differences in the assemblages, with the identification of three groups: Northeast. Center and Southwest. The differences in faunal composition that support these three groups were determined. Based on maps of the Colombian marine ecosystems, it was found that the main factors affecting the distribution of hermit crabs were the Caribaná slope (depth), water-mass temperature, Guajira sea-grass beds, and particular conditions of "Coralline Archipelagos" and "Darién" eco-regions. Colombian hermit crab fauna is more related to the North Atlantic and the Antilles, than to the South Atlantic and the Gulf of Mexico. Additionally, geographical sub-provinces in which Colombia is included, these were found as transition zones among Northern and Austral subprovinces of the Greater Caribbean.

  6. A new hermit crab (Anomura, Paguroidea) from the upper Albian (Cretaceous) of Annopol, Poland.

    Science.gov (United States)

    Fraaije, René H B; Van Bakel, Barry W M; Jagt, John W M; Machalski, Marcin

    2015-05-06

    A new diogenid paguroid, Paguristes liwinskii sp. nov., is described from upper Albian phosphorite-bearing deposits near Annopol, along the east bank of the River Vistula (Wisła), east-central Poland. This new species constitutes an additional example of Early-Mid-Cretaceous macrofaunal shift, from marine reefal limestone to siliciclastic facies, triggered by the worldwide radiation of planktonic organisms. The species described here is the earliest known member of the genus Paguristes, previously recorded from the upper Santonian/lower Campanian to the Recent.

  7. Distribuição temporal do ermitão Clibanarius vittatus (Anomura, Diogenidae no litoral do Paraná Temporal distribution of the hermit crab Clibanarius vittatus (Anomura, Diogenidae from Paraná State coast, Brazil

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    Sara R. Sampaio

    2009-09-01

    Full Text Available Um estudo sobre a flutuação temporal da estrutura populacional do ermitão Clibanarius vittatus (Bosc, 1802 foi realizado no Baixio Mirim, Baía de Guaratuba, Estado do Paraná, Brasil (25°52'S, 48°36'W. Clibanarius vittatus é uma espécie largamente estudada, entretanto estudos da biologia populacional desta em diferentes regiões são escassos. Coletas mensais foram realizadas na zona entremarés, de abril/2005 a março/2006. Foram obtidos 1187 ermitões, dos quais, 949 machos, 22 indivíduos intersexo, 204 fêmeas não ovígeras e 12 fêmeas ovígeras. O comprimento do escudo cefalotorácico (CEC foi medido e agrupado em 10 classes de tamanho. Machos ocorreram em 10 classes de CEC, enquanto fêmeas e intersexos em apenas seis. A razão de sexos total e mensal foi a favor dos machos. Todas as categorias demográficas estiveram presentes o ano inteiro, com exceção dos intersexos e das fêmeas ovígeras. Estas foram pouco frequentes e ocorreram do final da primavera até o outono, e em agosto de 2005. O período reprodutivo foi considerado contínuo-sazonal, com maior intensidade nos meses mais quentes. A razão de sexos nesta população, que é diferente das demais estudadas, corrobora a teoria de migração proposta para esta espécie. O presente estudo constitui o primeiro registro do período reprodutivo desta espécie em águas rasas de clima subtropical quente.A study on the temporal fluctuation of the population structure of the hermit crab Clibanarius vittatus (Bosc, 1802 was carried out at Baixio Mirim tideflat, Guaratuba Bay, Paraná State, southern Brazil (25°52'S, 48°36'W. Clibanarius vittatus is a species widely studied, but studies of population biology of these hermit crabs in different regions are scarce. Samplings were done in the intertidal zone, monthly, from April/2005 to March/2006. A total of 1187 hermit crabs were obtained, among which, 949 males, 22 intersexes, 204 non-ovigerous females and 12 ovigerous females. The cephalothoracic shield length (CSL was measured and grouped in 10 size classes. Males were distributed in 10 CSL classes while intersexes and females occurred only in six size classes. Males predominated in every month and in the whole population. All demographic categories were present all year round, except intersexes and ovigerous females. These were uncommon and occurred from late spring until autumn and in august/2005. The reproduction was considered seasonal-continuous, with higher intensity in the warmer months. The observed sex ratio in this population, that was different from other ones, corroborates the theory of migration for this species. The present research constitutes the first record of reproductive period of C. vittatus population occurring in warm subtropical shallow waters.

  8. On some species of the genus Nephrops (Crustacea Decapoda)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1964-01-01

    The present note is based in the first place on the Nephropsid material collected by the Australian Fisheries Steamer "Endeavour" in the waters of South and East Australia, while also the West Indian Nephrops specimens in the collections of the U.S. National Museum, Washington, D.C., and the Rijksmu

  9. Cymonomid crabs of the MAINBAZA Expedition (Decapoda: Brachyura).

    Science.gov (United States)

    Ahyong, Shane T

    2014-06-23

    Cymonomid crabs collected from the Mozambique Channel off Madagascar by the 2011 MAINBAZA Expedition are reported. Two species of Cymonomus A. Milne Edwards, 1880, are represented, of which one is new to science and the other, C. valdiviae Lankester, 1903, is rediscovered, being previously known only from the holotype. Three species of Cymonomidae are now known from the western Indian Ocean, including C. trifurcus Stebbing, 1920, from South Africa. 

  10. The Crustacea Decapoda Macrura (the Alpheidae excepted) of Easter Island

    NARCIS (Netherlands)

    Holthuis, L.B.

    1972-01-01

    So far the Crustacean fauna of Easter Island has received but very little attention. In most early narratives of expeditions visiting the island no mention is made of any Crustacean. Behrens (1908: 135) who accompanied Jacob Roggeveen on the voyage during which, in 1722, the island was discovered,

  11. On some Indo-westpacific Palaemoninae (Crustacea Decapoda Caridae)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1952-01-01

    Since the publication of my paper on the prawns of the subfamily Palaemoninae collected by the Siboga and Snellius Expeditions (Holthuis, 1950, Siboga Exped., mon. 39a9), I had the opportunity to examine more material of this group, which enabled me to make additions and corrections to the above pap

  12. Foregut morphology of Macrobrachium carcinus (Crustacea, Decapoda, Palaemonidae)

    OpenAIRE

    LIMA, J.F.; GARCIA, J. da S.; Tavares, M.

    2016-01-01

    ABSTRACT Macrobrachium carcinus is a Brazilian native prawn with recognized potential for use in aquaculture activities. The aim of this study was to describe and illustrate in detail the morphology of the M. carcinus foregut. The foregut comprises the mouth, esophagus and stomach. It is lined by a simple cylindrical epithelium overlain by chitinous cuticle. The cardiac chamber is well supplied with muscles and lined with chitin thickened in places to form a complex, articulating set of ossic...

  13. First Zoeal Stage of Camptandrium sexdentatum (Crustacea: Decapoda: Camptandriidae

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    Park, Jay Hee

    2014-10-01

    Full Text Available The first zoea of Camptandrium sexdentatum is described for the first time with a digital image of live zoeas. An ovigerous crab of C. sexdentatum was collected at the muddy sand flat in Namhaedo Island on 2 June 2012 and hatched in the laboratory on 6 June 2012. In Camptandriidae, the first zoea of C. sexdentatum is distinguished from the first zoeas of Cleistostoma dilatatum and Deiratonotus cristatum by having no dorsal and lateral carapace spines, an abdomen significantly broadened posteriorly, and a subovoid telson without forks. Especially, the finding of a subovoid telson without forks is the first report in brachyuran zoeas.

  14. Review of Palaemoninae (Crustacea: Decapoda: Caridea) from Vietnam, Macrobrachium excepted

    NARCIS (Netherlands)

    Xuan, Van N.

    1992-01-01

    An account is presented of the species of Palaemoninae known from Vietnam, the genus Macrobrachium excluded. Of each species a description or descriptive notes are provided, and the habitat and economic importance are discussed. Illustrations of each species, two of which are new to science, are giv

  15. Estructura del aparato reproductor masculino de Uca uruguayensis (Decapoda, Ocypodidae)

    OpenAIRE

    Cuartas,Elena Irene; Petriella,Ana María

    2010-01-01

    The structure of the male reproductive tract was described in Uca uruguayensis Nobili, 1901, by using histological methods, scanning electron microscopy techniques, and stereoscopic observations of fresh material. The aim of this work was to establish the functional changes associated with sexual maturation. The morphology of the first (G1) and second (G2) pair of gonopods was described. The male reproductive tract consists of paired organs: testes, and tubular and convoluted vas deferens (VD...

  16. New species of Temnocephala Blanchard (Platyhelminthes, Temnocephalida ectosymbiont on Aegla serrana Buckup & Rossi (Crustacea, Anomura from southern Brazil

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    José Felipe Ribeiro Amato

    2003-09-01

    Full Text Available A new species of the genus Temnocephala Blanchard, 1849 is described from southern Brazil, ectosymbiont on Aegla serrana Buckup & Rossi, 1977, an anomuran crustacean, collected in a creek and a reservoir of the highlands in the State of Rio Grande do Sul. All crustaceans examined were positive for this species of Temnocephala and carried eggs in different regions of the ventral side: perioral area, pleural strips, esternal plates, pereiopods and chelipods; to a lesser extent in the dorsal side of the cephalothorax and dorsal side of the uropods; as well as adult and young specimens. The most distinctive characters of the new species are: 1 cyanophilous glands forming an irregular-shaped, grape-like, bunch of approximately 10-15 cells, deeply staining with hematoxylin; 2 shape and size of the cirrus and its introvert section; 3 number, size and distribution of the rhabdite glands and 4 shape and position of the post tentacular, 'excretory' syncytial plates, with the off-centered nephridiopore.

  17. Distribución de cangrejos ermitaños (Anomura: Paguroidea en el mar Caribe colombiano

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    Bibian Martínez Campos

    2012-03-01

    Full Text Available Los cangrejos ermitaños son un grupo representativo de la fauna marina del Caribe colombiano, además, son importantes en el mantenimiento del equilibrio dinámico, en los ecosistemas por sus interacciones ecológicas y también por el impacto en la estabilidad de las redes tróficas. Sus patrones de distribución se identificaron mediante análisis multivariados de clasificación y ordenación espacial, se usaron registros históricos desde 1916 hasta el 2006. Los resultados indican diferencias por profundidad entre la fauna costera y la del talud continental y diferencias en la distribución latitudinal, en donde se encontraron tres grupos: Noreste, Centro y Suroeste, sustentados por diferencias en la composición faunística. Con base en los mapas de ecosistemas marinos de Colombia, se determinó que los principales factores que afectan su distribución son la influencia del talud Caribaná (profundidad, la temperatura de las masas de agua, las praderas de pastos marinos de la Guajira y las condiciones particulares de las ecorregiones Archipiélagos coralinos y Darién. Se identificó la distribución mundial de las especies colombianas y su afinidad geográfica, y se encontró mayor afinidad con el Atlántico norte y las Antillas que con el Atlántico sur y el Golfo de México, asimismo, las subprovincias geográficas que incluyen a Colombia son zonas de transición dentro de la subprovincias septentrionales y australes del Gran Caribe

  18. Shape and size variations of Aegla uruguayana (Anomura, Aeglidae under laboratory conditions: A geometric morphometric approach to the growth

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    Valeria P. Diawol

    2015-03-01

    Full Text Available Crustacean growth studies typically use modal analysis rather than focusing on the growth of individuals. In the present work, we use geometric morphometrics to determine how organism shape and size varies during the life of the freshwater crab, Aegla uruguayana Schmitt, 1942. A total of 66 individuals from diverse life cycle stages were examined daily and each exuvia was recorded. Digital images of the dorsal region of the cephalothorax were obtained for each exuvia and were subsequently used to record landmark configurations. Moult increment and intermoult period were estimated for each crab. Differences in shape between crabs of different sizes (allometry and sexes (sexual dimorphism; SD were observed. Allometry was registered among specimens; however, SD was not statistically significant between crabs of a given size. The intermoult period increased as size increased, but the moult frequency was similar between the sexes. Regarding ontogeny, juveniles had short and blunt rostrum, robust forehead region, and narrow cephalothorax. Unlike juveniles crabs, adults presented a well-defined anterior and posterior cephalothorax region. The rostrum was long and stylised and the forehead narrow. Geometric morphometric methods were highly effective for the analysis of aeglid-individual- growth and avoided excessive handling of individuals through exuvia analysis.

  19. An unusual new species of paguroid (Crustacea, Anomura, Paguridae from deep waters of the Gulf of Mexico

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    Rafael Lemaitre

    2014-10-01

    Full Text Available A new hermit crab species of the family Paguridae, Tomopaguropsis ahkinpechensis sp. n., is described from deep waters (780–827 m of the Gulf of Mexico. This is the second species of Tomopaguropsis known from the western Atlantic, and the fifth worldwide. The new species is morphologically most similar to a species from Indonesia, T. crinita McLaughlin, 1997, the two having ocular peduncles that diminish in width distally, reduced corneas, dense cheliped setation, and males lacking paired pleopods 1. The calcified figs on the branchiostegite and anterodorsally on the posterior carapace, and the calcified first pleonal somite that is not fused to the last thoracic somite, are unusual paguroid characters. A discussion of the affinities and characters that define this new species is included, along with a key to all five species of Tomopaguropsis.

  20. An unusual new species of paguroid (Crustacea, Anomura, Paguridae) from deep waters of the Gulf of Mexico

    Science.gov (United States)

    Lemaitre, Rafael; Vázquez-Bader, Ana Rosa; Gracia, Adolfo

    2014-01-01

    Abstract A new hermit crab species of the family Paguridae, Tomopaguropsis ahkinpechensis sp. n., is described from deep waters (780–827 m) of the Gulf of Mexico. This is the second species of Tomopaguropsis known from the western Atlantic, and the fifth worldwide. The new species is morphologically most similar to a species from Indonesia, Tomopaguropsis crinita McLaughlin, 1997, the two having ocular peduncles that diminish in width distally, reduced corneas, dense cheliped setation, and males lacking paired pleopods 1. The calcified figs on the branchiostegite and anterodorsally on the posterior carapace, and the calcified first pleonal somite that is not fused to the last thoracic somite, are unusual paguroid characters. A discussion of the affinities and characters that define this new species is included, along with a key to all five species of Tomopaguropsis. PMID:25408613

  1. Shrimps from the Santana Group (Cretaceous: Albian: new species (Crustacea: Decapoda: Dendrobranchiata and new record (Crustacea: Decapoda: Caridea

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    ALLYSSON P. PINHEIRO

    2014-06-01

    Full Text Available The fossil shrimp Araripenaeus timidus n. gen. n. sp. is the first fossil Penaeoidea from Brazil. Here, we describe, illustrate and compare it with Paleomattea deliciosa, a fossil Sergestoidea (Dendrobranchiata previously described from the same region. The material of the early Cretaceous (Albian was collected in the town of Jardim, south of the state of Ceará, in the superior septarian concretion level of the Romualdo Formation. Additionally, a second specimen of Kellnerius jamacaruensis was found in the same site of the Araripe Basin.

  2. Shrimps from the Santana Group (Cretaceous: Albian): new species (Crustacea: Decapoda: Dendrobranchiata) and new record (Crustacea: Decapoda: Caridea).

    Science.gov (United States)

    Pinheiro, Allysson P; Saraiva, Antônio Áf; Santana, William

    2014-04-29

    The fossil shrimp Araripenaeus timidus n. gen. n. sp. is the first fossil Penaeoidea from Brazil. Here, we describe, illustrate and compare it with Paleomattea deliciosa, a fossil Sergestoidea (Dendrobranchiata) previously described from the same region. The material of the early Cretaceous (Albian) was collected in the town of Jardim, south of the state of Ceará, in the superior septarian concretion level of the Romualdo Formation. Additionally, a second specimen of Kellnerius jamacaruensis was found in the same site of the Araripe Basin.

  3. Morfologia setal de Parastacus brasiliensis (von Martens (Crustacea, Decapoda, Parastacidae Setae morphology of Parastacus brasiliensis (von Martens (Crustacea, Decapoda, Parastacidae

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    Ana Cristina Moura Horn

    2004-12-01

    Full Text Available A familia Parastacidae compreende os crustáceos límnicos popularmente conhecidos como lagostins da água doce. Parastacus Huxley, 1879 é o único gênero que ocorre no Brasil, e inclui, no estado do Rio Grande do Sul, a espécie endêmica, Parastacus brasiliensis (von Martens, 1869. Os espécimes foram coletados com armadilhas em um arroio nas cabeceiras da bacia do Rio Gravataí, município de Taquara, Rio Grande do Sul, Brasil. Os animais capturados foram transportados até o Laboratório de Crustáceos Universidade Federal do Rio Grande do Sul e criados em aquários até atingirem o estado adulto. Os espécimes foram dissecados e suas estruturas examinadas por microscopia óptica e desenhados em câmara clara. O material foi ainda preparado para fotografia sob exame com microscópio eletrônico de varredura. Procedeu-se à análise e classificação de todos tipos de setas encontradas nas formas adultas de P. brasilieinsis.The family Parastacidae comprises the limnic crustaceans popularly known as crayfishes or crawfishes. Parastacus Huxley, 1879 is the only genus occurring in Brazil and has an endemic species, Parastacus brasiliensis (von Martens,1869, in Rio Grande do Sul State. The individuals were collected with traps from a brook in the springs of Gravataí basin, Taquara, Rio Grande do Sul State, Brazil. The captured animals were taken to the Universidade Federal do Rio Grande do Sul Carcinology Laboratory and raised to full growth in aquaria. The specimens were dissected, and the setae analysed under optical microscopy and drawn with the aid of a camera lucida. Material was prepared for photography under scanning electron microscope. The analysis and classification of all types of setae in the adult forms of P. brasilieinsis was performed.

  4. Insights into life-history traits of Munidopsis spp. (Anomura: Munidopsidae) from hydrothermal vent fields in the Okinawa Trough, in comparison with the existing data

    Science.gov (United States)

    Nakamura, Masako; Chen, Chong; Mitarai, Satoshi

    2015-06-01

    Squat lobsters in the genus Munidopsis are commonly found at, and near, hydrothermal vents. However, the reproductive traits of most Munidopsis spp. are unknown. This study examined the reproductive features of two Munidopsis species sampled from hydrothermal vent fields in the southern Okinawa Trough in February 2014. Three ovigerous females were collected: two Munidopsis ryukyuensis at Irabu Knoll (1661-1675 m depth) and one M. longispinosa at Hatoma Knoll (1482 m depth). Carapace sizes and egg volumes were measured and compared with those of other Munidopsis species. The ovigerous M. ryukyuensis specimens had postorbital carapace lengths of 10.3 and 11.8 mm, without the rostrum, and carapace widths of 8.6 and 9.7 mm. Mean egg volumes of M. ryukyuensis and M. longispinosa were ~4 mm3. These results are consistent with early sexual maturity in M. ryukyuensis and lecithotrophic development in both species, as described in other species of the genus. These life-history traits may enable these vent species to maximize their reproductive and dispersive potential.

  5. Growth of the hermit crab Clibanarius vittatus (Bosc, 1802 (Crustacea, Anomura, Diogenidae at São Vicente, São Paulo, Brazil

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    Bruno Sampaio Sant’Anna

    2008-06-01

    Full Text Available The present study analyzed the growth of males and females of the hermit crab Clibanarius vittatus (Bosc, 1802, at São Vicente, São Paulo, Brazil. Monthly collections were made from May/2001 through April/2003, at the Pescadores Beach in São Vicente. The 2,501 crabs caught were identified and sexed and the carapace shield length (CSL was measured. For the seasonal growth study, the population was divided into 5mm size classes (CSL and analyzed by the Bertalanffy method, with the aid of the program Fisat II. The mean sizes of the 703 males and 1,798 females were 8.94±1.80 and 6.61±1.13 mm, respectively. A seasonal growth pattern was observed, with males reaching an asymptotic size (14.92 mm larger than that of females (13.85 mm. Males began the growth process approximately five months before the females. This growth pattern probably helped to reduce intraspecific competition for the shells, because the males reached larger size and made the smaller shells available to the females.O presente estudo teve como objetivo analisar o crescimento de machos e fêmeas do ermitão Clibanarius vittatus (Bosc, 1802, da região de São Vicente, São Paulo, Brasil. Foram realizadas coletas mensais de maio/2001 a abril/2003, na Praia dos Pescadores em São Vicente. Os 2.501 animais capturados foram identificados, determinados quanto ao sexo e mensurados quanto ao seu comprimento de escudo cefalotorácico (CEC. Para o estudo sazonal do crescimento, a população foi dividida em classes de tamanho de 5mm de (CEC, e analisada pelo método de Bertalanffy, com o auxílio do software Fisat II. Foram obtidos 703 indivíduos machos e 1.798 fêmeas, com média de tamanho de 8.94±1.80 e 6.61±1.13mm, respectivamente. Constatou-se um padrão de crescimento sazonal, com machos atingindo um tamanho assintótico (14.92mm superior ao das fêmeas (13.85mm, além de iniciarem o processo de crescimento aproximadamente cinco meses antes destas. Desta forma, é provável que este seja um padrão que auxilia na diminuição da disputa intra-específica por conchas, uma vez que os machos atingiram maior tamanho e estariam disponibilizando conchas menores para as fêmeas.

  6. A new species of hermit crab of the genus Pagurus Fabricius, 1775 (Crustacea: Anomura: Paguridae) from the southern Caribbean off Venezuela.

    Science.gov (United States)

    Lima, Daniel José Marcondes; Lemaitre, Rafael

    2016-09-06

    A male specimen of a new species of the heterogeneous genus Pagurus Fabricius, 1775, collected in 1968 off the Caribbean coast of Venezuela, was discovered among the vast crustacean collections of the Smithsonian Institution. This new species herein described and illustrated is named P. scopaopsis, and is characterized primarily by the presence of: a brush-like setation pattern on the dactyl of the left third pereopod, dense small tubercles on the dorsal surfaces of the dactyl and fixed finger of the right chela, and a raised longitudinal ridge armed with spines on the palm and fixed finger of the left chela.

  7. The anatomy of the king crab Hapalogaster mertensii Brandt, 1850 (Anomura: Paguroidea: Hapalogastridae): new insights into the evolutionary transformation of hermit crabs into king crabs

    NARCIS (Netherlands)

    Keiler, J.; Richter, S.; Wirkner, C.S.

    2015-01-01

    The emergence of king crabs from a hermit crab-like ancestor is one of the most curious events in decapod evolution. King crabs comprise two taxa, Lithodidae and Hapalogastridae, and while lithodids have formed the focus of various anatomical studies, the internal anatomy of hapalogastrids has never

  8. New species and records of the genus Aegla Leach, 1820 (Crustacea, Anomura, Aeglidae from the West-Central region of Rio Grande do Sul, Brazil

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    Sandro Santos

    Full Text Available Aeglidae are anomuran freshwater "crabs" found only in southern South America. In Brazil, the greatest species diversity occurs in hydrographic basins of the state of Rio Grande do Sul. Two new species, Aegla georginae and Aegla ludwigi, are described from the Ibicuí and Ijuí Rivers, respectively (Uruguay River Basin. The new taxa can be distinguished from other Aegla species based on both morphological and molecular characters. The two new species have a very restricted distribution and are categorized as endangered (A. georginae and critically endangered (A. ludwigi using IUCN Red List criteria. We also summarize and present new records of the Aegla species occurring in the Uruguay River Basin.

  9. Uma armadilha para captura de Porcellanidae (Crustacea, Decapoda do mediolitoral de praias rochosas A trap for capturing porcellanidae (Crustacea, Decapoda from midlittoral of rocky shores

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    Edinalva Oliveira

    1995-01-01

    Full Text Available A simple net trap for capturing agile porcelain crabs living amongst superposed stones of the midlittoral rocky shore was developed. About a hundred pebbles and boulders were dislodged from I m² area and Im depth, so that a pit was formed. A sheet net of Im² and Imm mesh size was spread on the bottom of this pit and the stones were replaced again, like the original condition. After a cicle of high tide (about 12 hours, the same stones in the pit were carefully searched by dislodging and by rinsing them. The porcelain crabs were slowly getting out from the handling stones towards the bottom until they found the net sheet. The net border was lifted and the animais captured. The density of population sampled with the aid of the net trap was about 50% higher than that collected by hand. Also, small size species and early developmental stages were adequately collected in this trap. However, the sampling by hand also showed a good performance, as all species of Porcellanidae known from Farol isle and all developmental stages of those species were registered in this collection methodology.

  10. Notes on a collection of Crustacea Decapoda from the Great Bitter Lake, Egypt, with a list of the species of Decapoda known from the Suez Canal

    NARCIS (Netherlands)

    Holthuis, L.B.

    1956-01-01

    Between August 18 and September 5, 1950, Dr. C. Beets, geologist Royal Dutch Shell Oil Company, explored the aquatic fauna and flora of the Great Bitter Lake. In the course of this exploration dredge hauls were made at 47 stations, distributed all over the lake. An account of this work and a

  11. Estructura del aparato reproductor masculino de Uca uruguayensis (Decapoda, Ocypodidae) Structure of the male reproductive tract of Uca uruguayensis (Decapoda, Ocypodidae)

    National Research Council Canada - National Science Library

    Elena Irene Cuartas; Ana María Petriella

    El objetivo de este trabajo es describir las estructuras del sistema reproductor de machos de Uca uruguayensis Nobili, 1901 y estudiar los cambios relacionados con la madurez sexual. Se trabajó con observación...

  12. Estructura del aparato reproductor masculino de Uca uruguayensis (Decapoda, Ocypodidae Structure of the male reproductive tract of Uca uruguayensis (Decapoda, Ocypodidae

    Directory of Open Access Journals (Sweden)

    Elena Irene Cuartas

    Full Text Available El objetivo de este trabajo es describir las estructuras del sistema reproductor de machos de Uca uruguayensis Nobili, 1901 y estudiar los cambios relacionados con la madurez sexual. Se trabajó con observación estereoscópica de material fresco, técnica histológica de rutina y observaciones en Microscopio Electrónico de Barrido. Se incluyó la caracterización de los gonopodos 1 (G1 y 2 (G2. El tracto reproductor del macho se compone de un par de testículos (T, un vaso deferente (VD tubular y sinuoso y una ampolla terminal (AT. El VD tiene tres secciones, la anterior (VDA, la media (VDM y la posterior (VDP. El VDA y VDM están conformadas por un epitelio simple de células cúbicas. El epitelio del VDP es columnar y con núcleos basales y alongados. El diseño tubular se modifica al ocuparse el lumen del VDP con líquido espermático durante el verano y la musculatura circular se hace más evidente. La porción terminal del VDP se ensancha formando una ampolla (AT que comprende cuatro cámaras interconectadas. Todas las estructuras están rodeadas de una capa de tejido conectivo de poco espesor. Se identifican las modificaciones observadas en la histología de T y VD, definiendo como mas relevantes las observadas desde el mes de noviembre hasta marzo. Estas modificaciones sugieren que U. uruguayensis tiene, en la localidad estudiada, una única estación reproductiva durante el verano en esta latitud. La AT, tal como es descripta, es una estructura que hasta el momento no ha sido mencionada para los Brachyura.The structure of the male reproductive tract was described in Uca uruguayensis Nobili, 1901, by using histological methods, scanning electron microscopy techniques, and stereoscopic observations of fresh material. The aim of this work was to establish the functional changes associated with sexual maturation. The morphology of the first (G1 and second (G2 pair of gonopods was described. The male reproductive tract consists of paired organs: testes, and tubular and convoluted vas deferens (VD ending with a terminal ampoule (TA.The (VD is composed of three parts: anterior (AVD, medial (MVD and posterior (PVD. The AVD and MVD are lined by a single layer of cubical cells. The PVD epithelial cells are columnar with elongated nuclei. The terminal ampoule comprises four interconnecting chambers and is externally surrounded by connective tissue. The study of testes and vas deferens at different times along the year suggests that U. uruguayensis has a single and continuous reproductive season from December to March. The TA has not been described in other brachyurans and this structure is novel to Brachyura.

  13. Crescimento relativo em Uca leptodactyla Rathbun (Crustacea Decapoda Ocypodidae Relative growth in the fiddler crab Uca leptodactyla Rathbun (Crustacea Decapoda Ocypodidae

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    Setuko Masunari

    2003-09-01

    Full Text Available Relative growth of the male major chela and female abdome was studied in a population of the fiddler crab Uca leptodactyla Rathbun, 1898 from Itapoá, Santa Catarina coast, southern Brazil. Major chela length (CMQ was measured from 191 males, and abdomen width (LAB from 128 females. Carapace width (LC was the reference dimension for both sexes, which ranged from 3.9 to 11.5 mm for males, and from 3.15 to 10.65 mm for females. Males grew bigger than females. Relationship between CMQ and LC showed a transition point at 8.35 mm LC in males, and between LA and LC at 7.10 mm LC in females. Growth was allometrically positive in the early ontogenesis and isometric after the puberal molting for both sexes. Regressions between LC and CMQ in males read as: logCMQ = -0,854536 + 2,19. logLC for empirical points at left of critical point and logCMQ = 0,063047 + 1,24. logLC for those at right. In females, this relation was logLAB = -0,603590 + 1,30. logLC and logLAB = -0,361464 + 1,07. logLC, respectively. These body dimensions were connected with reproductive activity of this species.

  14. Palaemonidae (Crustacea: Decapoda: Caridea from the shallow waters from Quintana Roo, Mexican Caribbean coast Palaemonidae (Crustacea: Decapoda: Caridea de las aguas someras de Quintana Roo, Caribe mexicano

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    Ramiro Román-Contreras

    2010-04-01

    Full Text Available Few studies have focused on the palaemonid fauna of the Mexican Caribbean. This study provides a list of shallow water free-living and symbiont shrimps of the family Palaemonidae collected on turtle grass (Thalassia testudinum in Bahía de la Ascensión, Bahía del Espíritu Santo and Mahahual reef lagoon, Quintana Roo, Mexico. Ten species in 8 genera are reported, of which the genus Periclimenes is the most diverse with 3 species. An updated geographic distribution along the western Atlantic and other regions is provided for all the species. The greatest affinity of the palaemonid fauna studied, besides that with the Caribbean province, is with the Brazilian, Argentinian, and Texan zoogeographic provinces. Of the 10 species reported in this paper, 8 represent new local records in the studied area.Los crustáceos de la familia Palaemonidae del Caribe mexicano han sido poco estudiados. En este trabajo se presenta un listado de palemónidos de vida libre y simbiontes recolectados en el pasto marino Thalassia testudiuim de Bahía de la Ascensión, Bahía del Espíritu Santo y la laguna arrecifal de Mahahual, Quintana Roo, México. Se registran 10 especies pertenecientes a 8 géneros, siendo el género Periclimenes el más diverso con 3 especies. Para todas las especies se proporciona su distribución geográfica en la costa del Atlántico americano así como en otras regiones. Además de la provincia Caribeña, los palemónidos recolectados también muestran alta afinidad con otras provincias zoogeográficas como la Brasileña, Argentina y Texana; de las 10 especies registradas en este estudio, 8 representan nuevo registro local en el área estudiada.

  15. Notes on a collection of Crustacea Decapoda from the Great Bitter Lake, Egypt, with a list of the species of Decapoda known from the Suez Canal

    NARCIS (Netherlands)

    Holthuis, L.B.

    1956-01-01

    Between August 18 and September 5, 1950, Dr. C. Beets, geologist Royal Dutch Shell Oil Company, explored the aquatic fauna and flora of the Great Bitter Lake. In the course of this exploration dredge hauls were made at 47 stations, distributed all over the lake. An account of this work and a descrip

  16. Crustacean fauna (Stomatopoda: Decapoda) associated with the deepwater fishery of Heterocarpus vicarius (Decapoda: Pandalidae) along the Pacific coast of Costa Rica

    OpenAIRE

    S. Wehrtmann - Silvia Echeverría-Sáenz, Ingo

    2005-01-01

    Commercial bottom trawling is a successful and commonly used method to catch marine shrimps. However, the shrimp fishing gears are poorly selective, and in addition to the target species they catch and retain large quantities of non-target species (bycatch). This study presents data concerning species composition and depth distribution of the crustacean fauna (stomatopods and decapods) associated with Heterocarpus vicarius catches from Pacific Costa Rica. A total of 74 samples (three to five ...

  17. The larval development of Pinnixa gracilipes Coelho (Decapoda, Pinnotheridae reared in the laboratory O desenvolvimento larval de Pinnixa gracilipes Coelho (Decapoda, Pinnotheridae cultivado em laboratório

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    Jô de F. Lima

    2006-06-01

    Full Text Available Pinnixa gracilipes Coelho, 1997 is a small pinnotherid crab living in association with ghost shrimp Lepidophthalmus siriboia Felder & Rodrigues, 1993 in the northeastern region of Pará State, Brazil. Larvae of P. gracilipes were reared in the laboratory from hatching to the megalopa stage. The complete zoeal period averaged 24 days. Mean duration for each larval stage was 5, 4, 4, 5 and 6 days, respectively. In the present study, five zoeal and megalopal stages are described and illustrated in detail. Morphological comparisons with previous reported works on Pinnotheridae larvae are briefly discussed.Pinnixa gracilipes Coelho, 1997 é um pequeno caranguejo pinoterídeo que vive em associação com Lepidophthalmus siriboia Felder & Rodrigues, 1993 no nordeste do Estado do Pará, Brasil. Larvas de P. gracilipes foram cultivadas em laboratório desde o nascimento ao estágio megalopa. O desenvolvimento completo durou cerca de 24 dias. O per��odo médio de cada estágio foi 5, 4, 4, 5 e 6 dias, respectivamente. No presente trabalho, os cinco estágios zoeae e megalopa são descritos e ilustrados em detalhes. Comparações morfológicas com estudos anteriores sobre larvas da família Pinnotheridae são brevemente discutidas.

  18. Estrutura populacional e biologia reprodutiva de Parastacus defossus (Crustacea: Decapoda: Parastacidae Population structure and reproductive biology of Parastacus defossus (Crustacea: Decapoda: Parastacidae

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    Clarissa K. Noro

    2008-12-01

    Full Text Available Este trabalho descreve a estrutura populacional e aspectos da biologia reprodutiva de Parastacus defossus Faxon, 1898, uma espécie com hábito fossorial que passa sua vida no interior de galerias subterrâneas. Aproximadamente 30 exemplares foram coletados mensalmente, de janeiro de 2003 a agosto de 2005 na região do Lami, Município de Porto Alegre, Rio Grande do Sul, Brasil. Registrou-se o comprimento mínimo, máximo e médio da carapaça de machos, fêmeas, juvenis e animais com ootestículo. Analisou-se a distribuição de freqüência por classes de tamanho, a proporção sexual, o recrutamento e o período reprodutivo. Foram amostrados um total de 766 exemplares, 315 machos (41,12%, 278 fêmeas (36,30%, 166 juvenis (21,67% e sete animais com ootestículo (0,91%. Machos e fêmeas estiveram presentes durante todos os meses de amostragem e em todas as classes de tamanho, sendo que a maior freqüência de indivíduos foi registrada nas classes de tamanho ente 24 a 30 mm. A maior freqüência de juvenis foi observada na primavera/2003 e verão/2005. Diferenças significativas no tamanho de machos e fêmeas foram registradas apenas nas classes de tamanho entre 26-30 mm. A proporção sexual no período amostral foi de 1:0,88 (x² = 2,3; p > 0,05 e entre as classes de tamanho foram constatadas diferenças significativas nas classes de tamanho 26-28 mm (x² = 5,43; p This study investigates the population structure and the reproductive biology of Parastacus defossus Faxon, 1898, a fossorial species that spends its life inside subterranean tunnels. Around 30 specimens were collected each month in the region of Lami, municipality of Porto Alegre, state of Rio Grande do Sul, Brazil, from January, 2003 to August, 2005. The minimum, the maximum, and the mean carapace length of males, females, juveniles and individuals with ootestis were recorded. The frequency distribution by size classes, the sexual proportion, the recruitment, and the reproductive period were analyzed. A total of 766 specimens were collected, from which 315 were males (41.12%, 278 were females (36.30%, 166 were juveniles (21.67%, and seven individuals had ootestis (0.91%. Males and females were present in all months and in all size classes. The highest frequency of individuals matched the size classes from 24 to 30 mm. The highest frequency of juveniles was recorded during the spring of 2003 and the summer 2005. Significant differences in the size of males and females were recorded in the size classes between 26 and 30 mm. The sex ratio between all males and females was 1:0.88 (x² = 2.3, p > 0.05. The proportion between males and females showed significant differences between the size classes 26-28 mm (x² = 5.43, p < 0.05 and 28-30 mm (x² = 4.77, p < 0.05 carapace length, were the number of males was highest. Of the 278 females, only 17 were ovigerous (6.11% and the reproductive period was clearly restricted to the spring.

  19. Dinâmica populacional de Aegla platensis Schmitt (Crustácea, Decapoda, Aeglidae Population's dynaniics of Aegla platensis Schmitt (Crustácea, Decapoda, Aeglidae

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    Alessandra Angélica de Pádua Bueno

    2000-03-01

    Full Text Available The crustaceans of the genus Aegla Leach, 1820, are found in streams, rivers of caves, current rivers and lagoons, from Franca, São Paulo, Brazil (20º60'S, 47º40'W, to Ilha Madre de Dios (5uº01'10"S, 75º18'45"W, Chile in South America. The crabs (Aegla plalensis Schmitt, 1942 were monthly sampled by hand fromjuly 1997 to september 1998 in Arroio do Mineiro, Taquara (29º46'S, 50º53'W, Rio Grande do Sul, Brazil. The sex, the length and width of the carapace were registered. After being collected the animais were returned to the stream. The repro-ductive period, the size at the first maturation and the sex-ratio were identifred. The reproductive period of A. platensis lasts the whole year. The percentage of ovigerous females is higher in july. The size at the first maturation is from 14,40 to 15,60 mm of carapace length. The sex-ratio is 1,08 male to 1 female. The annual population's density is 12 animais per square meter.

  20. Shell utilization pattern of the hermit crab Clibanarius vittatus (Crustacea, Anomura in an estuary at São Vicente, State of São Paulo, Brazil Padrão de utilização de conchas do ermitão Clibanarius vittatus (Crustacea, Anomura, no Estuário de São Vicente, Estado de São Paulo, Brasil

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    Bruno S. Sant'Anna

    2006-06-01

    Full Text Available We evaluated the gastropod shell utilization pattern of the hermit crab Clibanarius vittatus (Bosc, 1802 at Pescadores Beach in São Vicente, State of São Paulo, Brazil. Specimens were collected monthly from May 2001 through April 2003, in the intertidal zone at low tide. The crabs were weighed and their carapace shield length measured. All gastropod shells were identified and had their shell biometric parameters (total length and aperture length measured (mm and weighed (g. A total of 2,344 hermit crabs (644 males, 1,594 females, 45 ovigerous females and 61 individuals in intersex, using 13 species of gastropod shells, were collected. Stramonita haemastoma (Linnaeus, 1767, Cymatium parthenopeum (Von Salis, 1793 and Achatina fulica (Bowdich, 1822 comprised over 98% of all the shells. Male and intersex crabs were significantly larger than the females. This size difference strongly influenced the shell utilization pattern, principally in A. fulica, which has the largest shell size, that was only used by males and intersexual individuals of C. vittatus. Cymatium parthenopeum was the only shell species that showed a high determinant coefficient in all the biometric correlations evaluated. The high abundance of S. haemastoma shells and a strong correlation between crab size and shell aperture length established by a significant determination coefficient, indicated that C. vittatus uses this species as the principal resource for shell occupation at Pescadores Beach.O objetivo do presente estudo foi avaliar a utilização de conchas de gastrópodes por Clibanarius vittatus (Bosc, 1802, na Praia dos Pescadores, em São Vicente (SP, Brasil. Foram realizadas amostras mensais no período de maio de 2001 a abril de 2003, na região intertidal durante a maré baixa. Todos os animais foram pesados e tiveram o comprimento de seu escudo cefalotorácico mensurados, suas conchas identificadas e medidas quanto ao comprimento (mm, abertura (mm e peso (g. Capturamos 2.344 ermitões (644 machos, 1.594 fêmeas não-ovígeras, 45 fêmeas ovígeras e 61 em intersexo, utilizando 13 espécies de conchas de gastrópodes, das quais Stramonita haemastoma (Linnaeus, 1767, Cymatium parthenopeum (Von Salis, 1793 e Achatina fulica (Bowdich, 1822 representaram mais de 98% das conchas utilizadas. Obteve-se significativa diferença de tamanho entre os sexos, com machos e indivíduos em intersexo atingindo maior porte físico do que fêmeas. Este padrão influenciou fortemente na ocupação e utilização de conchas, principalmente em A. fulica, que foi a maior concha obtida por C. vittatus, utilizada somente por machos e indivíduos em intersexo. Cymatium parthenopeum foi a única espécie de concha em que se obtiveram elevados coeficientes de determinação para todas os parâmetros analisados. Stramonita haemastoma apresentou elevados e significativos coeficientes de determinação, indicando que esta espécie é o principal recurso de concha ocupada na Praia dos Pescadores.

  1. Indução do crescimento ovariano em Aegla uruguayana (Crustacea, Anomura, Aeglidae mediante a incorporação de neuroreguladores ao alimento Induction of ovarian growth in Aegla uruguayana (Anomura, Aeglidae by means of neuroregulators incorporated to food

    Directory of Open Access Journals (Sweden)

    Daniela da S. Castiglioni

    2009-09-01

    Full Text Available O efeito estimulante da spiperona e da naloxana sob a maturação ovariana foram avaliados em fêmeas de Aegla uruguayana Schmitt, 1942 e, para isto, tais neuroreguladores foram incorporados ao alimento e administrados a uma dose de 10-8 mol/animal a cada sessão de alimentação. Fêmeas adultas foram coletadas com puçá em um arroio próximo à cidade de Salto, Província de Buenos Aires, Argentina. Dez fêmeas foram sacrificadas, medidas, pesadas e os seus ovários foram retirados e pesados para a determinação do índice gonadossomático (IG. As demais fêmeas (30 foram divididas em três grupos experimentais - (a controle: alimentadas com pellets controle composto por ração para peixe - 34% de proteína e 43% de proteína; (b spiperona: alimentadas com pellets controle enriquecidos com spiperona; (c naloxana: alimentadas com pellets controle enriquecidos com naloxana. Após 7 semanas as fêmeas foram sacrificadas e avaliado o IG. Os ovários e o hepatopâncreas foram quantificados quanto aos níveis de lipídeos totais e colesterol. A naloxana produziu um aumento significativo nos níveis de lipídeos tanto nas gônadas como no hepatopâncreas em relação ao grupo controle. A spiperona produziu aumento significativo nos níveis de lipídeos nas gônadas e no hepatopâncreas e de colesterol no hepatopâncreas quando comparados ao controle. Os níveis de lipídeos foram significativamente menores na hemolinfa das fêmeas que foram alimentadas com pellets com spiperona e maiores nas fêmeas tratadas com naloxana quando comparadas as fêmeas que foram alimentadas apenas com ração. A spiperona e a naloxana, ao inibir os efeitos da dopamina e dos opióides endógenos, provavelmente causaram a secreção do hormônio estimulante das gônadas e a inibição do hormônio inibidor das gônadas, causando, portanto indução do desenvolvimento ovariano. Tal hipótese é reforçada pelos aumentos do índice gonadossomático verificado nestes grupos experimentais.The stimulatory effect of the spiperone and naloxone on the ovarian growth was evaluated in females of Aegla uruguayana Schmitt, 1942, being that these neuroregulators were incorporated to food and administrated at a dose of 10-8 mol/animal to each session food. Adult females were sampled with nets in a stream near the municipality of Salto, Province of Buenos Aires, Argentina. At the beginning of the experiment, 10 females were randomly selected, sacrificed, weighed and their ovaries were quickly dissected and weighed to serve as the initial control for evaluating the degree of ovarian growth (gonadosomatic index -GI. Others females (30 were divided in three experimental groups - (a control: females fed on control pellets composed by fish food - 34% protein and 43% protein; (b spiperone: females fed on pellets enriched with the dopaminegic antagonist spiperone; (c naloxone: females fed on pellets enriched with the enkephalinergic antagonist naloxone. After seven week of experiment the females were sacrificed and evaluated the GI. The lipids and cholesterol levels of ovaries and hepatopancreas were quantified. Naloxone produced a significant increase of lipids levels in both ovaries and hepatopancreas in relation to control group. Spiperone caused significant increase of lipids levels at the gonads and hepatopancreas and cholesterol in hepatopancreas when compared with the control. The lipids levels were significantly lower in hemolymph of the females that were fed with pellets with spiperone and higher at the females treated with naloxone when compared to females that were fed only fish food. The spiperone and naloxone when inhibited the effect of the dopamine and endogenous opioids, probably caused the secretion of the gonad stimulating hormone and the inhibition of the gonad inhibiting hormone, therefore induction of the ovarian development. Such hypothesis can be strengthened for the increases of gonadosomatic indices in these experimental groups.

  2. Additional record of Janetogalathea californiensis (Anomura: Galatheidae from the central Gulf of California, Mexico, with notes on its distribution Registro adicional de Janetogalathea californiensis (Anomura: Galatheidae del Golfo de California central, México, con notas de su distribución

    Directory of Open Access Journals (Sweden)

    Michel E. Hendrickx

    2011-04-01

    Full Text Available Specimens of galatheids Janetogalathea californiensis (Benedict, 1902 were collected in the northern portion of the Central Gulf of California and represent the third record for this species in the area. Illustrations of the material collected in the Gulf of California are provided and some differences are noted when compared to the description of the paralec-totypes. Depth range of the species is discussed and set at 87-786 m. The presence of a wide and deep Oxygen Minimum Zone in the area is believed to limit the dispersion of J. californiensis to the south and to deeper water of the gulf.Especímenes del galateido Janetogalathea californiensis (Benedict, 1902 fueron recolectados en la porción norte del golfo de California central, y representan el tercer registro de esta especie en el área. En base a ilustraciones de material recolectado en el Golfo de California, se indican algunas diferencias con respecto a la redescripción de los paralectotipos. Se discute la distribución batimétrica de la especie de la que se define un intervalo que va de 87 a 786 m de profundidad. Los resultados sugieren que la presencia de una amplia y profunda capa de oxígeno mínimo en el área podría ser la causa que limita la dispersión de J. californiensis hacia el sur y en aguas más profundas del golfo.

  3. New Record of Two Xanthid Crabs (Crustacea: Decapoda: Xanthidae from Korea

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    Lee, Sang-Kyu

    2014-10-01

    Full Text Available Xanthid crabs, decapod crustacean, with the black coloured fingers, are easily found under rocks or stones in the intertidal or subtidal zones. Two xanthids, Etisus laevimanus Randall, 1840 and Paraxanthias elegans (Stimpson, 1858, were newly reported in Korean waters as part of continuous taxonomic studies on crabs. The genus Paraxanthias Odhner, 1925 was also reported for the first time in Korea. Of these, the examined specimen of P. elegans showed eight feathery hairs on the subdistal tip of the first gonopod, which differs from the description of Dai and Yang at 1991. Here, the descriptions and illustrations of these species are provided. Korean Xanthoidea currently consists of 30 species belonging to 25 genera.

  4. Population genetic history of Aristeus antennatus (Crustacea: Decapoda in the Western and Central Mediterranean Sea.

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    Annamaria Marra

    Full Text Available Aristeus antennatus is an ecologically and economically important deep-water species in the Mediterranean Sea. In this study we investigated the genetic variability of A. antennatus sampled from 10 sampling stations in the Western and Central Mediterranean. By comparing our new samples with available data from the Western area, we aim to identify potential genetic stocks of A. antennatus and to reconstruct its historical demography in the Mediterranean. We analyzed two regions of mitochondrial DNA in 319 individuals, namely COI and 16S. We found two main results: i the genetic diversity values consistent with previous data within the Mediterranean and the absence of barriers to gene flow within the Mediterranean Sea; ii a constant long-term effective population size in almost all demes but a strong signature of population expansion in the pooled sample about 50,000 years B.P./ago. We propose two explanation for our results. The first is based on the ecology of A. antennatus. We suggest the existence of a complex meta-population structured into two layers: a deeper-dwelling stock, not affected by fishing, which preserves the pattern of historical demography; and genetically homogeneous demes inhabiting the fishing grounds. The larval dispersal, adult migration and continuous movements of individuals from "virgin" deeper grounds not affected by fishing to upper fishing areas support an effective 'rescue effect' contributing to the recovery of the exploited stocks and explain their genetic homogeneity throughout the Mediterranean Sea. The second is based on the reproduction model of this shrimp: the high variance in offspring production calls for a careful interpretation of the data observed under classical population genetics and Kingman's coalescent. In both cases, management policies for A. antennatus will therefore require careful evaluation of the meta-population dynamics of all stocks in the Mediterranean. In the future, it will be particularly relevant to sample the deepest ones directly.

  5. Muscular anatomy of the legs of the forward walking crab, Libinia emarginata (Decapoda, Brachyura, Majoidea).

    Science.gov (United States)

    Vidal-Gadea, A G; Belanger, J H

    2009-05-01

    Decapod crustaceans have been the focus of neuroethological studies for decades. With few exceptions, however, their musculature remains scarcely described. We study the neuroethology of legged locomotion in the portly spider crab, Libinia emarginata (Brachyura, Majoidea), which preferentially walks forward. Majoid crabs are thought to be among the first to have adopted the crab form (carcinification) from lobster-like ancestors, making them interesting subjects for comparative and phylogenetic studies. The radial arrangement of the legs around the thorax, coupled with its unidirectional walking modality makes L. emarginata a good candidate for the presence of anterior and posterior limb specializations. Here we describe the complete muscular anatomy of all the pereopods of L. emarginata and compare our findings with other decapods described in the literature. The number of proximal muscle bundles differs between the anterior and posterior pereopods of L. emarginata. We describe an intersegmental bundle of the flexor muscle similar to the one present in distantly related, forward walking macruran species. The behavioral repertoire, amenability to experimental investigations, and phylogenetic position make spider crabs useful species for the study of the neural control of legged locomotion. To our knowledge, this is the first instance of a complete description and comparison of the musculature in all the locomotor appendages of one species.

  6. Use of intertidal areas by shrimps (Decapoda in a brazilian Amazon estuary

    Directory of Open Access Journals (Sweden)

    HEBERT A. SAMPAIO

    2014-03-01

    Full Text Available The present work investigated the occupation and the correlation of the shrimp abundance in relation to environmental variables in different habitats (mangroves, salt marshes and rocky outcrops in an Amazon estuary. The collections were made in August and November 2009, at low syzygy tide on Areuá Beach, situated in the Extractive Reserve of Mãe Grande de Curuçá, Pará, Brazil totaling 20 pools. In each environment, we recorded the physical-chemical factors (pH, salinity, and temperature and measured the area (m2 and volume (m3 of every pool through bathymetry. The average pH, salinity, temperature, area and volume of tide pools were 8.75 (± 0.8 standard deviation, 35.45 (± 3, 29.49 °C (± 2.32, 27.41 m2 (± 41.18, and 5.19 m3 (± 8.01, respectively. We caught a total of 4,871 shrimps, distributed in three families and four species: Farfantepenaeus subtilis (98.36% (marine followed by Alpheus pontederiae (0.76% (estuarine, Macrobrachium surinamicum (0.45% and Macrobrachium amazonicum (0.43% predominantly freshwater. The species F. subtilis and A. pontederiae occurred in the three habitats, whereas M. surinamicum occurred in salt marsh and rocky outcrop and M. amazonicum only in marisma. Temperature and pH were the most important environmental descriptors that significantly affected the density and biomass of shrimps.

  7. Population biology of the crab Armases angustipes (Crustacea, Decapoda, Sesarmidae at Brazilian tropical coast

    Directory of Open Access Journals (Sweden)

    Marina de Sá Leitão C. de Araújo

    2014-06-01

    Full Text Available The semi terrestrial crabs are important elements of the fauna of coastal regions. The aim of this study was to analyze the population structure of Armases angustipes (Dana, 1852 at estuaries of the Ariquindá River, considered a non impacted area, and Mamucabas River, considered a few impacted area, on the south coast of state of Pernambuco, Brazil. The species occurred in all months of the year. The number of individuals per month varied, being higher in the months of transition between the seasons. This is probably due to significant seasonal variations of air and burrow temperature and burrow salinity. There was no sexual dimorphism in size of A. angustipes in the mangrove of Ariquindá River, but males were larger than females in the mangrove of Mamucabas River. In both estuaries, the sex ratio did not differ from Mendelian proportion, but showed a deviation for females. The analysis of temporal variation in sex ratio showed significant differences in some months of the year. These variations are due to cyclical events that act distinctly on each sex. In both estuaries, size classes of carapace width were equally represented by both sexes. The ovigerous females of A. angustipes occurred only in some months of the year, especially in summer, in both estuaries. Probably the high phytoplankton productivity observed in summer favors the reproductive activity, since these algae serve as food for the larvae. Specimens of the population of Rio Ariquindá are largest and wider than those of Mamucabas River. This fact, associated with the low abundance of crabs and the lower frequency of ovigerous females observed in Mamucabas River, is an indication that this population may be influenced by the environmental impacts that this estuary has received.

  8. Crangonidae and Glyphocrangonidae (Decapoda; Caridea) of the Southern Gulf of Mexico.

    Science.gov (United States)

    Vázquez-Bader, Ana Rosa; Gracia, Adolfo

    2013-01-01

    Distribution and abundance of species of Crangonidae and Glyphocrangonidae in the Mexican deep-waters of the Gulf of Mexico were analyzed through six research cruises onboard of the R/V Justo Sierra of the Universidad Nacional Autónoma de México using an otter trawl in a depth range of 300-1200 m. We collected two and five species of the Crangonidae and Glyphocrangonidae families, respectively. We provide information about its depth and geographic distribution, abundance, frequency of occurrence and size structure. Glyphocrangon, composed of five species (G. aculeata, G. alispina, G. haematonotus, G. longleyi and G. spinicauda), was the most common and abundant component during the benthic trawls with a total of 1125 individuals. The family Crangonidae recorded only one genus and two species (Parapontocaris caribbaea and P vicina) with 21 individuals. A taxonomic key for these crangonid and glyphocrangonid shrimps of the Gulf of Mexico is also provided.

  9. Feeding of the planktonic shrimp Lucifer faroni Borradaile, 1915 (Crustacea: Decapoda in the laboratory

    Directory of Open Access Journals (Sweden)

    Luz Amelia Vega-Pérez

    1996-01-01

    Full Text Available Feeding behavior of juveniles of the planktonic shrimp Lucifer faxoni Borradaile was studied in the laboratory under light and dark conditions. Newly-hatched nauplii and metanauplii of Artemio were used as prey organisms. The fecding raie of L. foxoni was dependent on prey size and prey density, but was not obviously affected by light or dark conditions. The capture of the prey tended to increase with longer exposure time to prey. The maximum ingestion rate was 17.28 and 13.40 nauplii.L. faxoni .d- , in the light and in the dark conditions, respectively.O comportamento alimentar de espécimens jovens de Lucifer faxoni Borradaile, em laboratório, sob condições de luz e escuro, foi estudado utilizando-se como alimento náuplios recém-eclodidos e metanáuplios de Artemio. Neste estudo a taxa de alimentação de L. faxoni foi influenciada pelo tamanho e concentração da presa, bem como pelo tempo de contato com a mesma. A atividade alimentar de L. faxoni foi maior em condições de luz, quando comparado com as condições de escuro. f- taxa máxima de ingestão calculada foi de 17,28 e 13,40 náuplios.L. faxoni .d- para as condições de luz e escuro, respectivamente.

  10. First occurrence of knight rock shrimp, Sicyonia lancifer (Olivier, 1811 (Decapoda: Sicyoniidae in the Mediterranean Sea.

    Directory of Open Access Journals (Sweden)

    A. PATANIA

    2015-01-01

    Full Text Available The occurrence of the non-native species Sicyonia lancifer  (Olivier, 1811 belonging to Sicyoniidae family is reported for the first time in the Mediterranean Sea. In the following  paper  the distinguishing features of the species are provided.

  11. Role of maxilla 2 and its setae during feeding in the shrimp Palaemon adspersus (Crustacea: Decapoda)

    DEFF Research Database (Denmark)

    Garm, A; Hallberg, E; Høeg, J T

    2003-01-01

    The movements of the basis of maxilla 2 in Palaemon adspersus were examined using macro-video recordings, and the morphology of its setae was examined using both scanning and transmission electron microscopy. The basis of maxilla 2 performs stereotypical movements in the latero-medial plane and g...

  12. Suspension feeding in adult Nephrops norvegicus (L.) and Homarus gammarus (L.) (decapoda)

    Science.gov (United States)

    Loo, Lars-Ove; Pihl Baden, Susanne; Ulmestrand, Mats

    Suspension feeding in adults of the Norway lobster Nephrops norvegicus (40-74 g) and the European lobster Homarus gammarus (280-350 g) was tested in experiments offering planktonic food items of different sizes from 200 to 600 μm and measuring the clearing capacity. Both lobster species were found to effectively clear water of food particles comprising nauplii of the brine shrimp Artemia salina of about 600 μm in size. These were reduced to 50% of the initial concentration within 5 h and to 90% within 12 h. When N. norvegicus was offered food particles averaging 200 μm, a significant reduction in average size occurred, indicating that the minimum retention size is around 200 μm. Fluorescently dyed Artemia salina were recovered in the stomach and intestine of lobsters proving that the filtered particles are passed to the digestive tract. Results from other experiments, using the blood pigment (haemocyanin) concentration as an index of nutritional state, indicated that the lobsters can get some nutritional advantage from suspension feeding. Suspension feeding in larger decapods has not been described previously, so the significance of this finding is discussed with respect to changes in behavioural and ecological role.

  13. OCORRÊNCIA DE Macrobrachium amazonicum (CRUSTACEA, DECAPODA) NA DIETA DE Lysapsus bolivianus (ANURA, HYLIDAE).

    OpenAIRE

    Mayara Fabiana Melo Furtado; Carlos Eduardo Costa-Campos; Suelique de Souza Queiroz; Kelly Juliana Gaya Correa; Inacia Maria Vieira

    2013-01-01

    A dieta de Lysapsus bolivianus está baseada principalmente em pequenos artrópodes, representados geralmente por Diptera, Collembola e Hemiptera, sendo os crustáceos encontrados ocasionalmente. No presente trabalho registramos a presença de Macrobrachium amazonicum na dieta de L. bolivianus em planície de Inundação no Norte do Brasil. Palavras-chave: dieta, Crustacea, Amazônia Oriental. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v3n3p185-187

  14. Microcassiope minor (Dana, 1852: a description of the first stage zoea (Crustacea: Decapoda: Brachyura: Xanthidae

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    P.F. CLARK

    2012-12-01

    Full Text Available The first stage zoea of Microcassiope minor (Dana, 1852 is described, illustrated and compared with thirteen other known Xanthinae. This comparison suggests that M. minor is closely related to another Atlantic Ocean xanthid, Nanocassiope melanodactyla (A. Milne-Edwards, 1867. Such an affinity may indicate that the genus Nanocassiope Guinot, 1967 is not a homogenous taxon.

  15. Macrurans (Crustacea, Decapoda) from the Lower Triassic (Olenekian) of the Ambilobé area (NW Madagascar)

    NARCIS (Netherlands)

    Garassino, Alessandro; Pasini, Giovanni; Teruzzi, Giorgio

    2003-01-01

    Fossil decapods of the Lower Triassic marine strata of Madagascar are reviewed. These display affiliation to the dendrobranchiates. These include Antrimpos madagascariensis, two species of Ifasya (I. madagascariensis and I. straeleni) and Ambilobeia karojoi.

  16. Shoaling of sergestid shrimp Acetes johni (Crustacea Decapoda: Sergestidae) associated with swarming of gammarid amphipods

    Digital Repository Service at National Institute of Oceanography (India)

    Goswami, S.C.

    zooplankton standing stock (5.81 ml.m/3). The sergestid shrimps and gammarid amphipods formed 94.7% of the zooplankton population, the former constituting more than half of the biomass of the sample. Their numerical abundance decreased with depth. The adaptive...

  17. Athanas manticolus sp. nov., a new stomatopod-associated alpheid shrimp from Vietnam (Crustacea, Decapoda).

    Science.gov (United States)

    Duriš, Zdenek; Anker, Arthur

    2014-04-01

    A new species of the alpheid shrimp genus Athanas Leach, 1814 is described based on a single specimen, an ovigerous female from Nha Trang Bay, Vietnam. Athanas manticolus sp. nov. differs from all other species of Athanas by the presence of a small post-rostral tubercle, combined with a minutely toothed rostrum, reduced extra-corneal teeth, and the absence of infra-corneal and supra-corneal teeth. In addition, the new species is characterised by its unique colour pattern, particularly by the red chromatophores disposed in randomly oriented, short, narrow streaks. As its name suggests, A. manticolus sp. nov. is commensally associated with the burrows of the nannosquillid mantis shrimp Bigelowina phalangium (Fabricius, 1798).

  18. Use of intertidal areas by shrimps (Decapoda) in a Brazilian Amazon estuary.

    Science.gov (United States)

    Sampaio, Hebert A; Martinelli-Lemos, Jussara M

    2014-03-01

    The present work investigated the occupation and the correlation of the shrimp abundance in relation to environmental variables in different habitats (mangroves, salt marshes and rocky outcrops) in an Amazon estuary. The collections were made in August and November 2009, at low syzygy tide on Areuá Beach, situated in the Extractive Reserve of Mãe Grande de Curuçá, Pará, Brazil totaling 20 pools. In each environment, we recorded the physical-chemical factors (pH, salinity, and temperature) and measured the area (m2) and volume (m3) of every pool through bathymetry. The average pH, salinity, temperature, area and volume of tide pools were 8.75 (± 0.8 standard deviation), 35.45 (± 3), 29.49 °C (± 2.32), 27.41 m2 (± 41.18), and 5.19 m3 (± 8.01), respectively. We caught a total of 4,871 shrimps, distributed in three families and four species: Farfantepenaeus subtilis (98.36%) (marine) followed by Alpheus pontederiae (0.76%) (estuarine), Macrobrachium surinamicum (0.45%) and Macrobrachium amazonicum (0.43%) predominantly freshwater. The species F. subtilis and A. pontederiae occurred in the three habitats, whereas M. surinamicum occurred in salt marsh and rocky outcrop and M. amazonicum only in marisma. Temperature and pH were the most important environmental descriptors that significantly affected the density and biomass of shrimps.

  19. Use of intertidal areas by shrimps (Decapoda) in a brazilian Amazon estuary

    OpenAIRE

    HEBERT A. SAMPAIO; Jussara M. Martinelli-Lemos

    2014-01-01

    The present work investigated the occupation and the correlation of the shrimp abundance in relation to environmental variables in different habitats (mangroves, salt marshes and rocky outcrops) in an Amazon estuary. The collections were made in August and November 2009, at low syzygy tide on Areuá Beach, situated in the Extractive Reserve of Mãe Grande de Curuçá, Pará, Brazil totaling 20 pools. In each environment, we recorded the physical-chemical factors (pH, salinity, and temperature) and...

  20. Genesis of Hematopoietic Tissue and Its Relation with Hemocytes of Litopenaeus Vannamei (Boone, 1931 (Crustacea: Decapoda

    Directory of Open Access Journals (Sweden)

    Faiz Muhammad§, Zhi-Feng Zhang*, Ming-Yu Shao, Xiao-Li Shi and Muhammad Shafi

    2013-01-01

    Full Text Available The Litopenaeus vannamei is a prime aquaculture species and has a worth market value all over the world. In this study, we investigated the genesis and morphology of hematopoietic tissue (HPT and types of hemocyte based on its morphology and cytochemical feature using histological and histochemical methods. The results revealed that HPT in L. vannamei is not visible histologically in mysis and early two post larvae (P1 & P2, and emerges in P3 which locates in epigastric region. The HPT showed a continuous propagation of cells in successive post larval stages. Four types of cells can be identified in the HPT from adult specimen and mitotic activity is visible in the HPT. The hemocytes have been differentiated into five types and some of these types are co-related with the HPT cells. The cytochemical studies suggested that type I and II cells of hemocytes are PAS positive while scanty presence of prophenoloxidase was observed in type I cells. Similarly the type I cells are Sudan Black B positive and rest of the cells showed weak activity against lipid detective stain. This is the first effort towards genesis of HPT and its relation with circulating hemocytes in L. vannamei.

  1. Aquacultural importance of the integumental pore pattern in postlarval whiteleg shrimp Litopenaeus vannamei (Decapoda: Penaeidae)

    OpenAIRE

    Jorge Alberto Cabrera-Jiménez

    2006-01-01

    The analysis of integumental pore pattern has identified two intraspecific groups of postlarval shrimp Litopenaeus vannamei (Boone, 1931), a species of which three to five natural populations or groups are expected to be found from Mexico to Peru. Natural distribution and man-made redistributions have not been typified on a population basis in any penaeid, but it is important to do so in this commercially significant group. Important factors to be defined on a geographic population or group b...

  2. Description of laboratory reared first zoea of Callinectes danae Smith (Crustacea, Decapoda, Portunidae)

    OpenAIRE

    Cheruparambil Sankarankutty; Sung Yun Hong; Kwang Bong Kim

    1999-01-01

    A detailed description of laboratory reared first zoea larva of Callinectes danae Smith, 1869 is given. The larvae utilized for this study were reared in vitro in a special incubator. A comparison with larvae of other species is also attempted.

  3. Estudos sobre a morfologia de Parastacus brasiliensis (von Martens, 1869) (Crustacea, Decapoda, Parastacidae)

    OpenAIRE

    Ana Cristina Moura Horn

    2003-01-01

    A família Parastacidae inclui os crustáceos límnicos conhecidos como lagostins-de-água-doce. A espécie Parastacus brasiliensis (von Martens, 1869) é endêmica da região meridional brasileira, ocorrendo nas bacias que formam o estuário do Guaíba, na depressão central do Estado do Rio Grande do Sul. O presente trabalho reúne um estudo da organização morfológica do lagostim Parastacus brasiliensis. Os animais foram coletados, majoritariamente nas cabeceiras do Rio Gravataí e trazidos ao Laboratór...

  4. Aspectos ecológicos dos Brachyura (Crustacea: Decapoda no manguezal do Itacorubi, SC - Brasil

    Directory of Open Access Journals (Sweden)

    Joaquim Olinto Branco

    1990-01-01

    Full Text Available Ecological studies including occurrence, relative abundance and spatial distribution of 15 species of Brachyura, as well as the fluctuation in the annual cycle are carried out in mangrove (27º 34' 14" and 27º 35' 31" L.S.; 48º 30' 07"and 48º 31' 33" L. W., during the year 1986. The hydrological parameters temperature, salinity and pH of surface and intersticial waters were also studied. Chasmagnathus granulata was the most abundant specie, followed by Uça uruguayensis, Aratus pisonii and Callinectes danae. The number of males was higher than females. In the spring a larger rate of Catches occurred. The species Eurytium limosum, Cardisoma guanhumi that had the state of São Paulo as their austral boundaru and Uça maracoani the state of Paraná, have now their boundaries of distribution expanded is for as the City of Florianópolis, in the state of Santa Catarina.

  5. Reproductive variability of Parapandalus narval (Crustacea: Decapoda) along a depth gradient

    Science.gov (United States)

    Thessalou-Legaki, Maria

    1992-12-01

    The variations of the reproductive parameters of Parapandalus narval are studied from a population off Rhodos Island, Greece. Female size (CL), dry weight (FDW) and depth of occurrence are examined as determinants of the reproductive parameters such as the percentage of ovigerous females, the stage of egg maturation, the brood size and the reproductive effort. The percentage of the ovigerous females and the egg maturation are related to depth. More ovigerous, older females with larger eggs in earlier stages of development are found in deeper waters. Nevertheless, brood size or brood dry weight regressions on female size and dry weight, respectively, show that the shallow water reproductive output increases more steeply with size or weight of the females than does that in deeper waters. Finally, the reproductive effort of Parapandalus narval does not seem to be directly related to depth but it is related to the size of the female. Small females have smaller reproductive effort than bigger ones that reach a maximum value.

  6. Depth zonation in a Parapandalus narval (Crustacea, Decapoda, Pandalidae) population from Rhodos Island, Greece

    Science.gov (United States)

    Thessalou-Legaki, Maria; Frantzis, Alexis; Nassiokas, Kostas; Hatzinikolaou, Savas

    1989-09-01

    The population characteristics of Parapandalus narval are related to depth. Sex ratio (females/males and females) decreases with depth, while female size increases. Dry weight of equal sized individuals decreases with depth. For the 23 and 80 + 140 m females, the relative dry weight reduction was estimated to 10·3% and 16·0% compared to that of the 5 m females, respectively. Males (80-220 m) exhibited the greatest reduction of 19·9%. It is suggested that the depth zonation exhibited by the P. narval population is related to habitat differences along the depth range sampled and has to do with the exploitation of the available food resources by different sex and/or size groups.

  7. Food preference in the cultured species, Penaeus monodon Fabricius (Crustacea: Decapoda)

    OpenAIRE

    S. Khanum; Tirmizi, N.M.

    1997-01-01

    The study of food preference is necessitated by the need to promote coastal culture of shrimps in Pakistan. The cultured Penaeus monodon was selected for study. Food preferences have been examined through the analysis of the gut contents. The shrimp shows a seasonal variation in its preference to food and feeding.

  8. Penaeidins, a new family of antimicrobial peptides isolated from the shrimp Penaeus vannamei (Decapoda).

    Science.gov (United States)

    Destoumieux, D; Bulet, P; Loew, D; Van Dorsselaer, A; Rodriguez, J; Bachère, E

    1997-11-07

    We report here the isolation of three members of a new family of antimicrobial peptides from the hemolymph of shrimps Penaeus vannamei in which immune response has not been experimentally induced. The three molecules display antimicrobial activity against fungi and bacteria with a predominant activity against Gram-positive bacteria. The complete sequences of these peptides were determined by a combination of enzymatic cleavages, Edman degradation, mass spectrometry, and cDNA cloning using a hemocyte cDNA library. The mature molecules (50 and 62 residues) are characterized by an NH2-terminal domain rich in proline residues and a COOH-terminal domain containing three intramolecular disulfide bridges. One of these molecules is post-translationally modified by a pyroglutamic acid at the first position. Comparison of the data obtained from the cDNA clones and mass spectrometry showed that two of these peptides are probably COOH-terminally amidated by elimination of a glycine residue. These molecules with no evident homology to other hitherto described antimicrobial peptides were named penaeidins.

  9. Lunar rhythms in the egg hatching of the subtidal crustacean: Callinectes arcuatus Ordway (Decapoda: Brachyura)

    Science.gov (United States)

    DeVries, M. C.; Epifanio, C. E.; Dittel, A. I.

    1983-12-01

    Gravid female portunid crabs, Callinectes arcuatus, were held in a recirculating seawater system and the development of the eggs was observed. Based on morphological criteria, nine developmental stages were noted. The relationship between a given stage and the subsequent time to hatching was determined. Based on this, an index was devised that predicted hatching date from microscopic observation of an egg mass. This index was used to predict the date of hatching of eggs from 439 crabs collected in the Gulf of Nicoya, Central America, and the frequency of hatching was analysed in relation to the lunar and tidal cycles. Significantly more eggs hatched during periods of spring than neap tides. The adaptive significance of this rhythmicity is unclear at present.

  10. Thermal biology of the sub-polar–temperate estuarine crab Hemigrapsus crenulatus (Crustacea: Decapoda: Varunidae)

    Science.gov (United States)

    Cumillaf, Juan P.; Blanc, Johnny; Paschke, Kurt; Gebauer, Paulina; Díaz, Fernando; Re, Denisse; Chimal, María E.; Vásquez, Jorge; Rosas, Carlos

    2016-01-01

    ABSTRACT Optimum temperatures can be measured through aerobic scope, preferred temperatures or growth. A complete thermal window, including optimum, transition (Pejus) and critical temperatures (CT), can be described if preferred temperatures and CT are defined. The crustacean Hemigrapsus crenulatus was used as a model species to evaluate the effect of acclimation temperature on: (i) thermal preference and width of thermal window, (ii) respiratory metabolism, and (iii) haemolymph proteins. Dependant on acclimation temperature, preferred temperature was between 11.8°C and 25.2°C while CT was found between a minimum of 2.7°C (CTmin) and a maximum of 35.9°C (CTmax). These data and data from tropical and temperate crustaceans were compared to examine the association between environmental temperature and thermal tolerance. Temperate species have a CTmax limit around 35°C that corresponded with the low CTmax limit of tropical species (34–36°C). Tropical species showed a CTmin limit around 9°C similar to the maximum CTmin of temperate species (5–6°C). The maximum CTmin of deep sea species that occur in cold environments (2.5°C) matched the low CTmin values (3.2°C) of temperate species. Results also indicate that the energy required to activate the enzyme complex (Ei) involved in respiratory metabolism of ectotherms changes along the latitudinal gradient of temperature. PMID:26879464

  11. Molecular data raise the possibility of cryptic species in the Brazilian endemic prawn Macrobrachiumpotiuna (Decapoda, Palaemonidae

    Directory of Open Access Journals (Sweden)

    Fabrício L de Carvalho

    2013-09-01

    Full Text Available A recent taxonomic revision indicated that Macrobrachiumpotiuna, an endemic prawn in Brazilian freshwater drainages, exhibits wide morphological variability along its limited geographical distribution. However, in some cases, taxonomic doubts at the species level have no clear morphological resolution. Considering that no molecular data of M. potiuna along its distribution were available to provide a complete and integrated overview, we analyzed 21 partial sequences (531 bp from the mitochondrial 16S rRNA gene of M. potiuna and 9 sequences from outgroup species, by maximum likelihood and parsimony, in order to investigate the possibility of the existence of cryptic species, within the morphologically based M. potiuna. The topologies obtained revealed that M. potiuna represents a monophyletic clade. Nevertheless, two clades supported by both analyses were formed within the M. potiuna taxon. The mean genetic divergence between these two groups was 0.044 ± 0.007, and within each group (i.e., M. potiuna "sensu stricto" andM. potiuna "Affinis-Clade" the divergences were 0.010 ± 0.003 and 0.028 ± 0.005, respectively. As far as we know, this is the first report to show a genetic separation between populations of prawns with abbreviated larval development in South American drainages. Pending additional analysis, to propose a conclusive inference, the existence of these distinct genetic groups must be considered in future studies with the morphologically based M. potiuna. In addition, we extended the known northern distribution with a record from the state of Bahia.

  12. Records of Hippa strigillata (Stimpson, 1860 (Crustacea: Decapoda: Hippidae in the SE Gulf of California, Mexico

    Directory of Open Access Journals (Sweden)

    Daniela Ríos-Elósegui

    Full Text Available This paper presents details regarding the collections and records of H. strigillata in the Bay of Mazatlán, SE Gulf of California, Mexico. Samples of H. strigillata were obtained in this bay and suroundings area during different periods and deposited in the collection of UNAM, Mazatlán. Morphometric data, distribution, biological and ecological data were furnished.

  13. Notes on two species of Processa (Decapoda: Processidae from the Mexican Pacific

    Directory of Open Access Journals (Sweden)

    Manuel Ayón-Parente

    Full Text Available Material belonging to the genus Processa, held in the Regional Marine Invertebrates Collection in Mazatlán, Mexico, is revised including specimens of the widely distributed P. peruviana, and the scarcely collected P. hawaiensis. For comparative purposes with the specimens from Hawaii and other localities, a detailed description of a male of P. hawaiensis collected in continental Mexico is provided, including illustrations of all appendages. Small differences are noted with previous description and partial redescriptions of this species, including proportion between propodus and dactylus of the fourth pereopod, and between merus and carpus of the right cheliped. In addition, the shape and setation of the first pair of pleopods in the Mexican material differs from the description of P. hawaiensis based on African material.

  14. Ensayo de diferentes lecitinas en la dieta de juveniles de Penaeus vannamei (Crustacea: Decapoda

    Directory of Open Access Journals (Sweden)

    Ana Denisse Re-Araujo

    2003-09-01

    Full Text Available Para comparar diferentes niveles y calidades de lecitina se hizo un bioensayo nutricional con dietas isoenergéticas; para medir el crecimiento, la tasa de conversión alimenticia y sobrevivencia de juveniles de P. vannamei (290 mg ± 0.02. Las lecitinas experimentales fueron de calamar, lecitina liquida de soya (7%, lecitina desaceitada de soya (3.48% en combinación con aceite de pescado o lípidos neutros de calamar, en una formula parcialmente desaceitada. Las cinco dietas fueron administradas ad libitum con cuatro replicas (estanques de 15 camarones cada uno (5 x 4 x 15, durante 28 días. La mayor ganancia en peso fue (191% y FCR (1.69±0.041 fueron obtenidos con la dieta que contenía 7% de lecitina cruda de soya como única fuente de lípidos, seguida por la dieta que contenía 3.94% de lecitina desaceitada y 2.24% de aceite Menhaiden (172% y 2.03±0.054 respectivamente. Como se esperaba los resultados menos propicios fueron con la dieta que no contenía lecitina (121% y 2.42±0.129. La lecitina cruda de soya, cubrió los requerimientos de fosfolípidos y de lípidos neutrales, tanto como la dieta con lecitina desaceitada de soya con aceite de pescado o aceite de calamarThe effect of different lecithin sources and presentations on growth, food conversion ratio and survival of P. vannamei (290 mg ± 0.02 was studied. The bioassay was designed in order to compare different dietary levels and different quality of lecithin. Squid lecithin, crude soybean (7%, deoiled soybean lecithin (3.48% in combination with fish oil or squid neutral lipids, in a partially dilapidate formula. The isoenergetic diets were fed ad libitum to four replicate groups (tanks of 15 shrimps each (5 x 4 x 15, during 28 days. The result of the bioassay with the partially dilapidate formulas was; the best growth rate (191% and FCR (1.69±0.041 were obtained with the diet containing 7% of soybean crude lecithin as the unique lipid source. Followed by the diet countering 3.94% deoiled lecithin and 2.42% Menhaden oil (172% and 2.03±0.054 respectively. As expected, the worst results were obtained without the dietary lecithin 121% and 2.42±0.129. Crude soybean lecithin alone covered the phospholipid and neutral lipids requirements as well as the combination of deoiled soybean lecithin with fish or squid oil

  15. Bornean freshwater crabs of the genus Arachnothelphusa gen. nov. (Crustacea: Decapoda: Brachyura: Gecarcinucidae)

    NARCIS (Netherlands)

    Ng, P.K.L.

    1991-01-01

    A new genus, Arachnothelphusa gen. nov., is established for five species of Bornean freshwater crabs (Gecarcinucidae) previously placed in Thelphusula Bott, 1969. One species from Sabah, A. terrapes, is here described as new. The genus is characterised by its long ambulatory legs, shape of the carap

  16. Growth of hatchery raised banana shrimp Penaeus merguiensis (de Man) (Crustacea: Decapoda) juveniles under different salinity

    Digital Repository Service at National Institute of Oceanography (India)

    Saldanha, C.M.; Achuthankutty, C.T.

    relationships of estuaries to the fisheries of the Gulf of Mexico, in Estuaries, edited by Lauff G H (Amer Ass Adv Sci Publ, Washington D C) 1967, pp. 621-638. 3 Mair J McD, Salinity and water-type preference of four species of postlarval shrimp (Penaeus) from... west Mexico, J Exp Mar Biol Ecol, 45(1980)69-82. 4 Achuthankutty C T & Parulekar A H, Biology of commercially important penaeid prawns of Goa waters, Indian J Mar Sci, 15 (1986)171-173. 5 Achuthankutty C T & Parulekar A H, Distribution of penaeid...

  17. Estudo do crescimento relativo de Austinixa patagoniensis (Rathbun (Decapoda, Pinnotheridae simbionte de Callichirus major (Say (Decapoda, Callianassidae no mesolitoral da praia de Balneário Camboriú, Santa Catarina, Brasil Relative growth of Austinixa patagoniensis (Rathbun (Decapoda, Pinnotheridae, a symbiotic crab of Callichirus major (Say (Decapoda, Callianassidae on the midlittoral of Balneário Camboriú beach, Santa Catarina, Brazil

    Directory of Open Access Journals (Sweden)

    Eliana dos S. Alves

    2005-09-01

    Full Text Available O crescimento relativo de Austinixa patagoniensis (Rathbun, 1918, simbionte do callianassídeo Callichirus major (Say, 1818 na praia de Balneário Camboriú, Santa Catarina (26º59'S, 48º39'W, foi estudado separadamente para 119 juvenis, 228 machos e 249 fêmeas. O método funcional de regressão foi utilizado para o estudo das seguintes variáveis: largura e comprimento da carapaça, largura máxima do abdome, altura máxima do própodo do quelípodo, comprimento inferior e superior total do própodo do quelípodo. A largura da carapaça (LC foi adotada como medida de referência. Com exceção da altura do própodo do quelípodo de juvenis e do comprimento superior do própodo do quelípodo de fêmeas, que cresceram segundo o modelo linear, as demais variáveis estudadas foram melhor descritas pelo modelo potencial. A análise do crescimento relativo de A. patagoniensis permitiu observar que as diversas alterações morfológicas processadas ao longo da ontogenia desta espécie encontram-se relacionadas com fins reprodutivos. A presença de pontos de transição no crescimento da quela e do abdome, permitiu estimar o tamanho de maturação sexual de A. patagoniensis na praia de Balneário Camboriú em 7,8-7,9 mm e 7,9-8,3 mm (LC para machos e fêmeas, respectivamente. Valores praticamente idênticos foram encontrados para a mesma espécie na praia do Cassino, Rio Grande do Sul (32°13'S, 52°15'W, onde A. patagoniensis está associada ao também callianassídeo Sergio mirim (Rodrigues, 1971. Dessa forma, sugere-se que o tamanho de maturação da espécie não varia entre hospedeiros e no intervalo latitudinal analisado, apesar de terem sido detectadas diferenças no tamanho máximo atingido pelos organismos, assim como na sua fecundidade e no comportamento reprodutivo.The relative growth of Austinixa patagoniensis (Rathbun, 1918, a symbiotic crab inhabiting burrows of the callianassid shrimp Callichirus major (Say, 1818 in Balneário Camboriú beach, Santa Catarina (26º59'S, 48º39'W was studied in 119 juveniles, 228 males and 249 females. Functional regressions were used to describe the relative growth of the following variables: carapace length and width, abdomen width, maximum height and length of the upper and lower margins of the propodus of the left chelipod. Carapace width (CW was used as the reference dimension. Excepting the height of the propodus of juveniles and the upper length of the chelae of females whose relative growth was described by a linear model, all variables were better described by the traditional potential model. Results of the analysis showed that morphological changes detected during the ontogeny of A. patagoniensis are related to reproduction. The occurrence of transition points in the chelae and abdomen growth indicates that the species matures in Balneário Camboriú at 7,8-7,9 mm (males and 7,9-8,3 mm (females of carapace width. The same values were found also for the species in Cassino beach, Rio Grande do Sul (32°13'S, 52°15'W, where the species is associated to another host, the callianassid shrimp Sergio mirim (Rodrigues, 1971. Therefore, it is suggested that the size at maturity of A. patagoniensis does not vary between hosts and latitude (at least between the studied limits, in spite of the differences observed in maximum attained sizes, fecundity and reproductive behavior of the two sites.

  18. Les processidae (Crustacea Decapoda Natantia) des eaux Européennes

    NARCIS (Netherlands)

    Nouvel, H.; Holthuis, L.B.

    1957-01-01

    PRÉ FACE Au cours d'études sur la biologie des Processa des mers européennes (1937-1944), le premier auteur fut frappé par les différences singulières que présentaient des spécimens qui, en accord avec l'opinion courante, devaient se rapporter à une même espèce. I1 résolut d'approfondir le côté syst

  19. Larval and postlarval stages of @iSicyonia@@ H. M. Edwards (Decapoda, Penaeidea: Sicyoniidae)

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.

    A third protozoeal stage and a late postlarval stage of a species belonging to the genus @iSicyonia@@ are described here with illustrations. The protozoea of @iSicyonia@@ can be easily distinguished by the presence of the long antennular peduncle...

  20. The curious case of Neotroglocarcinus dawydoffi (Decapoda, Cryptochiridae): unforeseen biogeographic patterns resulting from isolation

    KAUST Repository

    Van Der Meij, Sancia E.T.

    2014-09-09

    © 2014 The Trustees of the Natural History Museum, London. Coral gall crabs form a commonly overlooked component of the associated fauna of shallow-water reef corals and therefore little is known about their ecology and biogeography. This study investigated the biogeography and phylogenetic position of the informal Detocarcini species group within the Cryptochiridae. We used molecular data for two mitochondrial markers (COI and 16S) obtained from gall crabs covering (part of) a wide geographic range: the Red Sea, Malaysia, Indonesia and New Caledonia. Our phylogeny reconstructions portrayed the Detocarcini as paraphyletic within the monophyletic Cryptochiridae. A phylogeographic clustering was noticed in Neotroglocarcinus dawydoffi that was absent in its sister species, N. hongkongensis, and the closely related species Pseudocryptochirus viridis. A Neighbour Network was estimated for the N. dawydoffi dataset to visualize the similarity between sequences from different biogeographic areas, resulting in three groupings: (1) New Caledonia with Lembeh/Ternate (eastern Indonesia), (2) Semporna/Kudat (eastern Malaysia), and (3) Red Sea (Saudi Arabia). Cryptic speciation rather than isolation is discussed and rejected as an alternative explanation for the observed biogeographic pattern.

  1. Dead shrimp blues: a global assessment of extinction risk in freshwater shrimps (Crustacea: Decapoda: Caridea.

    Directory of Open Access Journals (Sweden)

    Sammy De Grave

    Full Text Available We present the first global assessment of extinction risk for a major group of freshwater invertebrates, caridean shrimps. The risk of extinction for all 763 species was assessed using the IUCN Red List criteria that include geographic ranges, habitats, ecology and past and present threats. The Indo-Malayan region holds over half of global species diversity, with a peak in Indo-China and southern China. Shrimps primarily inhabit flowing water; however, a significant subterranean component is present, which is more threatened than the surface fauna. Two species are extinct with a further 10 possibly extinct, and almost one third of species are either threatened or Near Threatened (NT. Threats to freshwater shrimps include agricultural and urban pollution impact over two-thirds of threatened and NT species. Invasive species and climate change have the greatest overall impact of all threats (based on combined timing, scope and severity of threats.

  2. A new species of crinoid-associated Periclimenes from Honduras (Crustacea: Decapoda: Palaemonidae).

    Science.gov (United States)

    De Grave, Sammy

    2014-05-02

    A new species of crinoid associated Periclimenes, P. rincewindi sp. nov. is described from the Bay Islands (Honduras) in the Caribbean. The species associates with the swimming crinoid, Analcidometra armata and displays a unique colour pattern. Morphologically, the new species is closely related to the other known crinoid associates in the Caribbean, specifically Periclimenes crinoidalis, from which it can be distinguished by a suite of relatively minor morphological features.

  3. Studies on the planktonic Decapoda and Stomatopoda (Crustacea) from the western Bay of Bengal

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.; Nair, V.R.; Goswami, S.C.

    Abundance and distribution of decapods and stomatopods were studied, based on 90 samples collected from the western Bay of Bengal (Lat. 09 degrees 58' and 20 degrees 50'N and long. 80 degrees 00'E) between 24 August and 2 October, 1976. The decapod...

  4. The complete mitogenome of the Norway lobster Nephrops norvegicus (Linnaeus, 1758) (Crustacea: Decapoda: Nephropidae).

    Science.gov (United States)

    Gan, Han Ming; Tan, Mun Hua; Gan, Huan You; Lee, Yin Peng; Austin, Christopher M

    2016-09-01

    The clawed lobster Nephrops norvegicus is an important commercial species in European waters. We have sequenced the complete mitochondrial genome of the species from a partial genome scan using Next-Gen sequencing. The N. norvegicus has a mitogenome of 16,132 base pairs (71.22% A+ T content) comprising 13 protein-coding genes, 2 ribosomal subunit genes, 21 transfer RNAs, and a putative 1259 bp non-coding AT-rich region. This mitogenome is the second fully characterized for the family Nephropidae and the first for the genus Nephrops. The mitogenome gene order is identical to the Maine lobster, Homarus americanus with the exception of the possible loss of the trnI gene.

  5. Agonistic behaviour in juvenile southern rock lobster, Jasusedwardsii (Decapoda, Palinuridae): implications for developing aquaculture.

    Science.gov (United States)

    Carter, Chris G; Westbury, Heath; Crear, Bradley; Simon, Cedric; Thomas, Craig

    2014-01-01

    The Southern rock lobster, Jasusedwardsii, is a temperate species of spiny lobster with established well managed fisheries in Australia and New Zealand. It has also been under consideration as a species with aquaculture potential. Agonistic behaviour has important consequences under aquaculture conditions that encompass direct effects, such as damage or death of protagonists, and indirect effects on growth that relate to resource access, principally food and refuge. This study aimed to identify and characterize behaviours and to make a preliminary investigation of their occurrence under tank culture. Juvenile Jasusedwardsii were examined in a flow-through seawater system using a remote video camera system. Twenty-nine behaviours were divided into three sub-groups: aggressive (11), avoidance (6) and others (12). Aggressive behaviours included attacks, pushing, lifting, clasping and carrying an opponent. Avoidance behaviours included moving away in a backwards-, forwards- or side-stepping motion as well as with more vigorous tail flips. These behaviours were components of twelve behavioural groups that described contact, attack and displacement between individuals. Activity was crepuscular with two clear peaks, one in the morning and the other in the evening. The occurrence of behavioural groups was not different between the morning and evening. The frequency of aggressive behaviours was not affected by changes made to stocking density or access to food. The implications of agonistic behaviours are discussed further in relation to developing aquaculture.

  6. Complete mitochondrial genome of the furry lobster Palinurellus wieneckii (De Man, 1881) (Decapoda, Achelata, Palinuridae).

    Science.gov (United States)

    Yang, Chien-Hui; Liu, Yuan; Cui, Zhaoxia; Chan, Tin-Yam

    2014-08-01

    Complete sequence of the mitochondrial genome (mitogenome) for the rare lobster genus Palinurellus (species P. wieneckii) is reported for the first time. The genus Palinurellus is peculiar looking and was previously considered to belong to a distinct family Synaxidae. However, recent molecular phylogenetic analyses based on partial sequences of various genes showed that Synaxidae is an invalid family and Palinurellus should be placed inside Palinuridae. The complete mitogenome of P. wieneckii is compared to the genetic structures with six other Achelata species with mitogenome sequence reported. The gene order of P. wieneckii is identical to the other Achelata lobsters, but with lower A + T content (63.6% versus 64.5-67.5%). Sequence nucleotide dissimilarity of P. wieneckii is considerably higher (37.7-40.3%) than amongst the five Palinuridae s.s. species (17.1-32.9%), and approximate to the range between Palinuridae s.s. and Scyllaridae (39.1-40.4%).

  7. Morphological and histological studies on the embryonic development of the freshwater prawn, Macrobrachium rosenbergii (Crustacea, Decapoda

    Directory of Open Access Journals (Sweden)

    Madlen M. Habashy

    2012-05-01

    Full Text Available The present work was carried out to describe the embryonic changes during development of the freshwater prawn Macrobrachium rosenbergii based on some morphological and histological features. In addition the biochemical composition of eggs was investigated during the embryonic development of the studied species. Results revealed that eggs of M. rosenbergii completed their development in 20 days at 28.5 ± 0.45 °C. The present investigation showed that primordial germ cells (PGCs were detected early in the examined embryos. In 6.5 days old embryo, a cluster of PGCs occupied the dorso-medial region behind the yolky portion. In addition, the biochemical data indicated that the protein content was significantly increased, while lipid and carbohydrate contents decreased during the embryonic development. The lowest water content was found in the bright orange eggs and reached its highest level in the deep brown eggs. It was noted that the increase in the water content was correlated with the increase in the egg diameters. It was also concluded that, variations in the biochemical compositions of eggs reflected changes in their morphogenesis during the embryonic development.

  8. Grooming as a secondary behavior in the shrimp Macrobrachium rosenbergii (Crustacea, Decapoda, Caridea

    Directory of Open Access Journals (Sweden)

    Lauren VanMaurik

    2014-11-01

    Full Text Available The giant freshwater prawn, Macrobrachium rosenbergii, is a large shrimp extensively used in aquaculture whose grooming behaviors were analyzed in this study. Macrobrachium rosenbergii exhibits three unique male morphotypes that differ in their behavior, morphology and physiology: small-clawed males (SM, orange-clawed males (OC and blue-clawed males (BC. The largest and most dominant males, BC males, are predicted to have significantly different grooming behaviors compared to females and the other two male morphotypes. These BC males may be too large and bulky to efficiently groom and may dedicate more time to mating and agonistic interactions than grooming behaviors. Observations were conducted to look at the prevalence of grooming behaviors in the absence and presence of conspecifics and to determine if any differences in grooming behavior exist among the sexes and male morphotypes. Significant differences in the grooming behaviors of all individuals (females and male morphotypes were found. BC males tended to have the highest grooming time budget (percent of time spent grooming while SM males had a relatively low grooming time budget. The grooming behaviors of the male morphotypes differed, indicating while these males play distinct, separate roles in the social hierarchy, they also have different grooming priorities. The conditions in which M. rosenbergii are cultured may result in increased body fouling, which may vary, depending on the grooming efficiencies and priorities of these male morphotypes. Overall, grooming behaviors were found to be a secondary behavior which only occurred when primary behaviors such as mating, feeding or fighting were not present.

  9. Notes on Indo-West Pacific Crustacea Decapoda III to IX

    NARCIS (Netherlands)

    Holthuis, L.B.

    1995-01-01

    Seven short notes: (1) describing a new species of Macrobrachium from Madagascar, (2) synonymizing Chlorotocella leptorhynchus (Stimpson, 1860) with C. spinicaudus (H. Milne Edwards, 1837), (3) synonymizing Rhynchocinetes rugulosus Stimpson, 1860, with R. serratus (H. Milne Edwards, 1837), (4) estab

  10. A new species of Macrobrachium Spence Bate, 1868 (Decapoda, Palaemonidae), M. pantanalense, from the Pantanal, Brazil.

    Science.gov (United States)

    Dos Santos, Antonina; Hayd, Liliam; Anger, Klaus

    2013-01-01

    The neotropical species Macrobrachium amazonicum (Heller, 1862) is considered a particularly successful species, showing an extremely wide range of distribution (ca 4.000 km across). Populations assigned to this species live in estuaries along the northern and northeastern coasts of South America as well as in fresh water habitats in the Amazon, Orinoco and Paraná-Paraguay river basins. Following recent comparative studies that showed differential ecological, reproductive, developmental and physiological traits in geographically separated populations from the Amazon delta and the Pantanal region, Brazil, we examined the morphology of adult shrimps from these two regions. Based on significant differences, we conclude that the Pantanal population constitutes a new species, which is described here as Macrobrachium pantanalense. The main differences between M. amazonicum and the new species have been found in the morphology of the second pereiopod, the telson, and in the color patterns of both males and females. A modification on the key of American species of Macrobrachium is provided to accommodate the new species.

  11. Reproductive and morphometric traits of Macrobrachium amazonicum (Decapoda: Palaemonidae) from the Pantanal, Brazil, suggests initial speciation.

    Science.gov (United States)

    Hayd, Liliam; Anger, Klaus

    2013-03-01

    The palaemonid shrimp Macrobrachium amazonicum shows an unusually large geographic range (ca. 4000km across) living in coastal, estuarine, and limnic inland habitats of the upper Amazon, Orinoco, and La Plata basins. This raises doubts whether allopatric, ecologically diverse populations belong to the same species. While shrimps from estuarine and Amazonian habitats have been studied in great detail, very little is known about hololimnetic inland populations. In the present study, biological traits related to growth (maximum body size, fresh weight, morphometric relationships) and reproduction (sex ratio; occurrence of male morphotypes; minimum sexable size; minimum size of ovigerous females; fecundity; egg size), were studied in M amazonicum collected from a pond culture and two natural freshwater habitats (Rio Miranda; Lagoa Baiazinha) in the Pantanal of Mato Grosso do Sul, Brazil. In total, 2270 shrimps were examined (603 males; 1667 females, 157 of these ovigerous). Sex ratio (males:females) was at all sampling sites strongly female-biased, ranging from 0.2-0.6. Maximum body size was larger in natural habitats compared to the pond culture, suggesting reduced growth or a shorter life span under artificial mass rearing conditions. Maximum fecundity observed in our material was 676 eggs, reached by the largest female (TL=65mm; Lagoa Baiazinha). A significant difference between slope parameters of linear regressions describing fecundity, either in terms of numbers of eggs laid or of larvae released, in relation to female fresh weight, indicates egg losses. This may be due in part to a 2.4-fold increase in egg volume occurring during the course of embryonic development, while the available space under the abdomen remains limited. Size-weight relationships differed significantly between males and females, indicating sexspecific morphometric differences. Males appear to have a more slender body shape than females, reaching thus lower weight at equal TL. When reproductive and morphometric traits are compared with literature data from estuarine and inland populations living in the Amazon and Orinoco plains, shrimps from the Pantanal show conspicuous peculiarities differing from other populations: (1) maximum body size is far smaller, suggesting shorter longevity; (2) females are consistently larger than males; (3) different male morphotypes are absent; (4) minimum sexable size and (5) minimum size of ovigerous females are smaller. These traits suggest a heterochronic shift (predisplacement) of sexual maturation and r-selection. In summary, our data show biologically relevant differences in life-history traits of shrimps from the Pantanal compared to M. amazonicum populations in other regions. All these differences persist also in long-term cultures maintained under constant conditions. Altogether, our data support the hypothesis that M amazonicum in the Paraná-Paraguay drainage basin has phylogenetically diverged from allopatric populations that are hydrologically separated by continental watersheds, implying an at least incipient vicariant speciation.

  12. Phylogeny and evolutionary patterns in the Dwarf crayfish subfamily (Decapoda: Cambarellinae.

    Directory of Open Access Journals (Sweden)

    Carlos Pedraza-Lara

    Full Text Available The Dwarf crayfish or Cambarellinae, is a morphologically singular subfamily of decapod crustaceans that contains only one genus, Cambarellus. Its intriguing distribution, along the river basins of the Gulf Coast of United States (Gulf Group and into Central México (Mexican Group, has until now lacked of satisfactory explanation. This study provides a comprehensive sampling of most of the extant species of Cambarellus and sheds light on its evolutionary history, systematics and biogeography. We tested the impact of Gulf Group versus Mexican Group geography on rates of cladogenesis using a maximum likelihood framework, testing different models of birth/extinction of lineages. We propose a comprehensive phylogenetic hypothesis for the subfamily based on mitochondrial and nuclear loci (3,833 bp using Bayesian and Maximum Likelihood methods. The phylogenetic structure found two phylogenetic groups associated to the two main geographic components (Gulf Group and Mexican Group and is partially consistent with the historical structure of river basins. The previous hypothesis, which divided the genus into three subgenera based on genitalia morphology was only partially supported (P = 0.047, resulting in a paraphyletic subgenus Pandicambarus. We found at least two cases in which phylogenetic structure failed to recover monophyly of recognized species while detecting several cases of cryptic diversity, corresponding to lineages not assigned to any described species. Cladogenetic patterns in the entire subfamily are better explained by an allopatric model of speciation. Diversification analyses showed similar cladogenesis patterns between both groups and did not significantly differ from the constant rate models. While cladogenesis in the Gulf Group is coincident in time with changes in the sea levels, in the Mexican Group, cladogenesis is congruent with the formation of the Trans-Mexican Volcanic Belt. Our results show how similar allopatric divergence in freshwater organisms can be promoted through diverse vicariant factors.

  13. Testing phylogenetic hypotheses of the subgenera of the freshwater crayfish genus Cambarus (Decapoda: Cambaridae.

    Directory of Open Access Journals (Sweden)

    Jesse W Breinholt

    Full Text Available BACKGROUND: The genus Cambarus is one of three most species rich crayfish genera in the Northern Hemisphere. The genus has its center of diversity in the Southern Appalachians of the United States and has been divided into 12 subgenera. Using Cambarus we test the correspondence of subgeneric designations based on morphology used in traditional crayfish taxonomy to the underlying evolutionary history for these crayfish. We further test for significant correlation and explanatory power of geographic distance, taxonomic model, and a habitat model to estimated phylogenetic distance with multiple variable regression. METHODOLOGY/PRINCIPAL FINDINGS: We use three mitochondrial and one nuclear gene regions to estimate the phylogenetic relationships for species within the genus Cambarus and test evolutionary hypotheses of relationships and associated morphological and biogeographical hypotheses. Our resulting phylogeny indicates that the genus Cambarus is polyphyletic, however we fail to reject the monophyly of Cambarus with a topology test. The majority of the Cambarus subgenera are rejected as monophyletic, suggesting the morphological characters used to define those taxa are subject to convergent evolution. While we found incongruence between taxonomy and estimated phylogenetic relationships, a multiple model regression analysis indicates that taxonomy had more explanatory power of genetic relationships than either habitat or geographic distance. CONCLUSIONS: We find convergent evolution has impacted the morphological features used to delimit Cambarus subgenera. Studies of the crayfish genus Orconectes have shown gonopod morphology used to delimit subgenera is also affected by convergent evolution. This suggests that morphological diagnoses based on traditional crayfish taxonomy might be confounded by convergent evolution across the cambarids and has little utility in diagnosing relationships or defining natural groups. We further suggest that convergent morphological evolution appears to be a common occurrence in invertebrates suggesting the need for careful phylogenetically based interpretations of morphological evolution in invertebrate systematics.

  14. Leptalpheus pereirai sp. nov., a new alpheid shrimp from Panama and Venezuela (Decapoda: Caridea).

    Science.gov (United States)

    Anker, Arthur; Caripe, Jonathan Vera

    2016-06-22

    A new species of the infaunal alpheid shrimp genus Leptalpheus Williams, 1965 is described based on material from three localities on the Caribbean coast of Panama and Isla Chimana Grande, Venezuela. Leptalpheus pereirai sp. nov. belongs to a group of species characterised by the presence of well-developed adhesive disks on the major chela and appears to dwell in burrows of the large callianassid ghost shrimp, Glypturus acanthochirus Stimpson 1866.

  15. Brachyura (Crustacea, Decapoda associated to Schizoporella unicornis (Bryozoa, Gymnolaemata in Ubatuba bay (SP, Brazil

    Directory of Open Access Journals (Sweden)

    Fernando L. M. Mantelatto

    1998-01-01

    Full Text Available This work characterizes the composition of Brachyura from Schizoporella unicornis. The samples were collected in 1995 at Itaguá Beach, Ubatuba (SP, at three month intervals, during all seasons from January to December. The Bryozoa colonies were obtained by snorkeling at a depth of five meters in daylight. A total of 323 specimens were collected from four families (Xanthidae, Portunidae, Majidae and Grapsidae. Pachygrapsus transversus, Hexapanopeus schimitti, and Menippe nodifrons occurred in all seasons. The highest and lowest number of individuals occurred during the spring and autumn, respectively. Xanthidae exhibited the highest density during the summer, autumn, and spring, while Grapsidae exhibited the highest density in winter. It was noted the presence of Charibdis hellerii, an portunid from Indo-Pacific ocean. The diversity of species obtained, in addition to an accentuated number of immature and ovigerous females specimens, suggested that Schizoporella colonies were a place of reproduction and development.Este trabalho caracterizou a composição dos braquiúros em Schizoporella unicornis. As amostras foram coletadas na Praia do Itaguá, Ubatuba (SP, em intervalos de três meses, durante as estações climáticas de Janeiro a Dezembro/1995. As colônias de briozoários foram obtidas por mergulho livre, coletadas pela manhã. Um total de 323 espécimes foram coletados dentro de quatro famílias (Xanthidae, Portunidae, Majidae e Grapsidae. Pachygrapsus transversus, Hexapanopeus schimitti e Menippe nodifrons ocorreram em todas as estações. O maior e o menor número de indivíduos foram registrados na primavera e no outono, respectivamente. Xanthidae exibiu maior densidade no verão, outono e primavera, enquanto Grapsidae foi no inverno. Registrou-se a ocorrência de Charibdis hellerii, espécie originária do Indo-Pacífico. A diversidade de espécies obtida, juntamente com o acentuado número de indivíduos imaturos e fêmeas ovígeras, constituem indícios de que colônias de Schizoporella constituem um local de reprodução e desenvolvimento para estes crustáceos

  16. On two species of Archipelothelphusa Bott, 1969 (Crustacea: Decapoda: Brachyura: Sundathelphusidae) from Luzon, Philippines

    NARCIS (Netherlands)

    Ng, P.K.L.

    1991-01-01

    The taxonomic problems concerning freshwater crabs of the genus Archipelothelphusa Bott, 1969 (Gecarcinucoidea: Sundathelphusidae) are discussed. The identity of Para-Bary-thelphusa grapsoides subsp. longipes Balss, 1937, is clarified, and a new species, A. celer spec. nov. is described from Luzon,

  17. The first finding of the crab Ctenocheles (Decapoda in Oligocene beds in Slovenia

    Directory of Open Access Journals (Sweden)

    Vasja Mikuž

    2003-06-01

    Full Text Available In the paper remains of crabs of genus Ctenocheles are discussed. They were found in the Oligocene grey marly mudstone at Čeplje at Vransko. This is the first evidence of this crab genus in Slovenia. In the Oligocene mudstone at ^eplje also numerous other fossilremains were registred, and also abundant septarian concretions.

  18. Leucosiid crabs (Crustacea: Decapoda: Brachyura) from Taiwan, with three new records.

    Science.gov (United States)

    Shih, Yi-Jia; Ho, Ping-Ho; Chan, Tin-Yam

    2015-12-01

    Four leucosiid species from Taiwan are presented. Ebalia nudipes Sakai, 1963, with its male first gonopod figured for the first time. Galilia petricola Komai & Tsuchida, 2014, is recorded on the basis of a larger specimen, and distinguishing features with its only congener, G. narusei Ng & Richer de Forges, 2007, reappraised. Nursia rhomboidalis (Miers, 1879), previously known only from Japan, Korea, and mainland China, is also recorded from Taiwan. Myra fugax (Fabricius, 1798) is now formally recorded from Taiwan, and female characters identified to help separate the three known Taiwanese species of Myra.

  19. Eight new species of the genus Sinopotamon from Jiangxi Province, China (Crustacea, Decapoda, Brachyura, Potamidae)

    NARCIS (Netherlands)

    Ai-Yun, Dai; Xian-Min, Zhou; Wei-Dong, Peng

    1995-01-01

    Fifteen species of freshwater crabs belonging to the genus Sinopotamon are recorded from Jiangxi Province, S.E. China. Eight species are new to science and these are described: S. xiushuiense, S. jiujiangense, S. wanzaiense, S. anyuanense, S. siguqiaoense, S. linhuanense, S. yushanense and S ninggan

  20. First complete mitochondrial genome of primitive crab Homologenus malayensis (Decapoda: Brachyura: Podotremata: Homolidae).

    Science.gov (United States)

    Hui, Min; Liu, Yuan; Cui, Zhaoxia

    2016-01-01

    The taxonomy and phylogeny of brachyuran crabs, and particularly of the Podotremata, have been the subjects of controversy due to their morphological diversity and complexity. The first complete mitochondrial genome (mitogenome) sequence of primitive crab Homologenus malayensis has been determined. The mitogenome is 15,793 bp in length, with A + T content 71.7%. The gene content and order are consistent with those in typical brachyuran crabs. A putative control region of 883 bp is identified due to its position (between srRNA and tRNA(Ile)) and AT richness (75.5%). Notably, the control region in H. malayensis contains nine identical specific repeat units of 42 bp and 11 identical repeat units of 2 bp with a total length of 400 bp, which is different from other crabs. These results are expected to provide useful information on both genomics and the future phylogenetic study of primitive crabs.

  1. Evolutionary history of true crabs (Crustacea: Decapoda: Brachyura) and the origin of freshwater crabs.

    Science.gov (United States)

    Tsang, Ling Ming; Schubart, Christoph D; Ahyong, Shane T; Lai, Joelle C Y; Au, Eugene Y C; Chan, Tin-Yam; Ng, Peter K L; Chu, Ka Hou

    2014-05-01

    Crabs of the infra-order Brachyura are one of the most diverse groups of crustaceans with approximately 7,000 described species in 98 families, occurring in marine, freshwater, and terrestrial habitats. The relationships among the brachyuran families are poorly understood due to the high morphological complexity of the group. Here, we reconstruct the most comprehensive phylogeny of Brachyura to date using sequence data of six nuclear protein-coding genes and two mitochondrial rRNA genes from more than 140 species belonging to 58 families. The gene tree confirms that the "Podotremata," are paraphyletic. Within the monophyletic Eubrachyura, the reciprocal monophyly of the two subsections, Heterotremata and Thoracotremata, is supported. Monophyly of many superfamilies, however, is not recovered, indicating the prevalence of morphological convergence and the need for further taxonomic studies. Freshwater crabs were derived early in the evolution of Eubrachyura and are shown to have at least two independent origins. Bayesian relaxed molecular methods estimate that freshwater crabs separated from their closest marine sister taxa ~135 Ma, that is, after the break up of Pangaea (∼200 Ma) and that a Gondwanan origin of these freshwater representatives is untenable. Most extant families and superfamilies arose during the late Cretaceous and early Tertiary.

  2. Morphology of the female reproductive system of European pea crabs (Crustacea, Decapoda, Brachyura, Pinnotheridae).

    Science.gov (United States)

    Becker, Carola; Brandis, Dirk; Storch, Volker

    2011-01-01

    Commensal pea crabs inhabiting bivalves have a high reproductive output due to the extension andfecundity of the ovary. We studied the underlying morphology of the female reproductive system in the Pinnotheridae Pinnotheres pisum, Pinnotheres pectunculi and Nepinnotheres pinnotheres using light microscopy and transmission electron microscopy (TEM). Eubrachyura have internal fertilization: the paired vaginas enlarge into storage structures, the spermathecae, which are connected to the ovaries by oviducts. Sperm is stored inside the spermathecae until the oocytes are mature. The oocytes are transported by oviducts into the spermathecae where fertilization takes place. In the investigated pinnotherids, the vagina is of the "concave pattern" (sensu Hartnoll1968): musculature is attached alongside flexible parts of the vagina wall that controls the dimension of its lumen. The genital opening is closed by a muscular mobile operculum. The spermatheca can be divided into two distinct regions by function and morphology. The ventral part includes the connection with vagina and oviduct and is regarded as the zone where fertilization takes place. It is lined with cuticle except where the oviduct enters the spermatheca by the "holocrine transfer tissue." At ovulation, the oocytes have to pass through this multilayered glandular epithelium performing holocrine secretion. The dorsal part of the spermatheca is considered as the main sperm storage area. It is lined by a highly secretory apocrine glandular epithelium. Thus, two different forms of secretion occur in the spermathecae of pinnotherids. The definite role of secretion in sperm storage and fertilization is not yet resolved, but it is notable that structure and function of spermathecal secretion are more complex in pinnotherids, and probably more efficient, than in other brachyuran crabs.

  3. Histological Description of Gonadal Development of Females and Males of Callinectes sapidus Rathbun, 1896 (Decapoda: Portunidae).

    Science.gov (United States)

    Carvalho-Saucedo, Liliana; Ramírez-Santiago, Cecilia; Pérez, Carlos

    2015-04-01

    This paper describes the characteristics of male and female germ cells during gonadal development and the gonadal maturity scale of the blue crab, Callinectes sapidus. A total of 20 specimens were collected monthly from June to November 2012, in two areas off the coast of the Gulf of Mexico: the San Andrés Lagoon and Alvarado Lagoon. The gonads were removed and processed following the standard technique of hematoxylin and eosin staining. An important event in oogenesis (pre-vitellogenesis) was the appearance of a perinuclear vesicle in the cytoplasm and the accumulation of yolk granules. Later, vitellogenesis began and there was an accumulation of nutritive droplets and fragmentation of the perinuclear vesicle. During spermatogenesis, the accumulation of two fluids was observed that were involved in the formation of the spermatophore and the delay of spermiogenesis. Based on the histological features of gonad maturity, five stages were described (inactive, early gametogenesis, development, maturity, and resorption), in females and males. This proposal can be useful for the study of reproductive seasonality of this species.

  4. Nursery performance of the pink shrimp Farfantepenaeus paulensis (Crustacea: Decapoda: Penaeidae postlarvae in different salinities

    Directory of Open Access Journals (Sweden)

    Rafael F. Costa

    2010-06-01

    Full Text Available Nursery performance, development, and RNA:DNA ratio were investigated in Farfantepenaeus paulensis (Pérez-Farfante, 1967 postlarvae acclimated from a salinity of 30‰ to higher (35‰ or lower (16, 22 and 29‰ salinities and reared for 20 days. Overall, higher final weight, yield and growth rate were observed at a salinity of 29‰. RNA:DNA ratio indicated reduced growth potential at a salinity of 35‰. Low salinities resulted in more developed individuals. Thus, early postlarval F. paulensis should not be stocked in salinities higher than that of the original hatchery, otherwise in lower salinities postlarvae should be older and/or have an extended nursery phase. Results may assist in the development of nursery rearing protocols for F. paulensis, an alternative species for aquaculture in subtropical areas.

  5. Breeding period in the mangrove crab Goniopsis cruentata (Decapoda: Grapsidae in Northeast Brazil

    Directory of Open Access Journals (Sweden)

    José Jonathas Pereira Rodrigues de Lira

    2013-03-01

    Full Text Available The brachyuran crabs are iteroparous species which present a high diversification of reproduction patterns, which may have evolved as a species-specific response to environmental conditions. Tropical species commonly present a year-round reproduction due to stable environment conditions. Goniopsis cruentata is a crab species widely distributed along the Western Atlantic, inhabiting practically every microhabitat in the mangrove ecosystem. The aim of the present study is to determine the breeding period of the crab Goniopsis cruentata in Northeastern Brazil and also to evaluate the influence of water salinity, rainfall and air and water temperature on it. A total of 71 ovigerous females, captured from August-2007 to July-2008, were used to assess the breeding period of this species. It was analyzed by the monthly proportion of ovigerous females. A correlation was applied to verify the influence of the abiotic factors on the breeding period. The present population bred seasonal-continuously with peaks in the dry period, which was not associated with monthly variations of salinity, rainfall and air and water temperatures. Therefore, according to statistical analyses, our hypothesis was refuted. However, breeding was intensified in the dry period, when salinity and temperatures were higher and rainfall was lower. We conclude that, even though breeding is not related to monthly variation of environmental factors, it occurs in periods of higher salinity and temperatures and lower rainfall.Los cangrejos Brachyura son especies iteróparas, que presentan alta diversificación en los patrones de reproducción, que pueden haber evolucionado como una respuesta específica de la especie a las condiciones ambientales. Las especies tropicales frecuentemente presentan una reproducción en todo el año debido a las condiciones estables del medio. El cangrejo Goniopsis cruentata es una especie ampliamente distribuida en largo del Atlántico occidental, y que habita prácticamente cada micro-hábitat en el ecosistema de manglar. El objetivo del presente estudio fue evaluar el periodo de reproducción del cangrejo G. cruentata en el noreste de Brasil. Un total de 71 hembras ovadas, fueron capturadas entre agosto 2007 y julio 2008, y utilizadas para obtener el periodo de reproducción de esta especie. Nuestra hipótesis es que, ya que las zonas tropicales no presentan gran variación de las temperaturas, las oscilaciones temporales de la salinidad son el principal factor que influye en la actividad reproductiva de G. cruentata. Se analizó el período reproductivo mediante la proporción mensual de hembras ovadas. Una correlación fue aplicada para evaluar la influencia de los factores abióticos limitantes (salinidad, pluviosidad, temperatura del aire y del agua en la época de crianza. La población se reproduce continuamente con picos estacionales en el período seco, lo que no fue asociado a las variaciones mensuales de salinidad, precipitación y temperatura del aire y del agua. Por lo tanto, nuestra hipótesis fue refutada. Sin embargo, la reproducción se intensificó en el período seco, cuando la salinidad y las temperaturas fueron más altas y la precipitación fue menor. Se concluye que, a pesar de que la reproducción no está relacionada con la variación mensual de los factores ambientales limitantes, ella ocurre en períodos de mayor salinidad y temperatura, y baja precipitación.

  6. New record of Clypeasterophilus stebbingi (Rathbun, 1918 (Decapoda: Brachyura: Pinnotheridae from the east coast of Nicaragua

    Directory of Open Access Journals (Sweden)

    Michel E. Hendrickx

    Full Text Available The pinnotherid crab Clypeasterophilus stebbingi (Rathbun, 1918, previously known from Florida, USA, Colombia and Brazil, is reported for the first time from Central America, on the east coast of Nicaragua. A single female specimen was collected on the sand dollar Clypeaster subdepressus (Gray, 1825, at 4 m depth, among turtle grass on sandy bottom. The specimen fits well with the description provided by M.J. Rathbun and observations made on photographs of the male holotype. Comparison of the material described from Florida (including the type material, Colombia and Brazil to the Nicaragua specimen, however, indicates that C. stebbingi shows some variation in the shape of the third maxilliped.

  7. Chemosensory neurons in the mouthparts of the spiny lobsters Panulirus argus and Panulirus interruptus (Crustacea : Decapoda)

    DEFF Research Database (Denmark)

    Garm, Anders Lydik; Shabani, Shkelzen; Høeg, Jens Thorvald

    2005-01-01

    in the mouthparts had concentration-dependent responses, with thresholds between 10-7 and 10-4 M and without saturation even at 10-3 or 10-2 M. They also quickly adapted when exposed to their best compounds at 10-4 and 10-3 M. A comparison of the response properties of these neurons in the mouthparts with those...... detection by the antennae, precise location and collection by the pereiopods, and detailed assessment of quality by the mouthparts....

  8. Natural Diet of Callinectes ornatus Ordway, 1863 (Decapoda, Portunidae in the Itapocoroy Inlet, Penha, SC, Brazil

    Directory of Open Access Journals (Sweden)

    Branco Joaquim Olinto

    2002-01-01

    Full Text Available From January to December 1995, 332 individuals of the Callinectes ornatus species were collected from the Itapocoroy inlet in Penha, Sta. Catarina, Brazil to study its natural diet and the seasonal variations of diet. Results showed a diversified trophic spectrum with a generalized dietary strategy comprising the algae, macrophyta, foraminiferida, mollusca, polychaeta, crustacea, echinodermata, Osteichthyes and NIOM (Nonidentified Organic Matter groups.

  9. Multiple drivers of decline in the global status of freshwater crayfish (Decapoda: Astacidea).

    Science.gov (United States)

    Richman, Nadia I; Böhm, Monika; Adams, Susan B; Alvarez, Fernando; Bergey, Elizabeth A; Bunn, John J S; Burnham, Quinton; Cordeiro, Jay; Coughran, Jason; Crandall, Keith A; Dawkins, Kathryn L; DiStefano, Robert J; Doran, Niall E; Edsman, Lennart; Eversole, Arnold G; Füreder, Leopold; Furse, James M; Gherardi, Francesca; Hamr, Premek; Holdich, David M; Horwitz, Pierre; Johnston, Kerrylyn; Jones, Clive M; Jones, Julia P G; Jones, Robert L; Jones, Thomas G; Kawai, Tadashi; Lawler, Susan; López-Mejía, Marilu; Miller, Rebecca M; Pedraza-Lara, Carlos; Reynolds, Julian D; Richardson, Alastair M M; Schultz, Mark B; Schuster, Guenter A; Sibley, Peter J; Souty-Grosset, Catherine; Taylor, Christopher A; Thoma, Roger F; Walls, Jerry; Walsh, Todd S; Collen, Ben

    2015-02-19

    Rates of biodiversity loss are higher in freshwater ecosystems than in most terrestrial or marine ecosystems, making freshwater conservation a priority. However, prioritization methods are impeded by insufficient knowledge on the distribution and conservation status of freshwater taxa, particularly invertebrates. We evaluated the extinction risk of the world's 590 freshwater crayfish species using the IUCN Categories and Criteria and found 32% of all species are threatened with extinction. The level of extinction risk differed between families, with proportionally more threatened species in the Parastacidae and Astacidae than in the Cambaridae. Four described species were Extinct and 21% were assessed as Data Deficient. There was geographical variation in the dominant threats affecting the main centres of crayfish diversity. The majority of threatened US and Mexican species face threats associated with urban development, pollution, damming and water management. Conversely, the majority of Australian threatened species are affected by climate change, harvesting, agriculture and invasive species. Only a small proportion of crayfish are found within the boundaries of protected areas, suggesting that alternative means of long-term protection will be required. Our study highlights many of the significant challenges yet to come for freshwater biodiversity unless conservation planning shifts from a reactive to proactive approach.

  10. First Record of Aliaporcellana and Lissoporcellana (Crustacea: Decapoda: Porcellanidae from Korea

    Directory of Open Access Journals (Sweden)

    Lee, Sanghui

    2015-07-01

    Full Text Available Two porcelain crab species, Aliaporcellana pygmaea (De Man, 1902 and Lissoporcellana nakasonei (Miyake, 1978, are reported here for the first time from Korean waters based on specimens collected from Jeju Island, Korea. The genus Aliaporcellana Nakasone and Miyake, 1969, and Lissoporcellana Haig, 1978 are also reported here for the first time in Korea. Aliaporcellana pygmaea has a wide distribution. The specimen reported here is the most northern record of this species. While, Lissoporcellana nakasonei, associated with anthozoans, was known for distributing range from New Caledonia to southern Japan. As a result, the distribution rage of L. nakasonei is changed to Korea. Now, 12 species of porcelain crabs have been reported in Korean waters.

  11. The conservation and status of Orconectes (faxonius) indianensis hay (Decapoda: cambaridae)

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The Indiana crayfish Orconectes indianensis is endemic to southeastern Illinois and southwestern Indiana in the central United States. Previous studies have...

  12. Presence of the Japanese Freshwater Prawn Macrobrachium Nipponense (De Haan, 1849) (Decapoda: Caridea: Palaemonidae) in Singapore

    NARCIS (Netherlands)

    Chong, S.S.C.; Khoo, H.W.; Ng, P.K.L.

    1987-01-01

    Characters of adults and larvae are given to differentiate between Macrobrachium nipponense and M. sintangense. The presence of the former in Singapore is stated and explained as an introduction from Japan or China, possibly with ornamental fishes.

  13. Structural changes of oviduct of freshwater shrimp, Macrobrachium nipponense (Decapoda, Palaemonidae), during spawning

    Institute of Scientific and Technical Information of China (English)

    LU Jian-ping; ZHANG Xiao-hui; YU Xiao-yun

    2006-01-01

    The structural change of the oviduct of freshwater shrimp (Macrobrachium nipponense) during spawning was examined by electron microscopy. The oviduct wall structural characteristics seem to be influenced significantly by the spawning process. Before the parturition and ovulation, two types of epithelial cells (types Ⅰ and Ⅱ) are found in the epithelium. The free surfaces of type Ⅰ and type Ⅱ cells have very dense long microvilli. Under the type Ⅰ and type Ⅱ cells, are a relatively thick layer of secreting material and a layer of mostly dead cells. After ovulation, two other types of epithelial cells (types Ⅲ and Ⅳ) are found in the oviduct wall epithelium. The free surface of type Ⅲ cells only has short microvilli scattered on the surface. The thick layer with secreting material and the dead cell layer disappeared at this stage. In some type Ⅲ cells, the leaking out of cytoplasm from broken cell membrane led to the death of these type Ⅲ cells. The transformation of all four types of epithelial cells was in the order:Ⅳ→Ⅰ→Ⅱ→Ⅲ.

  14. Ploidy manipulation and polyploid detection in the white shrimp Litopenaeus vannamei (Boone 1931) (Decapoda, Penaeidae).

    Science.gov (United States)

    Aloise, Débora de Almeida; Maia-Lima, Francisco de Assis; de Oliveira, Ruth Medeiros; Cabral, Thiago de Melo; Molina, Wagner Franco

    2011-02-01

    Ploidy manipulation has been rarely used in the genetic improvement of cultured marine shrimps. Although polyploid induction has been proven to be successful in Penaeids, including the species Litopenaeus vannamei, the methodology still requires some improvements. In the present work, different thermal shock treatments on ploidy manipulation were tested and a protocol for detecting polyploid individuals was also established. Fertilized eggs were treated by cold (10°C) and heat (38°C) thermal shocks for 8, 12, 15, 18, 20, and 22 min to induce polyploidy. Nuclear measurements within distinct treatments revealed a significant deviation in relation to the mean diameter of nuclei in the control individuals. Triploid and tetraploid metaphases were observed within treated individuals, confirming the increase of interphasic nuclear diameter. The cold thermal shock was more efficient than the hot ones, besides leading to a higher and more homogeneous hatchery rate. A mean number of three nucleoli per nucleus were observed in diploid individuals, while treated samples usually presented up to five nucleoli per nucleus. The standardization of protocols to obtain and detect polyploid products allows further utilization of such methods on a commercial scale in order to evaluate the performance of polyploid individuals in the genetic improvement of L. vannamei.

  15. Thermal biology of the sub-polar–temperate estuarine crab Hemigrapsus crenulatus (Crustacea: Decapoda: Varunidae

    Directory of Open Access Journals (Sweden)

    Juan P. Cumillaf

    2016-03-01

    Full Text Available Optimum temperatures can be measured through aerobic scope, preferred temperatures or growth. A complete thermal window, including optimum, transition (Pejus and critical temperatures (CT, can be described if preferred temperatures and CT are defined. The crustacean Hemigrapsus crenulatus was used as a model species to evaluate the effect of acclimation temperature on: (i thermal preference and width of thermal window, (ii respiratory metabolism, and (iii haemolymph proteins. Dependant on acclimation temperature, preferred temperature was between 11.8°C and 25.2°C while CT was found between a minimum of 2.7°C (CTmin and a maximum of 35.9°C (CTmax. These data and data from tropical and temperate crustaceans were compared to examine the association between environmental temperature and thermal tolerance. Temperate species have a CTmax limit around 35°C that corresponded with the low CTmax limit of tropical species (34–36°C. Tropical species showed a CTmin limit around 9°C similar to the maximum CTmin of temperate species (5–6°C. The maximum CTmin of deep sea species that occur in cold environments (2.5°C matched the low CTmin values (3.2°C of temperate species. Results also indicate that the energy required to activate the enzyme complex (Ei involved in respiratory metabolism of ectotherms changes along the latitudinal gradient of temperature.

  16. Molecular phylogenetics of American snapping shrimps allied to Alpheus floridanus Kingsley, 1878 (Crustacea: Decapoda: Alpheidae).

    Science.gov (United States)

    Bracken-Grissom, Heather D; Robles, Rafael; Felder, Darryl L

    2014-12-17

    Widely distributed populations of the snapping shrimp, Alpheus floridanus Kinglsey, 1878, from the eastern Pacific and western and eastern Atlantic Ocean have long been suspected to represent different species due to extreme morphological variation among conspecifics. A companion study (Bracken-Grissom & Felder 2014) contains redescriptions of two western Atlantic species (A. floridanus Kingsley 1878 sensu stricto and A. platycheirus Boone, 1927), assignments of the original syntypes for A. floridanus, descriptions of three new species from the Atlantic and eastern Pacific (A. hephaestus Bracken-Grissom & Felder, 2014; A. roblesi Bracken-Grissom & Felder, 2014; A. ulalae Bracken-Grissom & Felder, 2014), and discussion of the relationship of the eastern Atlantic A. floridanus africanus Balss, 1916. The present study underpins all these findings by application of molecular phylogenetic techniques. Analysis of partial sequences of the 16S, 12S, and COI mitochondrial genes separate species throughout the eastern Pacific and the eastern and western Atlantic. Morphological comparisons suggested that the two syntypes of A. floridanus belong to different species, and molecular results in this study confirm this separation. Genetic data suggest a strong affinity between the western Atlantic A. platycheirus and the eastern Pacific A. hephaestus. Close relationships are evident between trans-Atlantic species, A. floridanus africanus and A. floridanus, a pattern also seen for other cryptic and pseudocryptic species of Alpheus. Alpheus roblesi and A. ulalae represent early-branching lineages within the complex. In some cases, molecular phylogenetic relationships between members of the A. floridanus complex can be reconciled with postulated biogeographic history.

  17. Role of maxilla 2 and its setae during feeding in the shrimp Palaemon adspersus (Crustacea: Decapoda)

    DEFF Research Database (Denmark)

    Garm, A; Hallberg, E; Høeg, J T

    2003-01-01

    The movements of the basis of maxilla 2 in Palaemon adspersus were examined using macro-video recordings, and the morphology of its setae was examined using both scanning and transmission electron microscopy. The basis of maxilla 2 performs stereotypical movements in the latero-medial plane...... and gently touches the food with a frequency of 3-5 Hz. The medial rim of the basis of maxilla 2 carries three types of seta. Type 1 is serrate, type 2 and 3 are serrulate, and type 2 has a prominent terminal pore. Type 2 is innervated by 18-25 sensory cells whose cilia protrude through the terminal pore...... and are in direct contact with the external environment. The structure of type 2 setae indicates that they are mainly gustatory, although still bimodal due to their innervation by presumed chemosensory and mechanosensory neurons. Distally, the three types of setae have a complex arrangement of the cuticle involving...

  18. Ensayo de diferentes lecitinas en la dieta de juveniles de Penaeus vannamei (Crustacea: Decapoda)

    OpenAIRE

    Re-Araujo, Ana Denisse; Acosta Ruiz, M. de Jesús

    2014-01-01

    The effect of different lecithin sources and presentations on growth, food conversion ratio and survival of P. vannamei (290 mg ± 0.02) was studied. The bioassay was designed in order to compare different dietary levels and different quality of lecithin. Squid lecithin, crude soybean (7%), deoiled soybean lecithin (3.48%) in combination with fish oil or squid neutral lipids, in a partially dilapidate formula. The isoenergetic diets were fed ad libitum to four replicate groups (tanks) of 15 sh...

  19. A phylogeny-based revision of the family Luciferidae (Crustacea: Decapoda)

    DEFF Research Database (Denmark)

    Vereshchaka, Alexander L.; Olesen, Jørgen; Lunina, Anastasia A.

    2016-01-01

    Luciferidae is a family of peculiar and widely distributed shrimps with an unclear systematic position and uncertain internal phylogeny. We undertook a phylogenetic analysis of Luciferidae based on 169 morphological characters (147 binary, 22 multistate). Several characters were based on scanning...

  20. On red coloured shrimps (Decapoda, Caridea) from tropical land-locked saltwater pools

    NARCIS (Netherlands)

    Holthuis, L.B.

    1963-01-01

    In a number of widely separated places in the tropics, both in the Atlantic and in the Indo-West Pacific, bright red coloured caridean shrimps have been reported from a most peculiar habitat. This habitat is formed by salt water pools which are seemingly shut off from the sea and are often situated

  1. The Dakoticancridae (Decapoda, Brachyura) from the Late Cretaceous of North America and Mexico

    NARCIS (Netherlands)

    Bishop, G.A.; Feldmann, R.M.; Vega, F.

    1998-01-01

    The podotrematous crab family Dakoticancridae includes four genera: Dakoticancer Rathbun, Tetracarcinus Weller, Avitelmessus Rathbun, and Seorsus Bishop, all known solely from the Late Cretaceous of North America. Lathelicocarcinus Bishop, originally referred to the family, must be reassigned. Fine

  2. Larval and postlarval stages of Atypopenaeus Alcock (Decapoda, Penaeidae: Penaeinae) from Indian Ocean

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.

    Two of the early mysis stages and an early postlarva of a species of Atypopenaeus are described here for the first time. A total of 15 specimens were obtained from the Indian Ocean during the International Indian Ocean Expedition (IIOE). The species...

  3. A new species of Achaeus Leach, 1817 (Decapoda: Brachyura: Majoidea: Inachidae from Easter Island

    Directory of Open Access Journals (Sweden)

    Peter K.L. Ng

    Full Text Available Abstract In the present paper, a new species of Achaeus Leach, 1817, is described from Easter Island and dedicated to the memory of Michael Türkay. This record represents the first inachid spider crab and the sixth endemic brachyuran to be described from the island. It can be differentiated from congeners by its relatively short carapace, with the postorbital region not elongated, the arrangement and number of tubercles on the dorsal carapace surface, prominent hepatic lobe, presence of a large anterodistal lobe on the ocular peduncle, as well as structures of the third maxilliped and ambulatory legs.

  4. New records of coral-associated crabs (Decapoda: Brachyura: Carpilioidea, Trapezoidea) from Easter Island.

    Science.gov (United States)

    Boyko, Christopher B; Mendoza, Jose C E; Castro, Peter

    2017-01-10

    A review is made of those brachyurans that are symbiotic or otherwise associated with scleractinian corals on Easter Island, southeastern Pacific Ocean. A total of seven species is reported, including three species from two families not previously known from the island. Earlier records of Trapezia are analyzed and, although as many as six species have been previously reported, we conclude that only three species are known to occur on the island with certainty.

  5. Dead shrimp blues: a global assessment of extinction risk in freshwater shrimps (Crustacea: Decapoda: Caridea).

    Science.gov (United States)

    De Grave, Sammy; Smith, Kevin G; Adeler, Nils A; Allen, Dave J; Alvarez, Fernando; Anker, Arthur; Cai, Yixiong; Carrizo, Savrina F; Klotz, Werner; Mantelatto, Fernando L; Page, Timothy J; Shy, Jhy-Yun; Villalobos, José Luis; Wowor, Daisy

    2015-01-01

    We present the first global assessment of extinction risk for a major group of freshwater invertebrates, caridean shrimps. The risk of extinction for all 763 species was assessed using the IUCN Red List criteria that include geographic ranges, habitats, ecology and past and present threats. The Indo-Malayan region holds over half of global species diversity, with a peak in Indo-China and southern China. Shrimps primarily inhabit flowing water; however, a significant subterranean component is present, which is more threatened than the surface fauna. Two species are extinct with a further 10 possibly extinct, and almost one third of species are either threatened or Near Threatened (NT). Threats to freshwater shrimps include agricultural and urban pollution impact over two-thirds of threatened and NT species. Invasive species and climate change have the greatest overall impact of all threats (based on combined timing, scope and severity of threats).

  6. The complete mitogenome of the New Zealand freshwater crayfish Paranephrops planifrons White 1842 (Crustacea: Decapoda: Parastacidae).

    Science.gov (United States)

    Lee, Yin Peng; Gan, Han Ming; Tan, Mun Hua; Lys, Isabelle; Page, Rachel; Dias Wanigasekera, Beatrice; Austin, Christopher M

    2016-09-01

    The mitogenome of Paranephrops planifrons, was obtained by next generation sequencing. This crayfish has a mitochondrial genome of 16,174 base pairs with 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs (tRNA), and a non-coding AT-rich region of 771 bp. The P. planifrons nucleotide composition is: 33.63% for T, 21.92% for C, 34.46% for A, and 9.98% for G and has a 68.09% AT bias. While the mitogenome gene order for this species is consistent with aspects of the highly distinctive parastacid crayfish mitogenome gene arrangement, it has a novel gene order involving the rearrangements of a protein coding and several tRNA genes.

  7. Desenvolvimento juvenil de Hepatus pudibundus (Herbst (Crustacea, Decapoda, Calappidae, em laboratório

    Directory of Open Access Journals (Sweden)

    Hebling Nilton José

    2003-01-01

    Full Text Available The Hepatus pudibundus (Herbst, 1785 juvenile development was studied in laboratory, under the morphological and systematical stand points. The eight early juvenile stages were obtained from larvae hatched from eggs of two ovigerous females, collected at the northern coast of the State of São Paulo, Brazil. The experiments were carried out in a climatically controlled room at 25 ± 1°C, and steady saltness of 34?. The youngs were maintened individually and food consisted of Artemia sp. nauplii and fragments of fish muscle.The first juvenile stage were particulary drawn and described. For the remaining juvenile stages the most representative frameworks were picked out, which allowed the characterization of the first eight stages. According to juvenile morphology studies, it was noted that secondary sexual characters differentation begins from the third stage.

  8. A new anchialine species of Naushonia (Decapoda: Gebiidea: Laomediidae) from the Bahamas.

    Science.gov (United States)

    Alvarez, Fernando; Iliffe, Thomas M; Villalobos, José Luis

    2017-04-27

    A new species of mud shrimp of the genus Naushonia Kingsley, 1897 is described from two anchialine caves on the island of Great Abaco in the Bahamas. Naushonia tinkeri n. sp. is the fifteenth species in the genus and the second to be described from the Bahamas. The new species is morphologically similar to N. augudrea (Juarrero & García, 1997) from Holguín Province, eastern Cuba, with which it shares a carapace with cervical and cardiac grooves; however, it can be distinguished by having a pigmented cornea, the first pereiopod with a proportionately longer propodus and dactylus without a toothed external margin, and the telson longer relative to the uropod length. The new species inhabits anchialine caves and is the largest one reported until now.

  9. Carideorum catalogus: the recent species of the dendrobranchiate, stenopodidean, procarididean and caridean shrimps (Crustacea: Decapoda)

    NARCIS (Netherlands)

    De Grave, S.; Fransen, C.H.J.M.

    2011-01-01

    A checklist of recent species of dendrobranchiate, stenopodidean, procarididean and caridean shrimps including synonyms and type localities. Also listed are unavailable names, larval names, nomina dubia and nomina nuda. A complete list of references to original descriptions of taxa listed is provide

  10. Preliminary observations on the mandibles of palaemonoid shrimp (Crustacea: Decapoda: Caridea: Palaemonoidea

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    Christopher W. Ashelby

    2015-03-01

    Full Text Available The mandibles of caridean shrimps have been widely studied in the taxonomy and functional biology of the group. Within the Palaemonoidea the mandibles reach a high level of structural diversity reflecting the diverse lifestyles within the superfamily. However, the majority of studies have been restricted to light microscopy, with the ultrastructure at finer levels poorly known. This study investigates the mandible of nine species belonging to six of the recognised families of the Palaemonoidea using SEM and analyses the results in a phylogenetic and dietary framework. The results of the study indicate that little phylogenetic information is conveyed by the structure of the mandible, but that its form is influenced by primary food sources of each species. With the exception of Anchistioides antiguensis, all species examined possessed cuticular structures at the distal end of the pars molaris (molar process. Five types of cuticular structures are recognised herein, each with a unique form, but variable in number, placement and arrangement. Each type is presumed to have a different function which is likewise related to diet.

  11. The complete mitogenome of the moon crab Ashtoret lunaris (Forskal, 1775), (Crustacea; Decapoda; Matutidae).

    Science.gov (United States)

    Tan, Mun Hua; Gan, Han Ming; Lee, Yin Peng; Austin, Christopher M

    2016-01-01

    The complete mitochondrial genome of the moon crab Ashtoret lunaris was obtained from a partial genome scan using the MiSeq sequencing system. The Ashtoret lunaris mitogenome is 15,807 base pairs in length (70% A + T content) and made up of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs, and a putative 956 bp non-coding AT-rich region. This A. lunaris mitogenome sequence is the first for the genus, as well as the family Matutidae and superfamily Calappoidea.

  12. Behaviour and time allocation of the burrowing shrimp Callianassa subterranea (Decapoda, Thalassinidea)

    NARCIS (Netherlands)

    Stamhuis, E.J; Reede-Dekker, T; van Etten, Y; de Wiljes, J.J.; Videler, J.J

    1996-01-01

    The behaviour and allocation of time of the endobenthic shrimp Callianassa subterranea from the central North Sea was studied in the laboratory. Animals were allowed to construct a two-dimensional burrow in large transparent sediment filled cuvettes tailored to their body width. The behaviour of the

  13. First occurrence of knight rock shrimp, Sicyonia lancifer (Olivier, 1811 (Decapoda: Sicyoniidae in the Mediterranean Sea.

    Directory of Open Access Journals (Sweden)

    A. PATANIA

    2014-06-01

    Full Text Available The occurrence of the non-native species Sicyonia lancifer  (Olivier, 1811 belonging to Sicyoniidae family is reported for the first time in the Mediterranean Sea. In the following  paper  the distinguishing features of the species are provided. 

  14. On a new species of Alpheus (Crustacea Decapoda, Natantia) from the Eastern Medeterranean

    NARCIS (Netherlands)

    Lewinsohn, Ch.; Holthuis, L.B.

    1978-01-01

    From 30 October to 3 November 1975 an expedition, organized by the Department of Zoology of the University of Tel-Aviv, investigated the marine fauna of the Eastern Mediterranean north of Sinai Peninsula, R.V. "Shikmona" for this purpose was kindly placed at the disposal of the expedition by the Isr

  15. Effects of temperature on cellular and biochemical parameters in the crab Carcinus aestuarii (Crustacea, Decapoda).

    Science.gov (United States)

    Matozzo, Valerio; Gallo, Chiara; Marin, Maria Gabriella

    2011-06-01

    The effects of temperature on cellular and biochemical parameters of the crab Carcinus aestuarii were evaluated. Crabs were kept for 7 days at 4, 17 (reference value) and 30 °C (salinity of 35 psu), and total haemocyte count (THC), haemocyte volume, haemocyte proliferation, phenoloxidase (PO) activity in both haemocyte lysate (HL) and cell-free haemolymph (CFH), CFH total protein and glucose levels, superoxide dismutase (SOD) and catalase (CAT) activities in both gills and digestive gland were evaluated. The lowest and the highest temperature significantly decreased THC, whereas haemocyte volume and haemolymph glucose concentration did not differ significantly among experimental conditions. Haemolymph protein concentration significantly reduced in crabs maintained at 30 °C, when compared with that of animals kept at 4 and 17 °C. Haemocyte proliferation increased significantly in crabs kept at 4 and 30 °C, when compared with that of crabs held at 17 °C. Likewise, a significantly higher PO activity was recorded in CFH from crabs kept at 4 and 30 °C, than in control crabs. Conversely, PO activity did not vary significantly in HL. With regard to antioxidant enzyme activities, a significant decrease in CAT activity was observed in gills from crabs kept at 4 °C, when compared to that of crabs kept at 17 °C and 30 °C. Results obtained demonstrated that the highest and lowest temperature tested influenced crab biological responses, and indicated that C. aestuarii modulated its cellular and biochemical parameters (mainly haemocyte proliferation, CFH protein concentrations and CFH PO activity) in order to cope with temperature. Copyright © 2011 Elsevier Ltd. All rights reserved.

  16. Effects Of Temperature On Cellular And Biochemical Parameters In The Crab Carcinus Aestuarii (Crustacea, Decapoda)

    OpenAIRE

    Matozzo, Valerio; Gallo, Chiara; Marin, Maria Gabriella

    2011-01-01

    Abstract The effects of temperature on cellular and biochemical parameters of the crab Carcinus aestuarii were evaluated. Crabs were kept for 7 days at 4, 17 (reference value) and 30 ?C (salinity of 35 psu), and total haemocyte count (THC), haemocyte volume, haemocyte proliferation, phenoloxidase (PO) activity in both haemocyte lysate (HL) and cell-free haemolymph (CFH), CFH total protein and glucose levels, superoxide dismutase (SOD) and catalase (CAT) activities in both gills and...

  17. Nutritional status of Carcinus maenas (Crustacea: Decapoda) influences susceptibility to contaminant exposure.

    Science.gov (United States)

    Dissanayake, Awantha; Galloway, Tamara S; Jones, Malcolm B

    2008-08-11

    Using the shore crab Carcinus maenas as a model, this study tested the hypothesis that nutritional status influences susceptibility of adult crabs (>60mm carapace width (CW)) to environmental contamination. In the laboratory, crabs were either starved, given a restricted diet (fed on alternate days) or fully fed (fed each day). In addition, crabs under each feeding regime were exposed to a sublethal concentration (200microgl(-1)) of pyrene (PYR) as a model organic (PAH (polyaromatic hydrocarbon)) contaminant. Various physiological end points were measured after 7 and 14 days. Results indicated that adult shore crab physiology was relatively robust to short-term (7 days) nutritional changes as multivariate analysis (ANOSIM) showed no significant difference in shore crab physiological condition between control and pyrene-exposed crabs, irrespective of dietary feeding regime [Global R=0.018, P (%)=19.2]. After 14 days, however, starved crabs showed significant impacts to physiological condition (as revealed by multivariate analysis) [Global R=0.134, P (%)=0.1], [R=0.209, P (%)=0.1]; starved individuals had significantly lower antioxidant status (F(2,48)=5.35, Pcontrol individuals (Pcontrols (Pcontrol crabs; however, after 14 days, antioxidant status (Pbiological-effects tools in environmental monitoring.

  18. First cytochemical study of haemocytes from the crab Carcinus aestuarii (Crustacea, Decapoda

    Directory of Open Access Journals (Sweden)

    V. Matozzo

    2010-03-01

    Full Text Available For the first time, a morphological study of haemocytes from the crab Carcinus aestuarii was carried out by means of light microscopy and differing cytochemical assays. Analysis of haemocyte size frequency distribution (performed by means of a Coulter Counter revealed the presence of two distinct haemocyte fractions in C. aestuarii haemolymph, depending on cell size. The first fraction was of about 3-5 µm in diameter and 30-50 fL in volume, the second was of about 6-12 µm in diameter and over 200 fL in volume. Mean cell diameter and volume were 8.20±1.7 µm and 272.30±143.5 fL, respectively. Haemocytes observed under light microscope were distinguished in three cell types: granulocytes (28%; 11.94±1.43 µm in diameter with evident cytoplasmic granules, semigranulocytes (27%; 12.38±1.76 µm in diameter with less granules than granulocytes, and hyalinocytes (44%; 7.88±1.6 µm in diameter without granules. In addition, a peculiar cell type was occasionally found (about 1%: it was 25-30 µm in diameter and had a great vacuole and a peripheral cytoplasm with granules. Granulocyte and semigranulocyte granules stained in vivo with Neutral Red, indicating that they were lysosomes. Giemsa’s dye confirmed that granulocytes and semigranulocytes were larger than hyalinocytes. Pappenheim’s panoptical staining and Ehrlich’s triacid mixture allowed to distinguish granule-containing cells (including semigranulocytes in acidophils (64%, basophils (35% and neutrophils (1%. Hyalinocytes showed always a basophilic cytoplasm. Haemocytes were positive to the PAS reaction for carbohydrates, even if cytoplasm carbohydrate distribution varied among cell types. Lastly, lipids were found on cell membrane and in cytoplasm of all haemocyte types in the form of black spots produced after Sudan Black B staining. The morphological characterisation of C. aestuarii haemocytes by light microscopy was necessary before performing both ultrastructural and functional studies of circulating cells.

  19. On Parathelphusa ceophallus spec. nov. (Crustacea: Decapoda: Brachyura: Parathelphiisidae) from Pulau Buton, Sulawesi

    NARCIS (Netherlands)

    Ng, P.K.L.

    1993-01-01

    A new species of parathelphusid freshwater crab, Parathelphusa ceophallus, is described from Pulau Buton, a small island southeast of the island of Sulawesi in Indonesia. The species is differentiated from its allies in the P. celebensis complex by the form of its anterolateral margin, postorbital c

  20. Two new species of Glyphocrangon (Decapoda: Caridea: Glyphocrangonidae) from the East China Sea and the Philippines.

    Science.gov (United States)

    Han, Qingxi; Li, Xinzheng

    2014-08-18

    The present paper reports two new species of Glyphocrangon (Crustacea, Caridea, Glyphocrangonidae) collected respectively from the East China Sea and the Philippines. G. singularis sp. nov., from the East China Sea, is similar to G. fimbriata Komai & Takeuchi, 1994 with the presence of fringe of setae on dactyl of the third to fifth pereopods, but differs from G. fimbriata by the rostrum shape and the armature on the carapace; G. denticulata sp. nov., from the Philippines, is similar to G. pugnax De Man, 1918 with the entire anterior third carina, but differs from G. pugnax by armatures of the antennal scaphocerite and carapace, the lengths of rostrum and the spines of fifth abdominal somite, and the colouration of carapace. 

  1. Caught in speciation? A new host for Conchodytes meleagrinae Peters, 1852 (Decapoda, Caridea, Palaemonidae).

    Science.gov (United States)

    Fransen, Charles H J M; Reijnen, Bastian T

    2013-01-01

    During fieldwork in 2009 at Ternate, Indonesia, a pair of a pontoniine shrimp species belonging to the genus Conchodytes was collected from a bivalve mollusk of the genus Spondylus. This constitutes the first record of a species of the genus Conchodytes associated with a spondylid host. The specimens can be distinguished from other known Conchodytes species based on both morphology and colour pattern. Its COI barcode however, strongly resembles those obtained from three specimens of C. meleagrinae and is nested in the C. meleagrinae clade of the reconstructed phylogeny. Based on morphology and colouration only the specimens associated with the Spondylus bivalve would have been described as a species new to science. The modest conflicting molecular data have lead the authors to fully describe and figure the Spondylus associated specimens and compare them with the Pinctada associated specimens. Based on the present information it is decided not to give the Spondylus associated specimens the status as a distinct species but regard them as host-related (colour)morph of Conchodytes meleagrinae.

  2. Influence of starvation and feeding on the hepatopancreas of larval Hyas araneus (Decapoda, Majidae)

    Science.gov (United States)

    Storch, V.; Anger, K.

    1983-03-01

    Zoea-1 larvae of Hyas araneus were kept under different nutritional conditions. Their midgut glands were investigated with a transmission electron microscope. The glandular epithelium consists of the cell types known from adult decapods. It is mainly the R-cell type that undergoes ultrastructural alterations which reflect nutritional conditions. R-cells of fed larvae are characterized by large lipid inclusions; after a certain period of food deprivation (point-of-no-return) the original ultrastructure cannot be reestablished. Refeeding results in large glycogen deposits in these cells.

  3. Agonistic behaviour in juvenile southern rock lobster, Jasus edwardsii (Decapoda, Palinuridae: implications for developing aquaculture

    Directory of Open Access Journals (Sweden)

    Chris Carter

    2014-11-01

    Full Text Available The Southern rock lobster, Jasus edwardsii, is a temperate species of spiny lobster with established well managed fisheries in Australia and New Zealand. It has also been under consideration as a species with aquaculture potential. Agonistic behaviour has important consequences under aquaculture conditions that encompass direct effects, such as damage or death of protagonists, and indirect effects on growth that relate to resource access, principally food and refuge. This study aimed to identify and characterize behaviours and to make a preliminary investigation of their occurrence under tank culture. Juvenile Jasus edwardsii were examined in a flow-through seawater system using a remote video camera system. Twenty-nine behaviours were divided into three sub-groups: aggressive (11, avoidance (6 and others (12. Aggressive behaviours included attacks, pushing, lifting, clasping and carrying an opponent. Avoidance behaviours included moving away in a backwards-, forwards- or side-stepping motion as well as with more vigorous tail flips. These behaviours were components of twelve behavioural groups that described contact, attack and displacement between individuals. Activity was crepuscular with two clear peaks, one in the morning and the other in the evening. The occurrence of behavioural groups was not different between the morning and evening. The frequency of aggressive behaviours was not affected by changes made to stocking density or access to food. The implications of agonistic behaviours are discussed further in relation to developing aquaculture.

  4. Progress on the fossil Xanthoidea MacLeay, 1838 (Decapoda, Brachyura)

    NARCIS (Netherlands)

    Schweitzer, Carrie E.

    2003-01-01

    Identification and utilization of proxy characters in extant families has been accomplished with success for fossil members of the Calappidae, Hepatidae, Necrocarcinidae, Matutidae, and Hexapodidae. The fossil and extant Raninidae have been revised using primarily hard-part morphology preserved in t

  5. On the larval genus Problemacaris Stebbing, and its probable identity (Crustacea, Decapoda)

    NARCIS (Netherlands)

    Gordon, I.

    1964-01-01

    INTRODUCTION After the manuscript of my paper on Problemacaris (Gordon, 1960), had gone to press, Dr. R. B. Pike sent me notes and drawings of a larva that had been obtained by the "Sarsia" on 14 November 1957 and which he and Dr. D. I. Williamson had examined. When I told these two zoologists that

  6. EFFECTS OF TEMPERATURE AND Ca2+ ON THE LARVAL DEVELOPMENT OF THE DECAPODA CRUSTACEAN: ERIOCHEIR SINENSIS

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    With increasing demand in China for the mitten crab larvae, understanding its survival mechanism gets more important. This research focused on the effects of temperature and Ca2+ on the larval growth and development. Eriocheir sinensis larvae were reared in laboratory under 21 different combinations of temperature (15, 20, 25℃) and Ca2+ content (120, 130, 140, 150, 160, 170, 180 mg/l) and constant salinity (20) and pH (8). The results suggested that the survival rate increases with temperature and Ca2+ content. These combinations of temperature and Ca2+ content maximized survival rate in our study and it may be the optimum water environmental conditions for culturing the larvae. To predict surviving larvae number under different water environmental conditions, 21 dynamic mathematical models were developed. This for the first time observation of the zoeal Ⅵ larvae of the Changjiang River E. sinensis population showed that they occurred under stressed water environmental conditions: temperature of 15℃ and Ca2+ content of 120,130 mg/l.

  7. Distribución del cangrejo rojo Procambarus clarkii Girard, 1859 (Decapoda, Cambaridae en Extremadura

    Directory of Open Access Journals (Sweden)

    Cascos, G.

    2000-12-01

    Full Text Available This paper presents the distribution of red swamp crayfish in Extremadura based in samplings carried out in 407 grid cells (10 x 10 km derived from the standard UTM map. Red swamp crayfish was found in 69.77% of sites surveyed. Thus this species inhabits in practically all region except for areas higher than 750 m of altitude. Males outnumbered females for all size classes. Sex ratio was 1.41:1.En este trabajo se presenta la distribución del cangrejo rojo en Extremadura en base a los muestreos realizados en 407 cuadrículas de 10 x 10 km, habiendo sido detectado en 69.77% de las cuadrículas prospectadas, por lo que llega a ocupar la casi totalidad de la región con excepción de las zonas con altitudes superiores a 750 m. En todas las clases de talla analizadas predominan los machos sobre las hembras en una relación 1.41:1.

  8. Multiple host switching events shape the evolution of symbiotic palaemonid shrimps (Crustacea: Decapoda).

    Science.gov (United States)

    Horká, Ivona; De Grave, Sammy; Fransen, Charles H J M; Petrusek, Adam; Ďuriš, Zdeněk

    2016-06-01

    The majority of the almost 1,000 species of Palaemonidae, the most speciose family of caridean shrimp, largely live in symbioses with marine invertebrates of different phyla. These associations range from weak epibiosis to obligatory endosymbiosis and from restricted commensalism to semi-parasitism, with the specialisation to particular hosts likely playing a role in the diversification of this shrimp group. Our study elucidates the evolutionary history of symbiotic palaemonids based on a phylogenetic analysis of 87 species belonging to 43 genera from the Indo-West Pacific and the Atlantic using two nuclear and two mitochondrial markers. A complementary three-marker analysis including taxa from GenBank raises this number to 107 species from 48 genera. Seven larger clades were recovered in the molecular phylogeny; the basal-most one includes mostly free-living shrimp, albeit with a few symbiotic species. Ancestral state reconstruction revealed that free-living forms likely colonised cnidarian hosts initially, and switching between different host phyla occurred multiple times in palaemonid evolutionary history. In some cases this was likely facilitated by the availability of analogous microhabitats in unrelated but morphologically similar host groups. Host switching and adaptations to newly colonised host groups must have played an important role in the evolution of this diverse shrimp group.

  9. Etisus evamuellerae, a new xanthid crab (Decapoda, Brachyura) from the Middle Miocene of Austria and Hungary

    Science.gov (United States)

    Hyžný, M.; van Bakel, B.W.M.; Guinot, D.

    2015-01-01

    On the basis of several carapaces, a new species of xanthid crab, Etisus evamuellerae, is described from the Middle Miocene of the Vienna (Austria) and Great Hungarian basins. It differs from the coeval xanthids, Xantho moldavicus and Pilodius vulgaris, in having a distinctly protruding front and comparatively longer carapace. Contrary to those two species, the new one makes up for just a small percentage in the decapod crustacean assemblages studied. PMID:25983383

  10. [Nutrition of juvenile prawn Macrobrachium carcinus (Crustacea: Decapoda) with diets of vegetable and marine residues].

    Science.gov (United States)

    Casas-Sánchez, R; Vaillard-Nava, Y; Re-Araujo, A D

    1995-01-01

    Juvenile prawn Macrobrachium carcinus were fed two different diets: restaurant by-products (diet I) and fish and vegetable market by-products (diet II). These diets were evaluated by proximal analysis, assimilation efficiency and the factor conversion rate (FCR). Diet I registered a higher efficiency, but there was no difference in the growth rate. The growth mean (G. L.) for three months was 0.254 +/- 0.13 cm (diet I) and 0.191 +/- 0.1 cm (diet II). The conversion rate was good for both, suggesting that 6 to 7 kg of food are needed to obtain 1 kg of prawn. Survival was 76% and 100% for diets I and II, respectively.

  11. New record of the genus Phycocaris Kemp, 1916 (Decapoda: Caridea: Hippolytidae) from Hainan Island, China

    Science.gov (United States)

    Gan, Zhibin; Li, Xinzheng

    2017-05-01

    The monotypic genus Phycocaris Kemp, 1916, which was established based on material from the Indian Ocean and previously only known from the type localities, Australia and Japan, is now newly recorded from the South China Sea. A detailed description of Phycocaris simulans Kemp, 1916 based on the specimen collected from Hainan Island is presented. Specific features and the differences between the Indian Ocean and the present material are described.

  12. New records of Decapod Crustaceans (Decapoda: Pontoniinae and Inachidae associated with sea anemones in Turkish waters

    Directory of Open Access Journals (Sweden)

    Z. DURIS

    2013-10-01

    Full Text Available Three anemone-associated decapod crustaceans, two shrimp species, Periclimenes amethysteus and P. aegylios (Caridea: Palaemonidae: Pontoniinae, and the crab Inachus phalangium (Brachyura: Inachidae, all collected from the Dardanelles, are reported for the first time from Turkish coasts. Another inachid crab, Macropodia czernjawskii is also reported for the first time to occur in association with the sea anemone, Anemonia viridis. Periclimenes scriptus was the fifth decapod species recorded associated with sea anemones within the present study, and while this species has already been reported from Turkish waters, this is the first time it is recorded from the Dardanelles (the Turkish Straits System.

  13. A new snapping shrimp (Crustacea Decapoda, Alpheidae, Alpheus) from the estuarine mudflats of Kuwait

    NARCIS (Netherlands)

    Anker, A.; Grave, De S.

    2009-01-01

    A new snapping shrimp, Alpheus lutosus spec. nov., is described from the intertidal mudflats of Bubiyan Island, northern Kuwait, south of the vast Shatt-Al-Arab delta. The new species appears to be closely related to Alpheus hoplocheles Coutière, 1897 from similar estuarine habitats in China and Jap

  14. Comparison of some reproductive characteristics of farmed and wild white shrimp males Litopenaeus vannamei (Decapoda: Penaeidae

    Directory of Open Access Journals (Sweden)

    Sergio Rendón Rodríguez

    2007-03-01

    Full Text Available We rated some reproductive characteristics of white shrimp Litopenaeus vannamei (Boone, 1931 males using 46 farmed individuals (weighing 21.42±0.56 g and 40 wild individuals (weighing 36.10±0.72 g. In farmed shrimps, spermatophore mean weight was 8.94±0.51 mg; total mean sperm count was 3.90±0.27 x 10(6 in each spermatophore; and mean percentage of normal sperm was 86.9±0.37 %. In wild individuals, the respective values were 30.68±2.32 mg; 6.22±1.09 x 10(6; and 62.1±3.56 %. In both groups, the differences between right and left spermatophore were not significant (pResumen Se evaluaron características reproductivas como peso del espermatóforo, número de espermatozoides y porcentaje de espermatozoides normales en 86 organismos de camarón blanco (Litopenaeus vannamei. de éstos, 46 individuos provinieron de estanques de cultivo con un peso de 21.42±0.56 g y el resto, 40, silvestres con un peso de 36.10±0.72 g. En los camarones cultivados, el peso de los espermatóforos fue de 8.94±0.51 mg; el número total de espermatozoides en cada espermatóforo fue de 3.90±0.27 x 10(6; y el porcentaje de espermatozoides normales fue de 86.9±0.37 %. En los silvestres, los valores respectivos fueron de 30.68±2.32 mg; 6.22±1.09 x 10(6; y 62.1±3.56 %. En ambos grupos, las diferencias entre los espermatóforos derecho e izquierdo no fueron estadísticamente diferentes (p<0.01. Las diferencias en el peso de los espermatóforos y el porcentaje de espermatozoides normales, entre los camarones cultivados y silvestres, fueron significativas (p<0.01; sin embargo, en el número de espermatozoides tales diferencias no fueron significativas (p<0.01. La relación entre el peso del espermatóforo (Ws y el peso de los individuos (Wo fue Ws (mg=1.23(Wo-17.34 (r²=0.89, en camarones cultivados; y Ws (mg=2.57(Wo-60.04 (r²=0.64, en los silvestres. En organismos cultivados, la relación entre el número de espermatozoides (Cs y el peso de los individuos (Wo fue Cs(*10(6=1.13*10-4* (Wo 3.361 (r²=0.85; y entre el peso de los espermatóforos fue Cs(*10(6=0.439* (Ws 0.984 (r²=0.90. En el caso de los organismos silvestres, no hubo correlación. La proporción de esperma normal varió de 79.8 a 95.2 % (86.9±0.37 % y de 14.0 a 91.5 % (62.1±2.52 %, en camarones cultivados y silvestres, respectivamente. Las anormalidades más frecuentes tanto en los cultivados como en los silvestres fueron esperma sin spike (49.3 % y 76.6 %, respectivamente y los de forma irregular (35.8 % y 17.7 %. Las presencias menos frecuentes fueron las de spike torcido (10.2 % y 4.29 % y doble (4.7 % y 1.41 %.

  15. On a new species of Alpheus (Crustacea Decapoda, Natantia) from the Eastern Medeterranean

    NARCIS (Netherlands)

    Lewinsohn, Ch.; Holthuis, L.B.

    1978-01-01

    From 30 October to 3 November 1975 an expedition, organized by the Department of Zoology of the University of Tel-Aviv, investigated the marine fauna of the Eastern Mediterranean north of Sinai Peninsula, R.V. "Shikmona" for this purpose was kindly placed at the disposal of the expedition by the

  16. On red coloured shrimps (Decapoda, Caridea) from tropical land-locked saltwater pools

    NARCIS (Netherlands)

    Holthuis, L.B.

    1963-01-01

    In a number of widely separated places in the tropics, both in the Atlantic and in the Indo-West Pacific, bright red coloured caridean shrimps have been reported from a most peculiar habitat. This habitat is formed by salt water pools which are seemingly shut off from the sea and are often situated

  17. Shrimps down under: evolutionary relationships of subterranean crustaceans from Western Australia (Decapoda: Atyidae: Stygiocaris.

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    Timothy J Page

    Full Text Available BACKGROUND: We investigated the large and small scale evolutionary relationships of the endemic Western Australian subterranean shrimp genus Stygiocaris (Atyidae using nuclear and mitochondrial genes. Stygiocaris is part of the unique cave biota of the coastal, anchialine, limestones of the Cape Range and Barrow Island, most of whose nearest evolutionary relations are found in coastal caves of the distant North Atlantic. The dominance of atyids in tropical waters and their food resources suggest they are pivotal in understanding these groundwater ecosystems. METHODOLOGY/PRINCIPLE FINDINGS: Our nuclear and mitochondrial analyses all recovered the Mexican cave genus Typhlatya as the sister taxon of Stygiocaris, rather than any of the numerous surface and cave atyids from Australia or the Indo-Pacific region. The two described Stygiocaris species were recovered as monophyletic, and a third, cryptic, species was discovered at a single site, which has very different physiochemical properties from the sites hosting the two described species. CONCLUSIONS/SIGNIFICANCE: Our findings suggest that Stygiocaris and Typhlatya may descend from a common ancestor that lived in the coastal marine habitat of the ancient Tethys Sea, and were subsequently separated by plate tectonic movements. This vicariant process is commonly thought to explain the many disjunct anchialine faunas, but has rarely been demonstrated using phylogenetic techniques. The Cape Range's geological dynamism, which is probably responsible for the speciation of the various Stygiocaris species, has also led to geographic population structure within species. In particular, Stygiocaris lancifera is split into northern and southern groups, which correspond to population splits within other sympatric subterranean taxa.

  18. Multiple drivers of decline in the global status of freshwater crayfish (Decapoda:Astacidea)

    Science.gov (United States)

    Nadia I. Richman; Monika Böhm; Susan B. Adams; Fernando Alvarez; Elizabeth A. Bergey; John J. S. Bunn; Quinton Burnham; Jay Cordeiro; Jason Coughran; Keith A. Crandall; Kathryn L. Dawkins; Robert J. DiStefano; Niall E. Doran; Lennart Edsman; Arnold G. Eversole; Leopold Füreder; James M. Furse; Francesca Gherardi; Premek Hamr; David M. Holdich; Pierre Horwitz; Kerrylyn Johnston; Clive M. Jones; Julia P. G. Jones; Robert L. Jones; Thomas G. Jones; Tadashi Kawai; Susan Lawler; Marilu López-Mejía; Rebecca M. Miller; Carlos Pedraza-Lara; Julian D. Reynolds; Alastair M. M. Richardson; Mark B. Schultz; Guenter A. Schuster; Peter J. Sibley; Catherine Souty-Grosset; Christopher A. Taylor; Roger F. Thoma; Jerry Walls; Todd S. Walsh; Ben Cohen

    2015-01-01

    Rates of biodiversity loss are higher in freshwater ecosystems than in most terrestrial or marine ecosystems, making freshwater conservation a priority. However, prioritization methods are impeded by insufficient knowledge on the distribution and conservation status of freshwater taxa, particularly invertebrates. We evaluated the extinction risk of the world’s 590...

  19. Nauplii production of white shrimp, Litopenaeus vannamei (Decapoda: Penaeidae, on-board of commercial trawlers

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    Carlos E Medina-Reyna

    1999-12-01

    Full Text Available Los laboratorios no han logrado producir suficientes nauplios de buena calidad por lo que sigue siendo necesario recolectar hembras maduras en alta mar. Sin embargo, no siempre se recolectan hembras en la condición inseminada. En este estudio, se evaluó la recolecta de hembras y producción de nauplios abordo de un barco camaronero durante un viaje comercial como una alternativa para el larvicultivo de Litopenaeus vannamei en el Golfo de Tehuantepec. Se efectuaron arrastres en la tarde hasta el anochecer. El mejor tiempo de arrastre fue de 20 min y produjo una captura media de 37 + 8 camarones adultos con una sobrevivencia de 72 + 3 %. Se observaron desoves desde las 11:00 PM hasta las 02:00 AM, con un máximo a las 12:00 PM. Se siguieron 14 desoves en cinco días, durante los cuales se produjeron 2.2 x 106 nauplios con una tasa media de fertilidad y de eclosión de 83 y 75 %, respectivamente. Este trabajo presenta una técnica que puede proveer de simientes para el larvicultivo a partir de los productos reproductivos de camarones capturados por la flota camaronera comercial.

  20. [Dana swimming crab growth Callinectes danae (Decapoda: Portunidae) from Margarita Island, Venezuela].

    Science.gov (United States)

    Castillo, Jesylén; Eslava, Nora; González, Leo Walter

    2011-12-01

    Callinectes danae is a common species captured with crab traps in nearby areas of coastal lagoons in Margarita Island. Although its considerable economic importance as a fishery resource, few studies have been done on population dynamics and its fishery potential in local coastal environments to support decision making in fishery administration. We present growth pattern details of Callinectes danae to better estimate its population size and exploitation feasibility. For this, we analyzed a total of 3 623 specimens that were monthly captured in crab pots by artisanal fishermen in Las Marites lagoon, from October 2007 to September 2008. The length-weight ratio was determined, and growth parameters estimated from both length and weight curves of the von Bertalanffy model. The general sex ratio showed no significant difference between males and females (chi2 = 0.04, p > 0.05). However, values of slopes b between males and females were significantly different (t(s) = 2.75, p danae is a species with short lifespan and moderately rapid growth. The coefficient of variation values (CV), of the phi-prime growth performance index (Ø'), showed a different growth pattern compared to those obtained in other regions. We propose that a management strategy will be the periodical review of the minimum capture size for fishing area, after the great variability found in growth parameters.

  1. On the taxonomy and distribution of Callinectes Stimpson (Crustacea, Decapoda, Portunidae in Rio Grande do Norte

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    C. Sankarankutty

    1991-01-01

    Full Text Available A faunistic survey of the species of Callinectes Stimpson, 1871 carried out in the coastal and estuarine regions of the State of Rio Grande do Norte yielded five species: C. bocourti A. Milne Edwards, 1879; C. danae Smith, 1869; C. exasperatus (Gerstaecker, 1856; C. larvatus Ordway, 1863 and C. ornatus Ordway, 1863. Specimens examined consist of those collected on a monthly basis from three fixed stations within the estuary of Potengi, Natal during a period of two years and those obtained from other localities. Among the species occuring in the region, C. danae is more abundant and has a wider range of tolerance of salinity while C. larvatus is restricted to the marine habitat. Though C. danae sustains important artisan fishery, C. bocourti of large size also contribute to the fishery.

  2. Description of laboratory reared first zoea of Callinectes danae Smith (Crustacea, Decapoda, Portunidae

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    Cheruparambil Sankarankutty

    1999-01-01

    Full Text Available A detailed description of laboratory reared first zoea larva of Callinectes danae Smith, 1869 is given. The larvae utilized for this study were reared in vitro in a special incubator. A comparison with larvae of other species is also attempted.

  3. Juvenile development of Callinectes danae Smith, 1869 (Crustacea, Decapoda, Brachyura, Portunidae) under laboratory conditions.

    Science.gov (United States)

    Bolla, Eduardo A; Fransozo, Vivian; Negreiros-Fransozo, Maria Lucia

    2014-03-01

    The juvenile development of Callinectes danae was investigated from megalopae obtained in neuston samples at Ubatuba, São Paulo, Brazil. The individuals were raised in the laboratory under constant temperature (25 ± 1°C), filtered sea water from the collection location (35‰), and natural photoperiod. Newly hatched Artemia sp. nauplii were offered as food on a daily basis and ornamental-fish food was also provided for the juveniles from the 4th stage on. Twelve stages of the juvenile phase were obtained. The main morphological features that allowed recognition of the first juvenile stage were drawn and described. All the subsequent stages obtained were examined and measured, and the main changes in relation to the first stage were recorded. Sexual dimorphism becomes apparent from the fourth juvenile stage onwards. Some appendages and morphological features proved to be of great importance in the identification of species, including the number of segments of the antennal flagellum and the number of setae on the maxilla and on the 1st, 2nd and 3rd maxillipeds. These can probably be used for future comparisons and species identifications.

  4. Juvenile development of Callinectes danae Smith, 1869 (Crustacea, Decapoda, Brachyura, Portunidae under laboratory conditions

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    EDUARDO A. BOLLA Jr

    2014-03-01

    Full Text Available The juvenile development of Callinectes danae was investigated from megalopae obtained in neuston samples at Ubatuba, São Paulo, Brazil. The individuals were raised in the laboratory under constant temperature (25 ± 1°C, filtered sea water from the collection location (35‰, and natural photoperiod. Newly hatched Artemia sp. nauplii were offered as food on a daily basis and ornamental-fish food was also provided for the juveniles from the 4th stage on. Twelve stages of the juvenile phase were obtained. The main morphological features that allowed recognition of the first juvenile stage were drawn and described. All the subsequent stages obtained were examined and measured, and the main changes in relation to the first stage were recorded. Sexual dimorphism becomes apparent from the fourth juvenile stage onwards. Some appendages and morphological features proved to be of great importance in the identification of species, including the number of segments of the antennal flagellum and the number of setae on the maxilla and on the 1st, 2nd and 3rd maxillipeds. These can probably be used for future comparisons and species identifications.

  5. Caridean shrimps (Crustacea, Decapoda) from seagrass habitats in Hansa Bay, Papua New Guinea

    NARCIS (Netherlands)

    Grave, de Sammy

    1999-01-01

    Five species of caridean shrimps collected from seagrass habitats at Hansa Bay, on the northern coastline of Papua New Guinea are reported. Four species are new to the fauna of Papua New Guinea. Morphological details of Nikoides danae, Latreutes pymoeus and L. porcinus are discussed and compared to

  6. Crecimiento del cangrejo Callinectes danae (Decapoda: Portunidae de la Isla de Margarita, Venezuela

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    Jesylén Castillo

    2011-12-01

    Full Text Available Las especies del género Callinectes sostienen pesquerías importantes en varias partes del mundo. En el occidente de Venezuela, Callinectes sapidus es capturado con palangre y sostiene una pesquería artesanal importante en el Lago de Maracaibo; mientras que en la Isla de Margarita, Callinectes danae es capturado con nasa en zonas cercanas a lagunas costeras y su pesca está limitada por la oferta y la demanda. Estos recursos son de considerable importancia económica entre los crustáceos comestibles; sin embargo, pocos estudios han sido reportados sobre la dinámica poblacional y potencialidad pesquera en ambientes costeros de Venezuela que contribuyan a la toma de decisiones en la administración pesquera. En este documento se presenta información de los parámetros de crecimiento del cangrejo Callinectes danae Smith, 1869, con el fin de obtener un conocimiento detallado del patrón de crecimiento y lograr estimaciones más precisas sobre el tamaño de la población y su disponibilidad para la explotación. Se analizó una muestra constituida por 3 623 ejemplares capturados con nasa cangrejera por la flota artesanal, entre octubre 2007 y septiembre 2008. Se estableció la relación longitud-peso y se estimaron los parámetros de crecimiento de las curvas en longitud y peso del modelo de von Bertalanffy. La proporción sexual global mostró que no existe diferencia significativa entre machos y hembras (χ2=0.04, p>0.05. Los valores de las pendientes b entre machos y hembras presentaron diferencias significativas (ts=2.75, p<0.05 igualmente los interceptos a (ts=2.44, p<0.05; por lo que se estableció la relación longitud-peso por separado: P=7.48e-5*L2.98 para machos y P=1.21e-4*L2.87 para hembras, evidenciándose un crecimiento alométrico negativo en ambos sexos. Los parámetros de crecimiento quedaron establecidos en: L∞=134.80mm, P∞=166.04g y k=0.86/año para machos; L∞=122.35mm, P∞=118.45g y k=0.63/año para hembras. La longevidad fue de 3.05 años para machos y 4.24 años para hembras. Se concluye que Callinectes danae es una especie de vida corta con crecimiento moderadamente rápido, y los valores del coeficiente de variación (CV del índice de crecimiento phi prima (Ø’ demostraron diferencia de los patrones de crecimiento obtenidos en otras regiones. Como medida de manejo se recomienda considerar la talla mínima de captura por zona de pesca y revisar periódicamente las normativas, debido a la gran variabilidad en el crecimiento.

  7. First record of Palaemon macrodactylus Rathbun, 1902 (Decapoda, Palaemonidae in the western Mediterranean

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    A.P. TORRES

    2013-01-01

    Full Text Available The Mediterranean Sea is one of the world’s hotspots for marine bio-invasions. Most invasions are first documented based on an initial record of occasional adult captures. However, reports of larval stages could indicate that there is an adult population that is reproducing and therefore well established in the area. The spread of the oriental shrimp, Palaemon macrodactylus, from its native estuarine waters of southeast Asia to new regions worldwide is well documented. We report the first record of this species in the Mediterranean based on the presence of its larval stages in plankton samples. Decapod larvae were collected in five offshore plankton surveys performed off the Balearic Islands (western Mediterranean, and zoeae III and VI of the oriental shrimp werefound among them. Taking into account the duration of the successive developmental stages, and the hydrodynamic characteristics of the study area, these larvae were most probably spawned by adult populations not yet documented. The larvae were found in marine waters despite the fact that adults usually inhabit brackish waters. Our study is a good example of how plankton studies can help to detect larval stages of invasive species before the adult populations are detected.

  8. How marine upwelling influences the distribution of Artemesia longinaris (Decapoda: Penaeoidea?

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    Gustavo S Sancinetti

    2014-05-01

    Full Text Available Upwelling events can occur in most of the oceans altering the water physical, chemical and sediment conditions and consequently the species communities dwelling the areas. For better understanding the behavior of populations inhabiting upwelling regions, the spatial and temporal distribution of a Penaeoidea shrimp was studied correlating it with the abiotic factors that vary during upwelling and non-upwelling periods in an area under influence of Cabo Frio upwelling. Bottom salinity and temperature, organic matter and sediment type from each station were sampled from March 2008 to February 2010, in six stations located between 5 and 45 m depth. The lowest temperatures were recorded during spring and summer for both years with temperature values lower than 19ºC. A total of 26,466 Artemesia longinaris shrimps were captured mainly in 10-35 m depth. Upwelling periods showed significant differences in abundance in relation to non-upwelling periods. The spatial distribution among stations varied according to the temperature with higher abundance in stations with values between 19 and 21ºC. The highest abundance of A. longinaris was recorded in spring and summer when intrusions of the cold waters of South Atlantic Central Waters (SACW were frequent. Thus, the effect of cold water of SACW boosted by the upwelling was a determinant factor in the spatial and temporal distribution of A. longinaris in the studied region.

  9. Effects of late-cenozoic glaciation on habitat availability in Antarctic benthic shrimps (Crustacea: Decapoda: Caridea.

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    Johannes Dambach

    Full Text Available Marine invertebrates inhabiting the high Antarctic continental shelves are challenged by disturbance of the seafloor by grounded ice, low but stable water temperatures and variable food availability in response to seasonal sea-ice cover. Though a high diversity of life has successfully adapted to such conditions, it is generally agreed that during the Last Glacial Maximum (LGM the large-scale cover of the Southern Ocean by multi-annual sea ice and the advance of the continental ice sheets across the shelf faced life with conditions, exceeding those seen today by an order of magnitude. Conditions prevailing at the LGM may have therefore acted as a bottleneck event to both the ecology as well as genetic diversity of today's fauna. Here, we use for the first time specific Species Distribution Models (SDMs for marine arthropods of the Southern Ocean to assess effects of habitat contraction during the LGM on the three most common benthic caridean shrimp species that exhibit a strong depth zonation on the Antarctic continental shelf. While the shallow-water species Chorismus antarcticus and Notocrangon antarcticus were limited to a drastically reduced habitat during the LGM, the deep-water shrimp Nematocarcinus lanceopes found refuge in the Southern Ocean deep sea. The modeling results are in accordance with genetic diversity patterns available for C. antarcticus and N. lanceopes and support the hypothesis that habitat contraction at the LGM resulted in a loss of genetic diversity in shallow water benthos.

  10. Zoeal morphology of Pachygrapsus transversus (Gibbes (Decapoda, Grapsidae reared in the laboratory

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    Ana Luiza Brossi-Garcia

    1997-12-01

    Full Text Available Ovigerous females of Pachygrapsus transversus (Gibbes, 1850 were collected on the Praia Dura and Saco da Ribeira beaches, Ubatuba, São Paulo, Brazil. Larvae were individually reared in a climatic room at 25ºC temperature, salinities of 28, 32 and 35‰ and under natural photoperiod conditions. The best rearing results were observed at 35%o salinity. Seven zoeal instars were observed, drawing and described in detail. The data are compared with those obtained for P. gracilis (Saussure, 1858.

  11. Comportamiento reproductivo y fertilidad de Macrobrachium carcinus (Decapoda: Palaemonidae) en Venezuela

    OpenAIRE

    2016-01-01

    El camarón "gigante" de agua dulce Macrobrachium carcinus se encuentra presente en Venezuela tanto en puequeflos ríos litorales como en ríos más caudalosos. En el presente trabajo, seis machos y 22 hembras capturados en el río Manzanares del Edo. Sucre, fueron mantenidos durante 14 meses en el laboratorio con el objeto de hacer observaciones sobre el proceso de muda, apareamiento, desove, período de incubación, eclosión de los huevos y número de zonas/hembra. De los 33 procesos de muda observ...

  12. First record of Dilocarcinus pagei Stimpson, 1861 (Decapoda, Trichodactylidae in the state of Minas Gerais, Brazil

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    Valter Monteiro de Azevedo-Santos

    2010-06-01

    Full Text Available Among the species that represent the Trichodactylidae family is Dilocarcinus pagei Stimpson, 1861. This species shows a wide geographic distribution in the central region of South America. In Brazil, D. pagei had already been registered in Amapá, Amazonas, Pará, Mato Grosso, Rondônia, Acre, Mato Grosso do Sul and São Paulo. The present study aimed to register the occurrence of the species in Minas Gerais.

  13. Sensitivity of the freshwater prawn, Macrobrachium lanchesteri (Crustacea: Decapoda), to heavy metals.

    Science.gov (United States)

    Shuhaimi-Othman, Mohammad; Yakub, Nadzifah; Ramle, Nur-Amalina; Abas, Ahmad

    2011-07-01

    Adult Macrobrachium lanchesteri were exposed for a 4-day period in laboratory conditions to a range of copper (Cu), cadmium (Cd), zinc (Zn) and lead (Pb) concentrations. Mortality was assessed and median lethal times (LT₅₀) and concentrations (LC₅₀) were calculated. At the end of the 4-day period, live prawns were used to determine bioconcentration of the metals. LT₅₀ and LC₅₀ increased with the decrease in mean exposure concentrations and times, respectively, for all metals. LC₅₀s for 96 hours for Cu, Cd, Zn and Pb were 32.3, 7.0, 525.1 and 35.0 µg/L, respectively. Cu, Cd, Zn and Pb bioconcentration in M. lanchesteri increases with exposure to increasing concentrations and Cd was the most toxic to M. lanchesteri, followed by Pb, Cu and Zn. Comparison of LC₅₀ values for metals for this species with those for other freshwater crustacean organisms reveals that M. lanchesteri is equally or more sensitive to heavy metals than most other tested crustaceans.

  14. Evaluation of the response of Clibanarius africanus (Decapoda: Paguridae to crude oil in static bioassay

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    B.J. Oribhabor

    2012-12-01

    Full Text Available The acute toxicity of Nigeria Bonny light crude oil against hermit crab, Cliabanarius africanus of a tidal creek, Eastern Obolo, Akwa Ibom State, Nigeria was investigated in the laboratory under static bioassay. The test crude oil was found to be poorly toxic to the test organism, resulting in delayed mortality and consequent extension of the bioassay to 8 days. Based on the LC50, the toxicity of the test compound was more manifested on the 8 day than at 96 hour, with a toxicity factor showing that the test compound was approximately 12 times, more manifested against C. africanus on the 8 day than at 96 hour. Paired t-test showed that there was no significant difference between 96h LC50 (549.9 ml l-1 and 8d LC50 (45.2 ml l-1. The results of this study indicated that C. africanus is not a good early warning indicator for oil pollution but its response during spills could serve as a good indicator of adverse impact.

  15. Alpheus rudolphi spec. nov., a new snapping shrimp from northeastern Brazil (Crustacea: Decapoda: Alpheidae)

    NARCIS (Netherlands)

    Almeida, A.O.; Anker, A.

    2011-01-01

    A new snapping shrimp of the Alpheus armatus Rathbun, 1901 species complex, Alpheus rudolphi spec. nov., is described based on a single female holotype collected off Alagoas, northeastern Brazil (09°55.11’S 35°32.73’W). The new species differs from all other species of the A. armatus complex by the

  16. Taxonomic revision of doubtful Brazilian freshwater shrimp species of genus Macrobrachium (Decapoda, Palaemonidae

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    Leonardo G. Pileggi

    2012-12-01

    Full Text Available The freshwater prawns of the genus Macrobrachium Spence Bate, 1868 are widely distributed in rivers of tropical and subtropical regions and represent an interesting group with controversial taxonomy. The morphological characters traditionally used to separate species have shown a high intraspecific variation. Doubts about the status of M. birai Lobão, Melo & Fernandes, 1986, M. holthuisi Genofre & Lobão, 1978 and M. petronioi Melo, Lobão & Fernandes, 1986 have been arisen due to the high resemblance of the former two species with M. olfersi (Wiegmann, 1836, and the latter one with M. potiuna (Müller, 1880. Therefore, we performed a detailed morphological analysis of these species, including new characters not usually used in the species recognition. The present results here with molecular data lead us to conclude that M. birai and M. holthuisi are junior synonyms of M. olfersi, and M. petronioi is a junior synonym of M. potiuna. Considering these synonymies, 17 valid species are now reported for the Brazilian territory.

  17. Survival of Ucides cordatus (Decapoda: Ocypodidae megalopae during transport under different conditions of density and duration

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    Robson Ventura

    2010-01-01

    Full Text Available Target areas for Ucides cordatus (Linnaeus, 1763 restocking programs are often located far from the laboratory where larval rearing is developed. During translocation, the larvae are submitted to highly stressful conditions due to handling, packing, and transport activities. The aim of the present study was to assess the mortality rates of U. cordatus megalopae caused by different transportation procedures. Megalopae at loading densities of 50, 150, and 300 ind.L-1 were packed in double polyethylene 12 x 25 cm plastic bags with 200 ml of marine water at salinity 30. The bags were filled with oxygen at a proportion of 1:2 parts of water and sealed tightly. The trepidations during transport were simulated by the use of a shaker device (800 vibrations/minute over periods of three and six hours inside a dark container. The survivorship rates of larvae after simulation were compared to those obtained in control groups, which consisted of plastic vials with megalopae at a loading density of 50 ind.L-1 maintained at rest. Immediately after the two transport simulations, there was no significant difference in survivorship between the treatments and the control. However, 24 hours after simulation some of the tested densities resulted in significantly lower survivorships. The results demonstrated that U. cordatus megalopae can tolerate six hours of shaking during transportation, at high densities with minimal mortality.

  18. The control of vascular resistance in the southern rock lobster, Jasus edwardsii (Decapoda: Palinuridae).

    Science.gov (United States)

    Wilkens, J L; Taylor, H H

    2003-07-01

    In Jasus edwardsii (Hutton) the vascular resistance of each of the seven major arterial systems leaving the heart was increased in response to several of the following neurotransmitters and neurohormones: acetylcholine, adrenalin, serotonin, dopamine, octopamine and peptides proctolin and FLRFamide-related peptide F(1). The resistance to flow through the infrabranchial sinus (IBS), part of the venous system, was also sensitive to these drugs. Unexpectedly, the responses of the IBS continued after removal of the gills. Differences in the profiles of responses of the arteries to individual hormones and in the magnitudes and the time courses of back pressure changes, eliminate a common downstream location such as the venous sinuses or gills, as the source of the arterial responses. Vasoactive drugs were effective when applied either via the lumen or, with longer delay, to the basal side of an artery via the IBS. It is concluded that the resistance of each of these sections of the vascular system is independently controllable by hormones.

  19. Salmoneus yoyo nov. sp., a peculiar new infaunal shrimp from Lombok, Indonesia (Decapoda, Caridea, Alpheidae).

    Science.gov (United States)

    Anker, Arthur; Firdaus, Muhammad; Pratama, Idham Sumarto

    2014-08-18

    An unusual new species of the alpheid shrimp genus Salmoneus Holthuis, 1955 is described from Sekotong Bay, southwestern Lombok, Indonesia. The holotype and single known specimen of Salmoneus yoyo sp. nov. was collected with a suction pump from a burrow of unknown host, on a seagrass flat partly exposed at low tide. The new species presents three characters on the chelipeds that are unique within Salmoneus: a conspicuous, mesially curved, hook-like process on the distomesial margin of the merus, a row of blunt teeth on the ventromesial margin of the merus, and a series of blunt teeth on the ventromesial margin of the propodus. Salmoneus yoyo sp. nov. also has a characteristic colour pattern consisting of bright red chromatophores occupying most of the carapace surface, except for the frontal and post-frontal areas. 

  20. Caridean shrimps (Crustacea, Decapoda) from seagrass habitats in Hansa Bay, Papua New Guinea

    NARCIS (Netherlands)

    Grave, de Sammy

    1999-01-01

    Five species of caridean shrimps collected from seagrass habitats at Hansa Bay, on the northern coastline of Papua New Guinea are reported. Four species are new to the fauna of Papua New Guinea. Morphological details of Nikoides danae, Latreutes pymoeus and L. porcinus are discussed and compared to

  1. Leucosiid crabs from Papua New Guinea, with descriptions of eight new species (Crustacea: Decapoda: Brachyura).

    Science.gov (United States)

    Galil, Bella S; Ng, Peter K L

    2015-10-06

    Twenty-five species of leucosiid crabs are reported from Madang Province, Papua New Guinea. Of these, seven are new to science: two each are included in Alox Tan & Ng, 1995 and Tanaoa Galil, 2003, and one each in Ryphila Galil, 2009, Seulocia Galil, 2005, and Urnalana Galil, 2005. Fifteen additional species are new records for Papua New Guinea: Alox rugosum (Stimpson, 1858), Ancylodactyla nana (Zarenkov, 1990), Arcania heptacantha De Man, 1907, Heterolithadia fallax (Henderson, 1893), Hiplyra longimana (A. Milne Edwards, 1874), Myra curtimana Galil, 2001, M. digitata Galil 2004, Nursilia dentata Bell, 1855, Oreotlos etor Tan & Richer de Forges, 1993, Parilia major Sakai, 1961, Raylilia coniculifera Galil, 2001, R. uenoi (Takeda, 1995), Toru pilus (Tan, 1996), Urashima pustuloides (Sakai, 1961) and Leucosia rubripalma Galil, 2003. The new species are described and illustrated, and their affinities with allied taxa discussed. Colour photographs are provided for 20 species.

  2. Description of a new species of Petrolisthes in the Indo-West Pacific with a redefinition of P.hastatus Stimpson, 1858 and resurrection of P.inermis (Heller, 1862) (Crustacea, Anomura, Porcellanidae).

    Science.gov (United States)

    Werding, Bernd; Hiller, Alexandra

    2015-01-01

    The porcellanid crab Petrolistheshastatus Stimpson, 1858, has been traditionally viewed as a highly variable species with a wide distribution in the West Pacific. For more than a century there has been taxonomic confusion of this species with morphologically similar taxa, some of which were synonymized with Stimpson's taxon. We redefine Petrolistheshastatus, resurrect Petrolisthesinermis as a valid species, discuss the status of Petrolisthestenkatei De Man, 1893, and describe a new species as Petrolistheselegantissimus from Indonesia.

  3. Description of a new species of Petrolisthes in the Indo-West Pacific with a redefinition of P. hastatus Stimpson, 1858 and resurrection of P. inermis (Heller, 1862 (Crustacea, Anomura, Porcellanidae

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    Bernd Werding

    2015-08-01

    Full Text Available The porcellanid crab Petrolisthes hastatus Stimpson, 1858, has been traditionally viewed as a highly variable species with a wide distribution in the West Pacific. For more than a century there has been taxonomic confusion of this species with morphologically similar taxa, some of which were synonymized with Stimpson’s taxon. We redefine P. hastatus, resurrect P. inermis as a valid species, discuss the status of P. tenkatei De Man, 1893, and describe a new species as P. elegantissimus from Indonesia.

  4. Habitat heterogeneity in the assemblages and shell use by the most abundant hermit crabs (Anomura: Diogenidae and Paguridae: does the occupied shell species differ according to gender and species?

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    Gilson Stanski

    Full Text Available Abstract The goal of this study was to identify patterns of shell occupation by different species of hermit crabs from the southern Brazilian coast. In total, 644 individuals were collected, represented by six hermit species. Isocheles sawayai Forest & Saint Laurent, 1968 showed the highest abundance, with 575 individuals, followed by Loxopagurus loxochelis (Moreira, 1901 (n = 56. The other species were Petrochirus diogenes (Linnaeus, 1758, Dardanus insignis (Saussure, 1858, Pagurus exilis (Benedict, 1892 and Pagurus leptonyx Forest & Saint Laurent, 1968. Loxopagurus loxochelis was found associated with shells of 12 gastropod species, with 75% of males occupying shells of Olivancilaria urceus (Roding, 1798 and 78% of females inhabiting shells of Semicassis granulata (Born, 1778. Shells of Semicassis granulata were the lightest of all gastropod shells, demonstrating differential resource utilization. Additionally, I. sawayai occupied shells of 10 species, highlighting Stramonita haemastoma (Linnaeus, 1767 with the highest occupation percentage in all demographic classes, confirming a pattern of occupation with a strong relationship to the availability of the resource. The comparison of our results with those of other studies corroborated the influence of region and gastropod diversity on gastropod shell occupation.

  5. Studies on the reproductive dynamics of Pleoticus muelleri (Bate, 1888 (Crustacea, Decapoda, Solenoceridae of Patagonia, Argentina Estudios sobre la dinámica reproductiva del langostino Pleoticus muelleri (Bate, 1888 (Crustacea, Decapoda, Solenoceridae de Patagonia, Argentina

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    Mónica Fernández

    2012-11-01

    Full Text Available Certain aspects of the reproductive dynamics of Argentine red shrimp Pleoticus muelleri (Bate, 1888, distributed between 42°-47°S and 62°W, were investigated. Data and samples were collected during 36 INIDEP research cruises and 87 commercial fishing fleet trips between 1994-2010. Mature and inseminated females size structure as well as the frequency distribution of macroscopic maturity stages of adult females were analyzed on space-time bases. The seasonal development of ovarian maturity stages microscopically determinated was also assessed. Statistical treatment of data included multivariate scaling and cluster analysis. The reproductive activity of the shrimps showed latitudinal differences concerning its onset and duration that could be associated with the variability of environmental conditions. We discuss a shoreward movement of spawning females related to the presence of coastal hydrographic processes that would ensure retention and food for survival of early life stages.Se estudian ciertos aspectos de la dinámica reproductiva del langostino Pleoticus muelleri (Bate, 1988 en el área comprendida entre 42°-47°S y 62°W. Los datos y las muestras analizadas provienen de 36 campanas de investigación del INIDEP y de 87 viajes de la flota comercial langostinera realizados entre 1994 y 2010. Se analiza la estructura de tallas de las hembras maduras e impregnadas, al igual que la distribución de frecuencias de los distintos estadios de madurez sexual de las hembras adultas diferenciados macros-cópicamente, desde un enfoque espacio-temporal. La evolución estacional de los estadios de desarrollo ovárico determinados histológicamente también fue contemplada. El tratamiento estadístico de los datos comprendió un escalamiento multivariado y un análisis de agrupamiento jerárquico. La actividad reproductiva del langostino presenta diferenciaciones latitudinales con respecto a su inicio y duración que podría relacionarse con la variabilidad de las condiciones ambientales. Se discute la relación entre el movimiento hacia la costa de las hembras impregnadas y la presencia de procesos hidrográficos costeros que asegurarían la retención y disponibilidad de alimento para la supervivencia de las primeras etapas de vida.

  6. Aspectos reprodutivos de Palaemon pandaliformis (Stimpson) (Crustacea, Decapoda, Palaemonidae) no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil The reproductive aspects of the freshwater shrimp Palaemon pandaliformis (Stimpson) (Crustacea, Decapoda, Palaemonidae) from Sahy River, Mangaratiba, Rio de Janeiro, Brazil

    OpenAIRE

    Giovana Valverde Lima; Lídia Miyako Yoshii Oshiro

    2002-01-01

    The reproductive aspects of the freshwater shrimp Palaemon pandaliformis (Stimpson, 1871) were studied from March, 1998 to February, 1999. Monthly, samples were collected with sives, on the river edge, under the edging vegetation or in small pools. At the laboratory, shrimps were sexed and measured in their total lenght, from the tip of the rostrum to the of telson with precision callipters. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was me...

  7. Aspectos reprodutivos de Potimirim glabra (Kingsley (Crustacea, Decapoda, Atyidae no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil The reproductive aspects of the freshwater shrimp Potimirim glabra (Kingsley (Crustacea, Decapoda, Atyidae from Sahy River, Mangaratiba, Rio de Janeiro, Brazil

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    Giovana Valverde Lima

    2002-09-01

    Full Text Available The reproductive aspects of the freshwater shrimp Potimirim glabra (Kingsley, 1878 were studied from September 1997 to February 1999. Monthly, samples were collected with sieves, on the river edge, under the edging vegetation or in small pools. At the laboratory, shrimps were sexed and measured in their total lenght, from the tip of the rostrum to the end of telson with precision callipers. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was measured with calibrated stereomicroscope. A total of 3281 shrimps were collected, among which, 47% male, 46% female (13.4% ovigerous females and 7% young shrimps. The Sex ratio was 1:1. Ovigerous females were present during all seasons, but the reproductive peak occurred in spring. The ovigerous female showed total lenght from 9.5 to 26.0 mm and carapace lenght from 1.6 to 7.3 mm. The mean fecundity was 545 eggs per female, with a minimun of 223 eggs and a maximum of 860 eggs. The first sexual maturation probably occur at 9.5 mm total lenght. The mean diameter of the eggs size was 0.32 mm (minor and 0.53 mm (major.

  8. Aspectos reprodutivos de Palaemon pandaliformis (Stimpson (Crustacea, Decapoda, Palaemonidae no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil The reproductive aspects of the freshwater shrimp Palaemon pandaliformis (Stimpson (Crustacea, Decapoda, Palaemonidae from Sahy River, Mangaratiba, Rio de Janeiro, Brazil

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    Giovana Valverde Lima

    2002-09-01

    Full Text Available The reproductive aspects of the freshwater shrimp Palaemon pandaliformis (Stimpson, 1871 were studied from March, 1998 to February, 1999. Monthly, samples were collected with sives, on the river edge, under the edging vegetation or in small pools. At the laboratory, shrimps were sexed and measured in their total lenght, from the tip of the rostrum to the of telson with precision callipters. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was measured with calibrated stereomicroscope. A total of 872 were collected among which, 46% female, 29% male and 25% juvenil. The sex ratio was 1:1.57. Ovigerous females were present during all seasons, but the reproductive peak accurred in Spring. The ovigerous female showed total lenght from 23.0 to 39.6 mm. The mean fecundity was 137 eggs per female, with a minimum of 40 eggs and a maximum of 270 eggs. The first sexual maturation probably occur at 23.0 mm total lenght. The mean diameter os the eggs size was 0.51 mm (minor and 0.73 mm (major.

  9. Aspectos reprodutivos de Potimirim glabra (Kingsley) (Crustacea, Decapoda, Atyidae) no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil The reproductive aspects of the freshwater shrimp Potimirim glabra (Kingsley) (Crustacea, Decapoda, Atyidae) from Sahy River, Mangaratiba, Rio de Janeiro, Brazil

    OpenAIRE

    Giovana Valverde Lima; Lídia Miyako Yoshii Oshiro

    2002-01-01

    The reproductive aspects of the freshwater shrimp Potimirim glabra (Kingsley, 1878) were studied from September 1997 to February 1999. Monthly, samples were collected with sieves, on the river edge, under the edging vegetation or in small pools. At the laboratory, shrimps were sexed and measured in their total lenght, from the tip of the rostrum to the end of telson with precision callipers. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was me...

  10. Occurrence of the family Pinnotheridae De Haan (Crustacea, Decapoda, Brachyura on the coast of Ceará State, Brazil Ocorrência da família Pinnotheridae De Haan (Crustacea, Decapoda, Brachyura no litoral do Ceará, Brasil

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    Luis Ernesto A. Bezerra

    2006-12-01

    Full Text Available This study reports the occurrence of Austinixa bragantina Coelho, 2005; A. leptodactyla (Coelho, 1997 and Zaops ostreum (Say, 1817 for the State of Ceará, Northeast Brazil. These records represent the first account of the family Pinnotheridae de Haan, 1883 for the coast of Ceará. A. bragantina was collected on May and June 1995 at Futuro Beach, municipality of Fortaleza (3°42'S, 38°27'W. This species was previously known only for the type locality, Canela Island, Bragança, Pará, Brazil. A. leptodactyla was collected on November 2004 at Baleia Beach, municipality of Itapipoca (3°08'S, 39°27'W and Z. ostreum was obtained from the oyster Crassostrea rhizophorae Guilding, 1828, collected on November 2005 at the Jaguaribe River estuary, municipality of Fortim (4°24'S, 37°46'W. Biogeographic considerations regarding the three species and an updated list of all known Brazilian pinnotherid species along with their_geographic distribution are also provided.Este trabalho reporta a ocorrência de Austinixa bragantina Coelho, 2005; A. leptodactyla (Coelho, 1997 e Zaops ostreum (Say, 1817 para o litoral do Estado do Ceará, sendo estes os primeiros registros de representantes da família Pinnotheridae De Haan, 1883 para a costa cearense. A. bragantina foi coletada em maio e junho de 1995, na praia do Futuro, município de Fortaleza (3°42'S, 38°27'W. Esta espécie era conhecida, até o momento, apenas de sua localidade tipo, Ilha Canela, município de Bragança, Pará. A. leptodactyla foi coletada em novembro de 2004, na praia da Baleia, município de Itapipoca (3°08'S, 39°27'W e Z. ostreum foi obtido a partir do exame de ostras da espécie Crassostrea rhizophorae Guilding, 1828, coletadas em novembro de 2005 no estuário do Rio Jaguaribe, município de Fortim (4°24'S, 37°46'W. São apresentadas considerações biogeográficas sobre as três espécies assim como uma lista atualizada de todos os pinoterídeos do litoral brasileiro e sua distribuição geográfica.

  11. Estrutura populacional de Armases angustipes (Dana (Decapoda, Brachyura, Grapsidae na Ilha do Farol, Matinhos, Paraná Population structurc of Armases angustipes (Dana (Decapoda, Brachyura, Grapsidae from Farol Island, Matinhos, Paraná

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    Vânia G.L. Kowalczuk

    2000-03-01

    Full Text Available Annual fluetuation of densities and population strueture of Armases angustipes (Dana, 1852 from a rocky shore at Farol Island, Matinhos, Paraná, Brazil (25º51'S and 48º32'W were studied. The population strueture was treated in the following aspects: sexual proportion, dial intensity of activities, size composition and its fluetuation, and general condition of the crabs. The collections were made monthly, from January to December 1991. The samples were obtained handly, in the morning and at night, at the supratidal zone during low tides. There were caught 1,139 crabs, among which 34 were juveniles, 544 males, 555 females and 4 ovigerous females. Population density was highest in April (19.56 ind.m"² and in October (23.86 ind.m"² . The sexual proportion was 1:1 in eleven months. Although the male crabs were more abundant than the females in May, there was not any statistical significam difference between the sexes. The activity of the population is intenser at night than at morning for both sexes. The recruitment of juveniles oceurs mainly in March, April and July. The condition factor in females is related to the reproduetive period. The population can migrate to the terrestrial habitat near the supratidal zone.

  12. Observações sobre a ocorrência de Pilumnus floridanus Stimpson (Decapoda, Brachyura, Pilumnidae na costa do Rio de Janeiro, Brasil Remarks about the Pilumnus floridanus Stimpson (Decapoda, Brachyura, Pilumnidae occurrence in Rio de Janeiro coast, Brazil

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    Lydia M. S. Oliveira

    2006-12-01

    Full Text Available Os espécimes foram coletados na Baía de Sepetiba, Rio de Janeiro no inverno. Sua distribuição era conhecida para Off Cape Lookout, Carolina do Norte até a Flórida, Golfo do México, Canal de Yucatan, Honduras, Antilhas, Venezuela e Brasil (Alagoas, Sergipe e Bahia.The specimens were collected in Sepetiba Bay during the winter. Their distribution was formerly known from Off Cape Lookout, North Carolina until Florida, Gulf of Mexico, Yucatan Channel, Honduras, Antilles, Venezuela and Brazil (Alagoas, Sergipe and Bahia.

  13. Estrutura populacional de Uca maracoani (Decapoda, Brachyura, Ocypodidae no Baixio Mirim, Baía de Guaratuba, Paraná Population structure of Uca maracoani (Decapoda, Brachyura, Ocypodidae from the tidal flat of Baixio Mirim, Guaratuba Bay, Parana State, Brazil

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    Mariângela Di Benedetto

    2009-12-01

    Full Text Available Um estudo sobre a flutuação anual da abundância, composição de tamanho dos indivíduos, proporção de sexos, período reprodutivo e de recrutamento dos juvenis de uma população de Uca maracoani (Latreille, 1802-1803 foi realizado no Baixio Mirim, Baía de Guaratuba, Paraná (48º36'W e 25º52'S. Os animais foram coletados mensalmente, de fevereiro/2005 a janeiro/2006, durante as marés baixas de sizígia, e a sua largura da carapaça (LC medida. A temperatura pontual do ar variou de 17 a 29ºC, a luminosidade de 8.740 a 151.300 lux, a salinidade de 8 a 25 e a temperatura do solo (superfície, 5 cm, 10 cm, 15 cm e 20 cm de profundidade de 18,3 a 28,9ºC. Foram analisados 7.120 indivíduos, dos quais, 2.578 juvenis sexualmente indefinidos, 2.377 machos e 2.165 fêmeas. A abundância da população variou de 341 (abril a 994 indivíduos (janeiro, mas a sua flutuação anual não esteve relacionada com a das variáveis abióticas estudadas. A proporção de sexos foi de 1:1 e a reprodução da espécie é do tipo contínuo, com dois picos de intensidade: um em abril e outro em novembro. O recrutamento de juvenis, também, é contínuo com dois períodos mais intensos no ano, um em julho e outro em dezembro-janeiro. A LC da população variou de 1,14 a 2,62 mm para juvenis sexualmente indefinidos, 2,58 a 17,83 mm para machos juvenis, 2,60 a 11,72 mm para fêmeas juvenis, 17,85 a 35,81 mm para machos maduros e 11,75 a 31,76 mm para fêmeas maduras. Os machos atingem tamanhos maiores do que as fêmeas.A study about the annual fluctuation of the abundance, size composition, sexual proportion, reproductive period and juvenile recruitment of the fiddler crab Uca maracoani (Latreille, 1802-1803 was carried out in a population living in a tidal flat at Guaratuba Bay, Parana State, Brazil (48º36'W e 25º52'S. Crabs were obtained from February 2005 to January 2006, during low spring tides, in monthly collections, and their carapace width was measured. Air temperature oscillated from 17 to 29ºC, luminosity from 8,740 to 151,300 lux, salinity from 8 to 25 and soil temperature (on surface, 5 cm, 10 cm, 15 cm and 20 cm depth from 18.3 to 28.9ºC. A total of 7,120 individuals were analyzed, among them, 2,578 were sexually indefinite juveniles, 2,377 males (1,113 juveniles and 1,264 mature males and 2,165 females (944 juveniles, 1,135 mature and 86 ovigerous females. Population abundance oscillated 341 (April to 994 individuals (January, but its annual fluctuation was not correlated to the oscillation of the abiotic variables. The sexual proportion was 1:1 and the reproduction of the species is continuous type, with two peaks of intensity in the year: one in April and another in November. Juvenile recruitment is also continuous with two periods of intensity in the year: in July and in December-January. Sexually indefinite juveniles measured from 1.14 to 2.62 mm carapace width, juvenile males from 2.58 to 17.83 mm, juvenile females from 2.60 to 11.72 mm, mature males from 17.85 to 35.81 mm and mature females from 11.75 to 31.76 mm. Males reach larger sizes than females.

  14. Mating systems in caridean shrimp (Decapoda: Caridea and their evolutionary consequences for sexual dimorphism and reproductive biology Sistemas de apareamiento en camarones carideos (Decapoda: Caridea y sus consecuencias evolutivas en el dimorfismo sexual y biología reproductiva

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    CRISTIÁN CORREA

    2003-06-01

    Full Text Available In this paper we review functional and evolutionary relationships among mating systems of caridean shrimp and specific traits such as general biology/ecology, sexual systems, behavior and morphology. Four mating systems are described based on reports from available literature, and a fifth system is recognized but published information is insufficient to describe it in detail. `Monogamy' occurs in many species inhabiting monopolizable refuges or hosts, especially when environmental conditions restrict the probability of intraspecific interactions. In contrast, free-living species experience higher encounter rates and males can dominate or search. In `neighborhoods of dominance' mating systems, large males have higher reproductive success since they perform better in fights for receptive females. In `pure searching' mating systems, small and agile males do better because they search more efficiently for mates within the population. The fourth mating system is `search & attend' occurring in solitary symbionts, which experience variable ecological and demographic environments: depending on environmental conditions and ontogenetic stages it may either be profitable for males to search or to attend hosts with sexually attractive females. Sexual systems of caridean shrimp are characterized by their high diversity and intraspecific plasticity, including gonochorism and different forms of protandric or simultaneous hermaphroditism. The identified mating systems partially explained this diversity: In monogamous species, low encounter rates and lack of sexual dimorphism favors simultaneous hermaphroditism but gonochory usually occurs among these species probably because mates are not strictly faithful. Species with neighborhoods of dominance mating are gonochoristic because both sexes benefit from being large. Pure searching species have a wide opportunity for the evolution of protandry since small males benefit while the opposite is true for females. In species with search & attend the situation is variable, and only some males benefit by acquiring large size while others do better by searching or changing sex. In contrast to other crustaceans free-living shrimp do not exhibit precopulatory mate guarding and they are relatively unaggressive. The characteristic and efficient escape behavior of shrimp using their contractile abdomen might be one important trait that has constrained the evolution of such behaviors. Our review indicates that the mating systems of caridean shrimp depend both on environmental and on biological characteristicsEn este articulo revisamos relaciones funcionales y evolutivas entre los sistemas de apareamiento de camarones carideos, y características específicas tales como biología/ecología general, sistemas sexuales, conducta y morfología. Basados en reportes bibliográficos se describió cuatro sistemas de apareamiento, y un quinto fue reconocido pero la informaci��n disponible fue insuficiente para describirlo en detalle. `Monogamia' ocurre en muchas especies que habitan en refugios monopolizables o huéspedes, especialmente cuando las condiciones ambientales restringen la probabilidad de encuentros entre conespecíficos. En contraste, las especies de vida libre experimentan encuentros más frecuentes y los machos pueden dominar o buscar: En el sistema de apareamiento `dominancia vecinal' los machos más grandes rinden mayor éxito reproductivo porque son los que tienen el mejor desempeño en la competencia agresiva por las hembras receptivas. En el sistema `pura búsqueda' son los machos pequeños los que lo hacen mejor porque su agilidad les permite buscar pareja eficazmente entre la población. El cuarto sistema de apareamiento es `búsqueda & compañía' que ocurre en simbiontes solitarios que experimentan condiciones demográficas y ecológicas variables: dependiendo de las condiciones ambientales y del estado ontogenético, puede ser conveniente para los machos buscar o permanecer en huéspedes con hembras sexualmente atractivas. Los sistemas sexuales de los carideos se caracterizan por su diversidad y plasticidad intraespecífica, habiendo especies gonocóricas, otras con diferentes formas de hermafroditismo protándrico e incluso hermafroditas simultáneas. Los sistemas de apareamiento identificados parcialmente explican esta diversidad: en especies monogamas las bajas tasas de encuentro y la falta de dimorfismo sexual, favorecen el hermafroditismo simultáneo pero la gonocoría normalmente domina posiblemente porque las parejas no son estrictamente fieles. Especies con dominancia vecinal son gonocóricas porque ambos sexos se benefician con ser grandes. Las especies con pura búsqueda tienen una amplia oportunidad para la evolución de protandría ya que los más beneficiados son los machos pequeños y las hembras grandes. En especies con búsqueda & compañía la situación es variable, solo algunos machos se benefician al ser suficientemente grandes, mientras que otros lo hacen mejor buscando o cambiando de sexo. En comparación con otros crustáceos, los camarones de vida libre se caracterizan por la ausencia de custodia precopulatoria e infrecuentes conductas agresivas. La eficiente y característica conducta de escape de los camarones usando su abdomen contractil podría ser un importante impedimento para la evolución de tales conductas. Nuestra revisión provee buenos indicios de que los sistemas de apareamiento de camarones carideos dependen tanto de características ambientales como biológicas propias de este taxón

  15. Catch composition of the spiny lobster Panulirus gracilis (Decapoda: Palinuridae off the western coast of Mexico Composición de la captura de la langosta espinosa Panulirus gracilis (Decapoda: Palinuridae en la costa oeste de México

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    Raúl Pérez-González

    2011-07-01

    Full Text Available The lobster fishery in the Gulf of California and the south-central region of the western coast of Mexico consists of small-scale artisanal activity supported by Panulirus gracilis and P. inflatus, with an annual average catch of 132 ton. The present study analyzes the landing composition of this fishery and the population structure of P. gracilis. Carapace lengths (CL for this species ranged from 35 to 125 mm, and the most frequent sizes were between 60 and 85 mm. The size distribution was approximately normal. This implies that the fishery is composed of several size classes, with annual recruitment to the fishing areas. For the 1989-1990 and 1990-1991 fishing seasons, the mean monthly sizes of males were between 70.18 ± 11.74 and 81.11 ± 6.76 mm CL, whereas females averaged from 73.60 ± 8.95 to 80.28 ± 7.53 mm CL. Power-law relationships between carapace length (CL in mm and total weight (TW in g were determined, resulting in the following equations: PT = 0.0021 CL27689 for males and PT = 0.0009 CL³ 0038 for females. During certain periods of the year, males dominated the catch; however, the overall annual male:female ratio was near 1:1.La pesquería de langosta en el golfo de California y en el centro-sur de la costa occidental de México es una actividad artesanal a pequeña escala y es sostenida por Panulirus gracilis y P. inflatus, con una captura promedio anual de 132 ton. En este estudio se analiza la composición de los desembarques de esta pesquería y la estructura de la población de P. gracilis. El intervalo de talla de esta especie fue de 35 a 125 mm de longitud del cefalotórax (LC y el más frecuente se encontró entre 60 y 85 mm. La distribución de tallas fue aproximadamente normal. Esto implica que la pesquería está compuesta por varias clases de tallas, con un reclutamiento anual a las áreas de pesca. La talla media mensual de machos fue entre 70,18 ± 11,74 y 81,11 ± 6,76 mm LC y en hembras de 73,60 ± 8,95 a 80,28 ± 7,53 mm LC, durante las temporadas de pesca 1989-1990 y 1990-1991. Se determinó la relación entre la LC (en mm y el peso total (PT, en g, obteniéndose las siguientes ecuaciones: PT = 0.0021 LC2.7689 en machos y PT = 0.0009LC3.0038 en hembras. Durante ciertos períodos del año los machos son dominantes en las capturas, pero la proporción machos:hembras durante todo el año es cercana a 1:1.

  16. Postlarval settlement of spiny lobster, Panulirus argus (Latreille, 1804 (Decapoda: Palinuridae, at the Caribbean coast of Costa Rica Asentamiento postlarval en la langosta espinosa, Panulirus argus (Latreille, 1804 (Decapoda: Palinuridae en la costa Caribe de Costa Rica

    Directory of Open Access Journals (Sweden)

    Oscar González

    2011-11-01

    Full Text Available Lobster fishery (Panulirus argus forms an important part of the fishing activities along the Caribbean coast of Central America. The present study provides information regarding the seasonal abundance and distribution of postlarval P. argus in Parque Nacional Cahuita, Costa Rica. During the study period (March 2004-February 2005, a total of 1907 pueruli were obtained from GuSi collectors. Postlarvae were present during all months, with a pronounced peak in January-February 2005 (CPUE of 21.82 and 22.18, pueruli/collector/month, respectively, and minor peaks in May and October 2004. The abundance of postlarval P. argus in the study area was comparable to locations which support important lobster fisheries, e.g. Mexico. A majority of the postlarvae (1027 ind. was collected during the first quarter moon, the remaining pueruli (880 ind. during new moon; these results are in general agreement with similar findings for P. argus in the Caribbean area. Based upon our results, we recommend introducing a local or regional monitoring program, studying spiny lobster migration and distribution patterns, and evaluate the introduction of artificial shelters for P. argus.Las capturas de langosta (Panulirus argus son de gran importancia en la actividad pesquera a lo largo de las costas del Caribe de Centroamérica. El presente estudio proporciona información relevante de la abundancia temporal y la distribución de postlarvas de P. argus en el Parque Nacional Cahuita, Costa Rica. Durante el periodo de estudio (Marzo 2004-Febrero 2005, un total de 1907 puérulos fueron obtenidos del colector GuSi. Las postlarvas fueron colectadas durante todos los meses, con máximos en enero-febrero 2005 (CPUE de 21.82 y 22.18, puérulos/colector/mes, respectivamente, y mínimos en mayo y octubre de 2004. La abundancia de postlarvas de P. argus en el estudio es comparada con áreas que soportan importantes pesquerías, p. ej. México. La mayoría de las postlarvas (1027 ind. fueron colectadas durante el cuarto creciente lunar, los restante puerulos (880 ind. se obtuvieron en luna nueva. Estos resultados, en general, son consistentes con los encontrados para P. argus en el mar Caribe. Basados en estos resultados, se recomienda la introducción de un programa de monitoreo a nivel local o regional, estudiar los patrones de migración y distribución de la langosta espinosa, y evaluar la introducción de refugios artificiales para P. argus.

  17. Reproductive biology of the spider crab Leucippa pentagona (Decapoda: Epialtidae, in Bustamante Bay, Argentina Biología reproductiva del cangrejo araña Leucippa pentagona (Decapoda: Epialtidae, en Bahía Bustamante, Argentina

    Directory of Open Access Journals (Sweden)

    Martín Varisco

    2011-11-01

    Full Text Available Sizes at maturity, breeding period, and fecundity of the spider crab Leucippa pentagona in Bustamante Bay, Argentina (45.11°S, 66.56°W were analyzed. Specimens were collected monthly between May 2006 and February 2008. The size at morphometric maturity was determined based on relative changes in cheliped length for males and abdomen width for females. The presence of spermatophores in the male deferent ducts and of eggs in the female abdomens were the criteria used to determine physiological maturity. The temporal variation of the proportion of ovigerous females was analyzed. Oocyte sizes in ovigerous females were measured to evaluate the occurrence of multiple spawnings. In males, the sizes at morphometric and physiological maturity were 28.05 and 16.7 mm carapace length (CL, respectively. In females, the size at morphological maturity was 18.5 mm CL, whereas size at physiological maturity was 18.25 CL. Ovigerous females were found between June and February in both years. Ovigerous females were found to have oocytes with advanced vitellogenesis. Fecundity was similar in both years and varied between 645 and 7114 eggs. The extended breeding period and the presence of vitellogenic oocytes in ovigerous females suggest the occurrence of two or more spawnings per reproductive season. Finally, the distribution range of this species in the Atlantic Ocean was extended from 43.3° to 45.11°S.Se analizó las tallas de madurez sexual, el periodo de ocurrencia de hembras ovígeras y la fecundidad del cangrejo araña Leucippapentagona en Bahía Bustamante, Argentina (45,11°S, 66,56°W. Los ejemplares fueron muestreados mensualmente entre mayo 2006 y febrero 2008. La determinación de la talla de madurez morfométrica se basó en cambios relativos en la longitud del quelípedo y el ancho del abdomen para machos y hembras, respectivamente. La presencia de espermatóforos en el conducto deferente de los machos y de huevos en las hembras fueron los criterios empleados para determinar la madurez fisiológica. Se analizó la variación temporal de la proporción de hembras ovígeras. El tamaño de los oocitos de hembras ovígeras fue medido para evaluar la ocurrencia de desoves múltiples. Las tallas de madurez morfométrica y fisiológica en los machos fueron 28,05 y 16,7 mm de longitud de caparazón (LC, respectivamente. En las hembras, la talla de madurez morfométrica fue 18,5 mm de LC y la de madurez fisiológica fue 18,25 mm de LC. Hembras ovígeras ocurren desde junio a febrero, en ambos años. En hembras ovígeras se encontraron oocitos en vitelogenesis avanzada. La fecundidad fue similar en ambos años y varió entre 645 y 7114 huevos. El prolongado periodo en que las hembras portan huevos y la presencia de hembras ovígeras con oocitos vitelogénicos sugieren la ocurrencia de dos o más desoves durante una temporada reproductiva. Finalmente, se amplía el rango de distribución de esta especie en el océano Atlántico desde 43,30° hasta 45,11°S.

  18. Parastacus pugnax (Poeppig, 1835) (Crustacea, Decapoda, Parastacidae): conocimiento biológico, presión extractiva y perspectivas de cultivo/Parastacus pugnax (Poeppig, 1835) (Crustacea, Decapoda, Parastacidae): biological knowledge, extraction pressure and culture perspectives

    National Research Council Canada - National Science Library

    Erich H Rudolph

    2013-01-01

    ...: systematic, geographical distribution, habitat, burrowing behavior, morphological variation, teratological cases, size, length-weight relationship, size structure, population density, reproductive...

  19. Descrição de Austinixa bragantina sp. nov. (Crustacea, Decapoda, Pinnotheridae do litoral do Pará, Brasil Description of Austinixa bragantina, sp. nov. (Crustacea, Decapoda, Pinnotheridae from the coast of Pará State, Brazil

    Directory of Open Access Journals (Sweden)

    Petrônio A. Coelho

    2005-09-01

    Full Text Available É apresentada a descrição de Austinixa bragantina sp. nov., encontrada no litoral paraense em associação com os calianassídeos Lepidophthalmus siriboia Felder & Rodrigues, 1993 and Callichirus major (Say, 1818Austinixa bragantina sp. nov., found in Pará coast associated with the Callianassid Lepidophthalmus siriboia Felder & Rodrigues, 1993 and Callichirus major (Say, 1818, is described.

  20. Aspectos da reprodução de Palaemon pandaliformis (Stimpson (Decapoda, Palaemonidae no manguezal de Ratones, Florianópolis, Santa Catarina Reproductive aspects of Palaemon pandaliformis (Stimpson (Decapoda, Palaemonidae at Ratones Mangrove, Florianópolis, Santa Catarina

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    Yara Maria Rauh Müller

    1996-01-01

    Full Text Available Biometric and reproductive aspects of Palaemon pandaliformis (Stimpson, 1871 from Ratones Mangrove, Florianópolis, Santa Catarina, have been investigated. Individuals were monthly collected from August, 91 to July, 93 and the temperature and salinity registered. Biometry, sex-ratio, sexual maturity, fecundity and reproductive cycle have been determined. The temperature showed defined temporal distribution. This species presents animal reproductive cycle, relatively high individual and populational fecundity, and the ovigerous females were larger than males and other females of the same species.

  1. Biologia reprodutiva de Macrobrachium olfersii (Wiegman (Crustacea, Decapoda, Palaemonidae coletados na Ilha de Santa Catarina, Brasil Reproductive biology of Macrobrachium olfersii (Wiegman (Crustacea, Decapoda, Palaemonidae collected at Santa Catarina's Island, Brazil

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    Dib Ammar

    2001-06-01

    Full Text Available The aim of this study is to characterize the reproductive features of Macrobrachium olfersii (Wiegman, 1836 from Santa Catarina's lsland. The animals were collected in freshwater streams of the Ratones Hidrografic Basin (site A1 and at the Peri's Pond (site A2. In the laboratory, the procedures of sexual differentiation were carried out to classify the individuais in males, females or ovigerous females, followed by the determination of total weight (g, quelipod relative weight (g and total length (mm. The eggs were removed from the ovigerous females and counted. Sexual maturity and fecundity were analyzed based in the dimensions and number of eggs carried by ovigerous females. The water temperature on the capture sites varied from 17 to 29ºC throughout the months of study. A total of 503 individuais were captured, with 129 individuais from site A1 and 374 from site A2. The mean total size and length was 49.65 mm and 3.79 g for the males, 38.75 mm and 1.61 g for the females and 36.19 mm and 1.08 g for the ovigerous females. At the sites A1 and A2, the individual sexual maturity was reached with 27.3 and 21.2 mm of total length, respectively, while populational sexual maturity was estimated for the 45.0 to 50.0 mm class at site A1 and for the 30.0 to 35.0 mm class at site A2. The ovigerous females carried an average of 3464 eggs at site A1, and 1440 eggs at site A2. These reproductive features, presented by M. olfersii, show the species' plasticity, which can be associated with environmental variations, contributing to its reproductive success.

  2. Sacculina nectocarcini, a new species of rhizocephalan, a new species of rhizocephalan(Cirripedia: Rhizocephala) parasitising the red rock crabNectocarcinus integrifrons (Decapoda: Brachyura: Portunidae)(Decapoda: Brachyura: Portunidae)

    DEFF Research Database (Denmark)

    Gurney, Robert H.; Rybakov, Alexey V.; Høeg, Jens Thorvald

    2006-01-01

    The parasitic barnacles, Rhizocephala, are a little known group within Australia with only seven described species from a coastline stretching approximately 59763 km. This study describes a new species of Rhizocephala, Sacculina nectocarcini. The description is based on a unique combination...

  3. Larval development of the rock shrimp Rhynchocinetes typus Milne Edwards, 1937 (Decapoda, Caridea reared in the laboratory Desarrollo larval del camarón de roca Rhynchocinetes typus Milne Edwards, 1937 (Decapoda, Caridea cultivados en laboratorio

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    ENRIQUE DUPRÉ

    2008-06-01

    Full Text Available The first description of the larval stages of a representative of the family Rhynchocinetidae from the southeastern Pacific coast of South América is presented. Larvae of the rock shrimp Rhynchocinetes typus, from rocky subtidal environment of the Chile-Pera coast were reared in the laboratory at 22 °C, salinity 32 and feeding with Anemia franciscana. Seven zoeal stages, which occur through 10 successive moults, are described and illustrated in detail. Morphological comparison made between R. typus and other congeneric and related species belonging to Rhynchocinetid showed the main characteristic for the diagnosis of zoeal stages are: (a the pereiopods appear in the third stage, (b the exopod of the antennae have six segments, and (c no pleopods were found on the seven stages. The main difference with related species was the presence of three lacinia in the right mandible at stage VIL.Se describe por primera vez el desarrollo larval de un representante de la familia Rhynchocinetidae en aguas del Pacífico suroriental. Las larvas de camarón de roca Rhynchocinetes typus Milne Edwards, 1937 que habita en el submareal rocoso de la costa de Chile-Perú, se cultivaron en laboratorio a 22 °C, con salinidad de 32 y se alimentaron con Anemia franciscana. Se determinaron siete estados de zoea que ocurren a través de 10 mudas sucesivas. Cada uno de los estados se describió e ilustró detalladamente. La comparación morfológica con otras especies congenéricas y otras especies de la familia Rhynchocinetidae indicó que las principales características distintivas de los estados de zoea fueron: (a el primer par de pereiópodos aparece en la zoea III, (b el exopodito de la antena presenta seis segmentos, y (c no se observaron pleópodos en ninguno de los siete estados descritos. La principal característica que diferencia la zoea de R. typus de las demás especies es la presencia de tres lacinias en la mandíbula derecha en el estado VIL.

  4. Biologia dos Palaemonidae (Crustacea, Decapoda) da bacia hidrográfica de Ratones, Florianópolis, Santa Catarina, Brasil Biology of Palaemonidae (Crustacea, Decapoda) from the Ratones hidrografic basin, Florianópolis, Santa Catarina, Brazil

    OpenAIRE

    Yara Maria Rauh Müller; Evelise Maria Nazari; Dib Ammar; Eduardo Cargnin Ferreira; Ingrid Thaís Beltrame; Cristiane Pacheco

    1999-01-01

    Biological aspects of palemonids, collected from March, 91 to December, 95 in the Ratones Hidrographic Basin, Florianópolis, Santa Catarina, have been investigated. Individuals of different sizes of Macrobrachium acanthurus (Weigmann, 1836), Macrobrachium carcinus (Linnaeus, 1758), Macrobrachium olfersii (Weigmann, 1836), Macrobrachium potiuna (Müller, 1880), Palaemonetes argentinus Nobili, 1901 and Palaemon pandaliformis (Stimpson, 1871) were registered. These prawns, showed reproductive str...

  5. Biologia dos Palaemonidae (Crustacea, Decapoda da bacia hidrográfica de Ratones, Florianópolis, Santa Catarina, Brasil Biology of Palaemonidae (Crustacea, Decapoda from the Ratones hidrografic basin, Florianópolis, Santa Catarina, Brazil

    Directory of Open Access Journals (Sweden)

    Yara Maria Rauh Müller

    1999-01-01

    Full Text Available Biological aspects of palemonids, collected from March, 91 to December, 95 in the Ratones Hidrographic Basin, Florianópolis, Santa Catarina, have been investigated. Individuals of different sizes of Macrobrachium acanthurus (Weigmann, 1836, Macrobrachium carcinus (Linnaeus, 1758, Macrobrachium olfersii (Weigmann, 1836, Macrobrachium potiuna (Müller, 1880, Palaemonetes argentinus Nobili, 1901 and Palaemon pandaliformis (Stimpson, 1871 were registered. These prawns, showed reproductive strategies, typical of the Palaemonidae (Rafinesque, 1815, associated to species particularities, and seem to adapt to different environmental conditions.

  6. Lychnorhiza lucerna Haeckel (Scyphozoa, Rhizostomeae and Libinia ferreirae Brito Capello (Decapoda, Majidae association in southern Brazil Associação entre Lychnorhiza lucerna Haeckel (Scyphozoa, Rhizostomeae e Libinia ferreirae Brito Capello (Decapoda, Majidae no sul do Brasil

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    Miodeli Nogueira Júnior

    2005-12-01

    Full Text Available Associations between jellyfish and other organisms are frequently reported. Neverhteless, few of those records include crabs inhabiting medusae. Lychnorhiza lucerna Haeckel, 1888 were sampled (n = 1988 on the coast of the State of Paraná (25º20'-25º55'S, 48º10'-48º35'W, southern Brazil, from December 1997 to December 2004. Eight percent (166 individuals of the medusae had one spider crab Libinia ferreirae Brito Capello, 1871 living within its subgenital porticus or on the oral arms. Megalopal stages of the same crab were also found on three jellyfish. All crabs associated with L. lucerna were young and smaller (Associações entre medusas e diversos outros organismos são freqüentemente relatadas. Entretanto sobre caranguejos que vivem em águas-vivas apenas alguns registros foram encontrados. Entre dezembro de 1997 e dezembro de 2004, foram coletados 1988 exemplares de Lychnorhiza lucerna Haeckel, 1888 na costa do Estado do Paraná (25º20'-25º55'S, 48º10'-48º35'W, Sul do Brasil. Oito por cento (166 indivíduos das medusas abrigavam um caranguejo aranha Libinia ferreirae Brito Capello, 1871 no interior de seu pórtico subgenital ou sobre seus braços orais. Megalopas da mesma espécie também foram encontradas em três exemplares de L. lucerna. Todos os caranguejos encontrados associados eram jovens e menores (< 3 cm do que os espécimes solitários capturados no fundo. Os resultados indicam que L. ferreirae coloniza a água-viva em sua fase pós-larval e a usa como um criadouro flutuante, antes de se estabelecer no fundo como um caranguejo adulto típico.

  7. Fecundidade em Callinectes danae Smith (Decapoda, Portunidae da lagoa da Conceição, Florianópolis, Santa Catarina, Brasil Fecundity of Callinectes danae Smith (Decapoda, Portunidae in lagoa da Conceição, Santa Catarina, Brazil

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    Joaquim Olinto Branco

    1992-01-01

    Full Text Available The estimate for the average fecundity for the C. danae population of Lagoa da Conceição (Florianópolis, Santa Catarina was of 598.885 eggs by female. The average number of eggs and the weight of the mass of eggs, in general, increase with the female size. The variation in colour and in the diameter of the eggs is associated with the degree of development of the embryo.

  8. Parastacus pugnax (Poeppig, 1835) (Crustacea, Decapoda, Parastacidae): conocimiento biológico, presión extractiva y perspectivas de cultivo/Parastacus pugnax (Poeppig, 1835) (Crustacea, Decapoda, Parastacidae): biological knowledge, extraction pressure and culture perspectives

    National Research Council Canada - National Science Library

    Erich H Rudolph

    2013-01-01

      The burrowing crayfish, Parastacus pugnax (Poeppig, 1835), is one of six species of the family Parastacidae inhabiting the fresh waters of Chile, which supports the greatest extraction effort for human consumption...

  9. Crescimento relativo do camarão canela Macrobrachium amazonicum (Heller (Crustacea, Decapoda, Palaemonidae em viveiros Relative growth of Amazon river prawn Macrobrachium amazonicum (Heller (Crustacea, Decapoda, Palaemonidae in earthen ponds

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    Patrícia M.C. Moraes-Riodades

    2002-12-01

    Full Text Available Some morphometric relationships in Macrobrachium amazonicum (Heller, 1862 reared in earthen ponds were studied. A total of 239 individuals were collected, sexed and sorted to juvenile or adult. Total length (Lt, post-orbital length (Lpo, carapace length (Lcp and queliped length (Lql were measured. The relationships Lt/Lpo, Lpo/Lcp and Lt/Lcp are the same for juveniles, males and females, indicating unchanged growth pattern during post-larval ontogenetic development. While Lt/Lpo showed isometric growth, Lpo/Lcp and Lt/Lcp showed negative allometry. On the other hand, for the Lql/Lcp relationship, juveniles showed isometric growth, females slight positive allometry and males a strong positive allometry. It suggests that the importance of chelipeds may be different in these groups. Quelipeds play important role on food capture and on agonistic, social and reproductive behavior. Therefore, inter and intraspecific interactions may change during prawn growth, even after morphological

  10. Idade e crescimento de Callinectes danae e C. ornatus (Crustacea, Decapoda na Baía de Guanabara, Rio de Janeiro, Brasil Age and growth of Callinectes danae and C. ornatus (Crustacea, Decapoda in Guanabara Bay, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Karina A. Keunecke

    2008-06-01

    Full Text Available Callinectes danae Smith, 1869 e C. ornatus Ordway, 1863 constituem uma parcela importante da produção pesqueira na Baía de Guanabara. Ambas espécies compõem uma fração significativa da fauna-acompanhante sendo exaustivamente descartadas pelas pescarias de arrasto de camarões na costa brasileira. As curvas de crescimento de C. danae e C. ornatus foram calculadas por meio da análise de progressão modal. Para estimar os parâmetros biológicos, foi aplicado o modelo de crescimento de Bertalanffy e para estimar a longevidade foi usada a sua fórmula inversa. As curvas de crescimento foram: ♂ LC = 120 (1 - e -0,005t , ♀ LC = 113 (1 - e -0,005t; ♂ LC = 94 (1 - e -0,005t e ♀ LC = 110 (1 - e -0,005t , respectivamente para C. danae e C. ornatus. A longevidade alcançada para as duas espécies foi em torno de 2,5 anos, além de validar as curvas de crescimento. O estudo do crescimento em crustáceos é de extrema importância, pois além de fornecer a informação biológica básica para o grupo, os parâmetros estimados subsidiam o ordenamento e manejo pesqueiro das espécies exploradas.Callinectes danae Smith, 1869 and C. ornatus Ordway, 1863 constitute an important portion from the fishing products at Guanabara Bay. Both species compose a significant by-catch fraction being a lot discarded during shrimp trawlings along Brazilian coast. Growth curves were estimated by modal progression analysis. For the biological parameters it was applied the Bertalanffy growth function and for the age it was used its inverse formula. Growth curves of C. danae and C. ornatus were respectively: ♂ LC = 120 (1 - e -0,005t, ♀ LC = 113 (1 - e -0,005t; ♂ LC = 94 (1 - e -0,005t and ♀ LC = 110 (1 - e -0,005t. The age for both species reached around 2.5 years, besides to confirm growth curves. Growth study in crustaceans is very important, because besides supplying biological information it subsidizes fishery management for exploted species.

  11. Infeccion natural de Ptychophallus tristani (Crustacea: decapoda con metacercarias de Paragonimus mexicanus (Trematoda en Tabarcia de Mora, Costa Rica

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    Eduardo Monge

    1985-02-01

    Full Text Available Se determinó el grado de infección de los crustáceos Ptychophallus tristani presentes en una área endémica de Paragonimus mexicanus, encontrándose que de un total de 182 cangrejos, 161 resultaron positivos (88,5% por metacercarias. Al comparar la infección entre machos y hembras no se encontró diferencias estadísticamente significativas y en relación a su tamaño se observó una relación directa entre tamaño y porcentaje y grado de infección. Se estableció que no existen diferencias significativas en relación a la época del año en que los cangrejos fueron capturados lo que epidemiológicamente es importante pues indica que las fuentes de infección permanecen potencialmente activas durante todo el año.

  12. The trophic position of the alien crab Rhithropanopeus harrisii (crustacea decapoda panopeidae) in the Taman Bay, Sea of Azov community

    Science.gov (United States)

    Zalota, A. K.; Kolyuchkina, G. A.; Tiunov, A. V.; Biriukova, S. V.; Spiridonov, V. A.

    2017-03-01

    This work concerns the trophic web positioning of the alien crab Rhithropanopeus harrisii and other common marine invertebrate species and fishes in the benthic ecosystem of the shallows of Taman Bay, Sea of Azov. The base of the trophic web in this system is composed of phytoplankton, macrophytes (algae and marine grasses), and reeds that use atmospheric carbon for photosynthesis. Analysis of the isotopic composition of nitrogen and carbon has shown that although marine grasses are dominating primary producers in the shallows of the bay, primary consumers (such as Cerastoderma glaucum, Porifera gen. sp., Gammarus aequicauda, Deshayesorchestia deshayesii and Idotea balthica) only partially use this organic source; instead, they use a combination of different sources of primary production. It has been shown that the food source of the alien crab is primarily of animal origin. In Taman Bay, R. harrisii is on the same trophic level as other carnivores/scavengers: benthic fishes Syngnathus nigrolineatus, Gobius spp. and native crab Pilumnus hirtellus and shrimp Palaemon adspersus.

  13. Damage caused during hypoxia and reoxygenation in the locomotor muscle of the crab Neohelice granulata (Decapoda: Varunidae).

    Science.gov (United States)

    Geihs, Márcio Alberto; Vargas, Marcelo Alves; Nery, Luiz Eduardo Maia

    2014-06-01

    The aim of this work was to determine whether different durations of severe hypoxia (0.5 mg O2 L(-1)) followed by reoxygenation cause damage to the locomotor muscle of the crab Neohelice granulata. We evaluated reactive oxygen species (ROS), lipid peroxidation (LPO), mitochondrial membrane potential, and aerobic fiber area of the locomotor muscle after different periods of hypoxia (1, 4, or 10h) followed by 30 or 120 min of reoxygenation. Additionally, changes in cell volume, mitochondrial dysfunction, and infiltration of hemocytes were evaluated after hypoxia and a subsequent 2, 24, or 48 h of reoxygenation. After hypoxia, neither ROS nor LPO increased. However, mitochondrial membrane potential and aerobic fiber area decreased in a time-dependent manner. After reoxygenation, the ROS and LPO levels increased and mitochondrial membrane potential decreased, but these quickly recovered in crabs exposed to 4h of hypoxia. On the other hand, alterations of mitochondria resulted in morphological changes in aerobic fibers, which required more time to recover during reoxygenation after 10h of hypoxia. The locomotor muscles of the crab N. granulata suffer damage after hypoxia and reoxygenation. The intensity of this damage is dependent on the duration of hypoxia. In all experimental situations analyzed, the locomotor muscle of this crab was capable of recovery.

  14. Identification, Characterization, and Diel Pattern of Expression of Canonical Clock Genes in Nephrops norvegicus (Crustacea: Decapoda) Eyestalk

    Science.gov (United States)

    Sbragaglia, Valerio; Lamanna, Francesco; M. Mat, Audrey; Rotllant, Guiomar; Joly, Silvia; Ketmaier, Valerio; de la Iglesia, Horacio O.; Aguzzi, Jacopo

    2015-01-01

    The Norway lobster, Nephrops norvegicus, is a burrowing decapod with a rhythmic burrow emergence (24 h) governed by the circadian system. It is an important resource for European fisheries and its behavior deeply affects its availability. The current knowledge of Nephrops circadian biology is phenomenological as it is currently the case for almost all crustaceans. In attempt to elucidate the putative molecular mechanisms underlying circadian gene regulation in Nephrops, we used a transcriptomics approach on cDNA extracted from the eyestalk, a structure playing a crucial role in controlling behavior of decapods. We studied 14 male lobsters under 12–12 light-darkness blue light cycle. We used the Hiseq 2000 Illumina platform to sequence two eyestalk libraries (under light and darkness conditions) obtaining about 90 millions 100-bp paired-end reads. Trinity was used for the de novo reconstruction of transcriptomes; the size at which half of all assembled bases reside in contigs (N50) was equal to 1796 (light) and 2055 (darkness). We found a list of candidate clock genes and focused our attention on canonical ones: timeless, period, clock and bmal1. The cloning of assembled fragments validated Trinity outputs. The putative Nephrops clock genes showed high levels of identity (blastx on NCBI) with known crustacean clock gene homologs such as Eurydice pulchra (period: 47%, timeless: 59%, bmal1: 79%) and Macrobrachium rosenbergii (clock: 100%). We also found a vertebrate-like cryptochrome 2. RT-qPCR showed that only timeless had a robust diel pattern of expression. Our data are in accordance with the current knowledge of the crustacean circadian clock, reinforcing the idea that the molecular clockwork of this group shows some differences with the established model in Drosophila melanogaster. PMID:26524198

  15. Seasonal variations in larval biomass and biochemical composition of brown shrimp, Crangon crangon (Decapoda, Caridea), at hatching

    Science.gov (United States)

    Urzúa, Ángel; Anger, Klaus

    2013-06-01

    The "brown shrimp", Crangon crangon (Linnaeus 1758), is a benthic key species in the North Sea ecosystem, supporting an intense commercial fishery. Its reproductive pattern is characterized by a continuous spawning season from mid-winter to early autumn. During this extended period, C. crangon shows significant seasonal variations in egg size and embryonic biomass, which may influence larval quality at hatching. In the present study, we quantified seasonal changes in dry weight (W) and chemical composition (CHN, protein and lipid) of newly hatched larvae of C. crangon. Our data revealed significant variations, with maximum biomass values at the beginning of the hatching season (February-March), a decrease throughout spring (April-May) and a minimum in summer (June-September). While all absolute values of biomass and biochemical constituents per larva showed highly significant differences between months ( P additive models (GAM), key variables of embryonic development exerted significant effects on larval condition at hatching: The larval carbon content (C) was positively correlated with embryonic carbon content shortly after egg-laying ( r 2 = 0.60; P Additionally, water temperature ( r 2 = 0.57; P food availability (phytoplankton C; r 2 = 0.39; P effects persisting from the embryonic to the larval phase. Since "winter larvae" are more likely exposed to poor nutritional conditions, intraspecific variability in larval biomass at hatching is interpreted as part of an adaptive reproductive strategy compensating for strong seasonality in plankton production and transitory periods of larval food limitation.

  16. The effect of the macroconsumer Aegla longirostri (Crustacea, Decapoda on the invertebrate community in a subtropical stream

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    Gláucia Bolzan Cogo

    2014-06-01

    Full Text Available AIM: This study tested whether the macroconsumer Aegla longirostri is able to modify the invertebrate community associated with decomposing leaves. METHODS: The study was performed in a first-order stream located in central Rio Grande do Sul state. Two types of channels containing leaf litter of Ficus luschnathiana were placed in the stream; one type allowed aeglids to access the leaf litter (PA, and the other type did not (AA. Both types allowed aquatic insects to access the leaf litter. In addition, a control treatment (C was established, in which no channel was used. After 3, 7, 11, 15 and 19 days, a litter bag was removed from each replicate of each treatment. RESULTS: A total of 926 organisms belonging to 19 families were identified. The most common taxon in all treatments was Chironomidae, which comprised 71% of the total and was represented by 16 genera. The presence of aeglids decreased the total abundance of organisms by 89% and the taxonomic richness by 35%. The presence of A. longirostri altered the taxonomic composition of the invertebrates and the structure of the trophic groups, causing a decrease in the abundance of all groups, except for shredders and predators. The gathering-collectors trophic group was the most important (65%, in both the presence and absence of A. longirostri. CONCLUSION: Our study showed that A. longirostri, as well as other macroconsumers, was able to modify the structure of the invertebrate community associated with decomposing leaves in the stream.

  17. Growth and reproduction of the mangrove crab Goniopsis cruentata (Latreille, 1803 (Crustacea: Decapoda: Grapsidae in southeastern Brazil

    Directory of Open Access Journals (Sweden)

    Carla R.G. Reis

    2015-06-01

    Full Text Available Goniopsis cruentata is a common semi-terrestrial crab in Brazilian mangroves and an important fishery resource for traditional communities in the northeastern Brazilian coast. Aiming to contribute to the knowledge about the species, this study evaluated the carapace width and weight growth curves, the relative growth of weight versus carapace width, and the temporal variation of gonadosomatic and hepatosomatic indices for the species. A total of 524 crabs were collected in a mangrove area of Ubatuba municipality, state of São Paulo. The growth-curves parameters and longevity (tmax were estimated for males (CW∞=50.6 mm, WE=56.4 g, k=2.24, t0=0.003631502 year-1, tmax=1.3 years and females (CW∞=50.7 mm, WE∞=58.8 g, k=2.50, t0=0.003247209 year-1, tmax=1.2 years. The age at onset of sexual maturity was 0.23 years for both genders. The weight-growth model was isometric for the immature developmental stages and allometric negative for adults. The species exhibited a continuous reproduction, with breeding peaks in spring and summer months. The weight dynamics of gonads and hepatopancreas were not clearly related. The growth and reproductive patterns indicated that Goniopsis cruentata has a life-history that prioritizes reproduction instead of survival. The species exhibited some of the highest growth rates and lowest longevity estimates reported for brachyuran species in Brazil.

  18. Re-evaluation of the Cancridae Latreille, 1802 (Decapoda: Brachyura) including three new genera and three new species

    NARCIS (Netherlands)

    Schweitzer, Carrie E.; Feldmann, Rodney M.

    2000-01-01

    New fossils referable to the Cancridae Latreille, 1802 extend the known stratigraphic range of the family into the middle Eocene and the geographic range into South America. Each genus within the family has been reevaluated within the context of the new material. A suite of diagnostic characters for

  19. A ten-month diseases survey on wild Litopenaeus setiferus (Decapoda: Penaeidae from Southern Gulf of Mexico

    Directory of Open Access Journals (Sweden)

    Rodolfo Enrique del Río-Rodríguez

    2013-09-01

    Full Text Available The development of shrimp aquaculture in Mexican coasts of the Gulf of Mexico began to be explored using the Pacific white shrimp Litopenaeus vannamei in the mid 90´s. Many concerns over the risk of disease transmission to the economically important native penaeids, have been the main deterrent for the aquaculture of L. vannamei in the region. Concurrently, more than 10 years of research experience on the aquaculture suitability of the native Litopenaeus setiferus from the Terminos Lagoon, in the Yucatán Peninsula, have been accumulated. The aim of this study was then to determine the seasonal variations of the naturally acquired diseases and the possible detection of exotic pathogens. For this, random subsamples (n~60 of juveniles L. setiferus were collected from monthly captures. In order to detect the widest range of pathogens, including infectious hypodermal and hematopoietic necrosis (IHHNv and white spot syndrome (WSSv viruses, both histopathological and molecular methods were employed. Monthly prevalence (% was calculated for every finding. We were able to detect a total of 16 distinct histological anomalies, most of which the presump- tive aetiological agent was readily identified. PCR results for viruses were negative. For some pathogens and symbionts, the prevalence was significantly different between the adult and juvenile populations. Prevalence of diseases tended to be higher in juvenile shrimp than in adults. The results of this study indicated that L. setiferus carry a wide variety of pathogens and symbionts that seem to be endemic to penaeids of the Gulf of Mexico, and those juveniles were more conspicuous to acquire pathogens and symbionts than adults.

  20. New Records of Hippolytid Shrimps, Lebbeus speciosus and Lebbeus comanthi (Crustacea: Decapoda: Caridea from the East Sea, Korea

    Directory of Open Access Journals (Sweden)

    Chu Lee

    2013-01-01

    Full Text Available Two species of the hippolytid shrimps, Lebbeus speciosus and Lebbeus comanthi, are described and illustrated for the first time in Korea. They were collected from the East Sea. Lebbeus speciosus was found in a scallop farm of Jumunjin, Gangneung, and L. comanthi associated with crinoids, was found in Gampo, Gyeongju. The difference between these two related species is in the number of dorsal teeth of the rostrum, five teeth in L. speciosus and a single tooth in L. comanthi. The Korean Lebbeus species has increased to 6 species by the present report. They are L. grandimana, L. polaris, L. unalaskensis, L. groenlandicus, L. speciosus, and L. comanthi.

  1. A new species of the ghost shrimp genus Lepidophthalmus (Crustacea: Decapoda: Axiidea) from the southwestern Gulf of Mexico.

    Science.gov (United States)

    Felder, Darryl L

    2015-07-13

    A new species of Lepidophthalmus lacking a ventral median sclerite on the second abdominal somite is described from coastal waters of the southwestern Gulf of Mexico. Lepidophthalmus statoni sp. nov., originally recognized only as a unique population in allozyme studies, is sympatric with the ventrally plated species Lepidophthalmus manningi Felder & Staton, 2000, but more closely resembles Lepidophthalmus louisianensis (Schmitt, 1935) from the northern and northwestern Gulf of Mexico. Apparently restricted to intertidal and shallow subtidal tropical waters, the new species is known to range from western Campeche to middle-upper reaches of Veracruz, Mexico. As many members of the genus, it commonly inhabits euryhaline inlets, estuaries, and protected shorelines, including richly organic muddy to clayey sands and sandy muds adjacent to shoreline vegetation. Coloration is documented and discussed as a tool to facilitate field identifications, as are morphological characters.

  2. Efecto de la macroalga Caulerpa sertularioides en el desarrollo del camarón Penaeus californiensis (Decapoda: Peneidae

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    Marco Antonio Porchas Cornejo

    1999-09-01

    Full Text Available El efecto de la macroalga Caulerpa sertularioides sobre el crecimiento, sobrevivencia y producción en cautiverio del camarón café Penaeus californiensis (Holmes, 1900 a temperaturas invernales (14 a 21°C se estudió en La Paz, B.C.S., México. Se utilizaron nueve unidades experimentales (Tres por el tratamiento consistiendo en tanques plásticos de150 l de capacidad. El crecimiento del camarón con la presencia directa de la macroalga fue de 3.98 ± 0.4 g después de 10 semanas de cultivo, la sobrevivencia fue del 100 % y el rendimiento de 36.24 ± 4.3 g. Estos resultados fueron significativamente más altos que los obtenidos en presencia indirecta, y en ausencia de la macroalga, los cuales no presentaron diferencias significativas entre sí. El crecimiento, sobrevivencia y producción en la presencia indirecta de la macroalga fueron de 0.73 ± 0.4 g, 75± 10% and 7.8 + 1.2 g respectivamente. En ausencia de la macroalga, se obtuvieron valores de 0.46 ± 0.4 g, 68.7 ± 12% y 5.6 ±1.1 g. La presencia directa de la macroalga tiene un efecto positivo y significativo en el desarrollo del camarón café en cautiverio.The effect of the macroalga Caulerpa sertularioides on the growth, survival and yield of captive yellowleg shrimp Penaeus californiensis (Holmes, 1900 at winter temperatures (14 to 21°C was studied at La Paz, B.C.S., México. Nine experimental units (three per treatment consisting in 150 l-fiberglass tanks were used. Shrimp growth with macroalgal presence was 3.98 ± 0.4 g after 10 weeks, survival was 100% and yield 36.24 ± 4.3 g. These results were better than those obtained with indirect presence, and absence of the macroalga, which were not different among themselves. Under indirect macroalgal presence growth, survival and yield were 0.73 ± 0.4 g, 75± 10% and 7.8 ± 1.2 g. Without macroalgae, corresponding values were 0.46 ± 0.4 g, 68.7 ± 12% and 5.6 ±1.1 g. Significant differences were found between "absence" and "indirect presence". The macroalgae possitively affect the development of this shrimp in captivity.

  3. Observaciones sobre la larva del cangrejo marino tropical (Decapoda: Porcellanidae Petrolisthes armatus en el Golfo de Nicoya, Costa Rica

    Directory of Open Access Journals (Sweden)

    Edgardo Díaz-Ferguson

    2008-09-01

    Full Text Available Durante octubre y noviembre de 1998 (estación lluviosa y diciembre, febrero y marzo de 1999 (estación seca se muestreó la distribución de la larva de Petrolisthes spp, así como la densidad del total de las larvas de decápodos en superficie y a 3 metros de profundidad. Los muestreos se realizaron en tres sitios de la zona de Punta Morales, Golfo de Nicoya, Costa Rica, por medio de arrastres con una red de plancton de 280 µm. Se recolectaron un total de 6014 larvas de decápodos de las cuales 73 (1.21% pertenecían al género Petrolisthes spp. No se encontraron diferencias significativas entre estaciones (p > 0.05, sin embargo fue posible observar una mayor densidad tanto de P. armatus como de larvas de decápodos en estación seca. Temporalmente el único parámetro físico-químico que varió significativamente fue la salinidad. En cuanto a la variación espacial no se encontraron diferencias significativas por profundidad, ni para Petrolisthes spp. ni para larvas de decápodos asociados (p > 0.05, a pesar de que la variación de algunos parámetros como la temperatura y el oxígeno si lo fue. Entre mareas se encontraron diferencias significativas para las larvas de Petrolisthes spp., no así para larvas de decápodos. Para la especie estudiada se observó un mayor número de larvas en marea baja. Entre los sitios hubo diferencias significativas para las larvas de decápodos, pero no para Petrolisthes spp.; físico-químicamente estos sitios son muy parecidos y solo difieren en penetración de luz, lo que parece no afectar a la larva de Petrolisthes. spp. Los resultados demuestran que el principal factor que regula la concentración temporal de las larvas es la salinidad, mientras que espacialmente las oscilaciones en el flujo mareal son de mayor importancia. Debido a las diferencias observadas marealmente para la concentración de larvas se propone el siguiente mecanismo: P. armatus libera sus larvas en el máximo de marea, éstas salen hacia fuera de la costa con la marea baja y se reincorporan con la marea alta, cuando están cerca de la fase previa al asentamiento (la megalopa. Adicional a los resultados en el medio natural para esta especie también se estudió en el laboratorio la duración del periodo larval y la supervivencia de las larvas a salinidades extremas utilizándose los valores máximos y mínimos registrados en el medio natural (15 ups y 35 ups. Este ensayo demostró que las larvas presentan un mayor porcentaje de supervivencia en salinidades menores (15 ups y que la duración del período de desarrollo es de 19 dias.Observations on the larvae of the tropical marine crab Petrolisthes armatus in the Gulf of Nicoya, Costa Rica. During October and November 1998 (rainy season, and December, February and March 1999 (dry season, larvae distribution of Petrolisthes armatus and associated decapods were sampled in three different sites at the Punta Morales peninsula, Gulf of Nicoya, Costa Rica. A total of 6014 decapod larvae were collected, and 73 belonged to the genus Petrolisthes spp. No significant total larval density differences were found between seasons (p>0.05; but there was a greater density of P. armatus and other decapod larvae (p>0.05 during the dry season. In addition, no significant variations on temperature and oxygen concentration were observed. P. armatus larval abundance was higher during low tide, in contrast with other decapod larvae. Significant differences among sites were found for other decapod larvae, but not for P. armatus. The only parameter that varied significantly between seasons was salinity and results demonstrate that this factor regulates temporal concentration of larvae. Moreover, flow-tide oscillations were the most important spatial factor in larval dynamics. We propose this mechanism: P. armatus liberates larvae during high tide; these larvae leave the coastal area during low tide and return to the rocky intertidal ecosystem during high tide, when they are ready to settle as megalopa (pre-juvenile stage. Parallel laboratory observations showed higher survival rates at lower salinities (15 ups against 35 ups and that the duration of the period from zoea I to megalopa was, in average, 19 days. Rev. Biol. Trop. 56 (3: 1209-1223. Epub 2008 September 30.

  4. Apparent carbohydrate and lipid digestibility of feeds for whiteleg shrimp, Litopenaeus vannamei (Decapoda: Penaeidae, cultivated at different salinities

    Directory of Open Access Journals (Sweden)

    Milena Gucic

    2013-09-01

    Full Text Available Whiteleg shrimp, Litopenaeus vannamei is one of the most commercially farmed species worldwide because of its fast growth, good survival rate at high farming densities, and osmoregulatory capacity, which makes it an excellent candidate for cultures at different salinities. The knowledge of shrimp nutritional requirements is critical in the formulation of diets to allow optimal growth at different environmental conditions and development stages. The effect of salinity on apparent digestibility of shrimp feed is not well known, and this information is required in shrimp diet formulation. For this purpose, the apparent digestibility coefficients of carbohydrates (ACD and lipids (ALD were determined for juvenile whiteleg shrimps under controlled culture conditions. We evaluated the apparent digestibility of six commercial (D1:37CP, D2:38CP, D3:39CP, D4:34CP, D5:35CP, and D6:37CP and two experimental (E1:33CP and E2:33CP diets for juvenile whiteleg shrimp cultivated at three salinities (5, 35 and 50psu in 60L aquariums. ACD and ALD were determined in vivo using chromic oxide as an inert marker. Our results showed that ALD in most cases was over 80%, independent of salinity, except the E1:33CPdiet which had 74.0% at 50psu. Diet D3:39CP showed the highest ALD coefficient (90.1 and 90.6% at 5 and 35psu, respectively. For ACD, differences were detected between commercial and experimental diets at every salinity level, although salinity effect on ACD was not significant. Diet D4:34CP had the highest coefficient (92.4% at 5psu, and E2:33CP at 35 and 50psu (97.3 and 94.7%. This study demonstrated that there is no significant effect of saline variations on carbohydrate and lipid digestibility by juvenile whiteleg shrimp, under the experimental conditions. Rev. Biol. Trop. 61 (3: 1201-1213. Epub 2013 September 01.

  5. Population structure, sex ratio and growth of the seabob shrimp Xiphopenaeus kroyeri (Decapoda, Penaeidae) from coastal waters of southern Brazil

    Science.gov (United States)

    Grabowski, Raphael Cezar; Simões, Sabrina Morilhas; Castilho, Antonio Leão

    2014-01-01

    Abstract This study evaluated the growth and population structure of Xiphopenaeus kroyeri in Babitonga Bay, southern Brazil. Monthly trawls were conducted from July 2010 through June 2011, using a shrimp boat outfitted with double-rig nets, at depths from 5 to 17 m. Differences from the expected 0.5 sex ratio were determined by applying a Binomial test. A von Bertalanffy growth model was used to estimate the individual growth, and longevity was calculated using its inverted formula. A total of 4,007 individuals were measured, including 1,106 juveniles (sexually immature) and 2,901 adults. Females predominated in the larger size classes. Males and females showed asymptotic lengths of 27.7 mm and 31.4 mm, growth constants of 0.0086 and 0.0070 per day, and longevities of 538 and 661 days, respectively. The predominance of females in larger size classes is the general rule in species of Penaeidae. The paradigm of latitudinal-effect does not appear to apply to seabob shrimp on the southern Brazilian coast, perhaps because of the small proportion of larger individuals, the occurrence of cryptic species, or the intense fishing pressure in this region. The longevity values are within the general range for species of Penaeidae. The higher estimates for longevity in populations at lower latitudes may have occurred because of the growth constants observed at these locations, resulting in overestimation of this parameter. PMID:25561841

  6. Genetic structure of the sea-bob shrimp (Xiphopenaeus kroyeri Heller, 1862; Decapoda, Penaeidae along the Brazilian southeastern coast

    Directory of Open Access Journals (Sweden)

    Carolina Moreira Voloch

    2005-01-01

    Full Text Available The sea-bob shrimp, Xiphopenaeus kroyeri, is one of the most important economic marine resources along the entire Brazilian coast. Nevertheless, despite its economic importance, no studies have examined the population genetics of this species. In this paper, we used ten allozyme loci to study the pattern of genetic structuring in X. kroyeri along the southeastern Brazilian coast. Seven of the ten analyzed loci were polymorphic, yielding observed heterozygosity values higher than those reported for other penaeid shrimps. The population from São Paulo was significantly different from the other two populations (Rio de Janeiro and Espírito Santo, which, in turn, seem to form a single panmitic unit. Therefore, our results clearly indicate that conservation policies for this species should consider the São Paulo population as an independent stock from those of Rio de Janeiro and Espírito Santo.

  7. Abundance and spatial-temporal distribution of the shrimp Xiphopenaeus kroyeri (Decapoda: Penaeidae): an exploited species in southeast Brazil.

    Science.gov (United States)

    Silva, E R; Sancinetti, G S; Fransozo, A; Azevedo, A; Costa, R C

    2016-04-19

    This study evaluated the abundance and spatial-temporal distribution of the shrimp Xiphopenaeus kroyeri in the coastal region of Macaé, state of Rio de Janeiro, southeastern Brazil. Monthly samples were obtained from March 2008 to February 2010 in six stations located in Inner (5, 10 and 15m depth) and Outer (25, 35 and 45m depth) areas. It was used a commercial fishery boat equipped with an otter-trawl net (3.5 m mouth width, mesh size 20mm and 15mm in the cod end). Water samples were taken for determination of temperature and salinity, and sediment samples for determination of texture and organic matter content. A total of 7146 shrimps were sampled. About 95% of all shrimps were caught in the shallow area, i.e., depths <20m. Greatest abundances were recorded in winter and spring. No significant correlation was observed between sediment (phi) and abundance. The distribution of X. kroyeri in the studied area was closely related to seasonal cold waterfront of the South Atlantic Central Water (SACW) and temperature was the main factor affecting the species abundance.

  8. Two new species and two new records of deep-water caridean shrimps from Brazil (Decapoda: Pandalidae, Palaemonidae, Crangonidae).

    Science.gov (United States)

    Anker, Arthur; Pachelle, Paulo P G; Tavares, Marcos

    2014-01-01

    The present study deals with four species of benthic deep-water caridean shrimps collected on the continental slope off southeastern Brazil, between 360 m and 900 m. The deepwater pandalid Bitias stocki Fransen, 1990, previously known only from a few localities in the eastern Atlantic, is reported for the first time from the western Atlantic (Brazil). The Brazilian material of B. stocki also represents the first record of the genus Bitias Fransen, 1990 in the western Atlantic. The palaemonid Periclimenes tenellus (Smith, 1882), previously known only from South Carolina and New Jersey, USA, is reported for the first time from Brazil, representing a considerable range extension of this uncommon species into the southwestern Atlantic. Another deepwater palaemonid shrimp is described as new: Periclimenes bathyalis sp. nov. The new species is morphologically closest to the echinoid associates Periclimenes milleri Bruce, 1986 and Periclimenes ingressicolumbi Berggren & Svane, 1989. Finally, the bizarre deepwater crangonid genus Prionocrangon Wood-Mason in Wood-Mason & Alcock, 1891 is reported for the first time from Brazil and the southwestern Atlantic, where it is represented by a new species, Prionocrangon brasiliensis sp. nov.

  9. [Microorganisms effect with probiotic potential in water quality and growth of the shrimp Litopenaeus vannamei (Decapoda: Penaeidae) in intensive culture].

    Science.gov (United States)

    Melgar Valdes, Carolina Esther; Barba Macías, Everardo; Alvarez-González, Carlos Alfonso; Tovilla Hernández, Cristian; Sánchez, Alberto J

    2013-09-01

    The use of probiotics has gained acceptance in aquaculture, particularly in maintaining water quality and enhancing growth in organisms. This study analyzed the effect of the commercial (EM, Japan) natural product composed by (Rhodopseudomonas palustris, Lactobacillus plantarum, Lactobacillus casei and Saccharomyces cerevisiae) added to the water, in order to determine its effect in water quality, sediment and growth of L. vannamei under intensive culture. The evaluation included three treatments with a weekly addition of EM: i) tanks without probiotics (C), ii) tanks with a dose of 4 L/ha (EM1) and iii) tanks with a dose of 10 L/ha (EM2). The treatment C was carried out three times, while treatments EM1 and EM2 were carried out four times. A total of 4 350 shrimps were measured for total length and weight, to calculate total and porcentual weight gain, daily weight gain, specific growth rate (TCE), and food conversion factor (FCA); besides, the survival rate was estimated. The use of probiotics allowed a shorter harvest time in treatments EM1 (90 d) and EM2 (105 d) with relation to the treatment C (120d). Treatments EM1 and EM2 were within the recommended intervals for culture, with respect to treatment C. The use of probiotic bacteria significantly regulated pH (EM1, 8.03 +/- 0.33; EM2, 7.77 +/- 0.22; C, 9.08 +/- 0.35) and reduced nitrate concentration (EM1, 0.64 +/- 0.25 mg/L; EM2, 0.39 +/- 0.26 mg/L; C, 0.71 mg/L). Water pH mostly explained the variance with respect to the treatments. Treatment EM2 presented the greatest removal of organic matter (1.77 +/- 0.45%), whereas the contents of extractable phosphorus increased significantly in treatment EM1 with 21.6 +/- 7.99 mg/kg and in treatment EM2 with 21.6 +/- 8.45 mg/kg with control relation (14.3 +/- 5.47). The shrimp growth was influenced by dissolved oxygen, salinity and pH in the sediment, establishing that salinity was the most important variable in the weight with a negative association. Treatment EM1 recorded an improved TCE (2.69 +/- 0.35%/d) and FCA (1.46 +/- 0.20) with relation to the control treatment (TCE, 1.88 +/- 0.25%/d; FCA, 2.13 +/- 0.48). Survival was significantly greater in treatments containing probiotics with 61 +/- 8.76% and 60 +/- 10.5% for EM1 and EM2, respectively. This study indicated the positive effect obtained with the use of this commercial probiotic, to improve culture conditions and growth parameters in an intensive culture of L. vannamei.

  10. The Effect of the Crayfish Orconectes virilis (Crustacea: Decapoda: Cambaridae) in the Decomposition and Succession of Submerged Small Mammal Carrion

    Science.gov (United States)

    de Jong, G. D.; Chadwick, J. W.

    2005-05-01

    The role of the crayfish Orconectes virilis in the decomposition of submerged rat carrion and succession of other benthic macroinvertebrates was experimentally investigated in Slaughterhouse Gulch, a small, urban stream in Littleton, Colorado. Crayfish participation in carrion decomposition significantly altered the decomposition rate of the carrion. Nine carcasses were exposed in anchored minnow traps at three degrees of crayfish access: crayfish always present, crayfish having free access, and crayfish excluded. These three treatments required 23 days, 29 days, and 65 days, respectively, for complete decomposition of the rat carrion (carrion, being present in densities of <5 individuals/carcass early in succession and in larger densities (up to 25 individuals/carcass) after extensive decomposition and exposure of the viscera.

  11. Population genetic structure of Brazilian shrimp species (Farfantepenaeus sp., F. brasiliensis, F. paulensis and Litopenaeus schmitti: Decapoda: Penaeidae

    Directory of Open Access Journals (Sweden)

    Jaqueline Gusmão

    2005-03-01

    Full Text Available Penaeid shrimps are important resources for worldwide fisheries and aquaculture. In the Southwest Atlantic, Farfantepenaeus brasiliensis, F. paulensis, F. subtilis, Farfantepenaeus sp. and Litopenaeus schmitti are among the most important commercially exploited species. Despite their high commercial value, there is little information available on the different aspects of their biology or genetics and almost no data on their stock structure. We used allozymes to estimate variability levels and population genetic structure of F. brasiliensis, F. paulensis, L. schmitti and the recently detected species Farfantepenaeus sp. along as much as 4,000 km of Brazilian coastline. No population heterogeneity was detected in F. brasiliensis or L. schmitti along the studied area. In contrast, F ST values found for Farfantepenaeus sp. and F. paulensis indicate that the populations of those two species are genetically structured, comprising different fishery stocks. The largest genetic differences in F. paulensis were found between Lagoa dos Patos (South and the two populations from Southeast Brazil. In Farfantepenaeus sp., significant differences were detected between the population from Recife and those from Fortaleza and Ilhéus.

  12. Zooplankton standing and diversity in the Gulf of Kachchh with special reference to larvae of decapoda and pisces

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.; Devi, C.B.L.; Nair, V.R.; Ramaiah, Neelam; Gajbhiye, S.N.

    mystax, and Clupeids were the most common fish larvae present in this area. The major species of larvae of prawns and fishes occurring in the gulf were compared with the adults caught from the area. The environmental parameters like salinity, temperature...

  13. Cloning and sequencing analysis of three amylase cDNAs in the shrimp Penaeus vannamei (Crustacea decapoda): evolutionary aspects.

    Science.gov (United States)

    Van Wormhoudt, A; Sellos, D

    1996-05-01

    In Penaeus vannamei, alpha-amylase is the most important glucosidase and is present as at least two major isoenzymes which have been purified. In order to obtain information on their structure, a hepatopancreas cDNA library constructed in phage lambda-Zap II (Strategene) was screened using a synthetic oligonucleotide based on the amino acid sequence of a V8 staphylococcal protease peptide of P. vannamei alpha-amylase. Three clones were selected: AMY SK 37 (EMBL sequence accession number: X 77318) is the most complete of the analyzed clones and was completely sequenced. It contains the complete cDNA sequence coding for one of the major isoenzymes of shrimp amylase. The deduced amino acid sequence shows the existence of a 511-residue-long pre-enzyme containing a highly hydrophobic signal peptide of 16 amino acids. Northern hybridization of total RNA with the amylase cDNA confirms the size of the messenger at around 1,600 bases. AMY SK 28, which contains the complete mature sequence of amylase, belonged to the same family characterized by a common 3' terminus and presented four amino acid changes. Some other variants of this family were also partially sequenced. AMY SK 20 was found to encode a minor variant of the protein with a different 3' terminus and 57 amino acid changes. Phylogenetic analysis established with the conserved amino acid regions of the (beta/alpha) eight-barrel domain and with the total sequence of P. vannamei showed close evolutionary relationships with mammals (59-63% identity) and with insect alpha-amylase (52-62% identity). The use of conserved sequences increased the level of similarity but it did not alter the ordering of the groupings. Location of the secondary structure elements confirmed the high level of sequence similarity of shrimp alpha-amylase with pig alpha-amylase.

  14. Molecular cloning of Ras cDNA from Penaeus japonicus (Crustacea, decapoda): geranylgeranylation and guanine nucleotide binding.

    Science.gov (United States)

    Huang, C F; Chuang, N N

    1998-12-11

    A cDNA was isolated from the shrimp Penaeus japonicus by homology cloning. The shrimp hepatopancreas cDNA encodes a 187-residue polypeptide whose predicted amino acid sequence shares 85% homology with mammalian K-Ras 4B protein and demonstrates identity in the guanine nucleotide binding domains. Expression of the shrimp cDNA in Escherichia coli yielded a 21-kDa polypeptide with a positive reactivity towards the monoclonal antibodies against mammalian Ras. The GTP binding of the shrimp ras-encoded fusion protein was approximated to be 30000units/mg of protein, whereas the binding for GDP was 5000units/mg of protein. Fluorography analysis demonstrated that the prenylation of both shrimp Ras GDP and shrimp Ras GTP by protein geranylgeranyltransferase I of shrimp Penaeus japonicus exceeded the shrimp Ras nucleotide-free form by 10-fold, and fourfold, respectively; that is, the shrimp protein geranylgeranyltransferase I prefers to react with the shrimp ras-encoded p25 fusion protein in the GDP-bound form.

  15. La pesquería de Penaeus stylirostris (Decapoda: Penaeidae) en el Golfo de Nicoya, Costa Rica

    OpenAIRE

    Palacios, J. A.; Angulo, R.; J.A. Rodríguez

    2015-01-01

    A cohort analysis was perfonned for Penaeus stylirostris Stimpson, 1871 in the inner Gulf of Nicoya. Overfishing is evident for males 150-160 mm and in females over 170 mm in length. These groups also showed the highest instantaneous mortality cates. Higher catches are for sizes 130-140 mm. The small-scale fishing fleet reportedIy caught 29 457 Kg of white shrimp (Penaeus occidentalis Streets, 1871 y P. stylirostris) equivalent to US $ 558 210. During August 427 708 kg of shrimp were caught i...

  16. Embryo production in the sponge-dwelling snapping shrimp Synalpheus apioceros (Decapoda, Alpheidae) from Bocas del Toro, Panama

    Science.gov (United States)

    Rebolledo, Adriana P.; Wehrtmann, Ingo S.; Felder, Darryl L.; Mantelatto, Fernando L.

    2014-01-01

    Abstract Caridean shrimps of the genus Synalpheus are abundant and widely distributed in tropical and subtropical regions, but knowledge of their reproductive biology remains scarce. We report reproductive traits of Synalpheus apioceros from Bocas del Toro, Panama, based on collections in August 2011. The 46 ovigerous females that were analyzed ranged in size from 3.8 to 7.4 mm in carapace length. Fecundity varied between 8 and 310 embryos and increased with female size. Females invested 18.6 ± 10.3% of their body weight in Embryo production. Embryo volume increased considerably (77.2%) during embryogenesis, likely representing water uptake near the end of incubation period. Compared to Synalpheus species with abbreviated or direct development, Synalpheus apioceros produced substantially smaller embryos; however, Synalpheus apioceros seems to have a prolonged larval phase with at least five zoeal stages, which may explain the combination of relatively small and numerous embryos. We did not find nonviable, minute, chalky embryos, previously reported for Synalpheus apioceros specimens obtained from the northwestern Gulf of Mexico, which supports the hypothesis that the production of this type of embryos may be a physiological response of this warm-water species to the temperature decrease near to its latitudinal range limit. PMID:25561839

  17. A new species of palaemonid shrimp, Chacella tricornuta spec. nov (Crustacea: Decapoda: Palaemonidae) from the southeastern Gulf of California, Mexico

    NARCIS (Netherlands)

    Hendrickx, M.E.

    1990-01-01

    A new species of the palaemonid shrimp genus Chacella Bruce is described from the Gulf of California, Mexico, in the eastern Pacific, and represents the second known species of this genus. The type-species, Chacella kerstitchi (Wicksten, 1983), was described from a single female captured off the coa

  18. Description of two new species of the genus Automate De Man, 1888 (Crustacea: Decapoda: Caridea) from the South China Sea.

    Science.gov (United States)

    Wang, Yan-Rong; Sha, Zhong-Li

    2017-03-02

    Three species of the genus Automate De Man, 1888 are described herein, including two new species: A. anacanthopusoides sp. nov. and A. spinosa sp. nov.. Automate anacanthopusoides sp. nov. can be easily identified by the presence of a rostrum, the notch on the lower margin of the major chela, the stout minor cheliped and the cutting edge of the pollex not dentate, and by the absence of spines on the ventral margin of the propodus of the third and fourth pereiopod. Automate spinosa sp. nov. can be easily identified by the nearly straight anterior margin of the carapace, and the presence of spines on the ventral margin of the propodus of third and fourth pereiopod. A key of all species of the Automate is provided.

  19. Geographic differences in the carapace shape of the crab Cyrtograpsus affinis (Decapoda: Varunidae and its taxonomic implications

    Directory of Open Access Journals (Sweden)

    Aníbal H. Lezcano

    2011-11-01

    Full Text Available Cyrtograpsus genus was traditionally considered to be composed of three species: C. angulatus, C. altimanus and C. affinis. However, recent studies have found solid evidence suggesting that C. affinis and C. altimanus belong to a single species and hypothesize that the morphological differences which caused this misclassification could be related to different ecophenotypes or life stages. Here we report a geometric morphometrics study on the carapace shape of Cyrtograpsus specimens from the Río de la Plata estuary (36°S and the Nuevo Gulf (42.75°S, testing for shape differences between different sizes (allometry in the two environments. We found that previous morphological descriptions of the two species were associated with different sizes of a continuous, statistically significant allometric shape variation, concluding that C. affinis is a junior synonym of C. altimanus. We also found significant differences in the carapace shape between estuarine and marine environments, suggesting an effect of the environmental variables on carapace shape and a potential adaptive value of this trait.

  20. Breeding biology of shrimp Parapenaeopsis stylifera (Milne Edwards) (Crustacea: Decapoda) along the Neendakara zone, SW coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Sunil, V.; Suryanarayanan, H.

    Investigations on gonado-somatic index, stages of maturity and fecundity of Parapenaeopsis stylifera were carried out from the Neendakara zone, Kerala coast, India for a period of one year. Females with mature ovaries occurred throughout the year...

  1. Crescimento de Callinectes sapidus (Crustacea, Decapoda, Portunidae no estuário da laguna dos Patos, RS, Brasil

    Directory of Open Access Journals (Sweden)

    Leonardo S. Ferreira

    2008-03-01

    Full Text Available Utilizando o método de deslocamento modal para a identificação das idades, estimou-se o crescimento do siri-azul Callinectes sapidus Rathbun, 1896 em duas áreas de pesca no estuário da Lagoa dos Patos. Os indivíduos foram coletados entre fevereiro de 2005 e março de 2006 no Saco da Mangueira e Saco do Arraial por meio de arrasto de rede de portas da pesca artesanal. Coletou-se um total de 2.609 animais, sendo 1.193 machos e 1.416 fêmeas. Para obtenção das curvas de crescimento utilizou-se o modelo de von Bertalanffy. As curvas foram validadas pela sua adequação ao ciclo de vida e aspectos biológicos da espécie. O tamanho máximo de largura de carapaça (LCmáx utilizado foi mantido fixo em todas as análises (LCmáx=162,71mm; ± d.p.=3,10 para machos e LCmáx=157,78mm; ± d.p.=5,45 para fêmeas, sendo esses valores médios das maiores medidas obtidas em mais de 20 anos de coletas no estuário. Os parâmetros de crescimento e longevidade foram estimados para machos (Saco da Mangueira, K=0,0039/dia; t o=-6.07; 1.195 dias; Saco do Arraial, K=0,0041/dia; t o=-5,84; 1.102 dias e fêmeas (Saco da Mangueira, K=0,0040/dia; t o=-6,22; 1.153 dias; Saco do Arraial, K=0,0039/dia; t o=-5.91; 1.181 dias. As curvas de crescimento estimadas nesse trabalho denotam que a espécie atinge o tamanho mínimo de captura praticamente no primeiro ano de vida (120mm.

  2. A new species of the genus Kingsleya from Amazonia, with a modified key for the Brazilian Pseudothelphusidae (Crustacea: Decapoda: Brachyura)

    NARCIS (Netherlands)

    Magalhaes, C.

    1990-01-01

    Abstract: A new species of Pseudothelphusid crab, Kingsleya besti spec. nov., is described from Serra do Curicuriari, northwest of the State of Amazonas, Brazil. A modified dey for identification of the Pseudothelphusid crabs occurring in Brazil is given. Resumo: É descrita uma nova espécie de

  3. Morfología comparada del esqueleto axial en la familia de cangrejos de agua dulce Trichodactylidae (Crustacea: Decapoda: Brachyura

    Directory of Open Access Journals (Sweden)

    Manuel Pedraza

    2015-07-01

    Full Text Available El esqueleto axial es una estructura compleja de origen cuticular, formada a partir de las láminas esclerotizadas de los esternitos y pleuritos torácicos así como por sus invaginaciones internas. Los caracteres de la parte ventral del esqueleto axial, que se reflejan externamente en las líneas de sutura del esternón torácico, son criterios importantes en el actual sistema de supragenerico de Trichodactylidae: (Trichodactylinae y Dilocarcininae (Dilocarcinini + Valdiviini. Con el objetivo de probar esa hipótesis de clasificación fue realizado el estudio anatómico del esqueleto axial de 43 individuos adultos, tanto machos como hembras, pertenecientes a 17 especies de 10 géneros de Trichodactylidae. Para la preparación del material, los individuos fueron diseccionados y sus esqueletos sumergidos, por un periodo de 24 a 48 horas, en una solución caliente de Hidróxido de Potasio (KOH. El análisis anatómico permitió describir un grupo de variaciones en la forma, orientación y conformación del esternón torácico, techo pleural, fragmas ventrales y dorsales, así como de la lámina de unión. De acuerdo con esas características las especies estudiadas fueron reunidas en tres grupos, siendo esas agrupaciones consistentes con la actual propuesta de clasificación de Trichodactylidae en subfamilias y tribus. El presente trabajo resalta la importancia informativa de la morfología del esqueleto axial para la taxonomía de Trichodactylidae.

  4. Feasibility, density and growth of culture of freshwater crayfish (Decapoda: Cherax Quadricarinatus in Sinaloa, México

    Directory of Open Access Journals (Sweden)

    Juan Francisco Arzola González

    2012-09-01

    Full Text Available Feasibility, density and growth of culture of freshwater crayfish (Cherax quadricarinatus in Sinaloa were analyzed between September, 2005 and January, 2006. The densities were 7 (reservoir 1 and 16 (reservoir 2 org/m-2. Applied a method not parametrico (Kruskal-Wallis, the variables of response were density, weight and sex, the experimental unit the reservoirs. Samplings were weekly and 40 lobsters were captured in tubes of PVC. Total and cefalotorácica length ((LT y LC in mm and total weight (PT in g of the organisms were recorded, the biometric correlations were realized and von Bertalanffy estimated the growth for the model of von Bertallanfy. The major average was obtained in 41.2 g to a density of 7 org/m, though her k (growth rate coincided with the reservoirs with 0.30, in addition, the lobsters they presented a growth of isometric type. From the first year, usefulness of $3,419,165.00 obtained, that represented 26.8 % of the total of income, keeping a growth like that supported until the fifth year (2011. The financial evaluation determined that the investment is profitable economically, his analysis of VAN was $9,060,554.00, and in agreement to the financial indicators, this value was ideal for the accomplishment of the project. As indicator of the profitability, the TIR resulted in 66 %, being major that the minimal acceptable rate of performance and concluding the profitability of the culture in 59 %. Likewise, Sinaloa's condition, for his geographical location and the results ofthe growth, the heights, the performance of the lobster and of the financial analysis of the culture, indicated to C. quadricarinatusas an alternative of development in the region, being the lobster of interest in acuiculture of new species in tropical areas, thoughin Sinaloa the investigations are practically void with ends of commercial production.

  5. Acute toxicity of Roundup® herbicide to three life stages of the freshwater shrimp Caridina nilotica (Decapoda: Atyidae)

    Science.gov (United States)

    Mensah, P. K.; Muller, W. J.; Palmer, C. G.

    Glyphosate based herbicides, including Roundup®, are frequently used in the chemical control of weeds and invading alien plant species in South Africa. These herbicides ultimately get into water courses directly or indirectly through processes such as drifting, leaching, surface runoff and foliar spray of aquatic nuisance plants. Despite their widespread use, no water quality guideline exists to protect indigenous South African freshwater organisms from the toxic effects of these herbicides. The toxicity of the herbicide Roundup® was assessed using three different life stages of the freshwater shrimp Caridina nilotica, a prevalent species in South African freshwater ecosystems. Neonate (7 dph and 40 dph) shrimps were exposed to varying concentrations (1.5-50 mg/L acid equivalence (a.e.)) of the herbicide in 48 and 96 h acute toxicity tests in order to determine the most sensitive life-stage. The results showed neonates to be more sensitive to Roundup® than both juveniles and adults with mean 96 h LC 50 values of 2.5, 7.0 and 25.3 mg/L a.e. respectively. The estimated 96 h LC 50 of neonates is much lower than the application rate (20-30 mg/L a.e.), although the application’s impact will depend on the dilution rate of the applied concentration in the environment. All three life-stages of unexposed animals exhibited active and coordinated movement but exposed shrimps were erratic and slow in their movements, with neonates showing most of these behavioral irregularities. This study shows that low levels of the herbicide Roundup® may adversely affect C. nilotica health and survival. Thus, the herbicide should be carefully managed to minimize any negative impact on non-target freshwater organisms.

  6. Effect of astaxanthin and cholesterol on growth, survival, and pigmentation of adult spiny lobster, Panulirus ornatus (Decapoda, Palinuridae

    Directory of Open Access Journals (Sweden)

    Lai V. Hung

    2010-11-01

    Full Text Available Prior research on the spiny lobster Panulirus ornatus (Fabricius, 1798 determined thatintermediate levels of cholesterol are important in diets, but astaxanthin may not be. Here we examinedhow the growth, survival and coloration of spiny lobster were influenced by the inclusion of bothastaxanthin (50, 60 and 70 mg.kg-1 and cholesterol (0.3, 0.4 and 0.5 % in a two factor experiment.Overall, survival was 84.8% with no significant difference among dietary treatments. Lobsters grew thebest when fed the diet containing the lowest cholesterol and greatest astaxanthin of the levels presented.The results of this study point out the need to examine the effects of dietary component addition acrossa range of inclusion levels simultaneously for multiple nutrients.

  7. Scyllarides obtusus spec. nov., the scyllarid lobster of Saint Helena, Central South Atlantic (Crustacea: Decapoda Reptantia: Scyllaridae)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1993-01-01

    A new species of slipper lobster is described from Saint Helena, where the species seems to be endemic. Known under the vernacular name Stump, the species forms the subject of a local fishery, carried out since early times. Previously the species has been identified with various Scyllarides species

  8. Light-dependent genetic and phenotypic differences in the squat lobster Munida tenuimana (Crustacea: Decapoda) along deep continental margins

    Science.gov (United States)

    Aguzzi, J.; Costa, C.; Ketmaier, V.; Angelini, C.; Antonucci, F.; Menesatti, P.; Company, J. B.

    2013-11-01

    The levels of environmental light experienced by organisms during the behavioral activity phase deeply influence the performance of important ecological tasks. As a result, their shape and coloring may experience a light-driven selection process via the day-night rhythmic behavior. In this study, we tested the phenotypic and genetic variability of the western Mediterranean squat lobster (Munida tenuimana). We sampled at depths with different photic conditions and potentially, different burrow emergence rhythms. We performed day-night hauling at different depths, above and below the twilight zone end (i.e., 700 m, 1200 m, 1350 m, and 1500 m), to portray the occurrence of any burrow emergence rhythmicity. Collected animals were screened for shape and size (by geometric morphometry), spectrum and color variation (by photometric analysis), as well as for sequence variation at the mitochondrial DNA gene encoding for the NADH dehydrogenase subunit I. We found that a weak genetic structuring and shape homogeneity occurred together with significant variations in size, with the smaller individuals living at the twilight zone inferior limit and the larger individuals above and below. The infra-red wavelengths of spectral reflectance varied significantly with depth while the blue-green ones were size-dependent and expressed in smaller animals, which has a very small spectral reflectance. The effects of solar and bioluminescence lighting are discussed as depth-dependent evolutionary forces likely influencing the behavioral rhythms and coloring of M. tenuimana.

  9. Complete mitochondrial genome of Australian spiny lobster, Panulirus cygnus (George, 1962) (Crustacea: Decapoda: Palinuridae) from coast of Australia.

    Science.gov (United States)

    Kim, Gyungryul; Yoon, Tae-Ho; Park, Won Gyu; Park, Jung Youn; Kang, Jung-Ha; Park, Hyun; Kim, Hyun Woo

    2016-11-01

    We characterized the total mitochondrial genome of Australian spiny lobster, Panulirus cygnus (George, 1962), which is found along the western coast of Australia. Total mitochondrial genome length of P. cygnus was 15 724 bp, in which 13 proteins, 2 ribosomal RNAs, 22 transfer RNAs, and a putative control region were encoded. Nine and four protein-coding genes are encoded on the H-strand and on the L-strand, respectively. According to the phylogenetic analysis, P. cygnus was most closely related to Panulirus japonicus among the compared six species belonging to Palinuridae. Although overall gene organization was the same, the putative control region (between SrRNA gene and tRNA(Ilel)) is least similar to one another among mitochondrial genomes from the compared six species belonging to Palinuridae.

  10. Structures of ovary and ovarian follicle in flathead lobster,Thenus orientalis (Lund, 1793) (Crustacea: Decapoda: Scyllarida)

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The ovary contains four morphological components : (1) the ovarian wall, (2) therepro ductive epithelium, (3) the cellular layer containing oocytes, oogonia (especially for early-developing ovary) and follicle cells, and (4) the extensions of the ovarian wall. The ovarian wall and its extensions consist of blood vessels, sinuses, muscle cells and others. The extensions of the ovarian wall project into among the follicles and insert on the thick basal membrane of each follicle.From inside to outside, the follicles are composed of four parts: (1) the oocyte, (2) the perivitelline space, (3) the follicle cells, and (4) the basal membrane. The surface of the oocyte during vitellogenesis is folded into numerous long microvilli that project into the perivitelline space between the oocyte surface and the bace of the follicle cell layer. In addition, the plasma membrane of the vitellogenic oocyte contains many pinocytotic pits. The perivitelline space is engorged with more electrondenser material as the development of the follicle. The inclusion of perivitelline space in the mature follicle is named specially as the chorion. The chorion is composed of two region, a thinner exochorion and a thicker endochorion containing electron-dense granular material. The follicle cell layer is composed of a single layer of polygonal follicle cells which exhibit higher synthetic activity. The synthetic product of the follicle cell layer is one source for the inclusion of the perivitelline space.The structures of the ovary and ovarian follicle in T. orientalis show that the exogenously biosynthetic yolk plays important roles in the vitellogenesis.

  11. The early phyllosoma stages of spiny lobster Panulirus echinatus Smith, 1869 (Decapoda: Palinuridae reared in the laboratory

    Directory of Open Access Journals (Sweden)

    FA. Abrunhosa

    Full Text Available The early stages of the Panulirus echinatus were hatched and reared in the laboratory. Ovigerous females were captured in their habitat and carefully transported to the laboratory. Larvae were transferred in a recirculation water tank at a density of 10 larvae.L-1. The larvae were fed on Artemia and gonads of mussel Brachydonts sp. Microalgae Dunaliella viridis was added at a concentration of 150 x 10(4 cell.mL-1. Larvae and exuviae of each zoeal stage were preserved in an alcohol 70% + glycerin (1:1 solution. The phyllosomas moulted eight times; the intermoulting period of each instar averaged about 7 to 10 days. The main morphological changes of each appendage were described in detail, illustrated and compared with previous reports.

  12. Setal morphology of the grooming appendages of Macrobrachium rosenbergii (Crustacea: Decapoda: Caridea: Palaemonidae) and review of decapod setal classification.

    Science.gov (United States)

    Wortham, Jennifer L; Vanmaurik, Lauren N; Wayne Price, W

    2014-06-01

    Setae are vital in grooming activities and aiding in the removal of epibionts and sedimentary fouling from the body surfaces of decapod crustaceans. Thus, the setal structures and their arrangement on the grooming appendages and sensory structures of the commercially important shrimp, Macrobrachium rosenbergii, were examined using scanning electron microscopy. Macrobrachium rosenbergii is extensively grown in aquaculture and exhibits unique male morphological forms, termed morphotypes. The three male morphotypes are termed blue-clawed males, orange-clawed males, and small-clawed or undifferentiated males and all three differ in their dominance, behavior, body morphology, and reproductive success. Seven setal types, two of which have never been described in the literature, are identified on the grooming appendages (third maxillipeds, first, second, and fifth pereopods) and antennae: simple, serrate, serrulate, spiniform, pappose, crinoid, and spinulate. The latter two setae are newly identified. Certain setal types, such as serrate and serrulate setae were located and associated with specific grooming appendages such as the first pereopods. The types of setae on the grooming appendages varied among females and male morphotypes and the novel setal types (crinoid and spinulate) were found only on two of the male morphotypes. A literature review of terminology related to the structure of setae and setal types in decapod crustaceans is offered as the usage of various terms is ambiguous and conflicting in the literature. The intention of this review is to provide future authors with a comprehensive collection of terms and images that can be used to describe various aspects of setal morphology in decapods.

  13. Effect of global warming on the distribution of Lucifer intermedius and L. hanseni (Decapoda) in the Changjiang estuary

    Institute of Scientific and Technical Information of China (English)

    Zengling Ma; Zhaoli Xu; Jin Zhou

    2009-01-01

    We conducted an oceanographic census in 1959, 2002, and 2005 to evaluate changes in the temporo-spatial distribution and abundance of Lucifer intermedius and L. hanseni in the Changjiang estuary. In general, the abundance and frequency of occurrence (OF) for these two species were highest during the summer. We measured a significant change in the abundance and OF between years. The abundance and OF of L. intermedius increased from 3.7 individuals m-3 and 66.67%, respectively, in 1959, to 8.93 individuals m-3 and 85.19%, in 2002. In 1959, L. hanseni was only found during the summer (abundance: 0.01 individuals m-3, OF: 3.70%). However, in 2002, this species was collected during all seasons except the winter. Furthermore, abundance (0.47 individuals m-3) and OF (25.93%) were higher in 2002 than in 1959. Further increases in abundance and OF were measured during cruises during the spring of 2005. We hypothesize that global warm-ing is responsible for the increase in abundance of L. intermedius and L. hanseniand the northward expansion of L. hanseniin the Changjiang estuary. Given our results, monitoring of both species may be useful to evaluate the effects of climate change.

  14. Key to the identification of larvae and postlarvae of the penaeid prawns (Decapoda: Penaeidea) of the Indian Ocean

    Digital Repository Service at National Institute of Oceanography (India)

    Paulinose, V.T.

    Some of the major criteria for identifying the larvae and early postlarvae of the penaeid prawns of the Indian Ocean are presented based on the study on material collected during the International Indian Ocean Expedition (1960-65). The key also...

  15. Changes in body size spectra of benthic caridean shrimps (Decapoda: Caridea) and snails (Gastropoda) as response to seasonal variability

    OpenAIRE

    2016-01-01

    Ecologists have been largely interested in the description and understanding of the power scaling relationships between body size and abundance of organisms. Many studies have focused on estimating the exponents of these functions across taxonomic groups and spatial scales, to draw inferences about the processes underlying this pattern. The exponents of these functions usually approximate -3/4 at geographical scales, but they deviate from this value when smaller spatial extensions are conside...

  16. The leucosiid crabs described by Thomas Bell in 1855: original description and dates of publication (Crustacea: Decapoda: Brachyura).

    Science.gov (United States)

    Lee, B Y; Low, Martyne E Y

    2013-01-01

    Thomas Bell proposed 37 species- and 5 genus-group names for the Leucosiidae in four publications that appeared in 1855. The version appearing in the Proceedings of the Linnean Society of London is the earliest of these publications and the first available description of these taxa.

  17. Phylogenetics of the brachyuran crabs (Crustacea: Decapoda): the status of Podotremata based on small subunit nuclear ribosomal RNA.

    Science.gov (United States)

    Ahyong, Shane T; Lai, Joelle C Y; Sharkey, Deirdre; Colgan, Donald J; Ng, Peter K L

    2007-11-01

    The true crabs, the Brachyura, are generally divided into two major groups: Eubrachyura or 'advanced' crabs, and Podotremata or 'primitive' crabs. The status of Podotremata is one of the most controversial issues in brachyuran systematics. The podotreme crabs, best recognised by the possession of gonopores on the coxae of the pereopods, have variously been regarded as mono-, para- or polyphyletic, or even as non-brachyuran. For the first time, the phylogenetic positions of the podotreme crabs were studied by cladistic analysis of small subunit nuclear ribosomal RNA sequences. Eight of 10 podotreme families were represented along with representatives of 17 eubrachyuran families. Under both maximum parsimony and Bayesian Inference, Podotremata was found to be significantly paraphyletic, comprising three major clades: Dromiacea, Raninoida, and Cyclodorippoida. The most 'basal' is Dromiacea, followed by Raninoida and Cylodorippoida. Notably, Cyclodorippoida was identified as the sister group of the Eubrachyura. Previous hypotheses that the dromiid crab, Hypoconcha, is an anomuran were unsupported, though Dromiidae as presently composed could be paraphyletic. Topologies constrained for podotreme monophyly were found to be significantly worse (P < 0.04) than unconstrained topologies under Templeton and S-H tests. The clear pattern of podotreme paraphyly and robustness of topologies recovered indicates that Podotremata as a formal concept is untenable. Relationships among the eubrachyurans were generally equivocal, though results indicate the majoids or dorippoids were the least derived of the Eubrachyura. A new high level classification of the Brachyura is proposed.

  18. Male internal reproductive structures of European pea crabs (Crustacea, Decapoda, Brachyura, Pinnotheridae): vas deferens morphology and spermatozoal ultrastructure.

    Science.gov (United States)

    Becker, Carola; Klaus, Sebastian; Tudge, Christopher C

    2013-11-01

    Pea crabs of the subfamily Pinnotherinae (Pinnotheridae) have a high investment in reproduction and an outstanding reproductive output, probably as an adaptation to the required increase in reproductive rate due to the pinnotherids small size and their parasitic, host-dependant way of life. In the present study, we investigate the male internal reproductive structures and the ultrastructure of spermatozoa of Pinnotheres pisum and Nepinnotheres pinnotheres by histological methods and both scanning- and transmission electron microscopy. In the Brachyura, the male internal reproductive systems generally consist of paired testes and corresponding vasa deferentia where spermatozoa develop and mature. Spermatozoal ultrastructure of the investigated pinnotherids conforms to the thoracotreme type, however, N. pinnotheres has an accessory opercular ring and a periopercular rim, neither of which are present in spermatozoa of P. pisum. Spermatozoa are enclosed within spermatophores in the secretory proximal vas deferens. Two types of secretions were observed in P. pisum and N. pinnotheres: an electron dense substance secreted in the proximal vas deferens involved in spermatophore formation, and large electron-luscent vesicles constituting the seminal plasma in the medial and distal vas deferens. The medial vas deferens is strongly widened compared to other brachyurans to purpose storing spermatophores embedded in seminal plasma. Tubular appendices, which produce and store large amounts of seminal plasma, arise from the distal region of the vas deferens. The appendices extend into the ventral cephalothorax and also in the first pleomere. The latter being an exceptional location for reproductive structures among male brachyurans.

  19. New Report of Two Species of Crabs, Cycloes granulosa and Pugettia vulgaris (Crustacea: Decapoda Collected from Korea

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    Yang, Kea Cheong

    2015-07-01

    Full Text Available Two species of crabs, Cycloes granulosa and Pugettia vulgaris, are described and illustrated for the first time in Korea. The former is the first species of calappoid genus Cycloes and characterized by having a minute lateral spine on the margin of carapace. The latter is a species of majoid crab and similar to P. pellucens. However, it can be distinguished by shorter rostral spines, a smaller hepatic spine, and a carapace entirely covered with short setae. In Korea the calappoid crab now includes seven species of three genera (Calappa, Mursia, and Cycloes and the majoid genus Pugettia consists of six species.

  20. Functional morphology of the copulatory system of box crabs with long second gonopods (Calappidae, Eubrachyura, Decapoda, Crustacea).

    Science.gov (United States)

    Ewers-Saucedo, Christine; Hayer, Sarah; Brandis, Dirk

    2015-01-01

    Male True Crabs use two pairs of gonopods to deliver mating products during copulation. Commonly, the second pair is shorter than the first pair, and most research to date has focused on species with short second gonopods. We investigated male and female copulatory organs in Calappula saussurei and Calappa pelii, two species of box crabs (Calappidae) with second gonopods which are longer than the first pair. Scanning electron microscopy and histological cross sectioning show that the female copulatory system is unique in several aspects: the genital duct is part concave and part simple type. The seminal receptacle is divided into two chambers, a ventral chamber of ectodermal and mesodermal origin, and a dorsal chamber of ectodermal origin. This dorsal chamber is the location of spermatophore reception during copulation. A sperm plug closes the dorsal chamber off. We propose that long second gonopods deliver male mating products directly into the dorsal chamber. To date, spermatophore reception has been associated with the mesodermal tissue of the seminal receptacle. The copulatory system of box crabs with long second gonopods shows novel deviations from this general pattern.

  1. Ecological distribution and population structure of Acantholobulus schmitti (Rathbun, 1930 (Crustacea, Decapoda, Xanthoidea on the southeastern Brazilian coast

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    Vivian Fransozo

    2013-12-01

    Full Text Available This investigation analyzed the ecological distribution and population structure of A. schmitti on the southeastern coast of Brazil. Crabs were sampled monthly from January 1998 to December 1999 at the following bays: Ubatumirim (UBM, Ubatuba (UBA and Mar Virado (MV. Water and sediment samples were also collected from all sampling sites for an analysis of environmental factors. Acantholobus schmitti was most abundant at UBM (224, followed by UBA (154 and MV (23 but its abundance showed no association with the environmental factors analyzed. The low abundance of these crabs in MV may be due to the high wave action that moved biodetritic material accumulated on the bottom and frequently removed small crabs from their sheltered positions among the shell fragments. The individuals captured included 269 males and 132 females, of which only 4 specimens were brooding females. Juvenile recruitment occurred throughout the year, but was less intense in the spring. The major abundance of individuals as well as of ovigerous females occurred during 1999, when the entrance of the South Atlantic Central Waters (SACW was stronger than in previous year. This environmental influence could be the main factor modulating this population.

  2. On a collection of calappid crabs (Crustacea: Decapoda: Brachyura) from Fiji, with a description of a new species of Mursia.

    Science.gov (United States)

    Galil, Bella S

    2013-11-07

    Seven species of calappid crabs were identified from material collected during four IRD-MNHN expeditions conducted in 1998 and 1999 in shallow and deep waters off Fiji. Six species are reported for the first time from the islands. One new species, Mursia murimura n. sp., is described and illustrated. The new species differs from the closely related M. diwata Galil & Takeda, 2004, with which it shares a stout, distally auriculated first male pleopod, by possessing much longer lateral carapacial and cheliped spines.

  3. Two new species of freshwater crabs of the genus Sundathelphusa Bott, 1969 (Decapoda: Brachyura: Gecarcinucidae) from caves in Luzon, Philippines.

    Science.gov (United States)

    Husana, Daniel Edison M; Yamamuro, Masumi; Ng, Peter K L

    2014-06-17

    Two cave species of Sundathelphusa are described from a karst area in southern Luzon, Philippines. Both species have elongated ambulatory legs but the eyes and carapace pigmentation are well developed, indicating they are not troglobites. Sundathelphusa danae sp. nov. is superficially more similar to S. longipes (Balss, 1937) than to S. holthuisi Ng, 2010, which was described from the same locality. Sundathelphusa danae sp. nov. is distinguished from its closest congeners by its strongly convex anterolateral margin, more swollen branchial regions, possession of a complete frontal median triangle, laterally inflated subbranchial region and the more slender ambulatory legs. Sundathelphusa vienae sp. nov. is unusual among Sundathelphusa species in that its carapace is more quadrate, with the slender and almost straight male first gonopod tapered and having a pointed terminal segment. 

  4. Insular species of Afrotropical freshwater crabs (Crustacea: Decapoda: Brachyura: Potamonautidae and Potamidae) with special reference to Madagascar and the Seychelles

    NARCIS (Netherlands)

    Cumberlidge, N.

    2008-01-01

    The evolutionary relationships between island and mainland faunas of the 24 species of insular freshwater crabs in the Afrotropical region are reviewed in the light of phylogenetic studies. Twenty insular species of freshwater crabs are endemic, and four are also found on the neighboring mainland of

  5. Characterization and sequence analysis of manganese superoxide dismutases from Brachyura (Crustacea: Decapoda): hydrothermal Bythograeidae versus littoral crabs.

    Science.gov (United States)

    Marchand, J; Leignel, V; Moreau, B; Chénais, B

    2009-06-01

    Hydrothermal vent conditions are particular and organisms living in these environments may have developed detoxification mechanisms and/or genetic adaptations. In particular, physico-chemical conditions are thought to generate reactive oxygen species, highly toxic for organisms. The enzyme superoxide dismutase constitutes the first line of defense against oxidative damage. To improve our understanding of the environmental impacts exerted on the vent organisms, we have characterized the two manganese superoxide dismutase cDNAs (mitochondrial: mMnSOD and cytoplasmic: cMnSOD) of three members of the Bythograeidae (Bythograea thermydron, Cyanagraea praedator and Segonzacia mesatlantica), the only endemic crab family living in hydrothermal vents. In comparison, the isolation of manganese superoxide dismutase cDNAs was also carried out in several littoral crab families. MnSOD signatures were found in both sequences from each species studied, as well as different residues involved in metal coordination and protein activity. The phylogenetic analysis performed confirms the probable ancient duplication that gave rise to the two MnSODs (cMnSOD and mMnSOD). This study describes two potential distinct mMnSOD isoforms presenting particular peptide signals. Nevertheless, no sequence particularity that could support the hypothesis of a genetic adaptation was found in Bythograeidae's MnSODs compared to the other sequences. The mRNA expression analysis performed by real-time PCR on B. thermydron and S. mesatlantica compared to Cancer pagurus and Necora puber revealed a higher cMnSOD and mMnSOD mRNA expression in hydrothermal crabs compared to littoral crabs.

  6. Taxonomy of the freshwater crabs of Costa Rica, with a revision of the genus Ptychophallus Smalley, 1964 (Crustacea: Decapoda: Pseudothelphusidae).

    Science.gov (United States)

    Magalhães, Célio; Wehrtmann, Ingo S; Lara, Luis Rólier; Mantelatto, Fernando L

    2015-01-13

    The taxonomy and geographic distribution of the freshwater crabs of the family Pseudothelphusidae Ortmann, 1893, of Costa Rica, Central America, particularly of the genus Ptychophallus Smalley, 1964, are revised. Historical materials deposited in major collections of several institutions were examined, as well as valuable collections in the Zoological Museum of the University of Costa Rica that include abundant specimens obtained recently (2007-2010) in the southern region of the country. The pseudothelphusids of Costa Rica consists of 15 currently valid species belonging to Achlidon Smalley, 1964 (two species), Allacanthos Smalley, 1964 (two species), Potamocarcinus H. Milne Edwards, 1853 (three species), and Ptychophallus (eight species). Two species seem to be restricted to the Atlantic drainage, while seven are known only from the Pacific drainage; six species occur in both drainages. Ptychophallus comprises 13 valid species; four new synonymies are proposed: P. osaensis Rodríguez, 2001, P. campylus Pretzmann, 1968, P. tumimanus ingae            Pretzmann, 1978, and P. barbillaensis Rodríguez & Hedström, 2001, as junior synonyms of P. paraxantusi (Bott, 1968), P. tristani (Rathbum 1896), P. tumimanus (Rathbun, 1898), and P. uncinatus Campos & Lemaitre, 1999, respectively. Two species, P. colombianus (Rathbun, 1896) and P. exilipes (Rathbun, 1898), are considered species inquerendae. Lectotype designations are made for P. montanus and P. colombianus. Three species of Ptychophallus are known exclusively from Costa Rica, five exclusively from Panama, and five species occur in both countries; one species appears to be exclusive of the Atlantic drainage, whereas five are known only from the Pacific drainage and seven occur in both drainages. The gonopod morphology of all species is redescribed and illustrated, and maps of their geographic distribution are furnished. A key to the species of Pseudothelphusidae from Costa Rica and to all species of Ptychophallus is provided. 

  7. Out of the Sichuan Basin: Rapid species diversification of the freshwater crabs in Sinopotamon (Decapoda: Brachyura: Potamidae) endemic to China.

    Science.gov (United States)

    Ji, Yongkun; Sun, Yufang; Gao, Wei; Chu, Kelin; Wang, Ruicong; Zhao, Qiang; Sun, Hongying

    2016-07-01

    Sinopotamon Bott, 1967 is the most speciose and widely distributed freshwater crab genus in East Asia. Our extensive sampling includes about 76% of the known Sinopotamon taxa, and nearly covers its entire distribution area. Based on mitochondrial cytochrome oxidase I (COI) and 16S rRNA, as well as nuclear 28S rRNA and histone H3, we reconstructed the Sinopotamon phylogeny using maximum likelihood and Bayesian approaches. The divergence time was estimated and multiple methods were used to conduct diversification analyses. The ancestral geographic distribution and character state were reconstructed. Three main clades (Clades I, II and III) that roughly correspond to their main geographic distribution ranges were recovered. Our results challenge the current view of the four major species groups based on the morphological differences in the male first gonopod (G1). The most recent common ancestor of Sinopotamon most likely originated from the Sichuan Basin and surrounding mountains (SBSM) and subsequently dispersed throughout central and eastern China. The exceptionally rapid, recent diversification was detected in Clade II. The high incidence of species-level non-monophyly found in Clade II can be explained by recent rapid radiation. Climatic changes, morphological innovations, range expansion and geographical heterogeneity may all contribute to the diversification in Sinopotamon. This study contributes to our knowledge on diversification of freshwater benthic macro-invertebrates in the East Asian inland ecosystem.

  8. Reproductive cycle of the swimming crab Portunus spinimanus Latreille (Crustacea, Decapoda, Brachyura from Ubatuba, São Paulo, Brazil

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    Sandro Santos

    1999-01-01

    Full Text Available This study analyses some reproductive aspects of Portunus spinimanus Latreille, 1819, a crab usually commercialized in Ubatuba region. Monthly otter-trawl collections were taken for two years along the northern coast of São Paulo State, Brazil. The reproductive period was studied based on the frequency of ovigerous females in the population along the year; the frequency of physiologically mature swimming crabs and the type of spawn. The condition of development of ovigerous females ovary was associated with the stage of eggs development. This species presents continuous reproduction in Ubatuba region and total spawn, but with successive broods, which suggests a multiple spawn during the reproduction period.

  9. Impact of maintenance of Macrobrachium rosenbergii De Man, 1879 (Crustacea, Decapoda, Palaemonidae broodstock on the water used in culture ponds

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    JFV. Biudes

    Full Text Available Aquaculture production generates social and economic benefits, but can also cause environmental impacts. The objectives of this study were: a to characterise the impacts caused by the maintenance of broodstock of the giant river prawn (Macrobrachium rosenbergii on the physical and chemical characteristics of the water used in culture ponds, and b to evaluate the relationship between the biomass of the prawns and the impact of culture on the water used in the ponds. Between January and December 2004, we determined, monthly, the biomass of M. rosenbergii by means of biometrics, and the physical and chemical variables of the supply and effluent water from a pond used to maintain breeding stock. The results showed that the effluent water had higher contents of chlorophyll-a, suspended particulate matter (SPM, pH, dissolved oxygen, total Kjeldahl nitrogen (TKN and dissolved Kjeldahl nitrogen (DKN, inorganic nitrogen (IN, total (TP and dissolved phosphorus (DP, and P-orthophosphate than the supply water. The highest biomass of M. rosenbergii occurred in April (127.0 g.m-2 and the lowest in August (71.5 g.m-2, and there were positive linear correlations between the biomass of the prawns and the intensity of the increases in TKN, DKN, IN, TP, and DP of the water used in the pond. The maintenance of broodstock of M. rosenbergii increased the chlorophyll-a, SPM, nitrogen, and phosphorus contents of the water in the pond. Additionally, the increase in the biomass of the prawns intensifies the export of nitrogen and phosphorus from the pond in the effluent.

  10. A NEW SPECIES OF RANINOIDES (CRUSTACEA: DECAPODA:RANINIDAE) FROM OFF THE SOUTHEASTERN COAST OF HAINAN ISLAND AND NANSHA ISLANDS

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Raninoides longifions new species, off SE coast of Hainan Island, dorsal surface of carapace with an arched granular edge across carapace between the anterolateral teeth, median frontal tooth longest, second frontal teeth subquadrate.

  11. Overview on the European green crab Carcinus spp. (Portunidae, Decapoda), one of the most famous marine invaders and ecotoxicological models.

    Science.gov (United States)

    Leignel, V; Stillman, J H; Baringou, S; Thabet, R; Metais, I

    2014-01-01

    Green crabs (Carcinus, Portunidae) include two species native to Europe--Carcinus aestuarii (Mediterranean species) and Carcinus maenas (Atlantic species). These small shore crabs (maximal length carapace, approximately 10 cm) show rapid growth, high fecundity, and long planktonic larval stages that facilitate broad dispersion. Carcinus spp. have a high tolerance to fluctuations of environmental factors including oxygen, salinity, temperature, xenobiotic compounds, and others. Shipping of Carcinus spp. over the past centuries has resulted in its invasions of America, Asia, and Australia. Classified as one of the world's 100 worst invaders by the International Union for Conservation of Nature, Carcinus spp. are the most widely distributed intertidal crabs in the world. Their voracious predatory activity makes them strong interactors in local communities, and they are recognized as a model for invasiveness in marine systems as well as a sentinel species in ecotoxicology. This review shows an exhaustive analysis of the literature on the life cycle, diversity, physiological tolerance, genomic investigations, ecotoxicological use, historical invasion, control programs, and putative economical valorization of shore crabs.

  12. Salinity Tolerance and Oxygen Uptake in Initial Developmental Stages of Callinectes rathbunae Contreras and Callinectes sapidus Rathbun (Decapoda: Portunidae

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    A. Rocha-Ramirez

    2007-01-01

    Full Text Available Initial development stages of Callinectes rathbunae Contreras, 1930 and C. sapidus Rathbun, 1896 experience broad salinity gradients in estuarine landscapes that can affect survival and growth. Salinity tolerance of the megalopa stage and oxygen uptake of four early life stages of these species were estimated at salinity 5, 15, 25 and 35 psu treatments at 25C in the laboratory conditions showing similar salinity tolerances in the megalopa stage. Oxygen uptake rates were greater in low salinities with 9.649531.32278 mol O2 g-1 h-1 for C. rathbunae and 18.789060.55457 mol O2 g-1 h-1 for C. sapidus exposed to 5 psu and decreased in high salinities with 3.682500.37689 C. rathbunae and 8.209381.10001 mol O2 g-1 h-1 for C. sapidus to 35 psu in megalopae stage. Oxygen uptake decreased as they developed and metamorphosed over time. These data are comparable to field distribution and abundances observed in Alvarado Lagoon, Mexico and suggests that tolerance of low salinity (survival and growth is fueled by greater oxygen uptake rates.

  13. Fecundity, reproductive seasonality and maturation size of Callinectes sapidus females (Decapoda: Portunidae) in the Southeast coast of Brazil.

    Science.gov (United States)

    Severino-Rodrigues, Evandro; Musiello-Fernandes, Joelson; Moura, Alvaro A S; Branco, Geisa M P; Canéo, Victor O C

    2013-06-01

    C sapidus fisheries has a significant influence on the economy of some countries in North America and has a relative extensive literature in these regions. However, only few papers discuss the ecology of C. sapidus in the South Atlantic, despite its economic importance in that region. We studied the fecundity, reproductive seasonality and maturation size of C. sapidus females captured in the Southeast coast of Brazil from January to December 2002. Females were separated, weighted (Wt), and cephalothorax width (CW) was measured. Furthermore, the eggs-masses were classified according to embryonic development, separated, weighted (We) and fixed. Eggs were also separated and counted, resulting in the average number of eggs per individual (Ne). A total sample of 307 females was collected: 78 young, 130 adults and 99 ovigerous. Ovigerous females showed CW between 7.49 and 15.89cm with average of 12.21cm and were distributed throughout the sample period, with highest incidence between December and March. The onset of morphological maturity (L50) occurred at CW = 10.33 cm, and the size in which all were mature (L100) was CW = 11.20 cm. Individual fecundity ranged from 689 356 to 3 438 122 with an average of 2 006 974. The CW showed a positive growth trend with Ne and We. We concluded that in order to ensure the resource sustainability, it is necessary to prohibit captures of C. sapidus in these regions, especially during summer. Additionally, our studies suggest that the minimum capture size should be 11 cm of carapace width.

  14. Fecundity, reproductive seasonality and maturation size of Callinectes sapidus females (Decapoda: Portunidae in the Southeast coast of Brazil

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    Evandro Severino-Rodrigues

    2013-06-01

    Full Text Available C. sapidus fisheries has a significant influence on the economy of some countries in North America and has a relative extensive literature in these regions. However, only few papers discuss the ecology of C. sapidus in the South Atlantic, despite its economic importance in that region. We studied the fecundity, reproductive seasonality and maturation size of C. sapidus females captured in the Southeast coast of Brazil from January to December 2002. Females were separated, weighted (Wt, and cephalothorax width (CW was measured. Furthermore, the eggs-masses were classified according to embryonic development, separated, weighted (We and fixed. Eggs were also separated and counted, resulting in the average number of eggs per individual (Ne. A total sample of 307 females was collected: 78 young, 130 adults and 99 ovigerous. Ovigerous females showed CW between 7.49 and 15.89cm with average of 12.21cm and were distributed throughout the sample period, with highest incidence between December and March. The onset of morphological maturity (L50 occurred at CW=10.33cm, and the size in which all were mature (L100 was CW=11.20cm. Individual fecundity ranged from 689 356 to 3 438 122 with an average of 2 006 974. The CW showed a positive growth trend with Ne and We. We concluded that in order to ensure the resource sustainability, it is necessary to prohibit captures of C. sapidus in these regions, especially during summer. Additionally, our studies suggest that the minimum capture size should be 11cm of carapace width.

  15. Fecundity, reproductive seasonality and maturation size of Callinectes sapidus females (Decapoda: Portunidae in the Southeast coast of Brazil

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    Evandro Severino-Rodrigues

    2013-06-01

    Full Text Available C. sapidus fisheries has a significant influence on the economy of some countries in North America and has a relative extensive literature in these regions. However, only few papers discuss the ecology of C. sapidus in the South Atlantic, despite its economic importance in that region. We studied the fecundity, reproductive seasonality and maturation size of C. sapidus females captured in the Southeast coast of Brazil from January to December 2002. Females were separated, weighted (Wt, and cephalothorax width (CW was measured. Furthermore, the eggs-masses were classified according to embryonic development, separated, weighted (We and fixed. Eggs were also separated and counted, resulting in the average number of eggs per individual (Ne. A total sample of 307 females was collected: 78 young, 130 adults and 99 ovigerous. Ovigerous females showed CW between 7.49 and 15.89cm with average of 12.21cm and were distributed throughout the sample period, with highest incidence between December and March. The onset of morphological maturity (L50 occurred at CW=10.33cm, and the size in which all were mature (L100 was CW=11.20cm. Individual fecundity ranged from 689 356 to 3 438 122 with an average of 2 006 974. The CW showed a positive growth trend with Ne and We. We concluded that in order to ensure the resource sustainability, it is necessary to prohibit captures of C. sapidus in these regions, especially during summer. Additionally, our studies suggest that the minimum capture size should be 11cm of carapace width.Hay pocos estudios sobre la ecología de C. sapidus en el Atlántico Sur, a pesar de su importancia económica en la región. El presente estudio tiene como objetivo conocer la fecundidad, periodo reproductivo y talla de primera madurez morfológica de las hembras de C. sapidus, con el fin de contribuir a una mejor comprensión de la especie en el Atlántico occidental, así como ayudar en la toma de medidas de gestión en la región. Las muestras fueron recolectadas mensualmente de enero a diciembre 2002 en sudeste del Brazil. Se recogieron 307 hembras: 78 jóvenes, 130 adultos y 99 ovígeras. Las hembras ovígeras mostró su intervalo de talla de 7.49-15.89cm ancho del carapazón (AC y se distribuyeron en todo el período de la muestra, con mayor incidencia entre diciembre y marzo. El inicio de la madurez morfológica (L50 fue con la AC=10.33cm y el tamaño que tenían todos los maduros (L100 con AC de 11.20cm. Fecundidad individual osciló entre 689 356 a 3 438 122, con una media 2 006 974. El AC mostró una tendencia positiva en el crecimiento con número de huevos y el peso del huevos. El conocimiento de los aspectos reproductivos de la población es importante en la definición de medidas de gestión para el uso sostenible con el fin de renovar y continuar con la misma.

  16. Towards a Supertree of Arthropoda: A Species-Level Supertree of the Spiny, Slipper and Coral Lobsters (Decapoda: Achelata.

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    Katie E Davis

    Full Text Available While supertrees have been built for many vertebrate groups (notably birds, mammals and dinosaurs, invertebrates have attracted relatively little attention. The paucity of supertrees of arthropods is particularly surprising given their economic and ecological importance, as well as their overwhelming contribution to biodiversity. The absence of comprehensive archives of machine-readable source trees, coupled with the need for software implementing repeatable protocols for managing them, has undoubtedly impeded progress. Here we present a supertree of Achelata (spiny, slipper and coral lobsters as a proof of concept, constructed using new supertree specific software (the Supertree Toolkit; STK and following a published protocol. We also introduce a new resource for archiving and managing published source trees. Our supertree of Achelata is synthesised from morphological and molecular source trees, and represents the most complete species-level tree of the group to date. Our findings are consistent with recent taxonomic treatments, confirming the validity of just two families: Palinuridae and Scyllaridae; Synaxidae were resolved within Palinuridae. Monophyletic Silentes and Stridentes lineages are recovered within Palinuridae, and all sub-families within Scyllaridae are found to be monophyletic with the exception of Ibacinae. We demonstrate the feasibility of building larger supertrees of arthropods, with the ultimate objective of building a complete species-level phylogeny for the entire phylum using a divide and conquer strategy.

  17. Use of multiple chemical tracers to define habitat use of Indo-Pacific mangrove crab, Scylla serrata (Decapoda: Portunidae)

    Science.gov (United States)

    Demopoulos, A.W.J.; Cormier, N.; Ewel, K.C.; Fry, B.

    2008-01-01

    The mangrove or mud crab, Scylla serrata, is an important component of mangrove fisheries throughout the Indo-Pacific. Understanding crab diets and habitat use should assist in managing these fisheries and could provide additional justification for conservation of the mangrove ecosystem itself. We used multiple chemical tracers to test whether crab movements were restricted to local mangrove forests, or extended to include adjacent seagrass beds and reef flats. We sampled three mangrove forests on the island of Kosrae in the Federated States of Micronesia at Lelu Harbor, Okat River, and Utwe tidal channel. Samples of S. serrata and likely food sources were analyzed for stable carbon (??13C), nitrogen (??15N), and sulfur (??34S) isotopes. Scylla serrata tissues also were analyzed for phosphorus (P), cations (K, Ca, Mg, Na), and trace elements (Mn, Fe, Cu, Zn, and B). Discriminant analysis indicated that at least 87% of the crabs remain in each site as distinct populations. Crab stable isotope values indicated potential differences in habitat use within estuaries. Values for ??13C and ??34S in crabs from Okat and Utwe were low and similar to values expected from animals feeding within mangrove forests, e.g., feeding on infauna that had average ??13C values near -26.5???. In contrast, crabs from Lelu had higher ?? 13C and ??34S values, with average values of -21.8 and 7.8???, respectively. These higher isotope values are consistent with increased crab foraging on reef flats and seagrasses. Given that S. serrata have been observed feeding on adjacent reef and seagrass environments on Kosrae, it is likely that they move in and out of the mangroves for feeding. Isotope mixing model results support these conclusions, with the greatest mangrove ecosystem contribution to S. serrata diet occurring in the largest mangrove forests. Conserving larger island mangrove forests (> 1 km deep) appears to support crab foraging activities. ?? 2007 Coastal and Estuarine Research Federation.

  18. The effect of astaxanthin on resistance of juvenile prawns Macrobrachium nipponense (Decapoda: Palaemonidae) to physical and chemical stress.

    Science.gov (United States)

    Tizkar, Babak; Seidavi, Alireza; Ponce-Palafox, Jesús Trinidad; Pourashoori, Parastoo

    2014-12-01

    In recent years, the use of new scientific techniques has effectively improved aquaculture production processes. Astaxanthin has various properties in aquaculture and its antioxidant benefits have been closely related to stress resistance; besides, it is an essential factor for growth in many crustaceans and fish. The objective of this study was to evaluate the resistance of prawn (Macrobrachium nipponense) fed diets containing different amounts of astaxanthin (AX) to the shock and stress of different physicochemical environments. A 70-day trial was conducted to evaluate the effect of supplementation of a source of astaxanthin (Carophyll Pink, 10% astaxanthin, w/w, Hoffman-La Roche, Switzerland) at various levels in the diet of M. nipponense juveniles. Four dry diets were prepared: AX0 without astaxanthin, AX50 with 50 mg/kg, AX100 with 100 mg/kg, and AX150 with 150 mg/kg astaxanthin. The feeding trial was conducted in a recirculation water system consisting of 12 fiberglass tanks (1000L) used for holding prawns. Three replicate aquaria were initially stocked with 36 org/m2 per tank. During the trial, prawns were maintained on a 12:12-h light:dark photoperiod with an ordinary incandescent lamp, and the water quality parameters were maintained as follows: water temperature, 25-26°C; salinity, 1 g/L; pH, 8.5-8.8; dissolved oxygen, 6.0-6.5 mg/L; and ammonia-nitrogen, 0.05 mg/L. Incorporation of AX, production output, and physiological condition were recorded after 10 weeks of feeding. At the end of the growing period, the prawns were exposed to thermal shock (0°C), ammonia (0.75 mg/L), and reduced oxygen (0.5 mg/L). The time to lethargy and the time to complete death of the prawns were recorded. The results showed that control prawns had the shortest time to lethargy and death compared with prawns subjected to the other treatments. The results of this study have shown that the amount of muscle tissue and gill carotenoids in prawn fed with an AX150 diet showed greater reduction than those exposed to other treatments. It is possible that higher levels of astaxanthin in the body under oxygen reduction stress can be beneficial for prawns. These results suggest that male prawns showed lethargy earlier than females, and the percentage of carotenoid reduction in muscle and gill tissues was higher in males.

  19. Embryo production in the sponge-dwelling snapping shrimp Synalpheus apioceros (Decapoda, Alpheidae from Bocas del Toro, Panama

    Directory of Open Access Journals (Sweden)

    Adriana Rebolledo

    2014-11-01

    Full Text Available Caridean shrimps of the genus Synalpheus are abundant and widely distributed in tropical and subtropical regions, but knowledge of their reproductive biology remains scarce. We report reproductive traits of Synalpheus apioceros from Bocas del Toro, Panama, based on collections in August 2011. The 46 ovigerous females that were analyzed ranged in size from 3.8 to 7.4 mm in carapace length. Fecundity varied between 8 and 310 embryos and increased with female size. Females invested 18.6 ± 10.3% of their body weight in Embryo production. Embryo volume increased considerably (77.2% during embryogenesis, likely representing water uptake near the end of incubation period. Compared to Synalpheus species with abbreviated or direct development, S. apioceros produced substantially smaller embryos; however, S. apioceros seems to have a prolonged larval phase with at least five zoeal stages, which may explain the combination of relatively small and numerous embryos. We did not find nonviable, minute, chalky embryos, previously reported for S. apioceros specimens obtained from the northwestern Gulf of Mexico, which supports the hypothesis that the production of this type of embryos may be a physiological response of this warm-water species to the temperature decrease near to its latitudinal range limit.

  20. New records of caridean shrimps (Decapoda: Caridea from shallow water along the northern Yucatan peninsula coasts of México

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    Luis Daniel Santana-Moreno

    Full Text Available The northern coast of the Mexican state of Yucatán has only been cursorily sampled in the past, with most of this effort concentrated on the largest coral reef in the Gulf of México, Arrecife Alacranes. The present study reports on recent collections (June 2008 - September 2013 of caridean shrimp in Yucatán, including Arrecife Alacranes and other reefs, as well as coastal lagoons and beaches. Additionally, a number of species are reported based on older, unidentified museum material. Six species represent new records for the Gulf of México [Janicea antiguensis (Chace, 1972, Gnathophyllum modestum Hay, 1917, Lysmata jundalini Rhyne, Calado and dos Santos, 2012, Periclimenes sandyi De Grave, 2009, Rapipontonia platalea (Holthuis, 1951a, Typton tortugae, McClendon, 1911], and 11 species are confirmed new records for México [Lysmata ankeri Rhyne and Lin, 2006, L. pederseni Rhyne and Lin, 2006, L. rafa Rhyne and Anker, 2007, Ascidonia miserabilis (Holthuis, 1951b, A. quasipusilla (Chace, 1972, Neopontonides chacei Heard, 1986, Periclimenaeus maxillulidens (Schmitt, 1936, P. pearsei (Schmitt, 1932, P. schmitti Holthuis, 1951b, Typton prionurus Holthuis, 1951b, Processa manningi De Grave and Felder, 2012], adding up to a total of 17 newly reported species for the East coast of México. Further, the colour pattern of several species is documented for the first time.

  1. Local knowledge of traditional fishermen on economically important crabs (Decapoda: Brachyura in the city of Conde, Bahia State, Northeastern Brazil

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    de Magalhães Henrique

    2012-07-01

    Full Text Available Abstract Background This article records the traditional knowledge of crab gatherers in the city of Conde, in the North Coast Region of Bahia State, Northeastern Brazil. Methods Data on biological and ecological aspects of economically important brachyuran crustaceans have been obtained from semi-structured interviews and in loco observations conducted from September 2007 to December 2009. A total of 57 fishermen of both genders, aged between 10 and 78 years have been interviewed (individually or collectively in different contexts; interviewees were asked about aspects such as external morphology, life cycle, trophic ecology, and spatial and temporal distribution of the major economically important brachyuran crustaceans in the region. Seven fishing communities were visited: Siribinha, Sítio do Conde, Poças, Ilha das Ostras, Cobó, Buri and Sempre Viva. Data were analyzed by comparing the information provided by participants with those from the specialized academic literature. Results The results show that artisanal fishermen have a wide ranging and well-grounded knowledge on the ecological and biological aspects of crustaceans. Crab gatherers of Conde know about growth and reproductive behavior of the animals they interact with, especially with regard to the three major biological aspects: “molt”, “walking dance” and “spawning”. Conclusion This knowledge constitutes an important source of information that should be considered in studies of management and sustainable use of fishery resources in the North Coast Region of Bahia State.

  2. The First Zoeal Stages of Parapanope euagora and Halimede fragifer (Decapoda: Pilumnoidea: Galenidae Hatched in the Laboratory

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    Lee, Seok Hyun

    2016-04-01

    Full Text Available The first zoeas of Parapanope euagora and Halimede fragifer hatched in the laboratory from two ovigerous galenid crabs of Pilumnoidea were collected from Jindo Island, Jeolanam-do, southern Korea. Their morphologies are described in P. euagora for the first time in the world and re-described in H. fragifer with the color images of live zoeas. In this study, they show a general morphology of Pilumnoidea by having a long antennal exopod, an endopod of the maxillule with 1, 2+4 setae, an endopod of the maxilla with 3+5 setae, and a fork of the telson with two lateral armatures. However, the first zoea of P. euagora differs from other known zoeas of pilumnoid species including H. fragifer by having a long antennal exopod with a medial seta and spine, not two spines, and a fork of telson with two lateral setae, not a seta and spine. Such characteristics of the antennal exopod and the fork of telson are reported for the first time in the pilumnoid zoeas. A comparison between the first zoeal stage of H. fragifer in this study and that of Terada shows minute differences in the characteristics of the antennule and the fork of telson.

  3. Acute and chronic effects of parathion and 2,4 D on the oxygen consumption of Chasmagnathus granulata (Decapoda, Brachyura).

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    Rodríguez, E M; Monserrat, J M

    1991-01-01

    The effect of two pesticides widely used in Argentina on the oxygen consumption of the estuarine crab Chasmagnathus granulata was studied. Constant pressure respirometers were employed to estimate the rate of oxygen consumption per weight unit of animals treated previously with each pesticide, both acute (96 h) and chronically (15 and 30 days). Crabs exposed to parathion -an organophosphorate insecticide that causes the inhibition of acetylcholinesterase- show an increase of oxygen consumption at 0.5 ppm under acute exposure, and at 10 ppb under a chronic one. On the other hand, crabs exposed to 2,4 D (an herbicide) did not show changes in their consumption after an acute exposure, but those exposed chronically did show an increase at low concentration (5 ppm) followed by a relative decrease at the highest concentration (50 ppm). The results obtained for parathion are in accordance with the abnormal cholinergic excitation that it may exert on crustacean nervous system. The effect of 2,4 D was consistent with its uncoupler action at respiratory chain level, at low concentrations, while a possible Krebs cycle enzymes inhibition might be occurring at higher concentrations of that pesticide, as in other crustacean species. The faster action of parathion, respect to 2,4 D, is explained by its neurotoxic nature.

  4. Width-weight relationship and condition factor of Ucides cordatus (Crustacea, Decapoda, Ucididae at tropical mangroves of Northeast Brazil

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    Marina S.L.C. Araújo

    2012-09-01

    Full Text Available The present contribution aims at evaluating the carapace width vs. humid weight relationship and the condition factor of Ucides cordatus (Linnaeus, 1763, in the mangrove forests of the Ariquindá and Mamucabas rivers, state of Pernambuco, Brazil. These two close areas present similar characteristics of vegetation and substrate, but exhibit different degrees of environmental conservation: the Ariquindá River is the preserved area, considered one of the last non-polluted of Pernambuco, while the Mamucabas River suffers impacts from damming, deforestation and deposition of waste. A total of 1,298 individuals of U. cordatus were collected. Males were larger and heavier than females, what is commonly observed in Brachyura. Ucides cordatus showed allometric negative growth (p < 0.05, which is probably related to the dilatation that this species develops in the lateral of the carapace, which stores six pairs of gills. The values of b were within the limit established for aquatic organisms. Despite of the condition factor being considered an important feature to confirm the reproductive period, since it varies with cyclic activities, in the present study it was not correlated to the abundance of ovigerous females. However, it was considered a good parameter to evaluate environmental impacts, being significantly lower at the impacted area.

  5. Trophic ecology of the freshwater prawn, Pseudopalaemon bouvieri (Decapoda: Palaemonidae in Northeastern Argentina: with remarks on population structure

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    Romina Patricia Carnevali

    2012-03-01

    Full Text Available Freshwater decapod crustaceans are important components of food webs in these environments, but little is known about the diet of species that live in tropical waters. We studied the feeding ecology of the prawn Pseudopalaemon bouvieri and its population structure in two different areas with six lagoons, with a different composition and abundance of aquatic macrophytes. At each site of macrophytes banks, 18 prawns sample was collected with a hand net (1mm mesh size from 1m². In the laboratory, prawns cephalothorax length was measured, sex determined, and a total of 208 stomachs were examined for food items. Our results showed that the population abundance varied between 10 ind/m² and 1 411 ind/m². The cephalothorax length ranged between 6mm and 21mm, and the male:female ratio varied between 0.3 and 1.0, with a higher proportion of ovigerous females (21% in area one than area two. P. bouvieri is omnivorous, and its diet was principally based on algae, plant remains, Protozoa, Rotifera, Oligochaeta, Crustacea, Insecta, detritus and other items. The analysis of the stomach content did not reveal any significant difference in the diet between juveniles and adults, and males and females of both areas consumed a similar diet (Kruskal-Wallis test p=0.8273. We concluded that the dietary items consumed by prawns and the niche breadth were similar between the two areas, although the proportion of items consumed varied between lagoons of both areas. The density of P. bouvieri was different between areas, but the size of cephalothorax (CL was similar.Los crustáceos decápodos de agua dulce son un componente importante de la cadena trófica, pero poco se sabe sobre la dieta de las especies que viven en aguas tropicales. Nosotros estudiamos la ecología alimentaria del camarón Pseudopalaemon bouvieri y la estructura de su población en dos áreas diferentes con seis lagunas, con una diferente composición y abundancia de macrófitas acuáticas. En cada sitio poblado con macrófitas, se tomaron 18 muestras con una red manual (1mm de tamaño de malla de 1m². En laboratorio, se midió la longitud de cefalotórax de los camarones y se determinó el sexo. Asimismo, fueron examinados un total de 208 estómagos para determinar su alimentación. Nuestros resultados mostraron que la abundancia de la población varió entre 10 ind/m² y 1 411 ind/ m². La longitud de cefalotórax osciló entre 6 y 21mm, y la razón macho:hembra varió entre 0.3 y 1.0, con una mayor proporción de hembras ovígeras (21% en el área 1 que en el área 2. P. bouvieri es omnívoro y su alimentación se basa principalmente en algas, restos de plantas, protozoos, rotíferos, Oligochaeta, crustáceos, Insecta, detrito y otros ítems. El análisis del contenido estomacal no reveló ninguna diferencia significativa en la dieta entre juveniles y adultos, y los machos y hembras de ambas áreas consumieron una dieta similar (Kruskal-Wallis, p=0.8273. Nosotros concluimos que los ítems alimentarios consumidos por los camarones y la amplitud de nicho fueron similares entre las dos áreas, aunque la proporción de ítems consumidos varió entre lagunas de ambas áreas. La densidad de P. bouvieri fue diferente entre áreas, pero el tamaño del cefalotórax (CL fue similar.

  6. Two new species of shrimp of the Indo-West Pacific genus Hamodactylus Holthuis, 1952 (Crustacea: Decapoda: Palaemonidae

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    Ivona HORKÁ

    2016-04-01

    Full Text Available Two new alcyonacean-associated species, Hamodactylus paraqabai sp. nov. from Papua New Guinea and the Great Barrier Reef and H. pseudaqabai sp. nov. from Indonesia and Malaysia, are described and illustrated. To evaluate the status of the new species and their relationship within the genus Hamodactylus Holthuis, 1952, we combined morphology and phylogenetic analyses based on the cytochrome c oxidase subunit I (COI mitochondrial gene. Both new species are closely related, with their mutual genetic divergence reaching 3-4%. They are further most related to Hamodactylus aqabai Bruce & Svoboda, 1983, originally described from the Red Sea. Both new species are distinguished from all other congeners by the presence of multiple teeth distally on the cutting edges of the fingers of the first pereiopods, and, in the case of H. paraqabai sp. nov., by a full reduction of the fixed finger on the second pereiopod chela. In H. pseudaqabai sp. nov. the finger is greatly reduced to a small but distinct stub, and the telson bears only a single pair of dorsal spines, as in H. aqabai. A key for the identification of all six currently known species is proposed.

  7. On the morphology of the central nervous system in larval stages of Carcinus maenas L. (Decapoda, Brachyura)

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    Harzsch, S.; Dawirs, R. R.

    1993-02-01

    We investigated the morphology of the central nervous system throughout the larval development of Carcinus maenas. For that purpose single larvae were reared in the laboratory from hatching through metamorphosis. Complete series of whole mout semithin sections were obtained from individuals of all successive larval stages and analysed with a light microscope. Morphological feature and spatial arrangement of discernable neural cell clusters, fibre tracts and neuropile are described and compared with the adult pattern. We found that most of the morphological features characterizing the adult nervous system are already present in the zoea-1. Nevertheless, there are marked differences with respect to the arrangement of nerve cell bodies, organization of cerebral neuropile, and disposition of ganglia in the ventral nerve cord. It appears that complexity of the central nervous neuropile is selectively altered during postmetamorphotic development, probably reflecting adaptive changes of sensory-motor integration in response to behavioural maturation. In contrast, during larval development there was little change in the overall structural organization of the central nervous system despite some considerable growth. However, the transition from zoea-4 to megalopa brings about multiple fundamental changes in larval morphology and behavioural pattern. Since central nervous integration should properly adapt to the altered behavioural repertoire of the megalopa, it seems necessary to ask in which respect synaptic rearrangement might characterize development of the central nervous system.

  8. Identification, Characterization, and Diel Pattern of Expression of Canonical Clock Genes in Nephrops norvegicus (Crustacea: Decapoda Eyestalk.

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    Valerio Sbragaglia

    Full Text Available The Norway lobster, Nephrops norvegicus, is a burrowing decapod with a rhythmic burrow emergence (24 h governed by the circadian system. It is an important resource for European fisheries and its behavior deeply affects its availability. The current knowledge of Nephrops circadian biology is phenomenological as it is currently the case for almost all crustaceans. In attempt to elucidate the putative molecular mechanisms underlying circadian gene regulation in Nephrops, we used a transcriptomics approach on cDNA extracted from the eyestalk, a structure playing a crucial role in controlling behavior of decapods. We studied 14 male lobsters under 12-12 light-darkness blue light cycle. We used the Hiseq 2000 Illumina platform to sequence two eyestalk libraries (under light and darkness conditions obtaining about 90 millions 100-bp paired-end reads. Trinity was used for the de novo reconstruction of transcriptomes; the size at which half of all assembled bases reside in contigs (N50 was equal to 1796 (light and 2055 (darkness. We found a list of candidate clock genes and focused our attention on canonical ones: timeless, period, clock and bmal1. The cloning of assembled fragments validated Trinity outputs. The putative Nephrops clock genes showed high levels of identity (blastx on NCBI with known crustacean clock gene homologs such as Eurydice pulchra (period: 47%, timeless: 59%, bmal1: 79% and Macrobrachium rosenbergii (clock: 100%. We also found a vertebrate-like cryptochrome 2. RT-qPCR showed that only timeless had a robust diel pattern of expression. Our data are in accordance with the current knowledge of the crustacean circadian clock, reinforcing the idea that the molecular clockwork of this group shows some differences with the established model in Drosophila melanogaster.

  9. Growth patterns, chemical composition and oxygen consumption in early juvenile Hyas araneus (Decapoda: Majidae) reared in the laboratory

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    Anger, K.; Harms, J.; Christiansen, M. E.; Süsens, U.; Wilmes, B.

    1992-03-01

    Early (instar I and II) juveniles of the spider crab Hyas araneus were reared under constant conditions (12 °C, 32‰S) in the laboratory, and their growth, biochemical composition, and respiration were studied. Every second day, dry weight (W), ash-free dry weight (AFW), and contents of ash, organic and inorganic carbon (C), nitrogen (N), hydrogen (H), protein, chitin, lipid, and carbohydrates were measured, as well as oxygen consumption. Changes in the absolute amounts of W. AFW, and C, N, and H during the moulting cycle are described with various regression equations as functions of age within a given instar. These patterns of growth differ in part from those that have been observed during previous studies in larval stages of the same and some other decapod species, possibly indicating different growth strategies in larvae and juveniles. There were clear periodic changes in ash (% of W) and inorganic C (as % of total C), with initially very low and then steeply increasing values in postmoult, a maximum in intermoult, and decreasing figures during the premoult phase of each moulting cycle. Similar patterns were observed in the chitin fraction, reaching a maximum of 16% of W (31% of AFW). Ash, inorganic C, and chitin represent the major components of the exoskeleton and hence, changes in their amounts are associated with the formation and loss of cuticle material. Consequently, a high percentage of mineral matter was lost with the exuvia (76% of the late premoult [LPM] ash content, 74% of inorganic C), but relatively small fractions of LPM organic matter (15% of AFW, 11% of organic C, 5 6% of N and H). These cyclic changes in the cuticle caused an inverse pattern of variation in the percentage values (% of W) of AFW, organic C, N, H, and biochemical constituents other than chitin. When these measures of living biomass were related to, exclusively, the organic body fraction (AFM), much less variation was found during individual moulting cycles, with values of about 43 52% in organic C, 9 10% in N, 6 9% H, 31 49% of AFW in protein, 3 10% in lipid, and <1% in carbohydrates. All these constituents showed, on the average, a decreasing tendency during the first two crab instars, whereas N remained fairly constant. It cannot be explained at present, what other elements and biochemical compounds, respectively, might replace these decreasing components of AFW. Decreasing tendencies during juvenile growth were observed also in the organic C/N and in the lipid/protein weight ratios, both indicating that the proportion of lipid decreased at a higher rate than that of protein. Changes were observed also in the composition of inorganic matter, with significantly lower inorganic C in early postmoult (2 4% of ash) than in later stages of the moult cycle (about 9%). This reflected probably an increase in the degree of calcification, i.e. in the calcium carbonate content of the exoskeleton. As a fraction of total C, inorganic C reached maximum values of 17 and 20% in the crab I and II instars, respectively. The energy content of juvenile spider crabs was estimated independently from organic C and biochemical constituents, with a significant correlation between these values. However, the former estimates of energy were, on the average, significantly lower than the latter (slope of the regression ≠1). Since organic C should be a reliable integrator of organic substances, but the sum of protein, lipid, chitin, and carbohydrates amounted to only 60 91% of AFW, it is concluded that the observed discrepancy between these two estimates of energy was caused by energy from biochemical constituents that had not been determined in our analyses. Thus, energy values obtained from these biochemical fractions alone may underestimate the actual amount of organic matter and energy. Respiration per individual in juvenile spider crabs was higher than that in larval stages of the same species (previous studies), but their W-specific values of oxygen consumption (QO2) were lower than in conspecific larvae (0.6 2μg O2·[mg W]-1). QO2 showed a consistent periodic pattern in relation to the moult cycle: maximum values in early postmoult, followed by a rapid decrease, and constant values in the intermoult and premoult phases. This variation is interpreted as an effect mainly of cyclic changes in the amounts of cuticle materials which are metabolically inactive. From growth and respiration values (both expressed in units of organic C), net growth efficiency, K2, values may be calculated. In contrast to previous findings in larval stages, K2 showed an increasing trend during growth of the first two juvenile instars of H. araneus.

  10. Three new species of freshwater crabs of the genus Pseudothelphusa (De Saussure, 1857) (Crustacea: Decapoda: Pseudothelphusidae) from Mexico.

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    Ojeda-Escoto, Juan Carlos; Villalobos, José Luis; Álvarez, Fernando

    2017-01-11

    Three new species of freshwater crabs of the genus Pseudothelphusa (De Saussure, 1857) from south-central Mexico are described: Pseudothelphusa acahuizotla n. sp., P. ixtapan n. sp., and P. purhepecha n. sp. The new species are included in Pseudothelphusa due to a male gonopod with torsion and the presence of the characteristic mesial process and caudomarginal projection. Pseudothelphusa acahuizotla n. sp. is morphologically similar to P. belliana Rathbun, 1898, but can be distinguished by the relative size of the distal lobe of the caudomarginal projection and by the presence of a conical tooth on the caudal surface of the mesial process of the male gonopod. Pseudothelphusa ixtapan n. sp. is similar to P. dilatata Rathbun, 1898, and P. morelosis Pretzmann, 1968, and can be distinguished by a mesial process of the male gonopod with only one lateral tooth and an inferior margin with small teeth. Pseudothelphusa puerhepechae n. sp. exhibits a mesial process of the male gonopod with two triangular spines on its lateral margin, a character that with some variations is present in P. nayaritae Álvarez & Villalobos, 1994, P. rechingeri Pretzmann, 1965, P. lophophallus Rodríguez & Smalley, 1969, and P. parabelliana Álvarez 1989; but it can be distinguished by the separation and shape of the two spines of the mesial process and the shape of the lobes of the caudomarginal projection. With the new species described herein there are now 29 species in the genus Pseudothelphusa.

  11. Towards a Supertree of Arthropoda: A Species-Level Supertree of the Spiny, Slipper and Coral Lobsters (Decapoda: Achelata).

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    Davis, Katie E; Hesketh, Thomas W; Delmer, Cyrille; Wills, Matthew A

    2015-01-01

    While supertrees have been built for many vertebrate groups (notably birds, mammals and dinosaurs), invertebrates have attracted relatively little attention. The paucity of supertrees of arthropods is particularly surprising given their economic and ecological importance, as well as their overwhelming contribution to biodiversity. The absence of comprehensive archives of machine-readable source trees, coupled with the need for software implementing repeatable protocols for managing them, has undoubtedly impeded progress. Here we present a supertree of Achelata (spiny, slipper and coral lobsters) as a proof of concept, constructed using new supertree specific software (the Supertree Toolkit; STK) and following a published protocol. We also introduce a new resource for archiving and managing published source trees. Our supertree of Achelata is synthesised from morphological and molecular source trees, and represents the most complete species-level tree of the group to date. Our findings are consistent with recent taxonomic treatments, confirming the validity of just two families: Palinuridae and Scyllaridae; Synaxidae were resolved within Palinuridae. Monophyletic Silentes and Stridentes lineages are recovered within Palinuridae, and all sub-families within Scyllaridae are found to be monophyletic with the exception of Ibacinae. We demonstrate the feasibility of building larger supertrees of arthropods, with the ultimate objective of building a complete species-level phylogeny for the entire phylum using a divide and conquer strategy.

  12. Distribución espacial de Ocypode quadrata (Decapoda: Ocypodidae en ocho playas de la zona norte oriental de Cuba

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    Frank A. Ocaña

    2012-09-01

    Full Text Available Uno de los organismos más comunes en las playas arenosas son los miembros del género Ocypode conocidos como cangrejos fantasmas, están ampliamente distribuidos en las regiones tropicales y subtropicales; además tienen un importante papel en la transferencia de energía en diferentes niveles tróficos. El objetivo del presente trabajo es dar a conocer aspectos relacionados con la variación espacial de la densidad de O. quadrata en playas con diferente nivel de influencia humana en la costa norte oriental de Cuba. En mayo de 2010, fueron contadas un total de 355 galerías en 360 unidades de muestreo. La composición por clases de tallas fue de 237 galerías de jóvenes y 118 de adultos. Del total de galerías contadas el 74% ocuparon el nivel P1, 20% el nivel P2 y 6% el nivel P3. La densidad varió entre 0.06-0.52galerías/m2. A pesar del nivel de influencia humana, la mayoría de las playas no mostró diferencias significativas en la densidad de galerías (Scheffé, p>0.05. La densidad de individuos en la zona superior de resaca del oleaje es mayor (Scheffé, p<0.05, predominando los jóvenes y en el resto de los estratos la densidad total va disminuyendo y predominan los individuos adultos. El patrón de variación entre los estratos no fue el mismo para todas las playas. En el presente estudio no se encontró evidencia directa entre el nivel de turismo y la densidad de galerías del cangrejo fantasma

  13. Embryonic development of four species of palaemonid prawns (Crustacea, Decapoda: pre-naupliar, naupliar and post-naupliar periods

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    Yara Müller

    2004-03-01

    Full Text Available The embryonic development of four species of the family Palaemonidae was studied under laboratory conditions. Adults of Macrobrachium olfersi (Wiegman, 1836, Macrobrachium potiuna (Müller, 1880, Palaemon pandaliformis (Stimpson, 1871 and Palaemonetes argentinus (Nobili, 1901 were collected in Santa Catarina Island, Santa Catarina, Brazil and maintained at 26ºC. The following embryonic characters were analyzed: egg shape, yolk organization and cleavage plane, naupliar and post-naupliar appendages, stomodeum, optical lobes, eyes, telson, embryo curvature and the space occupied by the embryo in the egg. Different rates of development were observed for the four species, with M. potiuna showing the longest time of embryogenesis. The species studied followed the pattern of embryogenesis of centrolecithal eggs, enabling the identification of similar features of the development, and the establishment of eight common embryonic stages.Foi estudado o desenvolvimento embrionário de quatro espécies de Palaemonidae em condições controladas de laboratório. Adultos de Macrobrachium olfersi (Wiegman, 1836, Macrobrachium potiuna (Müller, 1880, Palaemon pandaliformis (Stimpson, 1871 e Palaemonetes argentinus (Nobili, 1901 foram coletados na Ilha de Santa Catarina, SC, Brasil e mantidos à temperatura de 26ºC. Foram analisadas as seguintes características embrionárias: forma do ovo, organização do vitelo e planos de clivagem, apêndices naupliares e pós-naupliares, estomodeo, lobos ópticos, olhos, telson, curvatura do embrião e o espaço ocupado pelo embrião no ovo. Diferentes ritmos de desenvolvimento foram observados espécies, sendo que M. potiuna mostrou o maior tempo de embriogênese. As espécies seguem o padrão de embriogênese de ovos centrolécitos, sendo identificadas características similares do desenvolvimento, possibilitando o estabelecimento de oito estágios embrionários, comuns as quatro espécies.

  14. Relative growth, sexual dimorphism and morphometric maturity of Trichodactylus fluviatilis (Decapoda: Brachyura: Trichodactylidae from Santa Terezinha, Bahia, Brazil

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    Tiago Rozário da Silva

    2014-02-01

    Full Text Available Freshwater crabs are important elements in the aquatic biota of brooks, rivers, lakes and ponds, from both ecological and the socio-economic aspects. Trichodactylidae comprises 51 endemic species from the Neotropical region. Among all the species of this family, Trichodactylus fluviatilis Latreille, 1828 has the widest geographic distribution throughout Brazil. Despite that, there are few published contributions on the biology of this species. The present study investigated the following aspects of T. fluviatilis: relative growth, mean size at onset of morphometric maturity, sexual dimorphism, laterality and heterochely. Specimens were collected monthly from September 2010 through August 2011, from the Velha Eugênia Brook, municipality of Santa Teresinha, State of Bahia. Carapace width (CW, carapace length (CL, major cheliped length (MaCL and minor cheliped length (MiCL, major cheliped height (MaCH and minor cheliped height (MiCH, and width of the fifth abdominal segment (5AB were measured to evaluate the presence of sexual dimorphism; the major difference between the sexes was in the CW vs. 5AB ratio. Heterochely was observed in males and females,with the right cheliped larger than the left in 89% of males and 81% of females. Crab size at the onset of morphometric maturity (= puberty molt was estimated based on the ratio between CL, cheliped dimensions, 5AB and CW (independent variable. Females were larger than males when they reached morphometric maturity in all studied relations. We recommend the use of chelipeds and abdominal width relationships to estimate the size at the morphometric maturity in males and females, respectively.

  15. Complete mitochondrial genome of the Chinese spiny lobster Panulirus stimpsoni (Crustacea: Decapoda): genome characterization and phylogenetic considerations.

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    Liu, Yuan; Cui, Zhaoxia

    2011-01-01

    The genetics and molecular biology of the commercially important Chinese spiny lobster, Panulirus stimpsoni are little known. Here, we present the complete mitochondrial genome sequence of P. stimpsoni, determined by the long polymerase chain reaction and primer walking sequencing method. The entire genome is 15,677 bp in length, encoding the standard set of 13 protein-coding genes, two ribosomal RNA genes, and 22 transfer RNA genes. The overall A+T content of the genome is 65.6%, lower than most malacostracan species. The gene order is consistent with the pancrustacean ground pattern. Several conserved elements were identified from P. stimpsoni control region, viz. one [TA(A)]n-block, two GA-blocks and three hairpin structures. However, the position of [TA(A)]n-block and number of hairpin structure are different from those in the congeneric P. japonicus and other decapods. Phylogenetic analyses using the concatenated nucleotide and amino acid sequences of 13 protein-coding genes do not support the monophyly of suborder Pleocyemata, which is in contrast to most morphological and molecular results. However, the position of Palinura and Astacidea is unstable, as represented by the basal or sister branches to other Reptantia species. P. stimpsoni, as the second species of Palinura with complete mitochondrial genome available, will provide important information on both genomics and conservation biology of the group.

  16. Homarus gammarus (Crustacea: Decapoda) larvae under an ocean acidification scenario: Responses across different levels of biological organization.

    Science.gov (United States)

    Rato, Lénia D; Novais, Sara C; Lemos, Marco F L; Alves, Luís M F; Leandro, Sérgio M

    2017-09-17

    The present study evaluated the effects of exposure to different target pCO2 levels: control (C: 370μatm, pH = 8.15) and ocean acidification (OA: 710μatm, pH=7.85) on development and biochemical responses related with oxidative stress and energy metabolism during the crustacean Homarus gammarus (L.) larval development, integrating different levels of biological organization. After hatching in the laboratory, larvae from the same female brood were exposed to the described conditions from hatching until reaching Stage III (last larval stage - 11 days). H. gammarus larvae demonstrated some susceptibility when addressing the predicted pCO2 levels for 2100. Further analysis at the biochemical and physiological level highlighted the occurrence of oxidative stress in the OA scenario (Superoxide Dismutase reduction and higher DNA damage) that was followed by developmental effects, increased inter-moult period from SII to SIII and reduced growth. The extended exposure to these conditions may affect organisms' key life-cycle functions such as physiological resistance, growth, sexual maturation, or reproduction with implications in their future fitness and population dynamics. Copyright © 2017. Published by Elsevier Inc.

  17. Restocking Ucides cordatus (Decapoda: Ocypodidae: interespecific associations as a limiting factor to the survival of released recruits

    Directory of Open Access Journals (Sweden)

    Robson Ventura

    2010-09-01

    Full Text Available Simulations in the laboratory were used to investigate whether survivorship rates of Ucides cordatus youngsters produced in the laboratory are significantly affected by other crab species after their release in natural environments. Furthermore, it was investigated whether the release of first instar juveniles instead of megalopae would reduce the mortality related to interspecific predation. A preliminary estimate of the crab community structure in the target area of a restocking program was undertaken and indicated a great dominance of fiddler crabs (Uca spp. Based on this information, experiments were conducted to assess the ecological relationship between Ucides cordatus megalopae and first instar juveniles and fiddler crabs of different size classes in the presence of mangrove sediment, simulating natural conditions, as well as in the absence of any kind of refuge. It was observed that fiddler crabs not only compete with, and prey on U. cordatus youngsters, both as megalopae and juveniles. Furthermore, it was observed that the predation behavior of fiddler crabs is exercised only by individuals with carapaces wider than 0.5 cm. The results of the assay simulating natural conditions showed that, even when sediment was provided as a refuge, the same pattern was observed, with survivorship rates significantly lower in the presence of Uca crabs.Simulações em laboratório foram efetuadas visando investigar se após liberação na natureza a sobrevivência de recrutas de Ucides cordatus produzidos em laboratório é afetada por outras espécies de caranguejos. Adicionalmente, foi verificado se com a liberação de juvenis no estágio 1, ao invés de megalopas, haveria redução da mortalidade causada por predação interespecífica. Para tanto foi realizada estimativa prévia da estrutura da comunidade de caranguejos presente na área-alvo de um programa de repovoamento em desenvolvimento na região de Santo Amaro, Baía de Todos os Santos, Brazil, cujos resultados mostraram grande dominância de caranguejos violinista (Uca spp.. Com base nessa informação, foram realizados experimentos para verificar as relações ecológicas entre megalopas e juvenis 1 de Ucides cordatus e as diferentes classes de tamanho das outras espécies de Uca, em presença de sedimento do mangue, simulando condições naturais, e na ausência de refúgio. Observou-se que os caranguejos violinista competem predando tanto juvenis quanto megalopas de Ucides cordatus. Além disso, foi visto que esse comportamento de predação é exercido apenas por indivíduos com largura de carapaça maior que 0,5 cm. Os resultados do teste de simulação das condições do ambiente natural evidenciaram que o mesmo padrão de predação foi observado mesmo quando o sedimento foi oferecido como refúgio, sendo as taxas de sobrevivência significativamente menores na presença de espécies de Uca.

  18. "Candidatus Hepatobacter penaei," an intracellular pathogenic enteric bacterium in the hepatopancreas of the marine shrimp Penaeus vannamei (Crustacea: Decapoda).

    Science.gov (United States)

    Nunan, Linda M; Pantoja, Carlos R; Gomez-Jimenez, Silvia; Lightner, Donald V

    2013-02-01

    The bacteria that cause necrotizing hepatopancreatitis in Penaeus vannamei adversely affect penaeid shrimp cultured in the western hemisphere. 16S rRNA and gyrase B gene analyses determined the taxonomic position of these bacteria. The name "Candidatus Hepatobacter penaei" is proposed for these pathogenic bacteria, which are members of the Rickettsiales order.

  19. Contribuição ao conhecimento dos crustaceos do Rio de Janeiro: Genero Uca (Decapoda: Ocypodidae

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    Lejeune P. H. de Oliveira

    1939-01-01

    Full Text Available This paper comprises: 1 A note on Systematists of fiddler crabs from the Bay of Rio de Janeiro, with its new species Uca olympioi, Uca salsisitus, and a new variety U. pugnax var. brasiliensis. 2 Female Uca characterization is easier and infuse certainness when we inquire her third maxillipod. 3 Redescriptions are made for type-locality animals at Rio de Janeiro and nearness. 4 Male characterization become possible through its maxillipod if we lose its quelipod. 5 A historical referendary originating into indigenous dialect « Guarany » about the name Uca and brasilian nicknames of the fiddler crabs. 6 A few Uca species from the Rio de Janeiro determinative keys asked after main distinctions among others species described over the world in paragraph « diagnose diferencial ». 7 A collected material catalogue and some mensurement tables.

  20. Population biology of the burrowing crab Neohelice granulata, (Crustacea: Decapoda: Varunidae from a tropical mangrove in Brazil

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    Rafael A. Gregati

    2009-03-01

    Full Text Available The population biology of the burrowing crab Neohelice granulata (Dana, 1851 from a mangrove in Jabaquara Beach, Paraty, state of Rio de Janeiro, Brazil (23º13'04"S and 44º42'47"W, was studied with respect to the following traits: size-frequency distribution, recruitment, reproductive period, fecundity, and sex ratio. Specimens were sampled monthly from April, 2003 to March, 2004, at the river margins during low tide periods. Size, sex, presence of eggs, and stage of the female gonad were recorded. Ovigerous females had their eggs removed and counted. The reproductive period was continuous and the highest frequency of ovigerous females was recorded in the fall and winter. Mature gonads were found throughout the year and recruitment was continuous but more intense during the summer. The fecundity of N. granulata (30028.3 ± 10861.2 eggs was high in comparison to studies in other localities. In general, the proportion of males was similar to that of females (1:0.92; however, males were predominant in the fall (1:0.77 and winter (1:0.75. All the information available so far on the reproduction of N. granulata involves populations from subtropical salt marshes; therefore, comparative studies including other habitats, such as mangrove forests, are needed to further understand the environmental influences on the population and reproductive biology of semiterrestrial crabs.

  1. The distribution of the crayfishes Orconectes limosus (Rafinesque) and Astacus astacus (L.) (Crustacea, Decapoda) in the Netherlands

    NARCIS (Netherlands)

    Geelen, J.F.M.

    1978-01-01

    INTRODUCTION According to Holthuis (1950a) the family Astacidae is represented in the Netherlands only by one species, Astacus astacus (L., 1758). Apart from a detailed description of the external anatomy, he gave the following data. The average size of the adults amounts to 80 mm, however, the maxi

  2. Cambarus (Tubericambarus) polychromatus (Decapoda: Cambaridae) a new species of crayfish from Ohio, Kentucky, Indiana, Illinois and Michigan

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — A new species of crayfish Cambarus (Tubericambarus) polychromatus is described from western Ohio, Indiana, southern and east-central Illinois, western Kentucky, and...

  3. Two new species of South American freshwater crayfish genus Parastacus Huxley, 1879 (Crustacea: Decapoda: Parastacidae).

    Science.gov (United States)

    Ribeiro, Felipe Bezerra; Buckup, Ludwig; Gomes, Kelly Martinez; Araujo, Paula Beatriz

    2016-08-30

    Two new species of Parastacus Huxley, 1879 are described from material collected in the state of Rio Grande do Sul, southern Brazil: Parastacus fluviatilis sp. nov. from highland streams and Parastacus caeruleodactylus sp. nov. from wetlands. Parastacus fluviatilis sp. nov. is distinguished mainly by large chelipeds with dense setae cover on the cutting edge of fingers, telson subtriangular with two lateral blunt spines and strongly concave ventral surface of lateral process of thoracic sternites 6 and 7. Parastacus caeruleodactylus sp. nov. is distinguished mainly by blue cheliped fingers and a large gap between them, reduced abdomen, dorsal and ventral margins of dactylus, propodus and carpus of second pair of pereiopods with tufts of long setae and mid-dorsal carina of exopod of uropods unarmed. According to IUCN Red List criteria both species are considered endangered. Habitat characterization and a method for defining the shape of second abdominal pleura are also provided.

  4. EFFECTS OF TEMPERATURE AND Ca2+ ON THE LARVAL DEVELOPMENT OF THE DECAPODA CRUSTACEAN : ERIOCHEIR SINENSIS

    Institute of Scientific and Technical Information of China (English)

    黄勃; 堵南山; 赖伟

    2001-01-01

    With increasing demand in China for the mitten crab larvae, understanding its survival mechanism gets more important. This research focused on the effects of temperature and Ca2+ on the larval growth and development. Eriocheir sinensis larvae were reared in laboratory under 21 different combinations of temperature (15, 20, 25℃) and Ca2+ content (120, 130, 140, 150, 160, 170, 180mg/l) and constant salinity (20) and pH (8), The results suggested that the survival rate increases with temperature and Ca2+ content. These combinations of temperature and Ca2+ content maximized survival rate inour study and it may be the optimum water environmental conditions for culturing the larvae. To predict surviving larvae number under different water environmental conditions, 21 dynamic mathematical models were developed. This for the first time observation of the zoeal Ⅵ larvae of the Changjiang River E.sinensis population showed that they occurred under stressed water environmental conditions: temperature of 15℃ and Ca2+ content of 120,130mg/l.

  5. The recent genera of the Caridean and Stenopodidean shrimps (class Crustacea, order Decapoda, supersection Natantia) with keys for their determination

    NARCIS (Netherlands)

    Holthuis, L.B.

    1955-01-01

    CONTENTS Introduction.......... 1 Supersection Natantia ...... 2 Section Caridea....... . 7 Superfamily Oplophoroida ... 12 Family Oplophoridae .... 12 Family Nematocarcinidae . . 17 Family Atyidae ..... 18 Superfamily Stylodactyloida . . 31 Family Stylodactylidae ... 31 Superfamily Pasiphaeoida . .

  6. Maturation and growth curves of Macrobrachium Carcinus (Linnaeus) (Crustacea, Decapoda, Palaemonidae) from Ribeira de Iguape River, southern Brazil

    OpenAIRE

    Valenti,Wagner C; Jeanette de T.C. de Mello; Vera L Lobão

    1994-01-01

    In this paper, female Macrobrachium carcinus (Linnaeus, 1758) maturation curve, weight/length relationship, length and weight growth curves were studied. Prawns were captured, by traps, in Ribeira de Iguape river (24ºS and 47ºW), southern Brazil. There were used 207 females. It was observed that M. carcinus presents several spawnings during its life cycle and reproductive period goes on, at least till six years old. Weight/length relationship can be represented for the equation W = 8.73 E-3 L...

  7. Maturation and growth curves of Macrobrachium Carcinus (Linnaeus (Crustacea, Decapoda, Palaemonidae from Ribeira de Iguape River, southern Brazil

    Directory of Open Access Journals (Sweden)

    Wagner C Valenti

    1994-01-01

    Full Text Available In this paper, female Macrobrachium carcinus (Linnaeus, 1758 maturation curve, weight/length relationship, length and weight growth curves were studied. Prawns were captured, by traps, in Ribeira de Iguape river (24ºS and 47ºW, southern Brazil. There were used 207 females. It was observed that M. carcinus presents several spawnings during its life cycle and reproductive period goes on, at least till six years old. Weight/length relationship can be represented for the equation W = 8.73 E-3 L3.28. Expressions obtained for length and weight growth curves are Lt = 21 .0 (1-e-0493t and Wt= 190 (1-e-0493t3.28. respectively. A symptotic maximum length and asymptotic maximum weight are nearly attained at six and eight years old, respectively.

  8. Nutrición en juveniles del langostino Macrobrachium carcinus (Cmstacea: Decapoda) con dietas de residuos vegetales y marinos

    OpenAIRE

    Casas-Sánchez, Ruth; Vaillard-Nava, Yvette; Re-Araujo, Ana Denisse

    2015-01-01

    Juveniles del langostino Macrobrachium carcinus fueron alimentados con dos dietas: de desechos de restaurante (dieta 1) y de pescado y productos vegetales (dieta ll). Las dietas fueron evaluadas mediante análisis proximal, bioensayos de digestibilidad (Eficiencia de Asimilación), bioensayos de crecimiento y Factor de Conversión (FCR). A pesa:[" de que, los organismos asimilaron con mayor eficiencia la dieta 1, el crecimiento no fue diferente, siendo éste, en promedio para los tres meses del e...

  9. Natural diet and feeding habits of a freshwater prawn (Macrobrachium carcinus: Crustacea, Decapoda) in the estuary of the Amazon River.

    OpenAIRE

    LIMA, J.F.; GARCIA, J. da S.; SILVA, T. C. da

    2014-01-01

    Macrobrachium carcinus is a Brazilian native prawn with recognized potential for use in aquaculture activities. However, there is little information about the natural diet and feeding habits of this species. The aim of this study was the identification of the diet items of M. carcinus based on the analysis of the stomach contents. Specimens were collected in the Amazon River estuary between January 2009 and January 2010. The stomach analysis was carried out by using the frequency of occurrenc...

  10. Composition of shrimp populations (Crustacea: Decapoda in non-vegetated areas of two river islands in a Brazilian Amazon estuary

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    Priscila Sousa Vilela da Nóbrega

    2013-12-01

    Full Text Available This study investigates the shrimp found in non-vegetated areas of an estuary of the Amazon River. We ascertained the input of juveniles, species' biometrics and the influence of environmental factors on the abundance of species. The samples were collected monthly, from August 2006 to July 2007, in two places in the estuary, each next to an island. For collecting, we used a manual trawl to perform three hauls per month, totaling 36 samples per site. The abundance of shrimps was estimated as a function of the density of specimens per unit area. We used the Spearman's correlation to test the hypothesis that there is significant correlation between the average of the environmental variables measured and variations in shrimp density. The Kruskal-Wallis and the Mann-Whitney tests showed that there were significant differences in environment factors (temperature and salinity among the months and sites. We obtained 6,091 shrimps, from which 5,231 (85.88% were caught off the Arapiranga Island and 860 (14.12% off the Mosqueiro Island, Palaemonidae and Penaeidae were the only families recorded. Five species were collected: Macrobrachium amazonicum (Heller, 1862, Macrobrachium surinamicum Holthuis, 1948, Macrobrachium carcinus (Linnaeus, 1758, Macrobrachium rosenbergii (De Man, 1879, and Farfantepenaeus subtilis (Pérez-Farfante, 1967. The latter (pink shrimp was found for the first time in oligohaline environments (0-8. Macrobrachium amazonicum was the most abundant species. The recruitment of M. amazonicum juveniles was continuous throughout the year. The population of M. surinamicum was composed by juveniles and adults and that of F. subtilis exclusively by juveniles. The environmental factors analyzed were variable throughout the year and seem to explain the patterns of shrimp species occurrence in the region, the variation in their abundance and juvenile recruitment.

  11. The effect of astaxanthin on resistance of juvenile prawns Macrobrachium nipponense (Decapoda: Palaemonidae to physical and chemical stress

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    Babak Tizkar

    2014-12-01

    Full Text Available In recent years, the use of new scientific techniques has effectively improved aquaculture production processes. Astaxanthin has various properties in aquacultureand its antioxidant benefits have been closely related to stress resistance; besides, it is an essential factor for growth in many crustaceans and fish. The objective of this study was to evaluate the resistance of prawn (Macrobrachium nipponense fed diets containing different amounts of astaxanthin (AX to the shock and stress of differentphysicochemical environments. A 70-day trial was conducted to evaluate the effect of supplementation of a source of astaxanthin (Carophyll Pink, 10% astaxanthin, w/w, Hoffman-La Roche, Switzerland at various levels in the diet of M. nipponense juveniles. Four dry diets were prepared: AX0 without astaxanthin, AX50 with 50mg/kg, AX100 with 100mg/kg, and AX150 with 150mg/kg astaxanthin. The feeding trial was conducted in a recirculation water system consisting of 12 fiberglass tanks (1 000L used for holding prawns. Three replicate aquaria were initially stocked with 36org/m² per tank. During the trial, prawns were maintained on a 12:12-h light:dark photoperiod with an ordinary incandescent lamp, and the water quality parameters were maintained as follows: water temperature, 25-26°C; salinity, 1g/L; pH, 8.5-8.8; dissolved oxygen, 6.0-6.5mg/L; and ammonia-nitrogen, 0.05mg/L. Incorporation of AX, production output, and physiological condition were recorded after 10 weeks of feeding. At the end of the growing period, the prawns were exposed to thermal shock (0°C, ammonia (0.75mg/L, and reduced oxygen (0.5mg/L. The time to lethargyand the time to complete death of the prawns were recorded. The results showed that control prawns had the shortest time to lethargy and death compared with prawns subjected to the other treatments. The results of this study have shown that the amount of muscle tissue and gill carotenoids in prawn fed with an AX150 diet showed greater reduction than those exposed to other treatments. It is possible that higher levels of astaxanthin in the body under oxygen reduction stress can be beneficial forprawns. These results suggest that male prawns showed lethargy earlier than females, and the percentage of carotenoid reduction in muscle and gill tissues was higher inmales. Rev. Biol. Trop. 62 (4: 1331-1341. Epub 2014 December 01.

  12. Description of a new genus of Cryptochiridae (Decapoda: Brachyura associated with Siderastrea (Anthozoa: Scleractinia, with notes on feeding habits

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    Marcelle F.S. Badaro

    2012-08-01

    Full Text Available Members of the Cryptochiridae are small gall-crabs that live as obligate symbionts of scleractinian corals. Only two species have so far been recorded in the western Atlantic Ocean. Herein a new Cryptochiridae genus and species is described, and new information is added on the life history of cryptochirids. The new genus is characterized by having the carapace with the lowest deflection angle among the genera, and also shows the following features: thoracic sternite 4 with setules and constriction smaller than half of the width of the basis, anterior margin curved with apical row of granules; third maxilliped with subcircular exopod reaching medially the lateral margin of the ischium; pereiopod 2 with prominent distomesial and anterolateral expansion on the merus, propodus almost twice larger than dactylus; thoracic sternite 7 with complete medial suture, female pleopod 3 uniramous with longitudinal opening. Male first pleopod straight with subdistal curvature of approximately 90°. Individuals belonging to the new genus are found in galls in massive corals although this structure is cited as being characteristic of ramified corals. The long plumose setae of the maxilliped 3 suggest a filter-feeding function, but the toothless chelae suggest that they are used to gather mucus.

  13. MEDITS-based information on the deep water red shrimps Aristaeomorpha foliacea and Aristeus antennatus (Crustacea: Decapoda: Aristeidae

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    Angelo Cau

    2002-06-01

    Full Text Available The application of statistical models on a time series of data arising from the MEDITS International Trawl Survey, an experimental demersal resources survey carried out during six years (1994-1999 in the same season of the year (late spring - early summer using the same fishing gear in a large part of the Mediterranean, has allowed for a study to compare, for the first time, the space-time distribution, abundance, and size structure of the two Aristeids Aristaeomorpha foliacea and Aristeus antennatus throughout most of the Mediterranean Sea. This research has shown a large variability among the six reference areas, that were arbitrarily defined within the basin. In particular the two shrimps do not seem to present any correlation or yield continuity in the years. The same lack of homogeneity was also observed in the time trend of the abundances and frequencies of each of the two species. These data seem to confirm the intrinsic variability of the species, the cause of which is still unknown and undocumented. Nevertheless, a longitudinal gradient of catches has been observed where A. antennatus is more abundant in the west and A. foliacea in the east of the basin.

  14. Gonioinfradens paucidentatus (A. Milne Edwards, 1861 (Crustacea, Decapoda, Portunidae: a new alien crab in the Mediterranean Sea

    Directory of Open Access Journals (Sweden)

    M. CORSINI-FOKA

    2012-12-01

    Full Text Available The first record for the Mediterranean Sea of the Red Sea/Indo-Pacific portunid Gonioinfradens paucidentatus (red swimming crab is documented. A detailed description of the specimens collected at Rodos Island (southeastern Aegean Sea is given, while possible introduction vectors of the species in the area are discussed.

  15. ECOBIOLOGICAL STUDY ON BURROWING MUD LOBSTER THALASSINA ANOMALA (HERBST, 1804 (DECAPODA : THALASSINIDEA IN THE INTERTIDAL MANGROVE MUDFLAT OF DELTAIC SUNDARBANS

    Directory of Open Access Journals (Sweden)

    S. K. Dubey

    2012-07-01

    Full Text Available Populations of mud lobster Thalassina anomala were studied on tidal flats in the Sagar island of Indian Sundarbans. Ecologically they are recognized as the 'friends of mangrove' and a 'Biological Marvel' of the system. They turn up the deep soil to the surface by regular night shift burrowing exercise and help to import aerated tidal water in the burrows 2 to 2.5 meter deep. They have extra ordinary morphological adaptation and structural changes and completely resort to detritivore diet. Being thigmotactic it seldom exposes to atmospheric oxygen and forms its palace underground with a central chamber having 5 to 6 radiated tunnels opening to the surface covered with earth mounds. It displays its engineering skill of bioturbation in tunneling. During tunneling the shrimp feeds on the mud packed with detritus and derived its required micronutrients. Being mud dwelling and mud eating habits, it's respiratory and food manipulating apparatus underwent transformations which demands intensive investigation. Thalassinid burrow associates comprising mieo and microorganisms also provide good subject of study of species specific interaction, exchanging of materials between associate partners.

  16. Population structure of the red mangrove crab, Goniopsis cruentata (Decapoda: Grapsidae under different fishery impacts: Implications for resource management

    Directory of Open Access Journals (Sweden)

    Gustavo L. Hirose

    2015-06-01

    Full Text Available The red mangrove crab, Goniopsis cruentata, influences the recruitment and composition of plant species in the mangrove ecosystem and it is an important fishery resource. Nevertheless, no current management and conservation plans are available for this species for the Brazilian coast. This investigation evaluated the population structure and reproductive biology in populations of G. cruentata under contrasting fishery pressures. The sampling program was carried out in two mangroves, Vaza-Barris and Sergipe River, from January through December 2011. Crabs from both mangroves were randomly collected by a professional fisherman during daytime low tide periods, using a fishing rod baited with pieces of a locally abundant gastropod, Pugilina morio, during 20min/area (catch per unit effort. Monthly measurements of air, sediment surface layer and water temperatures were obtained with a digital thermometer and salinity with an optical refractometer. Both crab populations were compared concerning their abundance, body size, sex ratio, size at onset of sexual maturity and fecundity (FI. Abiotic factors (air, water and mud temperature; and salinity showed no significant differences between sampling localities. A total of 4 370 crabs were sampled, 2 829 from the Sergipe River and 1 541 from the Vaza-Barris River. The abundance and body size of crabs were compared between mangroves, and statistically significant differences were found. The sex ratio for both populations differed from the expected 1:1 ratio, and a significant deviation in favor of juvenile males was obtained, while adults showed a bias toward females. The estimated size at onset of sexual maturity for both sexes was similar in both populations. However, the populations differed significantly in the number and volume of eggs: a higher FI was obtained in females from the Sergipe River, while a higher egg volume was observed in females from the Vaza-Barris River mangrove. These results indicated a tendency to decrease the body size, the abundance of crabs and the reproductive potential of the species, with higher fishing intensities, reinforcing the need to develop a management plan as well as to establish conservation units for G. cruentata in the Northeastern Brazilian coast. Habitat loss in conjunction with long-term overfishing can have irreversible consequences, which can impact not only the populations of commercially exploited crabs, but the dynamics of virtually the entire mangrove ecosystem.

  17. Gonioinfradens paucidentatus (A. Milne Edwards, 1861 (Crustacea, Decapoda, Portunidae: a new alien crab in the Mediterranean Sea

    Directory of Open Access Journals (Sweden)

    M. CORSINI-FOKA

    2010-11-01

    Full Text Available The first record for the Mediterranean Sea of the Red Sea/Indo-Pacific portunid Gonioinfradens paucidentatus (red swimming crab is documented. A detailed description of the specimens collected at Rodos Island (southeastern Aegean Sea is given, while possible introduction vectors of the species in the area are discussed.

  18. Ghost shrimp Calliax de Saint Laurent, 1973 (Decapoda: Axiidea: Callianassidae) in the fossil record: systematics, palaeoecology and palaeobiogeography

    Science.gov (United States)

    HYŽNÝ, MATÚŠ; GAŠPARIČ, ROK

    2015-01-01

    Ghost shrimps of the family Callianassidae are very common in the fossil record, but mostly as isolated cheliped elements only. The assignment to biologically defined genera, diagnosed on the basis of soft part morphology, is thus rather difficult. In this respect, proxy characters present on chelipeds that are the most durable ghost shrimp remains are needed to ascribe fossil material to extant genera. The genus Calliax de Saint Laurent, 1973 has been particularly obscure in this respect. Thorough comparison of extant members of the genus resulted in evaluation of characters present on chelipeds being taxonomically important on the genus level, specifically: 1) rectangular major P1 propodus with two ridges on the base of the fixed finger extending onto manus; 2) major P1 fingers relatively short; and 3) minor P1 chela with dactylus longer than fixed finger and possessing a wide gap between fingers. On this basis, Callianassa michelottii A. Milne Edwards, 1860, from the Oligocene and Miocene of Europe is herein reassigned to Calliax. Further re-examination of the ghost shrimp fossil record revealed that C. szobensis Müller, 1984, from the Middle Miocene of Hungary represents the same animal as C. michelottii and they are synomymised herein. The known geographic distribution of C. michelottii is expanded by the first confirmed occurrence of the species in Slovakia. All occurrences of C. michelottii known to date are reviewed and documented. The presence of Calliax michelottii comb. nov. may be considered an indicator of deeper marine settings. Based on the scarce fossil record known to date, Calliax has a Tethyan origin; it supposedly migrated westward to establish present day communities in the Caribbean sometime before the Middle Miocene. PMID:24989725

  19. Morphology of the first zoeal stages of five species of the portunid genus Callinectes (Decapoda, Brachyura hatched at the laboratory

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    FERNANDO L. MANTELATTO

    2014-06-01

    Full Text Available The genus Callinectes Stimpson, 1860 currently consists of 16 species, six of which are reported in Brazilian coast. In the present study, the first zoeal stages of Callinectes bocourti,C. danae, C. exasperatus, C. ornatus and C. sapidus from Brazil were obtained from ovigerous females. The morphological and meristic characters of all these larval stages are described and illustrated. Those of C. bocourti, C. danae and C. sapidus are redescribed and compared with the previous descriptions, and differences are listed. Larval characters of these species were examined for interspecific differences, as well as larval features to distinguish the genus Callinectes within Portunidae. In addition, other portunid genera and species with a known first zoeal stage are compared, with special attention to those species present in the same geographical area. Our findings concord with some previous molecular studies, and we discuss the complexity within the group.

  20. Morphology of the first zoeal stages of five species of the portunid genus Callinectes (Decapoda, Brachyura) hatched at the laboratory.

    Science.gov (United States)

    Mantelatto, Fernando L; Reigada, Alvaro L D; Gatti, Aline C R; Cuesta, José A

    2014-05-23

    The genus Callinectes Stimpson, 1860 currently consists of 16 species, six of which are reported in Brazilian coast. In the present study, the first zoeal stages of Callinectes bocourti, C. danae, C. exasperatus, C. ornatus and C. sapidus from Brazil were obtained from ovigerous females. The morphological and meristic characters of all these larval stages are described and illustrated. Those of C. bocourti, C. danae and C. sapidus are redescribed and compared with the previous descriptions, and differences are listed. Larval characters of these species were examined for interspecific differences, as well as larval features to distinguish the genus Callinectes within Portunidae. In addition, other portunid genera and species with a known first zoeal stage are compared, with special attention to those species present in the same geographical area. Our findings concord with some previous molecular studies, and we discuss the complexity within the group.

  1. On a collection of Leucosioidea (Crustacea, Decapoda, Brachyura from Papua New Guinea, with the description of a new species

    Directory of Open Access Journals (Sweden)

    Bella S. Galil

    2015-11-01

    Full Text Available The collection of deep-sea pebble crabs (Leucosioidea during the BIOPAPUA Expedition, comprising 8 species, including a species new to science, is significant because although the previously described species had not been recorded from the Bismarck and western Solomon Seas, they occurred in at least one nearby location (New Caledonia, Vanuatu, Solomon Is. Praebebalia fungifera sp. nov. is described and illustrated. It differs from its closest congener, P. septemspinosa Sakai, 1983, in bearing fungiform granules dorsally on carapace, shorter chelipeds, the relatively stout male first gonopod with a preapical row of setae and the beak-like tip, as compared to the rounded granules dorsally on the carapace, greatly elongate chelipeds and the slim, elongate, distally curved gonopod of P. septemspinosa, preapically set with very long setae and a hook-like tip.

  2. New distributional records of the stygobitic crayfish Cambarus cryptodytes (Decapoda: Cambaridae) in the Floridan Aquifer System of southwestern Georgia

    Science.gov (United States)

    Fenolio, Dante B.; Niemiller, Matthew L.; Gluesenkamp, Andrew G.; Mckee, Anna; Taylor, Steven J.

    2017-01-01

    Cambarus cryptodytes (Dougherty Plain Cave Crayfish) is an obligate inhabitant of groundwater habitats (i.e., a stygobiont) with troglomorphic adaptations in the Floridan aquifer system of southwestern Georgia and adjacent Florida panhandle, particularly in the Dougherty Plain and Marianna Lowlands. Documented occurrences of Dougherty Plain Cave Crayfish are spatially distributed as 2 primary clusters separated by a region where few caves and springs have been documented; however, the paucity of humanly accessible karst features in this intermediate region has inhibited investigation of the species' distribution. To work around this constraint, we employed bottle traps to sample for Dougherty Plain Cave Crayfish and other groundwater fauna in 18 groundwater-monitoring wells that access the Floridan aquifer system in 10 counties in southwestern Georgia. We captured 32 Dougherty Plain Cave Crayfish in 9 wells in 8 counties between September 2014 and August 2015. We detected crayfish at depths ranging from 17.9 m to 40.6 m, and established new county records for Early, Miller, Mitchell, and Seminole counties in Georgia, increasing the number of occurrences in Georgia from 8 to 17 sites. In addition, a new US Geological Survey (USGS) Hydrologic Unit Code 8 (HUC8) watershed record was established for the Spring Creek watershed. These new records fill in the distribution gap between the 2 previously known clusters in Georgia and Jackson County, FL. Furthermore, this study demonstrates that deployment of bottle traps in groundwater-monitoring wells can be an effective approach to presence—absence surveys of stygobionts, especially in areas where surface access to groundwater is limited.

  3. A new species of portunid crab of the genus Charybdis (De Haan, 1833) (Crustacea: Decapoda: Brachyura) from Goa, India

    Digital Repository Service at National Institute of Oceanography (India)

    Padate, V.P.; Rivonker, C.U.; Anil, A.C.; Sawant, S.S.; Venkat, K.

    on the Crabs obtained by the F.I.S. “Endeavour” on the coasts of Queensland, New South Wales, Victoria, South Australia and Tasmania. Commonwealth of Australia, Fisheries 5:95-155, Plates XVII-XLII. Rathbun M. 1923b. Descriptions of new species of crabs from...

  4. Note on the occurrence of a rare palaemonid prawn, Palaemonsewelli (Kemp, 1925) in South Vietnam, with its description (Decapoda: Caridea)

    NARCIS (Netherlands)

    Xuân, Ng.V.

    2000-01-01

    A rare palaemonid prawn Palaemon sewelli (Kemp, 1925) was found in abundance in a shallow and flat coastal region of southeastern Vietnam, at a depth of 4-9 m. This is the first record of the species from Vietnam. A description of the two colour morphs of the freshly collected specimens and notes on

  5. Great unexpected differences between two populations of the intertidal crab Neohelice granulata inhabiting close but contrasting habitats (Crustacea: Decapoda: Brachyura

    Directory of Open Access Journals (Sweden)

    Eduardo D. Spivak

    Full Text Available ABSTRACT Two populations of the Southwestern Atlantic burrowing crab, Neohelice granulata (Dana, 1851, are separated by only 190 km. They inhabit bays that drain into a Patagonian gulf in the southernmost limit of the geographical distribution of the species: San Antonio Bay (SAO and San José Gulf (RSJ. The population from SAO has been extensively studied, whereas that of RSJ has not. The main goal of this study is to compare the ecological and habitat characteristics of the two populations, based on samples collected on successive days during the middle of the reproductive season of the crab. The substrate of SAO is composed of a high proportion of gravel and scarce organic matter, whereas the substrate of RSJ presents twice as much silt and clay, and greater organic matter content. Crabs of both sexes were larger at RSJ. Fecundity and reproductive output were greater at RSJ. The size of females at maturity was smaller and their range was shorter at RSJ. Burrows were longer and wider at RSJ. Our results indicate that there are strong differences between the two populations, which might be correlated with local environmental differences, mainly substrate granulometry and food availability.

  6. A new species of Parastacus Huxley, 1879 (Crustacea, Decapoda, Parastacidae from a swamp forest in southern Brazil

    Directory of Open Access Journals (Sweden)

    Felipe Bezerra Ribeiro

    Full Text Available Abstract In this contribution we describe a new species of burrowing crayfish of the genus Parastacus Huxley, 1879 from a swamp forest in southern Brazil and determine its conservation status. The distinction of the new species is based on morphology and the mitochondrial DNA marker 16S rRNA. The extinction risk was assessed according to the sub-criterion B1 of IUCN that estimates the Extent of Occurrence (EOO. Parastacus tuerkayi sp. nov. is morphologically distinguishable from all species of Parastacus by having three lines of verrucous tubercles on the dorsomesial margin of the cheliped propodus and a suborbital angle exceeding 90°. The EOO comprises 647,674 km², and the species is classified as “endangered”. Phylogenetic relationships indicate the distinct position of this new species in relation to the already described species.

  7. [Temporal and spatial distribution of the crab Callinectes sapidus (Decapoda: Portunidae) in Chetumal Bay, Quintana Roo, Mexico].

    Science.gov (United States)

    Ortiz-León, Héctor J; Jesús-Navarrete, Alberto de; Cordero, Eloy Sosa

    2007-03-01

    In order to determine temporal and spatial distribution patterns of Callinectes sapidus, samplings were carried out during the cold-front (January-February), dry (May-June) and rainy (August-September, 2002) climatic seasons, in 30 sampling stations of Chetumal Bay, grouped in sectors A (14 stations), B (eight stations) and C (eight stations). In each sampling station crabs were collected from two transects parallel to the coast, each with three traps, separated by 30 m. Sediments were calcareous coarse and medium sand, white or lightly gray. A total of 1 031 specimens were collected. CPEU (Capture Per Effort Unit) differed spatially and temporally. Highest CPEU was found in sector C with 1.3 ind.trap(-1), and in the rainy season with 1.1 ind.trap(-1). Population was predominantly composed of male individuals. The male:female ratio was 15:1. Males and adults (group II) CPEU was significant different between sectors and climatic seasons. Both males and adults (group II) had a greater CPEU in sector C (1.2 ind.trap-) and in the rainy season (1.1 ind.trap(-1)). Abundance of female and juvenile individuals (group I) was low during the sampling period whereas group 0 juvenile individuals were not found. A greater relative frequency between sectors and climatic seasons were observed in 130-139 mm and 140-149 mm size interval (CW). C. sapidus occurred on sandy sediments in Chetumal Bay. Pearson product moment correlations exhibited significant relationships between CPEU and temperature, salinity and dissolved oxygen. In Chetumal Bay, the spatial and temporal distribution of C. sapidus can be related to salinity, temperature, habitat quality, food availability, recruitment and reproduction events of individuals.

  8. Life history of the ghost shrimp, Callianassa japonica ortmann (Decapoda: Thalassinidea), on an intertidal sandflat in western Kyushu, Japan

    Digital Repository Service at National Institute of Oceanography (India)

    Tamaki, A.; Ingole, B.S.; Ikebe, K.; Muramatsu, K.; Taka, M.; Tanaka, M.

    , occurring in July-August (1st cohort) and September-November (2nd cohort). The higher growth rate of individuals after recruitment in the 1st cohort enhanced the separation of the two cohorts. Between sexes, the subsequent life history patterns...

  9. First field record of mangrove crab Ucides cordatus (Crustacea: Decapoda: Ucididae recruits co-inhabiting burrows of conspecific crabs

    Directory of Open Access Journals (Sweden)

    Anders Jensen Schmidt

    2009-12-01

    Full Text Available Recruits of the mangrove crab Ucides cordatus (Linnaeus, 1763, rarely encountered in the field were found co-inhabiting burrows of larger male and female conspecifics in the mangrove forest. They were located in the sediment of the inner walls and burrow plugs. Average carapace width (CW of the hosting and co-inhabiting crabs was 3.8 ± 0.20 and 0.9 ± 0.03, respectively. As shown by the size-frequency distribution, while most recruits leave the conspecific burrows after reaching 1.0 cm CW, some stay until they reach a size of 2.5 cm CW. The results of this study contribute to a better understanding of recruitment patterns in this ecologically and economically important mangrove crab species. Follow-up studies are however needed to fully determine the role of conspecific burrows for juvenile habitat choice and survivorship in U. cordatus.

  10. Comparative study of freshwater crayfish, Cherax spp. (crustaceae: decapoda: parastacidae) from Papua, Indonesia based on length-weight analysis

    Science.gov (United States)

    Hamidah, H.; Abinawanto, Bowolaksono, A.

    2017-07-01

    The freshwater crayfish is one of the most important fish species as the protein resources. Lake and rivers are the habitat of crayfish in Papua. Morphological characters of crayfish, such as color, total body lengths (L) and body weight (W) were influenced by the habitat. The purpose of the study, therefore, was to compare the total body length and body weight as well as the unique color of crayfish from Uter lake (Atinjo district), Seremuk river (Haha village), Baliem river (Pike village; Hubukiak district, Jayawijaya), and Baliem river (Wesaput village; Wesaput district). Length-weight (body length; LB versus wet weight; WWT) relationships were determined for male and female crayfish (Cherax spp.) The length-weight relationships of total individuals was W = 0,022215.L3,159. This regression differed significantly (R2 = 97.5 %) between locations. Both males and females exhibited positive allometric growth as statistical difference was observed in the mean of the wet weight and body length between males and females. Besides, Canonical function was subjected to determine population distribution based on length-weight data.

  11. First occurrence of a Hymenosomatid crab Elamena mathoei (Desmarest, 1823 (Crustacea: Decapoda: Brachyura in the Mediterranean Sea

    Directory of Open Access Journals (Sweden)

    J. ZAOUALI

    2013-07-01

    Full Text Available Mediterranean fauna is undergoing drastic modifications as a result of anthropogenic activities and global warming. The most important of these is the colonization of the Mediterranean Sea by alien species, many of them entering through the Suez Canal. While many of them are still confined to the Levant Basin, several have extended their distribution westwards to Tunisian waters. The presence of the Indo-west Pacific hymenosomatid crab Elamena mathoei on a rocky shore at Sidi Daoud, Cape Bon Peninsula, Tunisia, is the first Mediterranean record of this species. It is a testimony to the changes in the patterns of invasion in the Mediterranean Sea.

  12. Habitat Preferences and Distribution of the Freshwater Shrimps of the Genus Caridina (Crustacea: Decapoda: Atyidae in Lake Lindu, Sulawesi, Indonesia

    Directory of Open Access Journals (Sweden)

    Annawaty

    2016-04-01

    Full Text Available The objectives of this study were to reveal ecological preferences and distribution of all species of Caridina found in Lake Lindu and their catchment area. Specimens from 39 sampling sites were caught using tray net and hand net. There are three species of Caridina found in the lake system, i.e. Caridina linduensis, Caridina kaili and Caridina dali. There is no overlapping distribution among the species. Caridina kaili is a true riverine species and it is never encountered sympatric with C. dali nor C. linduensis. This species is abundant in streams and ditches with moderate flow running water and gravel–cobble substrate. It is mainly spread within streams west to the lake. Both C. dali and C. linduensis can be found in the lake and streams with very slow current to almost stagnant water, muddy sand substrate and associated with roots of water plants and leaf litter. However, C. dali is never occurred together with C. linduensis and they are less abundant compare to C. kaili. Distribution of Caridina spp. in Lake Lindu is probably affected by the temperature of their habitats and the occurrence of introduced fish such as Mozambique tilapia (Oreochromis mossambicus, common carp (Cyprinus carpio, and an alien riceland prawn (Macrobrachium lanchesteri. These introduced and alien species can have the potency to become predators or competitors for the Caridina spp. It is also the first record for M. lanchesteri present in Lake Lindu.

  13. The recent genera of the Caridean and Stenopodidean shrimps (class Crustacea, order Decapoda, supersection Natantia) with keys for their determination

    NARCIS (Netherlands)

    Holthuis, L.B.

    1955-01-01

    CONTENTS Introduction.......... 1 Supersection Natantia ...... 2 Section Caridea....... . 7 Superfamily Oplophoroida ... 12 Family Oplophoridae .... 12 Family Nematocarcinidae . . 17 Family Atyidae ..... 18 Superfamily Stylodactyloida . . 31 Family Stylodactylidae ... 31 Superfamily Pasiphaeoida . .

  14. A new early brachyuran (Crustacea, Decapoda) from the Middle Jurassic of northwest France, epibionts and ecological considerations

    NARCIS (Netherlands)

    Robin, N.; Bakel, van B.W.M.; Hondt, d' J.-L.; Charbonnier, S.

    2015-01-01

    The earliest known crabs are of Early and Middle Jurassic age; in general, they are rare. Here we describe a new species of homolodromioid from the late Bathonian of Sarthe (France), based on a single dorsal carapace, Tanidromites raboeufi n. sp. This specimen has mostly well-preserved cuticle, and

  15. Phylogeny and evolution of life history strategies of the Parasitic Barnacles (Crustacea, Cirripedia, Rhizocephala)

    DEFF Research Database (Denmark)

    Glenner, Henrik; Hebsgaard, Martin Bay

    2006-01-01

    The barnacles (Crustacea, Cirripedia) consist of three well-defined orders: the conventional filter-feeding barnacles (Thoracica), the burrowing barnacles (Acrothoracica), and the parasitic barnacles (Rhizocephala). Thoracica and Acrothoracica feed by catching food particles from the surrounding ...... crustaceans (Anomura), which includes hermit crabs and squat lobsters....

  16. CHARACTERIZATION OF MICROSATELLITE LOCI IN THE EUROPEAN GREEN CRAB (CARCINUS MAENAS)

    Science.gov (United States)

    Carcinus maenas (Decapoda: Portunidae) has proven a highly successful invasive marine species whose potential economic and ecological impacts are of great concern worldwide. Here, we characterize fourteen polymorphic microsatellite loci in C. maenas and its sister species C. Ae...

  17. 50 CFR Appendix A to Part 622 - Species Tables

    Science.gov (United States)

    2010-10-01

    ...., Cleaner shrimp Family Squillidae, Mantis crabs Gonodactylus spp. Lysiosquilla spp. Family Stenopodidae.... Crustaceans—Subphylum Crustacea 1. Decapods—Order Decapoda Family Alpheidae Alpheaus armatus, Snapping shrimp... gibbesi, Nimble spray crab Family Hippolytidae Lysmata spp., Peppermint shrimp Thor amboinensis, Anemone...

  18. A new species of Cacosternum (Amphibia: Anura; Ranidae) from Natal

    African Journals Online (AJOL)

    1987-03-29

    Mar 29, 1987 ... African distribution of a tropical freshwater shrimp. Caridina nilotica (Decapoda: ... Energy requirements of the tropical freshwater shrimp Caridina ... JOHNSON, D.S. 1973. Notes on ..... function of this habitat. S. Afr. J. Zool.

  19. Zooplankton composition and diversity in western Bay of Bengal

    Digital Repository Service at National Institute of Oceanography (India)

    Nair, S.R.S.; Nair, V.R.; Achuthankutty, C.T.; Madhupratap, M.

    higher standing stock. Copepoda formed the dominant group followed by Decapoda and Chaetognatha. Species composition of various groups and their distribution is discussed. A general inverse relationship between biomass and species diversity was the trend...

  20. 南海溪蟹属一新种记述(十足目:溪蟹科)%A New Species of the Genus Nanhaipotamon (Decapoda:Potamidae) from China

    Institute of Scientific and Technical Information of China (English)

    林国华; 程由注; 陈韶红

    2012-01-01

    Objective To investigate the species of freshwater crabs in Fujian Province, China. Methods Fresh-water crabs were collected in Pingtan County of Fujian Province. The morphological characteristics of the crabs and the habitats were observed. The crab morphology was described and crabs examined for the presence of Paragonimus metacerariae. Results A new species of freshwater crabs named Nanhaipotamon pingtanense sp. nov. was obtained, holotype(FJ6133,l): ♂ , carapace length 36.1mm, breadth 46.8 mm, thickness 26.7 mm; allotype (FJ6133,2): ♀ , carapace length 33.9 mm, breadth 42.7 mm, thickness 25.4 mm, collected from Pingtan County (N 26°52.958'; E 119°58.722', and 16-47 m above sea lever). Distal segment of the first male pleopod with squarish-rounded inner-distal angle, and the comparatively stout out-distal angle's end narrowed. The out-lateral border sloped downwards, concave situated in the middle. The segment length is 2.3 times as long as the subdistal segment. This species usually lived in the ditch and hid in mud hole. Paragonimus metacercariae were not found. Conclusion A new species of Nanhaipotamon collected from Pingtan County of Fujian Province were described, and named as Nanhaipotamon pingtanense.%目的 调查福建省淡水蟹类的种类. 方法 采集福建省平潭县淡水蟹标本,进行形态学观察,调查孳生地和蟹感染并殖吸虫情况. 结果 发现一新种,定名为平潭南海溪蟹Nanhaipotamon pingtanense sp.nov..平潭南海溪蟹正模(FJ6133,1)♂,头胸甲长36.1 mm,宽46.8 mm,厚26.7 mm;配模(FJ6133,2)♀,头胸甲长33.9 mm,宽42.7 mm,厚25.4 mm.雄性第1腹肢末节内末角方圆形,外末角粗壮,外末角末缘趋于窄小,外侧缘中部内凹;末第2节为末节的2.3倍.该蟹多栖息于水沟中,以泥洞穴居.采集的32只平潭南海溪蟹中未查见并殖吸虫囊蚴. 结论 记述采自福建省平潭县南海溪蟹属一新种,并与南海溪蟹中近似种的鉴别特征进行了分析讨论.

  1. Latitudinal patterns in the life-history traits of three isolated Atlantic populations of the deep-water shrimp Plesionika edwardsii (Decapoda, Pandalidae)

    Science.gov (United States)

    González, José A.; Pajuelo, José G.; Triay-Portella, Raül; Ruiz-Díaz, Raquel; Delgado, João; Góis, Ana R.; Martins, Albertino

    2016-11-01

    Patterns in the life-history traits of the pandalid shrimp Plesionika edwardsii are studied for the first time in three isolated Atlantic populations (Madeira, Canaries and Cape Verde Islands) to gain an understanding of their latitudinal variations. The maximum carapace size of the populations studied, as well as the maximum weight, showed clear latitudinal patterns. The patterns observed may be a consequence of the temperature experienced by shrimps during development, 1.37 ° C higher in the Canaries and 5.96 ° C higher in the Cape Verde Islands than in Madeira. These temperature differences among populations may have induced phenotypic plasticity because the observed final body size decreased as the temperature increased. A latitudinal north-south pattern was also observed in the maximum size of ovigerous females, with larger sizes found in the Madeira area and lower sizes observed in the Cape Verde Islands. A similar pattern was observed in the brood size and maximum egg size. Females of P. edwardsii produced smaller eggs in the Cape Verde Islands than did those at the higher latitude in Madeira. P. edwardsii was larger at sexual maturity in Madeira than in the Cape Verde Islands. The relative size at sexual maturity is not affected by latitude or environmental factors and is the same in the three areas studied, varying slightly between 0.568 and 0.585. P. edwardsii had a long reproductive season with ovigerous females observed all year round, although latitudinal variations were observed. Seasonally, there were more ovigerous females in spring and summer in Madeira and from winter to summer in the Cape Verde Islands. P. edwardsii showed a latitudinal pattern in size, with asymptotic size and growth rate showing a latitudinal compensation gradient as a result of an increased growth performance in the Madeira population compared to that of the Cape Verde Islands.

  2. A new record of the giant freshwater prawn, Macrobrachium spinipes (Schenkel, 1902) (Crustacea: Decapoda: Palaemonidae) from Taiwan, with notes on its taxonomy.

    Science.gov (United States)

    Shy, Jhy-Yun; Wowor, Daisy; Ng, Peter K L

    2013-11-04

    The giant freshwater prawn Macrobrachium spinipes (Schenkel, 1902) is recorded from Taiwan for the first time and extends the distribution of the species to north of the Tropic of Cancer. The Taiwanese specimens differ slightly from material from Indonesian Papua in the density of the spination of the adult second pereipods, the relative length of the ridge of the posterior submedian plate of thoracite sternite 4, and the color of the carapace, abdomen and pleural condyles.

  3. [Impact of surface temperature and salinity on the recruiting of the pink shrimp Farfantepenaeus duorarum (Decapoda: Penaeidae), in Sonda de Campeche, Gulf of Mexico].

    Science.gov (United States)

    Ramírez-Rodríguez, Mauricio; Arreguín-Sánchez, Francisco; Lluch-Belda, Daniel

    2006-12-01

    We studied the long term effects of two environmental variables, salinity and surface temperature, on the pink shrimp (Farfantepenaeus duorarum) population in the southern Gulf of Mexico, considering the relationship between recruiting and the concurrent shrimp stock depletion of the last two decades. Our data were collected from 1969 to 1991. Recruitment has been clearly declining, particularly in the 1970s, with an accentuated drop since the 1980s. Sea surface temperatures have steadily risen, particularly since 1972. The temperature difference between the mid 1970s and the late 1980s is 0.5 degree C. Salinity decreased throughout the period. From a long term perspective, recruitment is negatively correlated with temperature and positively correlated with salinity. The effects of temperature and salinity are statistically significant, explaining 52 % and 55 % of the variation in recruitment, respectively.

  4. Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura, Potamidae)

    Science.gov (United States)

    Xue, Junzeng; Liu, Yan; Cumberlidge, Neil; Wu, Huixian

    2013-05-01

    This study expands on recent reports that direct development in the Chinese potamid freshwater crab Sinopotamon yangtsekiense involves the completion of all brachyuran larval stages (nauplius, zoea, and megalopa) inside the egg case during embryonic development. Detailed studies of embryonic development in this species revealed the presence of an additional larval stage (the egg-juvenile) between the megalopa and the free-living hatchling crab. We described and compared the appendages of the head, thorax, and abdomen of the egg-juvenile with those of the hatchling crab in S. yangtsekiense. Significant differences were found between most of the appendages of these two stages with a soft exoskeleton in the egg-juvenile, no joint articulation, a slimmer appearance, and a lack of setae when compared with the newly emerged free-living hatchling crab. These modifications of the appendages are related to the confinement within the egg case of the egg-megalopa and egg-juvenile during direct development, and the need for the free-living hatchling freshwater crab to move, feed, and respire. In marine crabs, the megalopa gives rise to the first crab stage whereas in freshwater crabs the egg-juvenile follows the megalopa and immediately precedes the free-living first crab stage.

  5. Effect of environmental salinity and dopamine injections on key digestive enzymes in hepatopancreas of the euryhaline crab Cyrtograpsus angulatus (Decapoda: Brachyura: Varunidae

    Directory of Open Access Journals (Sweden)

    María Soledad Michiels

    2013-03-01

    Full Text Available We studied the occurrence and characteristics of lipase activity and the response of lipase and proteolytic activity to salinity and dopamine injections in hepatopancreas of the euryhaline crab (Cyrtograpsus angulatus. Lipase activity was maximal at pH 8.5; it exhibited Michaelis-Menten kinetics (apparent Km=0.019 mM, was higher at 37°C and appeared to be cold tolerant, being also high at 4°C. In 10 psu (hyper-regulation conditions, lipase and proteolytic activity were about 3 and 5 times higher, respectively, than in 35 psu (osmoconformation. In 40 psu (hypo-regulation, lipase activity was about three times higher than in 35 psu, while proteolytic activity was similar. Lipase activity was inhibited in vivo by 10–4 M dopamine in 35 psu but not in 10 or 40 psu. Proteolytic activity was not affected by 10–4 M dopamine. The differential responses of lipase and proteolytic activity to salinity and dopamine suggest the occurrence of distinct digestive adjustments and mechanisms of regulation upon osmoregulatory conditions. This study contributes to a better understanding of the complexity of the biochemical adaptations to salinity in euryhaline crabs. The fact that higher digestive enzyme activities could be associated with a differential digestive capacity potentially leading to enhanced availability of energy substrates is discussed.

  6. New and additional records of Salmoneus Holthuis, 1955 (Decapoda, Caridea, Alpheidae from Brazil, with a key to the southern Atlantic species

    Directory of Open Access Journals (Sweden)

    Arthur Anker

    2013-01-01

    Full Text Available Two species of the alpheid shrimp genus Salmoneus Holthuis, 1955, are reported from shallow waters of São Sebastião (SP, southeastern Brazil. Salmoneus depressus Anker, 2011 is recorded for the first time in Brazil and the southwestern Atlantic; this species was previously known only from the Caribbean region. Salmoneus ortmanni (Rankin, 1898 is recorded for the first time in southern Brazil (23°S, being previously known in Brazilian waters from a single confirmed record from Atol das Rocas (03°S, with older records referring to Salmoneus carvachoi Anker, 2007. A hitherto unknown morphological variation in S. depressus is discussed and illustrated. Both species are shown in colour to facilitate their identification in the field. A key to the southern Atlantic species of Salmoneus is also provided.

  7. Species diversity and distribution of freshwater crabs (Decapoda: Pseudothelphusidae inhabiting the basin of the Rio Grande de Térraba, Pacific slope of Costa Rica

    Directory of Open Access Journals (Sweden)

    Luis Rólier Lara

    2013-09-01

    Full Text Available During the last decades, knowledge on biodiversity of freshwater decapods has increased considerably; however, information about ecology of these crustaceans is scarce. Currently, the freshwater decapod fauna of Costa Rica is comprised by representatives of three families (Caridea: Palaemonidae and Atyidae; Brachyura: Pseudothelphusidae. The present study aims to describe the species diversity and distribution of freshwater crabs inhabiting the basin of the Rio Grande de Térraba, Pacific slope of Costa Rica, where the Instituto Costarricense de Electricidad (ICE plans to implement one of the largest damming projects in the region. Samples were collected in 39 locations at an altitude ranging from 20 to 1,225 m. Sampling was carried out during several months in 2007, 2009 and 2010. We collected a total of 661 crabs, comprising eight species of Pseudothelphusidae of three genera, representing 53% of the 15 pseudothelphusid crab species currently recorded from Costa Rica. The most common species was Ptychophallus paraxanthusi followed by P. tristani. Freshwater crabs were more frequently encountered in the middle-low region of the basin (between 311 and 600 m and less frequently in the medium-high basin (between 601 and 1,225 m. Ptychophallus paraxanthusi showed the widest distribution and was collected in altitudes ranging from 20 to 700 m. The Rio Grande de Térraba region can be considered as a relatively small, but highly diverse system. Therefore, any alteration of the basin of Rio Grande de Térraba, and especially the possible construction of a hydroelectric power plant, needs to be carefully analyzed to mitigate the damaging effects of this project on the freshwater crabs. More ecological information about freshwater crabs from Costa Rica and the Central American region are needed to reach a first reasonable overview on the ecological role of these decapods in freshwater systems.

  8. The tropical African hermit crab Pagurus mbizi (Crustacea, Decapoda, Paguridae in the Western Mediterranean Sea: a new alien species or filling gaps in the knowledge of the distribution?

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    J. E. GARCIA RASO

    2013-12-01

    Full Text Available We report the first occurrence in the European Mediterranean Sea of a tropical Atlantic hermit crab, Pagurus mbizi (Forest, 1955, based on the capture of twenty specimens (all sizes and ovigerous females collected along the northern shores of the Alboran Sea, which proof the existence of a well-established population of this species, and the importance of this geographic area as a transitional and settlement zone for Atlantic species, which makes the Alboran Sea one of the richest marine biodiversity areas in the Mediterranean Sea. Some morphological comparative data with the closely related hermit crab Pagurus pubescentulus are given. In addition, data on its habitat and geographical distribution, as well as the probable pathways of introduction, are commented.

  9. Provisional revision of American snapping shrimp allied to Alpheus floridanus Kingsley, 1878 (Crustacea: Decapoda: Alpheidae) with notes on A. floridanus africanus.

    Science.gov (United States)

    Bracken-Grissom, Heather D; Felder, Darryl L

    2014-12-17

    Alpheus floridanus Kingsley, 1878 has been previously treated as a single, morphologically diverse species with a broad distribution in the eastern and western Atlantic Ocean and eastern Pacific Ocean. However, variations in morphology and color patterns, in addition to genetic evidence, have prompted futher investigation. Morphological characters, including curvature and length of the scaphocerite, number teeth on the incisor process of the mandible, number of pereopodal spines, proportions of the major chela, as well as color patterns, support recognition of several species in the Alpheus floridanus complex. Alpheus floridanus sensu stricto (s.s.) is redescribed based upon a lectotype selected from the former syntypic pair. The mutilated second specimen of the syntypic pair is identified as A. platycheirus Boone, 1927, which is fully redescribed. Three species are described as new: A. hephaestus sp. nov. from the eastern Pacific, and A. roblesi sp. nov. and A. ulalae sp. nov. from the western Atlantic. Morphological comparisions to the eastern Atlantic A. floridanus africanus Balss, 1916 are discussed, however a formal treatment of this subspecies is not the objective of this study. Our proposed taxonomic revisions of the A. floridanus complex are supported in a companion molecular genetic analysis (following paper, this volume). 

  10. In situ observations on the habitat and abundance of the squat lobster Gastroptychus perarmatus (Haig, 1968 (Crustacea: Decapoda: Chirostylidae in the n orthern Gulf of California, Mexico

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    M.E. Hendrickx

    2013-12-01

    Full Text Available Living specimens of Gastroptychus perarmatus (Haig, 1968, a chirostylid squat lobster, were observed on colonies of gorgonian corals and sponges in the northern Gulf of California. Video footage and photographs obtained from the Remotely Operated Vehicle JASON dive north of Angel de La Guarda Island in the northern Gulf of California indicate that this squat lobster lives on coral specimens of Callogorgia, probably C. flabellum (Ehrenberg, 1834, and on one or two unidentified species of sponge(s. Seven sites were observed to contain G. perarmatus with the number of individuals per host varying from 2 to 11. No specimens were observed on the sea floor away from a host. Review of videos indicates that most individuals of G. perarmatus observed remained motionless in the same position throughout the video recording period (max. 30 seconds, with the body erect and the chelipeds extended, presumably to facilitate collection of organic particles transported by the current. At one site, however, the video shows one adult specimen grasping large particles of floating debris retained on the gorgonian. Until recently there were no records of G. perarmatus since it was described from California in depths of 229m (north of Anacapa Island. A few specimens were accidentally captured in a benthic sledge in the northern Gulf of California in 2011. This is a new record for the area, including a new maximum depth record (705-710 m for the species. This rare species of squat lobster and its host the gorgonian coral would be subject to severe environmental impacts if fishing or mining activities were developed in the area.

  11. First record of Clausidium (Copepoda, Clausidiidae from Brazil: a new species associated with ghost shrimps Neocallichirus grandimana (Gibbes, 1850 (Decapoda, Callianassidae

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    Terue Kihara

    2013-09-01

    Full Text Available A new clausidiid copepod was found living in galleries of ghost shrimps Neocallichirus grandimana (Gibbes, 1850 in Natal, Brazil. The new species resembles to Clausidium senegalense Humes, 1957 and C. vancouverense (Haddon, 1912 in the armature of P2–P5 of the female, and shares with C. senegalense similar segmentation and armature of the antenna and maxilla of the female. Nevertheless, it can be easily distinguished from its congeners by the unique characteristics observed in the antenna, maxilliped and first leg of males, as well as by the anal somite, maxillule and maxilliped of the females. This new species extends the group distribution to the Southwest Atlantic and represents the first record of the genus in Brazil. A key for the identification of the species based on females of Clausidium is provided.

  12. Ecological distribution of the shrimp camarao serrinha Artemesia longinaris (Decapoda, Penaeidae) in Fortaleza bay, Ubatuba, Brazil, in relation to abiotic factors

    OpenAIRE

    Fransozo, A.; Costa, R.C.; Castilho, A.L.; Mantelatto, F.L.

    2004-01-01

    The spatial and temporal distribution of the shrimp Artemesia longinaris in Fortaleza Bay, northern coast of Sao Paulo State, Brazil, in relation to abiotic factors, was studied. Shrimp samples were obtained on a monthly basis from November 1988 through October 1989 at seven pre-delimited transects on board of a fishing vessel supplied with double otter trawl nets. Depth was recorded at the midpoint of each transect; water and sediment samples were taken to measure salinity, temperature, text...

  13. First record of Clausidium (Copepoda, Clausidiidae) from Brazil: a new species associated with ghost shrimps Neocallichirus grandimana (Gibbes, 1850) (Decapoda, Callianassidae).

    Science.gov (United States)

    Kihara, Terue C; Rocha, Carlos E F

    2013-01-01

    A new clausidiid copepod was found living in galleries of ghost shrimps Neocallichirus grandimana (Gibbes, 1850) in Natal, Brazil. The new species resembles to Clausidium senegalense Humes, 1957 and Clausidium vancouverense (Haddon, 1912) in the armature of P2-P5 of the female, and shares with Clausidium senegalense similar segmentation and armature of the antenna and maxilla of the female. Nevertheless, it can be easily distinguished from its congeners by the unique characteristics observed in the antenna, maxilliped and first leg of males, as well as by the anal somite, maxillule and maxilliped of the females. This new species extends the group distribution to the Southwest Atlantic and represents the first record of the genus in Brazil. A key for the identification of the species based on females of Clausidium is provided.

  14. Molecular and morphological differentiation between two Miocene-divergent lineages of Amazonian shrimps, with the description of a new species ( Decapoda , Palaemonidae , Palaemon )

    OpenAIRE

    Fabrício Carvalho; Célio Magalhães; Fernando Mantelatto

    2014-01-01

    Abstract Palaemon carteri (Gordon, 1935) and Palaemon ivonicus (Holthuis, 1950) are morphologically similar species of South American freshwater shrimps. Past studies have questioned the taxonomic status of both species, which are supposed to have partially sympatric geographic distributions in the Amazon basin. We analyzed a 550 bp fragment of the mitochondrial 16S rRNA gene from these Amazonian Palaemon species as well as from 11 palaemonids as the outgroup. Additionally, we checked diagnos...

  15. First record of Clausidium (Copepoda, Clausidiidae) from Brazil: a new species associated with ghost shrimps Neocallichirus grandimana (Gibbes, 1850) (Decapoda, Callianassidae)

    OpenAIRE

    Terue Kihara; Carlos Da Rocha

    2013-01-01

    Abstract A new clausidiid copepod was found living in galleries of ghost shrimps Neocallichirus grandimana (Gibbes, 1850) in Natal, Brazil. The new species resembles to Clausidium senegalense Humes, 1957 and Clausidium vancouverense (Haddon, 1912) in the armature of P2–P5 of the female, and shares with Clausidium senegalense similar segmentation and armature of the antenna and maxilla of the female. Nevertheless, it can be easily distinguished from its congeners by the unique characteristics ...

  16. Inferring population connectivity across the range of distribution of the stiletto shrimp Artemesialonginaris Spence Bate, 1888 (Decapoda, Penaeidae) from DNA barcoding: implications for fishery management.

    Science.gov (United States)

    Carvalho-Batista, Abner; Negri, Mariana; Pileggi, Leonardo G; Castilho, Antonio L; Costa, Rogério C; Mantelatto, Fernando L

    2014-01-01

    Artemesialonginaris is a marine shrimp endemic to the southwestern Atlantic and distributed from Atafona, Rio de Janeiro (Brazil) to Rawson, Chubut (Argentina). In recent years, this species has become an important target of the commercial fishery as a consequence of the decline in the fishery of more traditional and profitable marine shrimps. In addition, phenotypic variations have been documented in populations along its distribution. Therefore, investigations on the genetics of the fishing stocks are necessary for the development of sustainable management strategies and for understanding the possible sources of these variations. The mitochondrial gene Cytochrome Oxidase I (COI) was used to search for evidence of genetic structure among the populations of Artemesialonginaris and to analyze the phylogenetic relationships among them. A total of 60 specimens were collected from seven different localities, covering its geographical range. The final alignment showed 53 haplotypes (48 individuals and 5 shared), with no biogeographical pattern. The low genetic divergence found, with a non-significant FST value, also suggests the absence of population structure for this gene. These findings indicate a continuous gene flow among the populations analyzed, suggesting that the phenotypic variation is a consequence of different environmental conditions among the localities.

  17. First record of marine crab, Eucrate alcocki Serne, in Serène and Lohavanijaya, 1973 (Crustacea, Decapoda, Brachyura, Euryplacidae) from India

    Institute of Scientific and Technical Information of China (English)

    M. RAJKUMAR; K. P. KUMARAGURU VASAGAM; LI Xinzheng; SUN Jun

    2009-01-01

    This paper reports the occurrence of a marine brachyuran crab species Eucrate alcocki Serène, in Serène et al., 1973, of the family Euryplacidae Stimpson, 1871, for first time from India, based on a male specimen from Parangipettai fish landing centre in Bay of Bengal, Southeast Coast of India. Although morphologically corresponding with what is currently defined as E. alcocki, the color pattern of the carapace of the present specimen is rather different from that of the Chinese material-only the anterior fifth of the carapace is marked with scattered red spots, the rest of the surface is yellowish, with four unusually shaped red blotches which almost look like Sanskrit characters.

  18. Genetic diversity within and between broodstocks of the white shrimp Litopenaeus vannamei (Boone, 1931 (Decapoda, Penaeidae and its implication for the gene pool conservation

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    PD. Freitas

    Full Text Available Genetic variation within and between fifteen closed broodstock lines of the Pacific white shrimp Litopenaeus vannamei, reared at different hatcheries in the Brazilian coast, was assessed by RAPD analysis. Fifty two polymorphic loci were identified when a set of five decamer primers was used in PCR. The genetic diversity analysis within lines evidenced genetic variation loss probably related to bottleneck effects and inbreeding. In addition, the genetic divergence values between the different samples appear to reflect the initial founder composition of such stocks, in some cases, sharing a common origin, suggesting a putative importance of interbreeding for the establishment of genetic improvement programs for these broodstocks. The genetic variation monitoring appears to be helpful to the gene pool conservation of this aquaculture species, mainly if considered its exotic status in Brazil and the current impossibility of new introduction of wild individuals.

  19. Further observations on zooplankton of the Potengi Estuary (Natal, Rio Grande do Norte, Brazil with special reference to the larvae of Brachyura (Crustacea, Decapoda

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    C Sankarankutty

    1995-01-01

    Full Text Available The present paper deals with data on zooplankton collected from the estuary of Potengi, Natal, Rio Grande do Norte, Brazil covering a period of one year from October 1992 to October 1993. Three fixed stations within the estuary located at varying distances from the mouth of the river were sampled. Sampling was done monthly when the tide was lowest. Analysis of the samples has shown clear pattern of seasonal variations in abundance of the dominant zooplankton components which are composed of Copepoda, Appendicularia, larvae of Brachyura, larvae of Cirripedia and Chaetognalha. A detailed study of the larvae of Brachyura was also attempted which showed that seven species can be identified in the samples, of which those of Aratus pisonii (H. Milne Edwards and Cardisoma guanhumi Latreille have already been described. Other five species are designated here numerically and description of various stages present in the samples are given.

  20. Redescription of Potamonautes sidneyi (Rathbun, 1904) (Decapoda, Potamonautidae) and description of a new congeneric species from KwaZulu-Natal, South Africa

    Science.gov (United States)

    Peer, Nasreen; Gouws, Gavin; Lazo-Wasem, Eric; Perissinotto, Renzo; Miranda, Nelson A.F.

    2017-01-01

    Abstract A new species of freshwater crab, Potamonautes danielsi sp. n., is described from the southern region of the KwaZulu-Natal Province, South Africa. Potamonautes danielsi most closely resembles Potamonautes sidneyi which is re-described here, but can be distinguished by a suite of key morphological characters including carapace shape and width, slim pereopods, inflated propodi of the chelipeds, and the shape and terminal segment length:subterminal segment length ratio of the 1st gonopod. In a previous study (Gouws et al. 2015), a 9.2–11.8 % divergence was found in the mitochondrial COI and 16S genes of the Potamonautes sidneyi clade, allowing for the delineation of a new species. Despite the clear molecular distinction between the two species, it is difficult to separate them based on individual morphological characters, as there is a great deal of overlap even among key features. The new species is found in slow-moving mountain streams and pools at high altitudes between Umhlanga and Mtamvuna, in KwaZulu-Natal.

  1. Shell occupation by the hermit crab Dardanus insignis (Decapoda, Diogenidae from the north Coast of São Paulo state, Brazil

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    I. F. Frameschi

    Full Text Available Abstract The pattern of shell occupation by the hermit crab Dardanus insignis (Saussure, 1858 from the subtropical region of southeastern coast of Brazil was investigated in the present study. The percentage of shell types that were occupied and the morphometric relationships between hermit crabs and occupied shells were analyzed from monthly collections conducted during two years (from January 1998 to December 1999. Individuals were categorized according to sex and gonadal maturation, weighed and measured with respect to their cephalothoracic shield length (CSL and wet weight (CWW. Shells were measured regarding their aperture width (SAW, dry weight (SDW and internal volume (SIV. A total of 1086 hermit crabs was collected, occupying shells of 11 gastropod species. Olivancillaria urceus (Roding, 1798 was most commonly used by the hermit crab D. insignis, followed by Buccinanops cochlidium (Dillwyn, 1817, and Stramonita haemastoma (Linnaeus, 1767. The highest determination coefficients (r2 > 0.50, p < 0.01 were recorded particularly in the morphometric relationships between CSL vs. CWW and SAW vs. SIV, which are important indication that in this D. insignis population the great majority the animals occupied adequate shells during the two years analysed. The high number of used shell species and relative plasticity in pattern of shell utilization by smaller individuals of D. insignis indicated that occupation is influenced by the shell availability, while larger individuals demonstrated more specialized occupation in Tonna galea (Linnaeus, 1758 shell.

  2. Preliminary survey of a nemertean crab egg predator, Carcinonemertes, on its host crab, Callinectes arcuatus (Decapoda, Portunidae) from Golfo de Nicoya, Pacific Costa Rica

    Science.gov (United States)

    Okazaki, Robert K.; Wehrtmann, Ingo S.

    2014-01-01

    Abstract The possible presence of egg predators in brood masses of portunid crabs from Pacific Central America has not been studied yet. This survey reports the finding of a nemertean crab egg predator on the portunid crab, Callinectes arcuatus, from the Golfo de Nicoya, Pacific Costa Rica. Nemerteans were found in the egg masses of 26 out of the 74 crabs for a prevalence of 35%. The intensity (mean number of worms/ infected crab) was estimated to be 18 with a variance of 1–123 worms/infected crab. No nemerteans were observed either in the 19 Callinectes arcuatus from Golfo Dulce (southern Pacific coast) and the 10 Portunus asper from Herradura-Jaco (central Pacific coast). This nemertean is a member of the genus Carcinonemertes, which has been reported from the Caribbean coast of Panama. However, the encountered Carcinonemertes sp. is the first published finding and report from Costa Rica and Pacific Central America. PMID:25561848

  3. Systematic status of the caridean families Gnathophyllidae Dana and Hymenoceridae Ortmann (Crustacea: Decapoda): a further examination based on molecular and morphological data

    Science.gov (United States)

    Gan, Zhibin; Li, Xinzheng; Kou, Qi; Chan, Tinyam; Chu, Kahou; Huang, Hui

    2015-01-01

    The four palaemonoid (sub)families Anchistioididae, Gnathophyllidae, Hymenoceridae, and Pontoniinae are similar in morphology, and all live in marine habitats. Their systematic relationships are controversial. In this study, we used sequences from a mitochondrial ribosomal gene (16S rRNA) and three nuclear genes (H3, NaK, and enolase) to explore the phylogenetic relationships of these four taxa. Our tree based on 43 species belonging to 28 genera shows that Gnathophyllidae and Hymenoceridae are nested within Pontoniinae. This result is consistent with evidence from larval morphology. The defining characteristics of Gnathophyllidae and Hymenoceridae, a vestigial or missing mandibular incisor process and a broadened third maxilliped, can also be found in Pontoniinae; conversely, on the basis of published species descriptions, gnathophyllids and hymenocerids meet most of the defining characteristics of Pontoniinae. The peculiar form of the third maxilliped in gnathophyllids and hymenocerids might be the result of adaptive evolution, as these particular features are also present in pontoniines. According to our phylogenetic tree, Anchistioididae are more remote from Pontoniinae, which is consistent with the distinct morphological differences in the pleopods. The pontoniine genera analyzed (together with Gnathophyllidae and Hymenoceridae) are divided into two clades. The members of Clade I exhibit primordial characteristics similar to those of the Palaemoninae, and might be direct descendants of the ancestor of the Pontoniinae; members of Clade II are more specialized.

  4. Morphological variation of freshwater crabs Zilchiopsis collastinensis and Trichodactylus borellianus (Decapoda, Trichodactylidae among localities from the middle Paraná River basin during different hydrological periods

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    María Victoria Torres

    2014-11-01

    Full Text Available Measures of hydrologic connectivity have been used extensively to describe spatial connections in riverine landscapes. Hydrologic fluctuations constitute an important macrofactor that regulates other environmental variables and can explain the distribution and abundance of organisms. We analysed morphological variations among individuals of two freshwater crab species, Zilchiopsis collastinensis and Trichodactylus borellianus, from localities of the middle Paraná River basin during two phases of the local hydrological regime. Specimens were sampled at sites (localities of Paraná River, Saladillo Stream, Salado River and Coronda River when water levels were falling and rising. The conductivity, pH, temperature and geographical coordinates were recorded at each site. The dorsal cephalothorax of each crab was represented using 16 landmarks for Z. collastinensis and 14 landmarks for T. borellianus. The Canonical Variate Analyses showed differences in shape (for both species among the crabs collected from the Paraná and Salado Rivers during the two hydrologic phases. We did not find a general distribution pattern for shape among the crab localities. During falling water, the shapes of Z. collastinensis were not related to latitude-longitude gradient (i.e., showing greater overlap in shape, while during rising water the shapes were ordered along a distributional gradient according to geographical location. Contrary, shapes of T. borellianus were related to latitude-longitude during falling water and were not related to distributional gradient during rising water. The cephalothorax shape showed, in general, no statistically significant covariations with environmental variables for either species. These results show that each freshwater crab species, from different localities of the middle Paraná River, remain connected; however, these connections change throughout the hydrologic regime of the floodplain system. This study was useful for delineating how the relation among shapes of crabs of localities varies during two phases of the hydrological regime and for estimating the connections and geographical patterns in the floodplain system.

  5. Larval development of Cyrtograpsus affinis (Dana (Decapoda, Brachyura, Varunidae from Río de la Plata estuary, reared in the laboratory

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    Eduardo D. Spivak

    2000-03-01

    Full Text Available The complete larval development of the crab Cyrtograpsus affinis (Brachyura, Varunidae was obtained by culture in the laboratory. Five zoeal stages, the megalopa and the first crab are described and illustrated. Larval development from hatching to first crab took 29 days at 20° C and 35 PSU. The genus Cyrtograpsus only consists of three species. Larval development of C. altimanus and C. angulatus had been described previously. In the present study, morphological larval characters of the three species are compared. Generic larval features are also compared with those of other Varunidae genera.

  6. The larval development of Pilumnoides hassleri (Decapoda: Brachyura: Pilumnoididae reared in the laboratory, with a review of pilumnoidid systematics using larval characters

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    Tomás A. Luppi

    2010-03-01

    Full Text Available The genus Pilumnoides is an interesting taxon because its systematic position, based on adult characters, remains unclear. These xanthoid crabs have been related to the Carpiliidae, Goneplacidae and Eriphioidea. P. hassleri A. Milne Edwards, 1880 lives in Brazilian, Uruguayan and Argentinian coasts as far south as the Magellan Strait (southwestern Atlantic. Larvae of P. hassleri from females collected in the harbour of Mar del Plata were reared in the laboratory from zoea I to megalopa and the first larval stage, and described. The species passed through 5 zoeal stages and a megalopa. Larval characters were compared with the previous description of larvae from the southeastern Pacific species P. perlatus and with species of Carpilius, Goneplax and Eriphia in order to review the relationships between these taxa.

  7. Calyptraeotheres sp. nov. (Crustacea: Decapoda: Pinnotheridae), symbiont of the slipper shell Crepidula striolata Menke, 1851 (Mollusca: Gastropoda: Calyptraeidae) from the Gulf of California, Mexico.

    Science.gov (United States)

    Ayón-Parente, Manuel; Hendrickx, Michel E

    2014-10-07

    Calyptraeotheres camposi sp. nov. is described from the Gulf of California, Mexico. The new species is close to C. granti (Glassell, 1933) and C. pepeluisi Campos & Hernández-Ávila, 2010 from the Mexican Pacific and to C. hernandezi Hernández-Ávila & Campos 2006 from the Western Atlantic. These four species feature a third maxilliped with a 2-segmented endopod palp and the exopod with unsegmented flagellum. Calyptraeotheres camposi sp. nov. differs from C. granti and C. hernandezi by having the eyes visible in dorsal view, the carapace with arcuate anterolateral margins, the dorsal, longitudinal depressions connected with the transversal depression, and the propodus of pereiopod 2 equal or slightly longer than the carpus. From C. pepeluisi it is distinguished by the absence of a transversal depression on the carapace and the longitudinal depressions not connecting, the carpus and propodus of the third maxilliped being sub-trapezoidal and sub-conical, respectively, in lieu of subrectangular, and the inner surface of the fixed finger nude instead of bearing short setae near the cutting edge and ventral margin.

  8. Comparative Reproduction Aspects of the Deep-water Shrimps Aristaeomorpha foliacea and Aristeus antennatus (Decapoda, Aristeidae in the Greek Ionian Sea (Eastern Mediterranean

    Directory of Open Access Journals (Sweden)

    K. Kapiris

    2009-01-01

    Full Text Available In the eastern Ionian Sea, the deep-water shrimps Aristaeomorpha foliacea and Aristeus antennatus constitute a virgin fishing resource, since their maximum abundance depth exceeds commercial exploitation depths. The two sympatric species share a number of common reproductive features, such as summer reproduction. A slight temporal shift in mating activity, ovarian maturation, and spawning period was observed between species. The most notable difference was the more pronounced seasonality in reproductive activity of Aristeus antennatus compared to that of A. foliacea as evidenced by the frequency of inseminated females and functionally mature males, as well as by the shorter ovarian maturation period. Nevertheless, regarding the whole life span, both sexes of Aristeus antennatus exhibit a more extended reproductive activity in comparison to A. foliacea. No notable differentiation of both species existed in comparison to other Mediterranean regions.

  9. The alien, parthenogenetic marbled crayfish (Decapoda: Cambaridae is entering Kis-Balaton (Hungary, one of Europe’s most important wetland biotopes

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    Lőkkös Andor

    2016-01-01

    Full Text Available The marbled crayfish or Marmorkrebs, Procambarus fallax (Hagen, 1870 f. virginalis, a parthenogenetic freshwater crayfish belonging to the North American cambarids, was recorded in Hungary for the first time. Several specimens of this potentially invasive crayfish were caught at different locations in the thermal Lake Hévíz and its outflows in the western part of the country. Captured individuals covered a wide size range (5.5 to 50.5 mm carapace length and one was carrying eggs and recently hatched offspring, which suggests that this organism has established a stable and self-sustaining population in the warm habitats of Lake Hévíz area. This finding is of great significance because these habitats belong to the catchment of the Danube River including Lake Balaton, and thus, a significant further spread of the marbled crayfish is likely to happen in Central Europe. Furthermore, the expansion of this crayfish already reached the Kis-Balaton, one of the landscape protection areas of the Balaton Uplands National Park, what could have currently yet unpredictable consequences for this unique wetland biotope.

  10. Shrimps of the crangonid genus Paracrangon Dana (Crustacea: Decapoda: Caridea from the northwestern Pacific: taxonomic review and description of a new species from Japan

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    Tomoyuki Komai

    2004-12-01

    Full Text Available The northwestern Pacific species of the crangonid genus Paracrangon Dana, 1852 are reviewed. Five species, including one new species, are recognised from the region: P. echinata Dana, 1852 (type species of the genus, P. abei Kubo, 1937, P. furcata Kubo, 1937, P. okutanii Ohé and Takeda, 1986, and P. ostlingos sp. nov. The geographical range of P. okutanii is extended to the northern South China Sea off southwestern Taiwan, representing the first discovery of species of the genus from tropical waters in the western Pacific. These species are diagnosed and illustrated. They are classified into two informal species groups, the P. echinata species group (including P. echinata, P. abei and P. okutanii, and two species from other regions, P. areolata Faxon, 1893 and P. australis Hanamura, Wadley and Taylor, 1999 and the P. furcata species group (P. furcata and P. ostlingos sp. nov.. New findings on the morphology of the genus are presented. The monophyly of Paracrangon is highly corroborated by a number of autapomorphic characters, but its relationship to other crangonid genera remains obscure. A revised key to aid in the identification of the species of Paracrangon is presented.

  11. A new species of the genus Petrolisthes Stimpson (Crustacea, Decapoda, Porcellanidae) from the Central Pacific, with remarks and new records for P. aegyptiacus Werding & Hiller

    Science.gov (United States)

    Hiller, Alexandra; Werding, Bernd

    2016-01-01

    Abstract Petrolisthes paulayi sp. n. is described from specimens collected in French Polynesia. The new species belongs to an assemblage of morphologically similar Indo-West Pacific (IWP) species, here designated as the “mesobranchial-spine group”. All species in the group bear carapace spines, including one or more mesobranchial spines, and transverse, piliferous striations on the dorsal surface of carapace and chelipeds. Petrolisthes paulayi sp. n. is distinguishable from all species in the group by its forwardly produced, trilobate front, and a characteristic combination of carapace spines. We also report on the range extension and live coloration of Petrolisthes aegyptiacus Werding & Hiller, another species of the mesobranchial-spine group, so far considered a Red Sea endemic. Specimens from the Mascaréne Islands confirm that the geographic range of the species extends to the southern Indian Ocean. While specimens morphologically similar to Petrolisthes aegyptiacus, and collected in the Line and Society Islands, suggest a large range extension to the Central Pacific, it is probable that these individuals represent an undescribed species closely related to Petrolisthes aegyptiacus. PMID:27667952

  12. Function and functional groupings of the complex mouth apparatus of the squat lobsters Munida sarsi Huus and M. tenuimana G.O. Sars (Crustacea: Decapoda)

    DEFF Research Database (Denmark)

    Garm, A; Høeg, J T

    2001-01-01

    Like all other decapods, the anomuran squat lobsters Munida sarsi and M. tenuimana have a mouth apparatus composed of six pairs of mouthparts plus labrum and paragnaths (upper and lower lips). To study the functional significance of this complexity, we examined the mouthparts with scanning electron...

  13. Seismic air gun exposure during early-stage embryonic development does not negatively affect spiny lobster Jasus edwardsii larvae (Decapoda: Palinuridae).

    Science.gov (United States)

    Day, Ryan D; McCauley, Robert D; Fitzgibbon, Quinn P; Semmens, Jayson M

    2016-03-07

    Marine seismic surveys are used to explore for sub-seafloor oil and gas deposits. These surveys are conducted using air guns, which release compressed air to create intense sound impulses, which are repeated around every 8-12 seconds and can travel large distances in the water column. Considering the ubiquitous worldwide distribution of seismic surveys, the potential impact of exposure on marine invertebrates is poorly understood. In this study, egg-bearing female spiny lobsters (Jasus edwardsii) were exposed to signals from three air gun configurations, all of which exceeded sound exposure levels (SEL) of 185 dB re 1 μPa(2) · s. Lobsters were maintained until their eggs hatched and the larvae were then counted for fecundity, assessed for abnormal morphology using measurements of larval length and width, tested for larval competency using an established activity test and measured for energy content. Overall there were no differences in the quantity or quality of hatched larvae, indicating that the condition and development of spiny lobster embryos were not adversely affected by air gun exposure. These results suggest that embryonic spiny lobster are resilient to air gun signals and highlight the caution necessary in extrapolating results from the laboratory to real world scenarios or across life history stages.

  14. Characterization of a novel nm23 gene and its potential roles in gametogenesis in the prawn Macrobrachium rosenbergii (de Man, 1879) (Crustacea: Decapoda).

    Science.gov (United States)

    Song, Ya-Nan; Lu, Cui-Yun; Chen, Jie; Qiu, Gao-Feng

    2013-11-15

    Nm23 is a family of genes encoding the nucleoside diphosphate (NDP) kinase, which functions in a wide variety of biological processes, including growth, development, differentiation and tumor metastasis. In this study, a novel nm23 gene, designated as Mrnm23, was identified from the freshwater giant prawn Macrobrachium rosenbergii. The full-length cDNA was 776bp in length, encoding for a protein of 176 amino acids with one typical NDP kinase domain that harbored all the crucial residues for nucleotide binding and enzymatic activity. Like human novel nm23-H1B, the putative protein contained a unique 21-amino-acid NH2-terminal extension as compared to human nm23 (nm23-H1) homologs. Further, 3 extra amino acid residues prolonged the COOH-terminus. The Mrnm23 was ubiquitously expressed in all tissues examined, including androgenic gland, gill, heart, liver, muscle, ovary, and testis. In situ hybridization to gonad sections indicated that the Mrnm23 mRNA was localized in the cytoplasm of cup-base of differentiating spermatids, in the spike of the umbrella-shaped spermatozoa and in the cytoplasm of the early previtellogenic oocytes, suggesting that the Mrnm23 has potential roles in spermiogenesis and early differentiation of oocyte.

  15. The history of the introduction of the giant river prawn, Macrobrachium cf. rosenbergii (Decapoda, Palaemonidae, in Brazil: new insights from molecular data

    Directory of Open Access Journals (Sweden)

    Gabriel Iketani

    2011-01-01

    Full Text Available The giant river prawn, Macrobrachium cf. rosenbergii, is one of the most cultivated freshwater prawns in the world and has been introduced into more than 40 countries. In some countries, this prawn is considered an invasive species that requires close monitoring. Recent changes in the taxonomy of this species (separation of M. rosenbergii and M. dacqueti require a re-evaluation of introduced taxa. In this work, molecular analyses were used to determine which of these two species was introduced into Brazil and to establish the geographic origin of the introduced populations that have invaded Amazonian coastal waters. The species introduced into Brazil was M. dacqueti through two introduction events involving prawns originating from Vietnam and either Bangladesh or Thailand. These origins differ from historical reports of the introductions and underline the need to confirm the origin of other exotic populations around the world. The invading populations in Amazonia require monitoring not only because the biodiversity of this region may be affected by the introduction, but also because admixture of different native haplotypes can increase the genetic variability and the likelihood of persistence of the invading species in new habitats.

  16. 罗氏沼虾脑的形态和结构%The Morphology and Structure of the Brain of the Prawn,Macrobrachium rosenbergii ( Crustacea : Decapoda)

    Institute of Scientific and Technical Information of China (English)

    廖家遗

    2001-01-01

    罗氏沼虾(Macrobrachium rosenbergii)的脑位于两个眼柄基部中的一团海绵状组织内.它由神经根、前脑、中脑、后脑、神经连接和细胞体群组成.它的神经根从脑发出的位置及外伸的方向和已描述过的虾、蟹的脑神经根有一定的区别,未发现有副叶髓质和中脑连接.因此它可能是虾蟹另一种脑的类型.%The brain of the prawn Macrobrachium rosenbergii is located in a mass of spongy tissue within the base of eyestalks. It consists of protocerebrum, deutocerebrum, tritocerebrum, nerve roots, commissures, and clusters of cell bodies. It is different from the described brains of the other prawn and crabs in the site where the nerve roots project from the brain and in the extension directions of the nerve roots. In the brain the accessory lobe, a neuropil, and the deutocerebral commissure could not be identified. The above differences suggest that the brain of Macrobrachium rosenbergii may be a new brain type of the prawns and crabs.

  17. The history of the introduction of the giant river prawn, Macrobrachium cf. rosenbergii (Decapoda, Palaemonidae), in Brazil: New insights from molecular data.

    Science.gov (United States)

    Iketani, Gabriel; Pimentel, Luciana; Silva-Oliveira, Glaúcia; Maciel, Cristiana; Valenti, Wagner; Schneider, Horacio; Sampaio, Iracilda

    2011-01-01

    The giant river prawn, Macrobrachium cf. rosenbergii, is one of the most cultivated freshwater prawns in the world and has been introduced into more than 40 countries. In some countries, this prawn is considered an invasive species that requires close monitoring. Recent changes in the taxonomy of this species (separation of M. rosenbergii and M. dacqueti) require a re-evaluation of introduced taxa. In this work, molecular analyses were used to determine which of these two species was introduced into Brazil and to establish the geographic origin of the introduced populations that have invaded Amazonian coastal waters. The species introduced into Brazil was M. dacqueti through two introduction events involving prawns originating from Vietnam and either Bangladesh or Thailand. These origins differ from historical reports of the introductions and underline the need to confirm the origin of other exotic populations around the world. The invading populations in Amazonia require monitoring not only because the biodiversity of this region may be affected by the introduction, but also because admixture of different native haplotypes can increase the genetic variability and the likelihood of persistence of the invading species in new habitats.

  18. Research on the river shrimps of the genus Macrobrachium (Bate, 1868 (Decapoda: Caridea: Palaemonidae with known or potential economic importance: strengths and weaknesses shown through scientometrics

    Directory of Open Access Journals (Sweden)

    Olimpia Chong-Carrillo

    2015-09-01

    Full Text Available This study revealed that the scientific interest in the genus Macrobrachium was not restricted to a biological point of view, but included also social and economic aspects. Many species of the genus are subject of traditional fisheries and culture worldwide. Several research groups across the globe have developed projects in various subject areas on commercial or non-commercial native species of this genus. This investigation aimed to contribute to the development of the genus Macrobrachium research through a scientometric study. The study was based on publications (1980 to 2013 registered in the following databases: Biological Abstracts, ISI Web of Science, SciELO Citation Index, BioOne, Science Direct, Scopus, and Redalyc. A total of 2165 publications on Macrobrachium in the last 33 years were included in this analysis. The themes that yielded most posts were related to culture, nutrition/feeding, and genetics with almost 60% of the total. Publications concerning M. rosenbergii represented more than 60% of the total with the remaining 40% encompassing 22 other species. Analysis performed by geographical regions evidenced that Latin America produced 23% of the publications, South Asia 22%, and East Asia 16%. Brazil generated 65% of the percentage mentioned for the Latin American region. It is necessary to strengthen research on topics of basic biology, especially those of native species. This will allow rapid progress in the generation of production technologies sustained by a solid biological knowledge base.

  19. Phylogenetic and transcriptomic analyses reveal the evolution of bioluminescence and light detection in marine deep-sea shrimps of the family Oplophoridae (Crustacea: Decapoda).

    Science.gov (United States)

    Wong, Juliet M; Pérez-Moreno, Jorge L; Chan, Tin-Yam; Frank, Tamara M; Bracken-Grissom, Heather D

    2015-02-01

    Bioluminescence is essential to the survival of many organisms, particularly in the deep sea where light is limited. Shrimp of the family Oplophoridae exhibit a remarkable mechanism of bioluminescence in the form of a secretion used for predatory defense. Three of the ten genera possess an additional mode of bioluminescence in the form of light-emitting organs called photophores. Phylogenetic analyses can be useful for tracing the evolution of bioluminescence, however, the few studies that have attempted to reconcile the relationships within Oplophoridae have generated trees with low-resolution. We present the most comprehensive phylogeny of Oplophoridae to date, with 90% genera coverage using seven genes (mitochondrial and nuclear) across 30 oplophorid species. We use our resulting topology to trace the evolution of bioluminescence within Oplophoridae. Previous studies have suggested that oplophorid visual systems may be tuned to differentiate the separate modes of bioluminescence. While all oplophorid shrimp possess a visual pigment sensitive to blue-green light, only those bearing photophores have an additional pigment sensitive to near-ultraviolet light. We attempt to characterize opsins, visual pigment proteins essential to light detection, in two photophore-bearing species (Systellaspis debilis and Oplophorus gracilirostris) and make inferences regarding their function and evolutionary significance.

  20. Larval stages of the deep-sea lobster Polycheles typhlops (Decapoda, Polychelida) identified by DNA analysis: morphology, systematic, distribution and ecology

    Science.gov (United States)

    Torres, Asvin P.; Palero, Ferran; Dos Santos, Antonina; Abelló, Pere; Blanco, Edurne; Boné, Alexandra; Guerao, Guillermo

    2014-09-01

    A total of 25 specimens of Eryoneicus larvae were collected near the Balearic Archipelago (Western Mediterranean Sea) in 2009 and 2010. Detailed morphological examination indicated that the smallest individual corresponded with the first zoea (ZI) stage of Polycheles typhlops hatched from a berried female by Guerao and Abelló (J Nat Hist 30(8):1179-1184, 1996). Only two species of deep-sea polychelid lobster, namely P. typhlops and Stereomastis sculpta, are known to occur in the Mediterranean. Genetic distance comparisons and phylogenetic analysis of the mitochondrial 16S rDNA and Cox I genes of this early larva together with adults from several Polycheles and Stereomastis species allowed us to assign it to P. typhlops. This is the first wild-caught larval stage of a polychelid lobster being identified using molecular techniques. The remaining specimens were attributed to zoeal stages II-III and decapodid stage based on morphological comparison. The arrangement of spines along the anterior part of the middorsal line (R, 1, 1, 1, 2, C1), characteristic of the former species E. puritanii, discriminates these larvae from other Eryoneicus found in the Mediterranean. The clear presence of epipods on the third maxilliped and pereiopods of the decapodid stage gives further support to the identification of E. puritanii as the larval stages of P. typhlops. Additionally, information on the ecology of these larvae, their abundances during different seasons, as well as their bathymetric distribution is reported.

  1. Zoological results of the British speleological expedition to Papua new Guinea 1975 : 7. Cavernicolous shrimps (Crustacea Decapoda, Natantia from new Ireland and the Philippines

    NARCIS (Netherlands)

    Holthuis, L.B.

    1978-01-01

    Through the kindness of Dr. P. Beron, National Natural History Museum, Sofia, Bulgaria, I was allowed to study some cavernicolous shrimps collected by him in New Ireland, while he was a member of the 1975 British Speleological Expedition to Papua New Guinea. The material proved to consist of two

  2. Feeding ecology of the freshwater crab Trichodactylus borellianus (Decapoda: Trichodactylidae in the floodplain of the Paraná River, southern South America

    Directory of Open Access Journals (Sweden)

    Verónica Williner

    2013-09-01

    Full Text Available Freshwater crabs are not commonly considered to be an important group in trophic webs, and this might be due to a lack of knowledge about their trophic roles in aquatic ecosystems. Trichodactylus borellianus is one of the most common and widely distributed freshwater crabs in the floodplains of the southern South American rivers. The main objective of the present study was to examine the trophic role of T. borellianus, in the floodplain of the Paraná River, and its relationships with the freshwater littoral community. The trophic spectrum of this species was characterized for both sexes and individuals of different sizes (adults and juveniles, throughout daily and seasonal cycles. Samples were collected from the aquatic vegetation of three shallow lakes. The diet composition and the feeding activity of T. borellianus were evaluated through the examination of the stomach contents and their degree of emptiness. This crab species consumed several plant and animal items, including amoebas, rotifers, oligochaetes, copepods, cladocerans, and insect larvae. Moreover, this species consumes filamentous and unicellular algae, diatoms, fungi, and macrophytic remains. The predatory habits varied with the season and time of day, and variations in the feeding activity of the juveniles and adults were detected and documented. The diversity of food items eaten by this crab suggests that its trophic role in the community as an omnivore and opportunistic predator provides a connection among several trophic levels from both aquatic and terrestrial communities.

  3. Size frequency distribution and growth of the crabs Callinectes arcuatus and C. bellicosus (Decapoda: Portunidae) in Las Guásimas coastal lagoon, Mexico

    National Research Council Canada - National Science Library

    Hernández, Luis; Arreola-Lizárraga, José Alfredo

    2007-01-01

    .... bellicosus is presented. The data comes from samples taken with a trawl net both day and night on a monthly basis from March 1998 to February 2000 in a coastal lagoon from Gulf of California. C. bellicosus (n=878...

  4. Crabs of the families Palicidae and Crossotonotidae (Crustacea, Decapoda, Brachyura, Palicoidea) from the Ogasawara Islands, Japan, with the description of a new species.

    Science.gov (United States)

    Takeda, Masatsune; Tachikawa, Hiroyuki

    2015-01-10

    Four species of palicoid crabs, Neopalicus jukesii (White, 1847) and Rectopalicus ampullatus Castro, 2000 of the family Palicidae, and Crossotonotus spinipes (De Man, 1888) and a new species of Pleurophricus A. Milne-Edwards, 1873 of the family Crossotonotidae, are recorded from the Ogasawara Islands, Japan. Diagnostics for the new species are the protruded bilobed front, six subacute lobate teeth at each lateral margin of the carapace, six rounded lobes at the posterior margin of the carapace, a crested armature of the cheliped carpus, and the strongly depressed ambulatory legs, which readily distinguish it from its two congeners, P. cristatipes A. Milne-Edwards, 1873 known by two males from Australia and the Kai Islands in Indonesia, and P. longirostris (Moosa & Serène, 1981) known by a female from the Sunda Strait, Indonesia.

  5. Population biology and distribution of the portunid crab Callinectes ornatus (Decapoda: Brachyura in an estuary-bay complex of southern Brazil

    Directory of Open Access Journals (Sweden)

    Timoteo T. Watanabe

    2014-08-01

    Full Text Available Trawl fisheries are associated with catches of swimming crabs, which are an important economic resource for commercial as well for small-scale fisheries. This study evaluated the population biology and distribution of the swimming crab Callinectes ornatus (Ordway, 1863 in the Estuary-Bay of São Vicente, state of São Paulo, Brazil. Crabs were collected from a shrimp fishing boat equipped with a semi-balloon otter-trawl net, on eight transects (four in the estuary and four in the bay from March 2007 through February 2008. Specimens caught were identified, sexed and measured. Samples of bottom water were collected and the temperature and salinity measured. A total of 618 crabs were captured (332 males, 267 females and 19 ovigerous females, with a sex ratio close to 1:1. A large number of juveniles were captured (77.67%. Crab spatial distributions were positively correlated with salinity (Rs = 0.73, p = 0.0395 and temperature (Rs = 0.71, p = 0.0092. Two peaks of recruitment occurred, in summer and autumn, and ovigerous females were mostly captured during summer, showing a seasonal reproductive pattern. The results showed that C. ornatus uses the bay as a nursery area for juvenile development. Callinectes ornatus is not yet a legally protected species, and the minimum allowed size of crabs caught in the area, although already restricted, should be carefully evaluated since the removal of large numbers of juveniles could negatively impact the local population.

  6. Two new potamid crabs, Yuexipotamon arcophallus new genus, new species and Minutomon shanweiense new genus, new species, (Crustacea: Decapoda: Brachyura: Potamidae) from southern China.

    Science.gov (United States)

    Huang, Chao; Mao, Si Ying

    2014-02-12

    Two new Chinese genera and species of freshwater crabs, Yuexipotamon arcophallus, new genus, new species, and Minutomon shanweiense, new genus, new species, are described from Zhaoqing City and Shanwei City, respectively. The former is superficially closest to Huananpotamon Dai & Ng, 1994, while the latter resembles Sinopotamon Bott, 1967, and Mediapotamon Dai, 1995. The two new genera, however, possess distinctive combinations of carapace, third maxilliped, male thoracic sternal and first gonopodal characters that easily distinguish them from other genera. Notes on the general biology of the two new species are also given.

  7. On one new genus and three new species of freshwater crabs (Crustacea: Decapoda: Brachyura: Potamidae and Grapsidae) from Lanjak-Entimau, Sarawak, East Malaysia, Borneo

    NARCIS (Netherlands)

    Ng, P.K.L.

    1995-01-01

    The freshwater crabs obtained from the Lanjak-Entimau area in Sarawak, East Malaysia, Borneo, are reported upon. One new genus (Ibanum) and two new species of Potamidae (Ibanum aethes and Isolapotamon stuebingi) and a new species of Grapsidae (Geosesarma katibas) are described. The identity of Potam

  8. Patterns of diversity, areas of endemism, and multiple glacial refuges for freshwater crabs of the genus Sinopotamon in China (Decapoda: Brachyura: Potamidae).

    Science.gov (United States)

    Fang, Fang; Sun, Hongying; Zhao, Qiang; Lin, Congtian; Sun, Yufang; Gao, Wei; Xu, Juanjuan; Zhou, Junying; Ge, Feng; Liu, Naifa

    2013-01-01

    Previous research has shown that the geographical distribution patterns of freshwater fishes and amphibians have been influenced by past climatic oscillations in China resulting from Pleistocene glacial activity. However, it remains unknown how these past changes have impacted the present-day distribution of Chinese freshwater crabs. This work describes the diversity and endemism of freshwater crabs belonging to Sinopotamon, a highly speciose genus endemic to China, and evaluates its distribution in terms of topography and past climatic fluctuations. Species diversity within Sinopotamon was found to be concentrated in an area from the northeastern edge of the Yunnan-Guizhou Plateau to the Jiangnan Hills, and three areas of endemism were identified. Multiple regression analysis between current climatic variables and Sinopotamon diversity suggested that regional annual precipitation, minimum temperature in the coldest month, and annual temperature range significantly influenced species diversity and may explain the diversity patterns of Sinopotamon. A comparison of ecological niche models (ENMs) between current conditions and the last glacial maximum (LGM) showed that suitable habitat for Sinopotamon in China severely contracted during the LGM. The coincidence of ENMs and the areas of endemism indicated that southeast of the Daba Mountains, and central and southeastern China, are potential Pleistocene refuges for Sinopotamon. The presence of multiple Pleistocene refuges within the range of this genus could further promote inter- and intraspecific differentiations, and may have led to high Sinopotamon species diversity, a high endemism rate and widespread distribution.

  9. Five new species of freshwater crabs of the genera Ghatiana Pati & Sharma, 2014, and Gubernatoriana Bott, 1970 (Crustacea, Decapoda, Brachyura: Gecarcinucidae Rathbun, 1904) from the Western Ghats, India.

    Science.gov (United States)

    Pati, S K; Thackeray, T; Khaire, A

    2016-02-23

    Five new species of gecarcinucid freshwater crabs, Ghatiana atropurpurea n. sp., Ghatiana splendida n. sp., Gubernatoriana alcocki Pati n. sp., Gubernatoriana thackerayi Pati n. sp., and Gubernatoriana waghi Pati n. sp. are described from the Western Ghats in Maharashtra and Goa states of India. Ghatiana atropurpurea n. sp. can be differentiated from other species of Ghatiana Pati & Sharma, 2014 by the shape and colour of its carapace, and the sigmoid-shaped male first pleopod (G1). Ghatiana splendida n. sp. is separated from its congeners mainly by its long anterolateral margin of the carapace and short terminal article of the G1. Besides, the colour pattern (deep pink carapace and chelipeds, orange ambulatory legs) of G. splendida n. sp. is exceptional among its congeners. Gubernatoriana alcocki n. sp. is unique among species of Gubernatoriana Bott, 1970 due to its inwardly curved tip of the terminal article of the G1. The stout and cone-shaped terminal article of the G1 of G. thackerayi n. sp. is characteristic among its congeners. In addition, G. thackerayi n. sp. has a unique colouration amongst congeners (violet-red carapace and ambulatory legs, orange-red chelipeds). Gubernatoriana waghi n. sp. can be distinguished from its congeners by the quadrate-shaped carapace, narrow frontal margin, pointed tips of the cheliped fingers, short terminal article of the G1 and very short or vestigial terminal article of the male second pleopod (G2). The body colour (burnt orange carapace and ivory coloured chelipeds and ambulatory legs) of G. waghi n. sp. is also important to distinguish live crabs of the genus. Key to the species of Ghatiana and Gubernatoriana is provided.

  10. Two new species of freshwater crabs of the genus Heterochelamon Türkay & Dai, 1997 (Crustacea: Decapoda: Brachyura: Potamidae) from Guangxi Zhuang Autonomous Region, southern China.

    Science.gov (United States)

    Naruse, Tohru; Zhu, Chunchao; Zhou, Xianmin

    2013-01-01

    Heterochelamon tessellatum n. sp. and H. castanea n. sp. are described trom the Guangxi Zhuang Autonomous Region, southern China. Heterochelamon tessellatum n. sp. and H. castanea n. sp. are morphologically most similar to H. yangshuoense Türkay & Dai, 1997, and H. guangxiense Türkay & Dai, 1997, respectively. The new species can be differentiated from these allied species by differences in the shape of external orbital tooth, epibranchial tooth, and male first gonopod. The present study brings the number of Heterochelamon species to five. A key to species of the genus Heterochelamon is provided.

  11. The land crabs of the Discoplax longipes A. Milne-Edwards, 1867 species group, with description of a new species from Guam (Crustacea: Decapoda: Brachyura: Gecarcinidae).

    Science.gov (United States)

    Ng, Peter K L; Shih, Hsi-Te

    2015-06-30

    Specimens of the gecarcinid land crab Discoplax longipes A. Milne-Edwards, 1867, from the western Pacific, can be separated into two distinct groups on the basis of DNA (mitochondrial 16S rDNA and cytochrome oxidase subunit I) and structure of the male first gonopod. On the basis of this data, the material that occurs from the Loyalty Islands to French Polynesia is shown to be D. longipes s. str., whereas specimens from Guam are here referred to a new pseudocryptic species, D. michalis n. sp. The two species are described and figured; and a revised key to the long-legged Discoplax species is provided.

  12. A new species of decorator crabs, genus Menaethiops Alcock, 1895 (Crustacea: Decapoda: Brachyura: Majoidea: Epialthidae), from Abu-Musa Island, Persian Gulf, Iran.

    Science.gov (United States)

    Naderloo, Reza

    2015-03-02

    Menaethiops abumusa n. sp. is closely similar to M. bicornis Alcock, 1985, and M. gadaniensis Kazmi & Tirmizi, 1999, regarding the relatively contiguous rostral spines. The new species is easily distinguishable from its two congeners by having distinctly round angles of orbital eaves and distally divergent rostral spines. Whereas in M. bicornis, and M. gadaniensis, the angles of orbital eaves are anteriorly produced and rostral spines are closely attached to each other along their entire length.  Other morphological differences include the carapace spination/granulation, basal antennal segments, and morphology of the male's first gonopod. Menaethiops gadaniensis was described from Gadani, Pakistan and was only known from the type locality, but is here recorded for the first time from the Gulf of Oman.

  13. A NEW SPECIES OF RANINOIDES (CRUSTACEA : DECAPODA : RANINIDAE) FROM OFF THE SOUTHEASTERN COAST OF HAINAN ISLAND AND NANSHA ISLANDS

    Institute of Scientific and Technical Information of China (English)

    陈惠莲; MichaelTuerkay

    2001-01-01

    Ranlnoides longifions new species, off SE coast of Hainan Island, dorsal surface of carapace with an arched granular edge across carapace between the anterolateral teeth, median frontal tooth longest, second frontal teeth subquadrate.

  14. Towards a revision of the genus Periclimenes: resurrection of Ancylocaris Schenkel, 1902, and designation of three new genera (Crustacea, Decapoda, Palaemonidae).

    Science.gov (United States)

    Ďuriš, Zdeněk; Horká, Ivona

    2017-01-01

    Based on recently published molecular phylogenies of Indo-West Pacific palaemonid shrimps and further morphological evidence, the systematic position of several species of the polyphyletic genus Periclimenes is revised. The generic name Ancylocaris Schenkel, 1902 is re-established for the anemone-associated Periclimenes brevicarpalis. Actinimenesgen. n., is proposed for the anemone-associated Periclimenes inornatus, Periclimenes ornatellus and Periclimenes ornatus, all of which have a subspatulate first pereiopod. Cristimenesgen. n., is designated for the echinoderm-associated species, Periclimenes commensalis, Periclimenes cristimanus, and Periclimenes zanzibaricus, all with a unique carpo-propodal articulation of the second pereiopods. Rapimenesgen. n. is established for the hydroid and antipatharian-associated Periclimenes brucei, Periclimenes granulimanus, and Periclimenes laevimanus, for which the long, slender and unequal second pereiopods and prehensile ambulatory propodi are the main synapomorphic characters.

  15. Towards a revision of the genus Periclimenes: resurrection of Ancylocaris Schenkel, 1902, and designation of three new genera (Crustacea, Decapoda, Palaemonidae

    Directory of Open Access Journals (Sweden)

    Zdeněk Ďuriš

    2017-01-01

    Full Text Available Based on recently published molecular phylogenies of Indo-West Pacific palaemonid shrimps and further morphological evidence, the systematic position of several species of the polyphyletic genus Periclimenes is revised. The generic name Ancylocaris Schenkel, 1902 is re-established for the anemone-associated P. brevicarpalis. Actinimenes gen. n., is proposed for the anemone-associated P. inornatus, P. ornatellus and P. ornatus, all of which have a subspatulate first pereiopod. Cristimenes gen. n., is designated for the echinoderm-associated species, P. commensalis, P. cristimanus, and P. zanzibaricus, all with a unique carpo-propodal articulation of the second pereiopods. Rapimenes gen. n. is established for the hydroid and antipatharian-associated P. brucei, P. granulimanus, and P. laevimanus, for which the long, slender and unequal second pereiopods and prehensile ambulatory propodi are the main synapomorphic characters.

  16. Resurrection of Rhynchoplax Stimpson, 1858, with the description of two new species from Japan and Australia (Crustacea: Decapoda: Brachyura: Hymenosomatidae).

    Science.gov (United States)

    Komai, Tomoyuki; Poore, Gary C B

    2016-03-24

    Rhynchoplax Stimpson, 1858, is resurrected from synonymy with Halicarcinus White, 1846. Rhynchoplax hondai Takeda & Miyake, 1971, a species based on an immature female, is rediagnosed and two new species, R. magnetica n. sp. from northeastern Australia and R. minutula n. sp. from the Ryukyu Islands, Japan, are described. They differ from R. hondai in the shape of the rostrum, form of the subhepatic region and the armature of the pereopodal meri. All differ from the type species R. messor Stimpson, 1858, in having a longer and simple rostrum without supraocular pseudorostral spines and the absence of a postocular spine.

  17. New distribution records of the gall crab Opecarcinus cathyae van der Meij, 2014 (Decapoda: Brachyura: Cryptochiridae) from the Red Sea, Maldives and Japan

    KAUST Repository

    Meij, Sancia E. T.

    2016-11-12

    The gall crab Opecarcinus cathyae van der Meij, 2014 has been reported from various localities in Indonesia and Malaysia. Recent surveys in the Red Sea, Maldives and Japan yielded additional specimens of O. cathyae, considerably expanding the known distribution range of this species to the east and west. The identity of O. cathyae was confirmed based on COI sequence data, revealing identical haplotypes for the Red Sea, Maldivian and Japanese material and three haplotypes in the Indonesian material. Opecarcinus cathyae has one of the widest known recorded distribution ranges for all gall crab species.

  18. Digging deeper: new gene order rearrangements and distinct patterns of codons usage in mitochondrial genomes among shrimps from the Axiidea, Gebiidea and Caridea (Crustacea: Decapoda

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    Mun Hua Tan

    2017-03-01

    Full Text Available Background Whole mitochondrial DNA is being increasingly utilized for comparative genomic and phylogenetic studies at deep and shallow evolutionary levels for a range of taxonomic groups. Although mitogenome sequences are deposited at an increasing rate into public databases, their taxonomic representation is unequal across major taxonomic groups. In the case of decapod crustaceans, several infraorders, including Axiidea (ghost shrimps, sponge shrimps, and mud lobsters and Caridea (true shrimps are still under-represented, limiting comprehensive phylogenetic studies that utilize mitogenomic information. Methods Sequence reads from partial genome scans were generated using the Illumina MiSeq platform and mitogenome sequences were assembled from these low coverage reads. In addition to examining phylogenetic relationships within the three infraorders, Axiidea, Gebiidea, and Caridea, we also investigated the diversity and frequency of codon usage bias and mitogenome gene order rearrangements. Results We present new mitogenome sequences for five shrimp species from Australia that includes two ghost shrimps, Callianassa ceramica and Trypaea australiensis, along with three caridean shrimps, Macrobrachium bullatum, Alpheus lobidens, and Caridina cf. nilotica. Strong differences in codon usage were discovered among the three infraorders and significant gene order rearrangements were observed. While the gene order rearrangements are congruent with the inferred phylogenetic relationships and consistent with taxonomic classification, they are unevenly distributed within and among the three infraorders. Discussion Our findings suggest potential for mitogenome rearrangements to be useful phylogenetic markers for decapod crustaceans and at the same time raise important questions concerning the drivers of mitogenome evolution in different decapod crustacean lineages.

  19. Crustacea decapoda da praia rochosa da Ilha do Farol, Matinhos, Paraná: II. Distribuição espacial de densidade das populações

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    Setuko Masunari

    1998-01-01

    Full Text Available Decapod crustaceans from rocky shore at Farol Isle, Matinhos, Paraná, Brazil. II. Spatial distribution of population densities. A study of the spatial distribution of the decapod populations from a rocky shore at Farol Isle, Matinhos, State of Paraná, Brazil (25º51'S, 48º32'W was canied out. In the supralittoral the rocky surface is covered partially by a layer of litter coming from the terrestrial habitats; in the midlittoral boulders and pebbles cover the rocky basin and in the infralittoral, there is a belt of seaweeds. A total of 8 samples were taken by hand, two from each of the following levels: supralittoral (emersion time 8-12 hours, upper midlittoral (4-8, lower midlittoral (0-4 and limit between midlittoral and infralittoral, monthly, from May/1990 to April/1991. The number of species increased from supralittoral (5 to infralittoral (22 and a clear vertical zonation on density was observed according to the emersion time gradient. The supralittoral is characterized by grapsids Armases angustipes (Dana, (1852, Cyclograpsus integer H. Milne Edwards, 1837 and Metasesarma rubripes (Rathbun, 1897 which have terrestrial habits and aerial respiration as a main way in obtaining the oxygen. In the midlittoral, the decapods show three basic types of adaptation against emersion desiccation and thermal stresses: (1 by digging into wet mud among the stones such as Panopeus americanus Saussure, 1857, Panopeus occidentalis Saussure, 1857 and Eurypanopeus abbreviatus Stimpson, 1860, (2 by resting in shady and wet space between the boulders and pebbles or underside of them, like Pachygrapsus transversus (Gibbes, 1850, Petrolisthes armatus (Gibbes, 1850 and adults of Menippe nodifrons Stimpson, 1859 and (3 by clinging over the soaked filamentous algae layer on the pebbles or bouders surfaces, a strategy observed in small species such as Pilumnus dasypodus Kingsley, 1879, Podochela sp., Petrolisthes galathinus (Bosc, 1801 , Alpheus bouvieri A. Milne Edwards, 1878 and juveniles of Menippe nodifrons. In the infralittoral, small species which are vulnerable to desiccation stresses share space by diversification of their diet and adaptation strategies such as camouflage, body color change according to the substratum, flattened body for tight adhesion on hard surface and rapid movements. The main species of this zone are Petrolisthes armatus, Petrolisthes galathinus, juveniles of Menippe nodifrons, Epialtus brasiliensis Dana, 1852, P. dasypodus, Synalpheus fritzmuelleri Coutière, 1909, Megalobrachium roseum (Rathbun, 1900 and species of Palaemonidae. The rocky shore at Farol Isle is a complex architectural environment due to the conjunction of diversified habitats such as litter over a hard surface, spaces and crevices among boulders and pebbles, muddy substratum and phytal.

  20. Deep-sea shrimps of the genus Bythocaris G.O. Sars in the collections of Russian museums, with the description of a new species (Crustacea: Decapoda: Hippolytidae)

    NARCIS (Netherlands)

    Sokolov, V.

    2000-01-01

    The collections of Bythocaris in Russian museums and research institutes were studied. Three species, B. biruli Kobjakova, 1964, B. curvirostris Kobjakova, 1957 and B. irene Retovsky, 1946, are redescribed, and a new species, B. kobjakovae spec. nov. is described. The intra-specific variation of six

  1. [Reproductive pattern and mean size of sexual maturity of female lobsters Panulirus gracilis (Decapoda: Palinuridae) in Playa Lagarto, Guanacaste, Costa Rica].

    Science.gov (United States)

    Naranjo Madrigal, Helven

    2012-12-01

    The lobster P. gracilis is important as a fishery resource and also contributes to food security of fishers in coastal communities in the North Pacific of Costa Rica. Due to the importance of updating knowledge related to the reproductive pattern of this species, we analyzed 357 specimens of female lobsters caught by the fishing methods of "hookah" and lung diving, from November 2007 to October 2008 in Playa Lagarto. Furthermore, we examined the size composition by depth; monthly pattern of reproductive activity (RAI) associated with the relative increase in sea surface temperature, and also the mean size at maturity using Generalized Linear Models. Four physiological states of sexual maturity showed that females with no signs of mating or sexual maturity have a minimum mean size of 62.3mm of cephalothorax length (CL). There are characteristics of functional maturity from very small sizes ranging from 30 to 50mm CL, being the smallest berried female reported for this specie of 35.8mm CL and the highest percentage of mature females between 70 and 80mm CL. Percentages of RAI remained above 50% during the year except October and January. In addition, it observed an increase in the RAI that started from April and continued until August associated with a relative increase in temperature on March, although the correlation was not significant (r2=0.49, p>0.05). It is possible that the low mean size at maturity (70.2mm LC) for P. gracilis in this region is related to the fishing activity. It recommends the establishment of a ban in the region of at least five months (April-August) in order to protect the reproductive seasonality of the species and to promote a recruitment increase in the fishing areas.

  2. Species composition and abundance of the benthic community of Axiidea and Gebiidea (Crustacea: Decapoda in the Marapanim Bay, Amazon estuary, northern Brazil

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    Dalila Costa Silva

    2012-04-01

    Full Text Available The thalassinideans (Axiidea and Gebiidea encompasses approximately 615 species with reclusive habits, generally confined to extensive galleries burrowed into the sand or mud and, more rarely, in openings in reefs or the cavities of sessile animals such as sponges and coral. These species use the galleries for shelter, feeding and breeding, except during the pelagic larval stage. They inhabit estuaries, bays, lagoons, beaches, seas and both tropical and temperate oceanic areas throughout the world, distributed predominantly in the intertidal zone (mid-littoral and infralittoral zones. The aim of the present study was to assess the species composition and abundance of thalassinideans, comparing two micro-habitats (consolidated and non-consolidated substrates, and determine whether there is a correlation between abundance of the organisms and time of the year, collection sites or salinity. Twelve monthly samplings were carried out between August 2006 and July 2007 over consolidated and non-consolidated bottoms of the upper and lower portions of the mid-littoral zones, with three sub-samplings, totaling 48 monthly samples and 576 in all. A total of 651 individuals were collected - 114 Lepidophthalmus siriboia Felder & Rodrigues, 1993 and 537 Upogebia vasquezi Ngoc-Ho, 1989. There was correlation between the abundance of both species and salinity, but U. vasquezi was more abundant in the rainy season. Lepidophthalmus siriboia appears to prefer non-consolidated substrates, whereas U. vasquezi prefers consolidated substrates. The recruitment period for the callianassid L. siriboia appears to occur in just two periods of the year and is more intense in the dry season, whereas U. vasquezi is more frequent throughout the year. The smallest and largest sizes (carapace length - CL recorded for L. siriboia were smaller than those recorded for the species in northeastern region of Brazil. CL values for ovigerous females suggest that U. vasquezi reaches sexual maturity at a smaller size than L. siriboia.

  3. New records of xanthid crabs Atergatis roseus (Rüppell, 1830 (Crustacea: Decapoda: Brachyura from Iraqi coast, south of Basrah city, Iraq

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    Khaled Khassaf Al-Khafaji

    2017-06-01

    Full Text Available Specimens of the The Brachyuran crab Atergatis roseus (Ruppell, 1830, were collected for first times from Iraqi coast, south Al-Faw, Basrah city, Iraq, in coast of northwest of Arabian Gulf. Morphological features and distribution pattern of this species are highlighted and a figure is provided. The material was mostly collected from the shallow subtidal and intertidal areas using trawl net and hand.

  4. A Kinetic Characterization of the Gill (Na(+), K(+))-ATPase from the Semi-terrestrial Mangrove Crab Cardisoma guanhumi Latreille, 1825 (Decapoda, Brachyura).

    Science.gov (United States)

    Farias, Daniel L; Lucena, Malson N; Garçon, Daniela P; Mantelatto, Fernando L; McNamara, John C; Leone, Francisco A

    2017-08-24

    We provide a kinetic characterization of (Na(+), K(+))-ATPase activity in a posterior gill microsomal fraction from the semi-terrestrial mangrove crab Cardisoma guanhumi. Sucrose density gradient centrifugation reveals two distinct membrane fractions showing considerable (Na(+), K(+))-ATPase activity, but also containing other microsomal ATPases. The (Na(+), K(+))-ATPase, notably immuno-localized to the apical region of the epithelial pillar cells, and throughout the pillar cell bodies, has an M r of around 110 kDa and hydrolyzes ATP with V M = 146.8 ± 6.3 nmol Pi min(-1) mg protein(-1) and K M = 0.05 ± 0.003 mmol L(-1) obeying Michaelis-Menten kinetics. While stimulation by Na(+) (V M = 139.4 ± 6.9 nmol Pi min(-1) mg protein(-1), K M = 4.50 ± 0.22 mmol L(-1)) also follows Michaelis-Menten kinetics, modulation of (Na(+), K(+))-ATPase activity by MgATP (V M = 136.8 ± 6.5 nmol Pi min(-1) mg protein(-1), K 0.5 = 0.27 ± 0.04 mmol L(-1)), K(+) (V M = 140.2 ± 7.0 nmol Pi min(-1) mg protein(-1), K 0.5 = 0.17 ± 0.008 mmol L(-1)), and NH4(+) (V M = 149.1 ± 7.4 nmol Pi min(-1) mg protein(-1), K 0.5 = 0.60 ± 0.03 mmol L(-1)) shows cooperative kinetics. Ouabain (K I = 52.0 ± 2.6 µmol L(-1)) and orthovanadate (K I = 1.0 ± 0.05 µmol L(-1)) inhibit total ATPase activity by around 75%. At low Mg(2+) concentrations, ATP is an allosteric modulator of the enzyme. This is the first study to provide a kinetic characterization of the gill (Na(+), K(+))-ATPase in C. guanhumi, and will be useful in better comprehending the biochemical underpinnings of osmoregulatory ability in a semi-terrestrial mangrove crab.

  5. First zoeal stage of Processidae (Decapoda, Caridea): review and new descriptions of Ambidexter symmetricus Manning and Chace 1971 and Processa fimbriata Manning and Chace 1971

    Science.gov (United States)

    Terossi, Mariana; Mantelatto, Fernando Luis

    2014-12-01

    This study reviews the morphology of the first zoeal stage of the pantropical and subtropical marine shrimps of the family Processidae. We present the first descriptions of the zoea I of Ambidexter symmetricus and Processa fimbriata and compare them with available published descriptions, in order to detect patterns to differentiate the genera. Among the species of Processidae, the zoea I of Ambidexter can be differentiated by the presence of a rostrum, and the resemblance to Nikoides and Processa, previously reported for adults, is now confirmed for the larval morphology. Based on the new descriptions, A. symmetricus and A. panamensis can be easily separated by four independent larval characters: anterior tubercle on the carapace (present in A. panamensis and absent in A. symmetricus), the antennal scale (segmented distally in A. panamensis and unsegmented in A. symmetricus), and the anal spine and second pereiopod (absent in A. panamensis and present in A. symmetricus). P. fimbriata can be separated from the other 11 species of Processa by means of two larval characters: 4 aesthetascs on the exopod of the antennules, and the presence of an anal spine.

  6. Changes during late-stage embryonic development from egg-juvenile to free-living hatchling in Chinese freshwater crab Sinopotamon yangtsekiense (Decapoda, Brachyura,Potamidae)

    Institute of Scientific and Technical Information of China (English)

    XUE Junzeng; LIU Yan; Neil CUMBERLIDGE; WU Huixian

    2013-01-01

    This study expands on recent reports that direct development in the Chinese potamid freshwater crab Sinopotamon yangtsekiense involves the completion of all brachyuran larval stages (nauplius,zoea,and megalopa) inside the egg case during embryonic development.Detailed studies of embryonic development in this species revealed the presence of an additional larval stage (the egg-juvenile) between the megalopa and the free-living hatchling crab.We described and compared the appendages of the head,thorax,and abdomen of the egg-juvenile with those of the hatchling crab in S.yangtsekiense.Significant differences were found between most of the appendages of these two stages with a soft exoskeleton in the egg-juvenile,no joint articulation,a slimmer appearance,and a lack of setae when compared with the newly emerged free-living hatchling crab.These modifications of the appendages are related to the confinement within the egg case of the egg-megalopa and egg-juvenile during direct development,and the need for the free-living hatchling freshwater crab to move,feed,and respire.In marine crabs,the megalopa gives rise to the first crab stage whereas in freshwater crabs the egg-juvenile follows the megalopa and immediately precedes the free-living first crab stage.

  7. Evaluación de palaemonetes argentinus (Decapoda, Natantia en el control biológico de larvas de Culex pipiens (Diptera, Culicidae en condiciones de laboratorio

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    Giri Federico

    2003-01-01

    Full Text Available The predator-prey relationship of Palaemonetes argentinus Nobili, 1901 and Culex pipiens s.l. larvae was studied under laboratory conditions. The prawns were separated in two groups, isolated and grouped ones. Mosquitoe larvae were offered to prawns in two forms, limited and unlimited offer to both groups. In the first analysis, values of predation did not differ significantly between males and females of P. argentinus. Predation in 24 h was 14,9 ± 4,2 larvae/prawn. A reduction of predation was observed with unlimited offer for the same hour, during all the experiment. Predation with unlimited offer was higher on the first day than on the second, but returned to high values on the third day, for both groups. In the grouped experiment, predation with limited offer was total on the first days, decreasing to the last day. As a result, P. argentinus was considered an efficient predator of C. pipiens s.l. larvae under laboratory conditions.

  8. Morphological variation of freshwater crabs Zilchiopsis collastinensis and Trichodactylus borellianus (Decapoda, Trichodactylidae) among localities from the middle Paraná River basin during different hydrological periods

    Science.gov (United States)

    Torres, María Victoria; Collins, Pablo Agustín; Giri, Federico

    2014-01-01

    Abstract Measures of hydrologic connectivity have been used extensively to describe spatial connections in riverine landscapes. Hydrologic fluctuations constitute an important macrofactor that regulates other environmental variables and can explain the distribution and abundance of organisms. We analysed morphological variations among individuals of two freshwater crab species, Zilchiopsis collastinensis and Trichodactylus borellianus, from localities of the middle Paraná River basin during two phases of the local hydrological regime. Specimens were sampled at sites (localities) of Paraná River, Saladillo Stream, Salado River and Coronda River when water levels were falling and rising. The conductivity, pH, temperature and geographical coordinates were recorded at each site. The dorsal cephalothorax of each crab was represented using 16 landmarks for Zilchiopsis collastinensis and 14 landmarks for Trichodactylus borellianus. The Canonical Variate Analyses showed differences in shape (for both species) among the crabs collected from the Paraná and Salado Rivers during the two hydrologic phases. We did not find a general distribution pattern for shape among the crab localities. During falling water, the shapes of Zilchiopsis collastinensis were not related to latitude-longitude gradient (i.e., showing greater overlap in shape), while during rising water the shapes were ordered along a distributional gradient according to geographical location. Contrary, shapes of Trichodactylus borellianus were related to latitude-longitude during falling water and were not related to distributional gradient during rising water. The cephalothorax shape showed, in general, no statistically significant covariations with environmental variables for either species. These results show that each freshwater crab species, from different localities of the middle Paraná River, remain connected; however, these connections change throughout the hydrologic regime of the floodplain system. This study was useful for delineating how the relation among shapes of crabs of localities varies during two phases of the hydrological regime and for estimating the connections and geographical patterns in the floodplain system. PMID:25561836

  9. Relative growth and morphological sexual maturity size of the freshwater crab Trichodactylus borellianus (Crustacea, Decapoda, Trichodactylidae) in the Middle Paraná River, Argentina

    Science.gov (United States)

    Williner, Verónica; Torres, María Victoria; Carvalho, Débora Azevedo; König, Natalia

    2014-01-01

    Abstract The relative growth of a number of morphological dimensions of the South American freshwater crab Trichodactylus borellianus (Trichodactylidae) were compared and related to sexual dimorphism. Crabs were collected from ponds in the Middle Paraná River in Argentina. A regression model with segmented relationship was used to test for relative growth between these measurements where breakpoints infer the body size at which crabs reach sexual maturity. In both sexes the carapace width and the length, height, and thickness of the right and left chelae were measured, as well as the male pleopod length and the female abdomen width. All of these measurements were found to show positive allometry with the exception of the male pleopod length and the left chelae, which did not show a breakpoint. In females the breakpoint for the abdomen width inferred a morphological sexual maturity at carapace width 6.9 mm. In males the break point for the pleopod length was at carapace width 6.6 mm, with that for the chelae measurements was between carapace widths 6.4 and 6.9 mm. The relative growth pattern in Trichodactylus borellianus was found to be similar to that recorded for other species of the family Trichodactylidae. PMID:25561835

  10. What is the diet of Palaemon elegans Rathke, 1837 (Crustacea, Decapoda, a non-indigenous species in the Gulf of Gdańsk (southern Baltic Sea?

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    Urszula Janas

    2008-06-01

    Full Text Available Palaemon elegans, a new component of the Gulf of Gdańsk macrozoobenthos,colonised the southern Baltic coastal zone in the late 20th and early 21stcentury. Analysis of the stomach contents of P. elegans revealed 16plant and animal taxa that these prawns had fed on. The principal dietarycomponent was detritus, with a mean frequency of occurrence in stomachs of > 80%.The most frequently occurring plant components in the diet were algaefrom the genus Cladophora and the family Ectocarpaceae, while the mostsignificant animal components were Harpacticoida, Chironomidae, Ostracoda andGammarus spp. The results of the study show that the dietary composition ofP. elegans differed significantly between stations and months. The foraging area consisted of two distinctive regions - the Inner Puck Bay, and the Outer Puck Bay together with the Dead Vistula River; two of the stations - Gdynia and Sopot - were distinctfrom all the others. However, no obvious seasonality in the food compositioncould be demonstrated.

  11. Occurrence of Macrobrachium amazonicum (Heller (Decapoda, Palaemonidae in Leopoldo's inlet (Ressaco do Leopoldo, upper Paraná River, Porto Rico, Paraná, Brazil

    Directory of Open Access Journals (Sweden)

    Andréa Bialetzki

    1997-01-01

    Full Text Available Studies on the occurrence, temporal distribution and nychthemeral variation of Macrobrachium amazonicum (Heller, 1862 were undertaken in Leopoldo's Inlet, upper Paraná River, Porto Rico, Paraná, Brazil. Seventeen thousand and sixty specimens (11,786 larvae and 5,274 juveniles were captured with a conicalcylindrical plankton net of mesh 0.5mm in monthly samples between February 1991 and February 1992. Results show that the greatest densities of larvae (301.83 larvae/10m³ and juveniles (168.8/10m³ of this species were caught in December 1991. Largest captures were made during the night. With regard to abiotic factors water temperature ranged from 20º to 30ºC, pH ranged from 5.66 to 7.37 and electric conductivity ranged from 51.83 to 65.33µS/cm. Relationship between the density of larvae and juveniles and abiotic factors was calculated by the Principal Components Analysis (PCA which revealed the influence of some limnological variables especially on the distribution of larvae.

  12. Species Diversity and Abundance of Marine Crabs (Portunidae: Decapoda) from a Collapsible Crab Trap Fishery at Kung Krabaen Bay, Chanthaburi Province, Thailand

    Science.gov (United States)

    Kunsook, Chutapa; Dumrongrojwatthana, Pongchai

    2017-01-01

    The diversity and abundance of marine crabs from a collapsible crab trap fishery at Kung Krabaen Bay, Gulf of Thailand, were observed from August 2012 to June 2013 using 10 sampling stations. The results showed that there were seven families, 11 genera and 17 species (two anomuran and 15 brachyuran crabs). The two anomuran species were Clibanarius virescens (1,710 individuals) and Clibanarius infraspinatus (558 individuals). For brachyuran crabs, Portunidae was the most common family, including 10 species. The dominant species of brachyuran crabs included Thalamita crenata (897 individuals), Portunus pelagicus (806 individuals), Charybdis affinis (344 individuals), Scylla sp. (201 individuals), and Charybdis anisodon (100 individuals). The abundance of crabs was affected by the habitat type. Anomuran crabs had the highest abundance in Halodule pinifolia seagrass beds, whilst brachyurans had the highest abundance in Enhalus acoroides seagrass beds. The dominant brachyuran species were found in pelagic areas near the bay mouth, such as P. pelagicus, P. sanguinolentus, C. feriatus, C. helleri, C. natator, C. affinis, and M. hardwickii. Lastly, reforested mangroves were important habitats for Scylla tranquebarica and C. anisodon. Seasonal and physical factors influenced the abundance of some crabs, for example, the abundance of C. virescens was correlated with temperature, and the abundance of T. crenata was correlated with transparency depth. Our results revealed that Kung Krabaen Bay serves as the home to many marine crab species; however, our results also revealed that 49% of the harvested crabs (2,308 out of 4,694 individuals) were simply discarded and subsequently died. Moreover, our research noted that eight non-target species will become target species in the near future. Therefore, research on the reproductive biology of some marine crabs and an improved understanding of the importance of marine crabs by local fishermen are necessary to prevent biodiversity degradation and loss in this area. PMID:28228916

  13. The genus Hippolyte Leach, 1814 (Crustacea: Decapoda: Caridea: Hippolytidae) in the East Atlantic Ocean and the Mediterranean Sea, with a checklist of all species in the genus

    NARCIS (Netherlands)

    d'Udekem d'Acoz, C.

    1996-01-01

    The genus Hippolyte Leach in the East Atlantic and the Mediterranean is revised and a list of the world species is given. Eleven species occur in the area studied: H. coerulescens (Fabricius), H. garciarasoi spec. nov., H. inermis Leach, H. lagarderei d'Udekem d'Acoz, H. leptocerus (Heller), H.

  14. Modulation by K+ Plus NH4+ of microsomal (Na+, K+-ATPase activity in selected ontogenetic stages of the diadromous river shrimp Macrobrachium amazonicum (Decapoda, Palaemonidae.

    Directory of Open Access Journals (Sweden)

    Francisco A Leone

    Full Text Available We investigate the synergistic stimulation by K(+ plus NH4 (+ of (Na(+, K(+-ATPase activity in microsomal preparations of whole zoea I and decapodid III, and in juvenile and adult river shrimp gills. Modulation of (Na(+, K(+-ATPase activity is ontogenetic stage-specific, and particularly distinct between juveniles and adults. Although both gill enzymes exhibit two different sites for K(+ and NH4 (+ binding, in the juvenile enzyme, these two sites are equivalent: binding by both ions results in slightly stimulated activity compared to that of a single ionic species. In the adult enzyme, the sites are not equivalent: when one ion occupies its specific binding site, (Na(+, K(+-ATPase activity is stimulated synergistically by ≈ 50% on binding of the complementary ion. Immunolocalization reveals the enzyme to be distributed predominantly throughout the intralamellar septum in the gill lamellae of juveniles and adults. Western blot analyses demonstrate a single immunoreactive band, suggesting a single (Na(+, K(+-ATPase α-subunit isoform that is distributed into different density membrane fractions, independently of ontogenetic stage. We propose a model for the modulation by K(+ and NH4 (+ of gill (Na(+, K(+-ATPase activity. These findings suggest that the gill enzyme may be regulated by NH4 (+ during ontogenetic development in M. amazonicum.

  15. Patrón reproductivo y talla media de madurez sexual de hembras de la langosta Panulirus gracilis (Decapoda: Palinuridae en Playa Lagarto, Guanacaste, Costa Rica

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    Helven Naranjo Madrigal

    2012-12-01

    Full Text Available La langosta Panulirus gracilis es importante como recurso pesquero de las comunidades costeras en el Pacífico Norte de Costa Rica. Debido a la importancia de actualizar el conocimiento relacionado con el patrón reproductivo de esta especie, se analizaron 357 especímenes de langostas P. gracilis hembras capturados mediante el buceo con compresor y el buceo a pulmón durante noviembre de 2007 a octubre del 2008 en Playa Lagarto. Se examinó la composición de las tallas por estrato de profundidad, el patrón mensual de la actividad reproductiva (IAR asociado al aumento relativo de la temperatura superficial del océano, y además se determinó la talla media de madurez sexual utilizando Modelos Lineales Generalizados. Los cuatro estados fisiológicos de madurez sexual mostraron que las hembras sin masa espermatófora y no ovígeras, presentaron las menores tallas con una media de 62.3mm de longitud cefalotoráxica (LC. Se observaron características de madurez sexual a partir de tallas muy bajas que van desde 30 a 50mm de LC, encontrándose la menor hembra ovígera reportada para esta especie de 35.8mm de LC y el mayor porcentaje de hembras maduras entre 70 y 80mm de LC. Los porcentajes del IAR se mantuvieron por encima del 50% durante el año, con excepción de los meses de octubre y enero. Además, se observó un aumento en el IAR que inició a partir de abril y continuó hasta agosto asociado a un relativo aumento en la temperatura a partir del mes de marzo, sin embargo esta relación no fue significativa (r²=0.49, p>0.05. No se descarta que la baja talla media de madurez sexual de 70.2mm de LC para P. gracilis en esta región sea causada por las prácticas de pesca. Se recomienda que se establezca una veda en la región de cinco meses (abril-agosto con el fin de proteger la estacionalidad reproductiva de la especie y promover un mayor reclutamiento a las áreas de pesca.

  16. Coeficientes de utilizacion digestiva aparente de materia seca, proteina y aminoacidos esenciales de ingredientes terrestres para el camaron del Pacifico Litopenaeus vannamei (Decapoda: Penaeidae)

    National Research Council Canada - National Science Library

    Terrazas, Martin; Civera, Roberto; Ibarra, Lilia; Goytortua, Ernesto

    2010-01-01

    ...). Los ingredientes evaluados fueron: caseina (CAS), harinas de subproductos avicolas (HSPA) y porcicolas (HSPP), gluten de maiz (GLM) y trigo (GLT), pasta de soya (PS), harinas de sorgo (HS) y trigo (HT). La DAMS y DAP variaron entre 68...

  17. A new species of the snapping shrimp genus Alpheus (Crustacea: Decapoda: Caridea: Alpheidae) from Japan, associated with the innkeeper worm Ikedosoma elegans (Annelida: Echiura: Echiuridae).

    Science.gov (United States)

    Komai, Tomoyuki

    2015-12-15

    A new species of the snapping shrimp genus Alpheus Fabricius, 1798, Alpheus ikedosoma, is described and illustrated on the basis of material from Boso Peninsula and Ariake Sea, Japan. All examined specimens were extracted with the help of a bait suction pump from burrows of innkeeper worm (Annelida: Echiura), constructed on easily accessible intertidal sand beaches or sand flats. The host worm from Boso Peninsula was identified as Ikedosoma elegans (Ikeda, 1904) (Echiuridae). The new species is tentatively referred to the A. brevirostris (Olivier, 1811) species group, but it is characteristic in having several unusual features for the group, such as the very short rostrum without dorsal ridge, the absence of adrostral grooves on the carapace, the strongly reduced dorsolateral spines on the telson, the unarmed antennal basicerite, the non-elongate, almost glabrous major chela, and the lack of movable spines or spinules on ventromesial margin of each cheliped merus. The new species represents the sixth species of Alpheus associated with echiuran burrows.

  18. Fine structure of the spermatozoon in three species of Cambaridae (Arthropoda: Crustacea: Decapoda Cambarus robustus, Orconectes propinquus and Orconectes rusticus: a comparative biometrical study

    Directory of Open Access Journals (Sweden)

    Buket Yazicioglu

    2016-08-01

    Full Text Available The ultrastructure of spermatozoa in three species of cambarid crayfish, Cambarus robustus, Orconectes propinquus, and Orconectes rusticus, were studied and compared with eight previously studied species from different crayfish families using morphological features and biometrical data. The ultrastructure of spermatozoa show a generally conserved pattern including an acrosome and nucleus in the anterior and posterior parts of the cell, respectively, radial arms that wrap around the nucleus, and the whole cell is enclosed by an extracellular capsule. The most outstanding morphological feature in spermatozoa of three studied cambarid crayfish is the crest-like protrusions in the anterior part of the acrosome that can be used as one of the features for distinguishing the members of this family. Results of biometrical data reveal that acrosome size in the representatives of Parastacidae are the smallest, while representatives of Astacidae show the biggest acrosome. The acrosome size in species belonging to Cambaridae occupy an intermediate position between the two other families of freshwater crayfish. In conclusion, a combination of morphological features and biometrical data of spermatozoa can help distinguishing different species of the freshwater crayfish.

  19. Variability in prevalence of Cymatocarpus solearis (Trematoda, Brachycoeliidae) in Caribbean spiny lobsters Panulirus argus (Decapoda: Palinuridae) from Bahía de la Ascensión (Mexico).

    Science.gov (United States)

    Briones-Fourzán, Patricia; Muñoz de Cote-Hernández, Rubén; Lozano-Álvarez, Enrique

    2016-06-01

    Cymatocarpus solearis, a brachycoeliid trematode that parasitizes sea turtles, uses spiny lobsters Panulirus argus as second intermediate hosts. We examined variability in infection by C. solearis in Bahía de la Ascensión, Mexico, a tropical bay with a highly productive fishery for P. argus that is based on the extensive use of casitas (large artificial shelters), which can harbor multiple juveniles and adults of this gregarious lobster species. We sampled 3956 lobsters from 466 casitas distributed over three bay zones within two closed seasons and one fishing season. In these lobsters (9.5-115.2mm carapace length, CL), the average infection prevalence was 11.7% but the probability of infection increased significantly with size. Prevalence varied with season but was consistently higher in one zone than in the other two zones. Infection with C. solearis was negatively related with clinical infection with Panulirus argus Virus 1 (PaV1). We also sampled 405 lobsters from the commercial catch obtained throughout the bay at the onset of the fishing season. In these relatively larger lobsters (70.3-168.0mm CL), average prevalence of C. solearis was higher (23.5%) but was not affected by lobster size or sex. Encysted metacercariae occurred in both abdominal and cephalothoracic muscles. The effects of C. solearis on phenotypic traits of P. argus that may potentially impact the host population dynamics and fisheries remain to be investigated. Copyright © 2016 Elsevier Inc. All rights reserved.

  20. Fecundity of the spider crab Mithraculus forceps (Decapoda, Mithracidae from the northeastern coast of the state of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Valter J. Cobo

    2008-03-01

    Full Text Available Fecundity is one of the most important parameters in studying the reproductive output of Pleocyemata decapods, especially because of its relationship to the efficiency of population replacement. Knowledge of fecundity provides basic elements for understanding the reproductive strategies, dynamics, and evolution of a given population. The present investigation provides informations on fecundity, egg size, egg loss, and the relationship between fecundity and selected environmental features, for the spider crab Mithraculus forceps (A. Milne Edwards, 1875. Ovigerous crabs were collected each month during 2000, by SCUBA diving, at Couves Island (23º25'25"S, 44º52'03"W on the northeastern coast of the state of São Paulo, Brazil. A total of 40 ovigerous females with egg in early development (initial stage and 28 final stage eggs were obtained and analyzed. Mean fecundity, from eggs of the initial stage, was 402.8 ± 240.1 eggs, ranging from 60 to 1,123 eggs. Sizes of females ranged from 9.4 to 14.0 mm carapace width. Mean egg size was 0.56 ± 0.06 mm diameter. A 20.33% rate of egg loss was estimated by comparing the fecundities of batches of eggs in early and late development (40 initial batches and 28 final stages batches. There were no significant relationships between the water temperature or salinity and variations in fecundity. As in most brachyuran species, M. forceps showed a strong conservative relationship between fecundity and body size.