WorldWideScience

Sample records for aegla schmitti crustacea

  1. Induction of ovarian growth in Aegla platensis (Crustacea, Aeglidae by means of neuroregulators incorporated to food

    Directory of Open Access Journals (Sweden)

    Alejandra V Cahansky

    2008-09-01

    Full Text Available The freshwater crab Aegla platensis was used as a model to induce ovarian growth by adding different neuroregulators to a pellet food formulation. Added compounds were the dopaminergic inhibitor spiperone or the enkephalinergic inhibitor naloxone, both of them at a dose of 10-8 mol/animal. Animals were fed on the enriched pellets twice a week. After 7 wk, the gonadosomatic index (GI was calculated as (gonad fresh weight / body fresh weight x 100. GI significantly increased only for those females fed on spiperone pellets, compared to a control group receiving pellets with no compound added. During the assayed period, spiperone would be reverting the arrest exerted by dopamine on the neuroendocrine stimulation of ovarian growth. On the other hand, for both spiperone and naloxone a higher GI was correlated to a higher lipid content of both gonads and/or hepatopancreas, suggesting an increased energetic demand in accordance with an active investment in reproduction. Rev. Biol. Trop. 56 (3: 1201-1207. Epub 2008 September 30.Se utilizó al anomuro de agua dulce Aegla platensis como modelo para inducir el crecimiento ovárico mediante el agregado de diferentes neuroreguladores a una formulación de alimento pelleteado. Los compuestos agregados fueron el inhibidor dopaminergico spiperona ó el inhibidor encefalinérgico naloxone, ambos a una dosis de 10-8 moles/animal. Los animales fueron alimentados dos veces a la semana con pellets enriquecidos con alguno de los neuroreguladores. Luego de 7 semanas, se calculó el índice gonadomático (IG como (peso gonadal fresco/ peso corporal fresco x 100. El IG mostró un incremento significativamente sólo en aquellas hembras alimentadas con pellets enriquecidos con spiperona, en comparación con un grupo control que recibió pellets sin agregado alguno. Durante el período ensayado, la spiperona estaría revirtiendo el arresto ejercido por la dopamina sobre la estimulación neuroendocrina del crecimiento ov

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

    Directory of Open Access Journals (Sweden)

    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.

  3. High genetic differentiation of Aegla longirostri (Crustacea, Decapoda, Anomura) populations in southern Brazil revealed by multi-loci microsatellite analysis.

    Science.gov (United States)

    Bartholomei-Santos, M L; Roratto, P A; Santos, S

    2011-01-01

    Species with a broad distribution rarely have the same genetic make-up throughout their entire range. In some cases, they may constitute a cryptic complex consisting of a few species, each with a narrow distribution, instead of a single-, widely distributed species. These differences can have profound impacts for biodiversity conservation planning. The genetic differentiation of four populations of Aegla longirostri, a freshwater crab found in two geographically isolated basins in Rio Grande do Sul State, Brazil, was investigated by analyzing pentanucleotide multi-loci microsatellites in a heteroduplex assay. Although no morphological differences were evident, we found significant genetic differentiation among the four populations, based on F(ST) values and clustering analysis. This high level of differentiation may be indicative of cryptic species in these populations. If this hypothesis is correct, then the species occurring in the Ibicuí-Mirim River, at the southern limit of the Atlantic Rain Forest, would be under threat, considering its very restricted distribution. PMID:22179994

  4. Perfil metabólico de Aegla platensis Schmitt, (Crustacea, Aeglidae, Anomura submetida a dietas ricas em carboidratos ou proteínas Metabolic profile of Aegla platensis Schmitt, (Crustacea, Anomura submitted to carbohydrate-rich or high-protein diets

    Directory of Open Access Journals (Sweden)

    Bibiana Della P. Ferreira

    2005-03-01

    Full Text Available O objetivo desse estudo foi avaliar o efeito de uma dieta rica em carboidratos e uma dieta rica em proteínas sobre o metabolismo de Aegla platensis, um caranguejo anomuro de água doce. Os animais foram coletados no Arroio do Mineiro, município de Taquara, Rio Grande do Sul, em agosto/2002 e janeiro/2003, e foram alimentados durante 15 dias com carne bovina crua e arroz branco, em aquários aerados. O fotoperíodo foi controlado: 12 horas claro - 12 horas escuro. Glicose, proteínas, lipídios e triglicerídios foram dosados na hemolinfa; glicogênio e lipídios foram dosados no hepatopâncreas, brânquias e músculo. Em Aegla platensis, mantida em condições de laboratório, em todos os tecidos estudados pode ser observado que o aporte regular de alimento, bem como o tipo de dieta administrada determinaram um perfil diferenciado de resposta metabólica entre os sexos e o período de realização dos experimentos (inverno e verão.The objective of this study was to assess the effect of a carbohydrate-rich and a high-protein diets on metabolism of Aegla platensis, a freshwater anomuram crab. The animals were collected in Mineiro Creek, Taquara city, Rio Grande do Sul, at august/2002 and january/2003, and were feed during 15 days with crude bovine meat and white rice, in an aerated aquarium. The photoperiod was controlled: 12 hours day - 12 hours night. Glucose, proteins, lipids and triglycerides were dosed in haemolymph; glycogen and lipids were dosed in hepatopancreas, gills and muscle tissues. In Aegla platensis, maintained in laboratory conditions, in all studied tissues can be seen that the regular food intake, as well as the kind of administered diet determinated a differential profile of metabolic response between sexes and the period of the experiments performance (winter and summer.

  5. Maturidade sexual morfológica de Aegla platensis (Crustacea, Decapoda, Anomura no Lajeado Bonito, norte do estado do Rio Grande do Sul, Brasil

    Directory of Open Access Journals (Sweden)

    Davi de Oliveira

    2011-06-01

    Full Text Available O tamanho da primeira maturação sexual (TPM em Aegla platensis Schmitt, 1942 foi estimado através das mudanças nas proporções de dimensões corporais dos animais. Para isso, foram realizadas coletas mensais, de julho de 2007 a junho de 2008 no Lajeado Bonito (27º25'27''S, 53º24'39''W, um tributário de primeira ordem do Rio da Várzea, município de Frederico Westphalen, Rio Grande do Sul. Foram utilizados 437 machos com comprimento de cefalotórax (CC variando de 6,00 mm a 31,75 mm e 368 fêmeas, com tamanhos entre 6,08 mm e 27,92 mm de CC. As seguintes dimensões corporais foram mensuradas em todos os indivíduos coletados: comprimento do cefalotórax (CC, largura do abdome (LA, comprimento do própodo do quelípodo direito (CPD e comprimento do própodo do quelípodo esquerdo (CPE. Após o registro dessas medidas, os animais foram devolvidos ao mesmo local de captura. As análises de maturidade sexual morfológica foram realizadas com auxílio do software Mature 2, nas quais foram utilizadas as medidas de CC, considerada como variável independente e relacionada com as demais dimensões. As relações que melhor se ajustaram para estas análises, em machos, foram CPD x CC (TPM: CC=18,2 mm e CPE x CC (TPM: CC=20,1 mm e LA x CC (TPM: CC=16,5 mm nas fêmeas.

  6. Comparison of different methodologies for DNA extraction from Aegla longirostri

    Directory of Open Access Journals (Sweden)

    João Vitor Trindade Bitencourt

    2007-11-01

    Full Text Available The aim of this study was to compare some DNA extraction methodologies for Aegla longirostri. The protocols were based on the traditional phenol-chloroform DNA extraction methodology and using a commercial kit for DNA extraction. They differed in tissues used, the addition - or not - of beta-mercaptoethanol to the lysis buffer, times and methods for the animal's conservation (frozen, in ethanol or fresh. Individuals stored at -20°C for a long time supplied lower molecular weight DNA than those stored for a short time. The best yield for the specimens preserved in ethanol was obtained for 15 days storage in 95% ethanol. The kit resulted in a low quantity of high molecular weight DNA. The best protocol for DNA extraction from Aeglidae, and probably for other crustaceans should, therefore, utilize fresh specimens, with addition of beta-mercaptoethanol to the lysis buffer.Marcadores moleculares são ferramentas úteis para esclarecer dúvidas a respeito dos Aeglidae, único grupo de crustáceos Anomura de água doce. Essas técnicas dependem da obtenção de DNA de boa qualidade e sem contaminantes. O objetivo deste estudo foi comparar algumas metodologias de extração de DNA de Aegla longirostri. Quatorze protocolos foram analisados, baseados na metodologia tradicional de extração de DNA com fenol-clorofórmio, exceto o protocolo K no qual se utilizou um Kit. Os procedimentos diferiram quanto aos tecidos utilizados e a adição de beta-mercaptoetanol ao tampão de lise. Avaliaram-se também diferentes tempos e maneiras de conservação. Indivíduos congelados apresentaram maior degradação do material obtido conforme o tempo em que ficaram congelados. Para os indivíduos conservados em álcool, aqueles mantidos em etanol 95% forneceram material de melhor qualidade. A utilização do Mini Kit resultou em uma quantidade muito pequena de DNA de alto peso molecular. O melhor protocolo para extração de DNA de Aeglidae utilizou músculos e br

  7. Trophic ecology of Mustelus schmitti (Springer, 1939) in a nursery area of northern Patagonia

    Science.gov (United States)

    Molina, Juan Manuel; Cazorla, Andrea López

    2011-05-01

    Mustelus schmitti is an endangered endemic shark of the southwest Atlantic, and an important economical resource in Argentina, Brazil and Uruguay. The objective of this study was to describe the trophic ecology of M. schmitti in Anegada Bay, its feeding strategy and diet composition, along with the possible dietary shifts, due to season, sex, ontogeny and the different geographical features of the bay. Our results show that M. schmitti is a carnivorous opportunistic predator, feeding on a variety of benthic invertebrates. The diet presented seasonal and ontogenetic variations, while no differences in diet composition were observed between sexes or the different sampling sites. This species behave as a generalize feeder, with a wide trophic spectrum and a diverse diet.

  8. Ecología trófica del gatuzo, Mustellus schmitti (Springer 1939), en el Mar Argentino

    OpenAIRE

    Belleggia, M.

    2012-01-01

    The narrownose smoothhound shark Mustelus schmitti is a benthic shark distributed from Florianópolis (27°S, Brazil) to Deseado River Estuary (47º45´S, Argentina) and occurs from shallow waters to 120m. This Thesis describes the feeding ecology of narrownose smoothhound shark M. schmitti in northern Argentinean Continental Shelf and is structured in four chapters. Chapter 1 contains an introduction and includes purpose, theory and concepts. In Chapter 2, the food habits of M. schmitti were stu...

  9. Antimodernistlik tegutseja modernismis : sissejuhatus Carl Schmitti riigifilosoofilisse õpetusse / Heimes. Claus ; tõlk. Peeter Helme

    Index Scriptorium Estoniae

    Heimes. Claus

    2004-01-01

    Saksa poliitilise teoreetiku, riigiõigusasjatundja ja kristliku filosoofi Carl Schmitti (1888-1985) seisukohtadest poliitilises teoloogias ja antropoloogias, uusajatõlgendusest ning positivistliku kaasaja kriitikast. Tõlke allikas: Antimoderner Akteur der Moderne : eine Einführung in die staatsphilosophische Lehre Carl Schmitts

  10. Feeding preference of the South American endemic anomuran Aegla platensis (Decapoda, Anomura, Aeglidae)

    Science.gov (United States)

    Colpo, Karine Delevati; Ribeiro, Liara Colpo; Wesz, Bruna; Ribeiro, Ludmilla Oliveira

    2012-04-01

    In order to determine the feeding preference of Aegla platensis in streams and the importance of microorganisms in its detritivore diet, we carried out two experiments designed to evaluate the food preferences of A. platensis (1) among leaves with different levels of microbial colonization and (2) among insect larvae (Chironomidae, Simuliidae, Hydropsychidae) and microbially conditioned leaves. A. platensis preferred animal over plant food items; when only leaves were offered, this aeglid preferred the leaves with higher levels of microorganism conditioning.

  11. Dietas practicas para el cultivo de Litopenaeus schmitti: una revisión (Practical diets for Litopenaeus schmitti shrimp culture: a review

    Directory of Open Access Journals (Sweden)

    Jaime-Ceballos, Barbarito:

    2006-12-01

    Full Text Available Se resumen los resultados del trabajo desarrollado por investigadorescubanos en el campo de la alimentación y nutrición del camarónblanco Litopenaeus schmitti, referidos a la formulación de alimentosbalanceados para las fases de precría y engorde. Aporta información sobre la respuesta de dicha especie a la inclusión de materias primasconvencionales o no en dietas prácticas, constituyendo una vía deabaratamiento de las mismas mediante el uso de ingredientes nacionales. Además se muestran los resultados obtenidos en cuanto aempleo de aglutinantes, tamaños de partículas e investigaciones básicas aplicadas a esta actividad. Estos estudios han servido de base para la obtención de alimentos comerciales eficientes que sustentan el desarrollo de la camaronicultura en Cuba, propiciando el diseño de alimentos acordes a las necesidades y posibilidades del país, constituye un valioso material para el conocimiento y desarrollo del cultivo en cuanto a Results of the research workdeveloped by Cuban investigators on feeding and nutrition of white shrimp Litopenaeus schmitti, referred the food formulation for nursery and grow-out phases. It contributes information on the answer of this species to the inclusion of conventional raw materials or not in practical diets, constituting a via to reduce prices trough the use of national ingredients. In addition results obtained as far as use of aglutinantes, sizes of particles and basic investigations applied to this activity are shown. These studies have served as base to obtain efficient commercial diets that have supported the development of shrimp culture in Cuba, facilitating the designof artifitial food according to the necessities and possibilities of the country, constituting a valuable material for the knowledge anddevelopment of the culture as far as feeding and nutrition.H

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

    OpenAIRE

    Valeria P. Diawol; Federico Giri; Pablo A. Collins

    2015-01-01

    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 use...

  13. Growth enhancement of shrimp (Litopenaeus schmitti) after transfer of tilapia growth hormone gene.

    Science.gov (United States)

    Arenal, Amilcar; Pimentel, Rafael; Pimentel, Eulogio; Martín, Leonardo; Santiesteban, Dayamí; Franco, Ramón; Aleström, Peter

    2008-05-01

    Electroporation of Litopenaeus schmitti embryos was used to transfer the pE300tiGH15 plasmid that contains the tilapia growth hormone gene (tiGH) complexed with a nuclear localization signal peptide into the zygotes. The gene construct was detected in 35 (36%) of the 98 larvae screened by PCR and Southern blot analyses. Western blot analyses revealed that 34% of the screened larvae expressed a single tiGH-specific band with the expected molecular mass (23.1 kDa). The development index and larval length indicated a significant growth enhancement from day 3 on after electroporation, with an average of 32% of the growth enhancement. To our knowledge, this is the first report on gene transfer enhanced growth in crustaceans. PMID:18204820

  14. Histochemical study of the oviducal gland and analysis of the sperm storage tubules of Mustelus schmitti Springer, 1939 (Chondrichthyes, Triakidae)

    OpenAIRE

    Fernanda Gabriela Elías

    2015-01-01

    Abstract: The paired oviducal glands of immature and mature females of Mustelus schmitti were examined macro and microscopically. Findings indicate that these glands possessed the same zonation as in most chondrichthyans from anterior to posterior: club, papillary, baffle and terminal zones. The whole gland is composed by simple tubular glands that connect with transverse grooves all along the organ. The club zone presents a typical indian club shape with a simple columnar and ciliated epithe...

  15. 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.

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

    Directory of Open Access Journals (Sweden)

    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.

  17. Conflicting Evolutionary Patterns Due to Mitochondrial Introgression and Multilocus Phylogeography of the Patagonian Freshwater Crab Aegla neuquensis

    Science.gov (United States)

    Barber, Brian R.; Xu, Jiawu; Pérez-Losada, Marcos; Jara, Carlos G.; Crandall, Keith A.

    2012-01-01

    Background Multiple loci and population genetic methods were employed to study the phylogeographic history of the Patagonian freshwater crab Aegla neuquensis (Aeglidae: Decopoda). This taxon occurs in two large river systems in the Patagonian Steppe, from the foothills of the Andes Mountains east to the Atlantic Ocean. Methodology/Principal Findings A nuclear phylogeny and multilocus nested clade phylogeographic analysis detected a fragmentation event between the Negro and Chico-Chubut river systems. This event occurred approximately 137 thousand years ago. An isolation-with-migration analysis and maximum-likelihood estimates of gene flow showed asymmetrical exchange of genetic material between these two river systems exclusively in their headwaters. We used information theory to determine the best-fit demographic history between these two river systems under an isolation-with-migration model. The best-fit model suggests that the Negro and the ancestral populations have the same effective population sizes; whereas the Chico-Chubut population is smaller and shows that gene flow from the Chico-Chubut into the Negro is four times higher than in the reverse direction. Much of the Chico-Chubut system appears to have only been recently colonized while the Negro populations appear to have been in place for most of the evolutionary history of this taxon. Conclusions/Significance Due to mitochondrial introgression, three nuclear loci provided different phylogeographic resolution than the three mitochondrial genes for an ancient fragmentation event observed in the nuclear phylogeny. However, the mitochondrial locus provided greater resolution on more recent evolutionary events. Our study, therefore, demonstrates the need to include both nuclear and mitochondrial loci for a more complete understanding of evolutionary histories and associated phylogeographic events. Our results suggest that gene flow between these systems, before and after fragmentation was through periodic

  18. Efecto de ensilados de pescado e hígado de tiburón en el crecimiento de Litopenaeus schmitti, en sustitución de la harina y el aceite de pescado(Effect of fish silage and liver of sharks in the growth of Litopenaeus schmitti in place of fish meal and fish oil

    Directory of Open Access Journals (Sweden)

    Fraga-Castro, Iliana E

    2011-11-01

    Full Text Available ResumenDos diseños experimentales completamente aleatorizado se desarrollaron durante 6 semanas, para evaluar el efecto de dietas con ensilados de pescado (EP e hígado de tiburón (EHT, en el crecimiento de juveniles de camarón blanco Litopenaeus schmitti (peso inicial 1.3 ± 0.12 g. El EP con desechos de tilapia se incluyó en las dietas a niveles de 0, 16.5, 27.5 y 31 %, en sustitución de la harina de pescado.AbstractIn order to evaluate the effect of diets with fish silage (EP and shark liver (EHT, the growth of juvenile white shrimp Litopenaeus schmitti (mean initial weight 1.3 ± 0.12, developed a laboratory scale two completely randomized design for 6 weeks.

  19. Histochemical study of the oviducal gland and analysis of the sperm storage tubules of Mustelus schmitti Springer, 1939 (Chondrichthyes, Triakidae

    Directory of Open Access Journals (Sweden)

    Fernanda Gabriela Elías

    2015-08-01

    Full Text Available Abstract: The paired oviducal glands of immature and mature females of Mustelus schmitti were examined macro and microscopically. Findings indicate that these glands possessed the same zonation as in most chondrichthyans from anterior to posterior: club, papillary, baffle and terminal zones. The whole gland is composed by simple tubular glands that connect with transverse grooves all along the organ. The club zone presents a typical indian club shape with a simple columnar and ciliated epithelium including secretory cells PAS (+ and AB (+. The papillary zone is characterized by lamella forming small and long cones in numbers of three. The epithelium of this zone contains ciliated cells with apical nuclei and secretory cells with basal nuclei that stain AB (+The baffle zone consists of apically flattened lamellae alternating with spinnerets which are small projections disposed by both sides of the plateau. This whole structure is present in number of 8 or 9 units. A simple columnar ciliated epithelium covers the plateau and spinnerets and no AB or PAS staining is observed. The epithelium of the terminal zone is PAS (- and AB (+, and elongated tubules, that run adjacent to the baffle zone are the site where groups of spermatozoa are clearly observed in the lumen. The epithelium of the sperm storage tubules do not stain with any of the dyes tested. Sperm was also observed in the baffle zone, presumably in its way to the fecundation in the oviduct because it displays no aggregation pattern and was between the folds of the epithelium. By scanning electron microscopy sperm was observed in the club and baffle zones in a gland which belonged to a pregnant female.

  20. Over de eerste vondsten van twee Pennella-soorten (Crustacea: Copepoda) en van Conchoderma virgatum (Spengler) (Crustacea: Cirripedia) in Nederland

    NARCIS (Netherlands)

    Huwae, P.H.M.

    1986-01-01

    On 30 November 1941 a sunfish Mola mola (L.) was found on the beach near Schoorl (Province of Noord-Holland). The fish was parasitized by a specimen of Pennella filosa (L.) (Crustacea, Copepoda) on which a specimen of Conchoderma virgatum (Crustacea: Cirripedia) had attached itself. This is the firs

  1. Naamlijst van de Nederlandse landpissebedden (Crustacea: Isopoda: Oniscidea)

    NARCIS (Netherlands)

    Berg, M.P.

    1997-01-01

    Checklist of Dutch woodlice (Crustacea: Isopoda: Oniscidea). An updated checklist for the terrestrial isopods of The Netherlands is presented. Four species, Armadillo officinalis, Eluma purpurascens, Miktoniscus patiencei, and Trichoniscoides sarsi are new to the woodlice fauna of The Netherlands co

  2. Cavernicolous And Terrestrial Decapod Crustacea From Northern Sarawak, Borneo

    NARCIS (Netherlands)

    Holthuis, L.B.

    1979-01-01

    During the 1977-1978 Royal Geographical Society Mulu (Sarawak) Expedition a number of Decapod Crustacea was obtained. Some were collected by Mr. Philip Chapman in the course of studies of the invertebrates of the limestone caves in the Gunong Mulu National Park, 4th Division of Sarawak, and the Niah

  3. Two new species of Tridentella (Crustacea: Isopoda: Tridentellidae) from Namibia

    NARCIS (Netherlands)

    Brandt, Angelika; Poore, Gary C.B.

    2001-01-01

    Tridentella namibia n. sp. and T. benguela n.sp. (Crustacea: Isopoda: Tridentellidae) are described from the shelf and slope off the coast of Namibia, south-western Africa. A key is provided to all the 16 species in the genus and distributional information tabulated.

  4. On Apanthuretta lathridia n. sp. (Crustacea, Isopoda, Anthuridea) from Cuba

    NARCIS (Netherlands)

    Wägele, Johann Wolfgang

    1982-01-01

    Apanthuretta lathridia n. sp. (Crustacea: Isopoda: Anthuridea), the fifth species of the genus Apanthuretta Wägele, is described from interstitial water of a Cuban beach. A high number of morphological similarities with Apanthuretta pori Wägele (Red Sea) is noted.

  5. Crescimento relativo de Macrobrachium acanthurus (Wiegmann, 1836 (Crustacea, Decapoda, Palaemonidae

    Directory of Open Access Journals (Sweden)

    Wagner Cotroni Valenti

    1989-04-01

    Full Text Available In this paper, the relative growth of Macrobrachium acanthurus (Wiegmann, 1836 (Crustacea, Decapoda, Palaemonidae, is presented; the cephalothorax length/abdominal length, telson length/abdominal length and abdominal length/total length relashionships were determined. The adjusted equations showed a isometric growth pattern. There are no changes in these relationships during the animals growth that may be significant in the maximization of the meat's profit.

  6. An annotated checklist of the Cladocera (Crustacea: Branchiopoda) of Colombia.

    Science.gov (United States)

    Kotov, Alexey A; Fuentes-Reinés, Juan M

    2015-01-01

    Based on the revision of available literature on the Colombian Cladocera (Crustacea: Branchiopoda), we present an annotated checklist, with taxonomical comments for all taxa recorded since the start of research on this group in the country in 1913. We have listed 101 valid taxa, of which most records belong to the Caribbean region of Colombia. The situation in Colombian Cladocera taxonomy is, at present, unfavorable for any realistic conclusions on biodiversity, ecology and biogeography. PMID:26624722

  7. Population structure, distribution and abundance patterns of the patagonian smoothhound Mustelus schmitti Springer, 1939 (Chondrichthyes, Elasmobranchii, Triakidae in the rio de La Plata and inner continental shelf , sw Atlantic ocean (34º30'-39º30'S

    Directory of Open Access Journals (Sweden)

    María Cristina Oddone

    2007-09-01

    Full Text Available A total number of 4824 Mustelus schmitti was sampled. Females ranged from 25 to 93 cm in spring and from 28 to 90 cm in summer. Males ranged from 34 to 82 and from 28 to 77 cm, respectively. Length composition of the population showed significant differences between spring and summer being females larger than males. Total length distribution did not show significant differences between cruises. Males density varied significantly between cruises while for the females no significant variation was observed. In the spring cruise, both sexes occurred at depths lower than 50 m. Females occurred in the whole area with adult occurrence only above 35°30'S. Mature males occurred throughout the area, immature males occurring in two trawls in Samborombón Bay. The summer cruise showed a discontinuous distribution of the species along the study area resulting in spatial segregation in two groups with immature females predominating in both of them.Um total de 4824 Mustelus schmitti foi amostrado. As fêmeas apresentaram comprimento total de 25-93 cm na primavera e 28-90 cm no verão enquanto os machos apresentaram 34-82 e de 28-77 cm, respectivamente. A composição de comprimentos da população mostrou diferenças significativas entre primavera e verão sendo as fêmeas maiores do que os machos. A distribuição de comprimento total não variou significativamente entre cruzeiros. A densidade variou significativamente entre cruzeiros nos machos sendo que a variação não foi expressiva nas fêmeas. No cruzeiro da primavera, ambos os sexos ocorreram em profundidades menores do que 50 m, as fêmeas ocorrendo em toda a área de estudo, as adultas somente acima da latitude 35°30'S. Os machos adultos foram observados em toda a área sendo que os imaturos somente em dois arrastos na Bahia de Samborombón. O cruzeiro de verão mostrou uma distribuição descontínua da espécie ao longo da área de estudo, resultando na segregação espacial em dois grupos, com

  8. Landpissebedden van de Ooijpolder: deel 1. verspreiding (Crustacea: Isopoda: Oniscidea)

    OpenAIRE

    Wijnhoven, H.

    2000-01-01

    Terrestrial isopods of the Ooijpolder: part 1. distribution (Crustacea: Isopoda: Oniscidea) The distributions and habitats of woodlice were investigated in ‘the Ooijpolder’, also named ‘the Ooij’. The area of approximately 41 square kilometers is located along the river Waal, east of Nijmegen, Province of Gelderland, The Netherlands (fig. 2). In total 1464 squares of 100 x 100 m (utm) (fig. 9) were sampled by hand from 1991 up to 1998 (Table 1). On a recording form (fig. 5) five first order h...

  9. 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.

    Sciences Vol. 31(1), March 2002, pp. 78-80 Short Communication Breeding biology of shrimp Parapenaeopsis stylifera (Milne Edwards) (Crustacea: Decapoda) along the Neendakara zone, SW coast of India V Sunil* & H Suryanarayanan Department... of this species have also been studied 3,4 . However, the stages of maturity and its relationship with go- nado-somatic index and fecundity of P.stylifera (Milne Edwards) (Crustacea: Decapoda) has not been elucidated. Therefore the present study was conducted...

  10. Porcellium conspersum, een in Nederland zeer zeldzame landpissebed van vochtige bossen (Crustacea: Isopoda: Oniscoidea)

    NARCIS (Netherlands)

    Soesbergen, M.

    1999-01-01

    The influence of recent inundations on the distribution pattern of the isopod Eluma purpurascens in the province of Zeeland (Crustacea: Isopoda: Oniscoidea) Small scale mapping of Eluma purpurascens Budde-Lund, 1885 in the province of Zeeland revealed a remarkable distribution pattern. The species p

  11. Hyloniscus riparius: een lang onopgemerkte landpissebed in Nederland (Crustacea, Isopoda: Trichoniscidae)?

    NARCIS (Netherlands)

    Wijnhoven, H.

    1993-01-01

    Hyloniscus riparius: an unnoticed terrestrial wood-louse in the Netherlands (Crustacea, Isopoda: Trichoniscidae) ? Until recently Hyloniscus riparius was only recorded from The Netherlands from green-houses in the Botanical Garden at Utrecht. More recently material was collected in the Ooy Polder. I

  12. Description of Monodanthura maroccana nov. gen., nov.spec. (Crustacea, Isopoda, Anthuridea)

    NARCIS (Netherlands)

    Wägele, Johann Wolfgang; Platvoet, Dirk

    1982-01-01

    Monodanthura is a new genus of the family Anthuridae (Crustacea: Isopoda: Anthuridea) closely related to Notanthura Monod, 1927. The new species M. maroccana proves that Notanthura is not synonymous with Haliophasma Haswell, 1881. ”Cyathura” liouvillei Monod, 1925, is closely related to the new spec

  13. A new genus and species of Heteromysini (Crustacea- Mysidacea) from the backwater of Kochi (Kerala, India)

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.; Buju, A.

    Order] At: 10:52 24 October 2007 A new genus and species of Heteromysini (Crustacea- Mysidacea) from the backwater of Kochi (Kerala, India) S.U. PANAMPUNNAYIL & A. BIJU National Institute of Oceanography, Regional Centre, Kochi, India (Accepted 3 May... 2007) Abstract Kochimysis pillaii, a new genus and species of Heteromysini collected from the backwater of Kochi, is described. The new genus is closely related to the genus Deltamysis but is distinguishable from the latter by the following characters...

  14. Phylogenetic relationships within the Mysidae (Crustacea, Peracarida, Mysida) based on nuclear 18S ribosomal RNA sequences

    OpenAIRE

    Remerie, T.; Bulckaen, B.; Calderon, J; Deprez, T.; Mees, J.; J. Vanfleteren; Vanreusel, A.; Vierstraete, A; Vincx, M.; Wittmann, K.J.; Wooldridge, T.

    2005-01-01

    Species of the order Mysida (Crustacea, Peracarida) are shrimp-like animals that occur in vast numbers in coastal regions of the world. The order Mysida comprises 1053 species and 165 genera. The present study covers 25 species of the well-defined Mysidae, the most speciose family within the order Mysida. 18S rRNA sequence analysis confirms that the subfamily Siriellinae is monophyletic. On the other hand the subfamily Gastrosaccinae is paraphyletic and the subfamily Mysinae, represented in t...

  15. Ecomorfologia de caranguejos e siris (Crustacea Decapoda Brachyura) de ecossistemas costeiros

    OpenAIRE

    Marochi, Murilo Zanetti

    2012-01-01

    Resumo: Ecomorfologia de caranguejos e siris (CRUSTACEA DECAPODA BRACHYURA) de ecossistemas costeiros. O presente estudo objetivou avaliar se diferentes espécies de Brachyura possuem padrões ecomorfológicos em comum ligados ao habitat em que estão inseridas. Foram analisados 528 exemplares pertencentes a 24 espécies e provenientes dos seguintes ecossistemas costeiros: manguezal, costão rochoso, praia arenosa, bentopelagial e mar aberto. De todos os exemplares foram mensurada...

  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.

    of Marine Sciences Vol. 29, June 2000, pp. 179-180 Short Communication Growth of hatchery raised banana shrimp Penaeus merguiensis (de Man) (Crustacea:Decapoda) juveniles under different salinity Christina M. Saldanha* & C T Achuthankutty Aquaculture... (8.5 times the initial weight in 4 weeks). The results indicate that this species is suitable for cultivation in high saline waters. Biology of any aquatic organism is profoundly influenced by several abiotic factors and its distribution in any...

  17. Hurdles in investigating UVB damage in the putative ancient asexual Darwinula stevensoni (Ostracoda, Crustacea)

    OpenAIRE

    Van den Broecke, Lynn; Vanfleteren, Jacques; Martens, Koen; SCHON, Isa

    2013-01-01

    Ostracoda or mussel-shrimps are small, bivalved Crustacea. Because of their excellent fossil record and their broad variety of reproductive modes, ostracods are of great interest as a model group in ecological and evolutionary research. Here, we investigated damage and repair from one of the most important biological mutagens, namely UVB radiation, in the putative ancient asexual ostracod Darwinula stevensoni from Belgium. We applied three different methods: the Polymerase Inhibition (PI) ass...

  18. OCCURRENCE OF Charybdis hellerii (Milne Edwards, 1867 (CRUSTACEA, DECAPODA, PORTUNIDAE IN AN AMAZONIAN ESTUARY.

    Directory of Open Access Journals (Sweden)

    Alessandra Batista Bentes

    2013-12-01

    Full Text Available For the first time specimens of Charybdis hellerii (Milne Edwards 1867, an Indo Pacific specie, were caught in Amazon estuary, Bragança, Pará, North of Brazil. Palavras-chave: Crustacea, Charybdis hellerii , Amazonian Estuary. DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v3n3p181-184

  19. Macroepizoísmo em Libinia ferreirae (Crustacea, Brachyura, Majidae Macroepizoites on Libinia ferreirae (Crustacea, Brachyura, Majidae

    Directory of Open Access Journals (Sweden)

    Vanessa C. Winter

    2006-06-01

    Full Text Available Um estudo de distribuição dos macroepizóicos foi realizado numa população do caranguejo-aranha Libinia ferreirae Brito Capello, 1871 proveniente do litoral dos estados do Paraná e de Santa Catarina. O material biológico foi obtido junto aos pescadores, e faz parte do rejeito de pesca. Os caranguejos foram mensurados e os macroepizóicos identificados e contados. Os seguintes macroepizóicos sésseis foram registrados: Calliactis tricolor (Lesueur, 1817 (Cnidaria; Actiniaria (Cnidaria; Arca sp. (Mollusca; Ostreidae (Mollusca; Acanthodesia tenuis (Desor, 1848 (Bryozoa; Cirripedia e duas espécies tubícolas de Gammaridea (Crustacea. Além destes organismos ocorreram dois tubos desabitados e quatro animais vágeis. A anêmona C. tricolor foi a espécie mais abundante e freqüente, sendo, provavelmente, utilizada como mecanismo de camuflagem pelo caranguejo. O macroepizoísmo em L. ferreirae está relacionado com a idade ou tamanho do caranguejo, tendo maior incidência naqueles mais velhos ou de maior porte. Entretanto, a densidade dos macroepizóicos por caranguejo se mantém em torno de três. Não há relação entre o macroepizoísmo e o sexo do hospedeiro; somente fêmeas ovígeras utilizam desse recurso mais freqüentemente do que as não-ovígeras. Devido à maior área de fixação, os macroepizóicos colonizam principalmente a carapaça do caranguejo, enquanto nos pereiópodos há predominância de Bryozoa.A study of the distribution of the macroepizoites was carried out on a population of the spider crab Libinia ferreirae Brito Capello, 1871 from the Southern Brazilian coast. Crabs were obtained from shrimps and fishes by-catch. They were measured, and their macroepizoites were identified and counted. The following sessile macroepizoites were registered: Calliactis tricolor (Lesueur, 1817 (Cnidaria; Actiniaria (Cnidaria; Arca sp. (Mollusca; Ostreidae (Mollusca; Acanthodesia tenuis (Desor, 1848 (Bryozoa; Cirripedia and two species

  20. 40 CFR 180.1071 - Peanuts, Tree Nuts, Milk, Soybeans, Eggs, Fish, Crustacea, and Wheat; exemption from the...

    Science.gov (United States)

    2010-07-01

    ... and greenhouse operations, as defined in 40 CFR 170.3, which includes seeding, potting and... 40 Protection of Environment 23 2010-07-01 2010-07-01 false Peanuts, Tree Nuts, Milk, Soybeans... Peanuts, Tree Nuts, Milk, Soybeans, Eggs, Fish, Crustacea, and Wheat; exemption from the requirement of...

  1. The authorship of the names of species of Crustacea Decapoda published in 1835 By S. Hailstone and J. O. Westwood

    NARCIS (Netherlands)

    Holthuis, L.B.

    1976-01-01

    The amateur naturalist S. Hailstone, who lived in Hastings, England, was much interested in the Crustacea of his area and made collections of these. At several occasions in 1834 and 1835 he sent observations on interesting specimens, often together with the material, to J. C. Loudon, the editor of "

  2. Vives, F. and A.A. Shmeleva. – 2006. Crustacea, Copépodos marinos I. Calanoida

    OpenAIRE

    Alcaraz, Miquel

    2007-01-01

    Book review of: Vives, F. and A.A. Shmeleva. – 2006. Crustacea, Copépodos marinos I. Calanoida. In: Fauna Ibérica, vol. 29. Ramos et al. (eds.), Museo Nacional de Ciencias Naturales, CSIC, Madrid. 1152 pp. ISBN: 84-00-07010-0 (for Fauna Ibérica); ISBN: 978-84-00-08515-5 (for volume 29). In Spanish.-- 2 pages

  3. Estimating population size of the cave shrimp Troglocaris anophthalmus (Crustacea, Decapoda, Caridea) using mark–release–recapture data

    OpenAIRE

    Jugovic, J.; Praprotnik, E.; Buzan, E. V.; Lužnik, M.

    2015-01-01

    Population size estimates are lacking for many small cave–dwelling aquatic invertebrates that are vulnerable to groundwater contamination from anthropogenic activities. Here we estimated the population size of freshwater shrimp Troglocaris anophthalmus sontica (Crustacea, Decapoda, Caridea) based on mark–release–recapture techniques. The subspecies was investigated in Vipavska jama (Vipava cave), Slovenia, with estimates of sex ratio and age distribution. A high abundance of shrimps was found...

  4. Adaptive strategies in populations of Chirocephalus diaphanus (Crustacea, Anostraca) from temporary waters in the Reatine Apennines (Central Italy)

    OpenAIRE

    Secondina DI GIUSEPPE; Giovanni FANCELLO; Graziella MURA

    2003-01-01

    To investigate the relationship between the adaptive strategies of Chirocephalus diaphanus (Crustacea, Anostraca) and the environmental characteristics of its habitat, we studied two populations living in high-altitude biotopes with very different characteristics, i.e. a semipermanent pool (Tilia Lake) and a temporary one (Illica Plain Pool), and we examined the essential features of their biological cycles (growth rate, reproductive biology, sex ratio and life cycle). The results show that t...

  5. Halomonhystera parasitica n. sp. (Nematoda: Monhysteridae), a parasite of Talorchestia brito (Crustacea: Talitridae) in Portugal.

    Science.gov (United States)

    Poinar, George; Duarte, Daniella; Santos, Maria João

    2010-01-01

    Halomonhystera parasitica n. sp. (Monhysterida: Monhysteridae) is described from the body-cavity and under the dorsal plates of the sandy beach amphipod Talorchestia brito Stebbing (Crustacea: Talitridae) in Portugal. The new species differs from previously described members of the genus by a combination of the following characters: four medium-sized cephalic setae; base of stoma with three blunt denticles; posterior dilated portion of stoma absent; amphids small, with width less than quarter of corresponding body width; amphids located less than two labial widths from anterior extremity; uterine eggs elliptical and unembryonated; gubernaculum lacks caudal process; and male tail with two separated pairs of postcloacal papillae and a single subterminal seta-like papilla. This is the first representative of the family Monhysteridae parasitic in the body-cavity of crustaceans. Approximately 48% of the amphipods examined contained various stages of H. parasitica. PMID:20012518

  6. Reference values for feeding parameters of isopods (Porcellio scaber, Isopoda, Crustacea

    Directory of Open Access Journals (Sweden)

    Damjana Drobne

    2014-11-01

    Full Text Available The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellio scaber (Isopoda, Crustacea in laboratory-controlled experiments. In the work presented here, the daily feeding rate of the central 50% of the control population of P. scaber and a correlation between feeding rate and isopod weight were set. Values outside these ranges need additional evaluation to increase the relevance of test outcomes. We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a to identify animals with altered feeding parameters with respect to controls, and (b to assess the data quality in each experiment.

  7. The complete mitogenome of blue swimming crab Portunus pelagicus Linnaeus, 1766 (Crustacea: Decapoda: Portunidae).

    Science.gov (United States)

    Meng, Xian-Liang; Jia, Fu-Long; Liu, Ping; Li, Jian

    2016-07-01

    The complete mitochondrial genome (mitogenome) of the blue swimming crab Portunus pelagicus Linnaeus, 1766 (Crustacea: Decapoda: Portunidae) was determined in this study. The full length mitogenome is 16 157 bp in size, and consists of 13 protein-coding genes, 22 tRNA genes, two rRNA genes, and a non-coding control region, with the base composition of 33.70% for A, 18.99% for C, 12.22% for G, and 35.09% for T. The gene order of P. pelagicus mainly retains as the pancrustacean ground pattern, except for a single translocation of tRNA(His) gene. The mitogenome data provide a basis for further studies on population genetics and phylogenetics. PMID:26171873

  8. Investigations on the metabolism of metals in decapod crustaceas in relation with moulting cycles and reproduction

    International Nuclear Information System (INIS)

    A study of the metabolism of metals was carried out in decapod crustaceas; it showed that it was subject to cyclic variations during the life of the animals, closely correlated with growth moults. The metabolism of metals was also considered in its relations with reproduction, especially oogenesis and spermatogenesis, and embryonic development. In relation with moult, various factors playing a role on metal metabolism were investigated: role of metals in the organism, fasting and nutrition cycles and biochemical reserves, physico-chemical form of the metal and ultrastructure of uptake surfaces. The histological and histochemical aspects of the uptake of a number of metals were studied as well as inter-metallic and inter-organic relationships

  9. Composition and seasonal variation of brachyura and anomura (Crustacea, Decapoda associated with brown mussel farms at Praia da Cocanha, Brazil

    Directory of Open Access Journals (Sweden)

    Ligia Coletti Bernadochi

    2012-08-01

    Full Text Available The composition and seasonal variation of brachyuran and anomuran species associated with mussel farms were evaluated at Praia da Cocanha, São Paulo between May 2007 and February 2008. Nine mussel ropes were sampled at random in each quarter, and 1,208 organisms were identified, comprising five families and 28 species. The most numerous species was the porcellanid Pachycheles laevidactylus (18.5%, followed by the xanthids Acantholobulus schmitti (16.6%, Hexapanopeus paulensis (11.3%, Panopeus americanus (10.2%, and Menippe nodifrons (8.4%. The exotic crab Charybdis hellerii was recorded throughout the study period. The ecological descriptors, except Pielou evenness index, varied significantly over the time. The highest abundance and diversity of the species were recorded during November and February. This pattern was reversed for Berger-Parker dominance, with the lowest values recorded in February. The development of epifauna was correlated with the different stages of the mussel farms, since the mean size of mussels and consequently the abundance of epibiotic organisms and the structural complexity on the mussel ropes increased from May (seeding until February (harvest. Despite this, the temporal population variations in recruitment patterns of the different epibionts should not be overlooked. The results indicated that the mussel farms provided favorable conditions for the development of these crustacean groups, which could be used in environmental monitoring programs and / or be exploited for the aquarium trade.

  10. Los pandalidae (crustacea: caridea) del pacífico mexicano, con una clave para su identificación

    OpenAIRE

    Hendrickx, Michel E.; Mary K. Wicksten

    2012-01-01

    Diez especies de Pandalidae (Crustacea: Caridea) se encuentran en las aguas del Pacífico  mexicano, de las cuales dos (Plesionika trispinus y Stylopandalus richardi) se colectaron por primera vez en México. Se presenta la información actualizada acerca de la distribución geográfica y batimétrica de las especies, así como una clave de identificación de estas. La fauna de camarones Pandalidae del Pacífico mexicano es pobre, ya que representa menos del 10% de las especies conocidas. Ocho de las ...

  11. Photon activation analysis of trace elements in several kinds of invertebrate animals. 1. Arthropoda crustacea

    International Nuclear Information System (INIS)

    Quantitative analysis of trace elements was made for marine mollusca by light quantum activation method. Crustacea which is likely to be well reflecting the environment of ocean floor was used as the subjects. Various kinds of these animals including Carcinus Portunus. Palinurus, Panulirus, Squilla etc. were collected from the sea off Japan to determine the concentrations of 15 kinds of elements in the gills, muscles, head/thorax region and viceraneous organs. The concentration of As was found markedly high in either of gills, muscles or viceraneous organs of Palinurus taken from the sea near Okinawa. It was found that there are no difference in the concentrations of As, Fe, Mn and Pb among the species studied and Fe, Mn and Pb were detected at high levels in the gills of Carcinus, whereas the Fe and Mn concentrations in the gills of Palinurus were considerably lower than other species tested. Thus, the element concentration was different among the regions studied and also species. (M.N.)

  12. The summer assemblage of large pelagic Crustacea in the Gully submarine canyon: Major patterns

    Science.gov (United States)

    MacIsaac, K. G.; Kenchington, T. J.; Kenchington, E. L. R.; Best, M.

    2014-06-01

    We describe the trawl-vulnerable crustacean micronekton and macrozooplankton of the Gully, a large, shelf-incising submarine canyon off Nova Scotia, Canada, and a Marine Protected Area. Over 68 species of pelagic crustacea were collected with an International Young Gadoid Pelagic Trawl during three annual summer surveys at one fixed station in the canyon. Depths sampled ranged from the surface to the upper bathypelagic zone, concentrated in the upper 1250 m, with a maximum depth of 1500 m. The crustacean fauna was dominated by cold temperate species typical of mid- to higher-latitudes in the North Atlantic. Meganyctiphanes norvegica and Eusergestes arcticus were particularly dominant in terms of both observed biomass and abundance above 750 m depth. At least 17 species were new records for Canadian waters. The species assemblage of the station varied primarily with depth and diel cycle, the only dominant members of the assemblage showing pronounced inter-annual variations in catch being M. norvegica and Themisto gaudichaudii, both relatively shallow living species.

  13. Effects of landfill leachate treatment on hepatopancreas of Armadillidium vulgare (Crustacea, Isopoda).

    Science.gov (United States)

    Manti, Anita; Canonico, Barbara; Mazzeo, Roberto; Santolini, Riccardo; Ciandrini, Eleonora; Sisti, Davide; Rocchi, Marco Bruno Luigi; Nannoni, Francesco; Protano, Giuseppe; Papa, Stefano

    2013-11-01

    The major environmental impact of landfills is emission of pollutants via the leachate and gas pathways. The hepatopancreas of the terrestrial isopod Armadillidium vulgare (Isopoda, Crustacea, Latreille 1804) plays an important role in the bioaccumulation of contaminants, such as heavy metals. To evaluate the effects of landfill leachate treatment, 2 different approaches were applied: 1) the detection of accumulation of trace elements (As, Cd, Cr, Cu, Sb, Zn, Pb, Ni, V) in hepatopancreatic cells, and 2) the evaluation of biological effect of contaminants on fresh hepatopancreatic cells by flow-cytometric analyses. The presence of 2 different cell types (herein referred to as "small" [S] cells and "big" [B] cells, in agreement with the literature based on morphological examinations) was detected for the first time by flow cytometry, which also highlighted their different response to stress stimuli. In particular, B cells appeared more sensitive to landfill leachate treatment, being more damaged in the short term, while S cells seemed more adaptive. Furthermore, S cells could represent a pool from which they are able to differentiate into B cells. These findings were also confirmed by principal component analyses, underlining that S SYBR Green I bright cells correlate with specific chemicals (Ca, Cu, Co), confirming their resistance to stress stimuli, and suggesting that the decrease of specific cell types may prime other elements to replace them in a homeostasis-preservation framework. PMID:23929682

  14. Evasion of predators contributes to the maintenance of male eyes in sexually dimorphic Euphilomedes ostracods (Crustacea).

    Science.gov (United States)

    Speiser, Daniel I; Lampe, Rebecca I; Lovdahl, Valerie R; Carrillo-Zazueta, Brenna; Rivera, Ajna S; Oakley, Todd H

    2013-07-01

    Sexual dimorphisms have long drawn the attention of evolutionary biologists. However, we still have much to learn about the evolutionary, genetic, and developmental drivers of sexual dimorphisms. Here, we introduce ostracods of the genus Euphilomedes (Myodocopida, Ostracoda, and Crustacea) as a promising new system in which to investigate why and how sexual dimorphisms evolve. First, we ask whether male-skewed selective pressure from pelagic predators may help explain a dramatic sexual dimorphism in which male Euphilomedes have compound eyes, but females do not. Manipulative experiments demonstrate that blindfolding reduces the survival rate of male Euphilomedes when they are exposed to predatory fish. Blindfolding of the female rudimentary eyes (rudiments) does not, however, similarly influence the survival rate of brooding females. Further, numerical estimates of sighting distances, based on reasonable extrapolations from Euphilomedes's eye morphology, suggest that the eyes of male Euphilomedes are useful for detecting objects roughly the size of certain pelagic predators, but not conspecifics. We conclude that eyes do not mediate direct interactions between male and female Euphilomedes, but that differences in predation pressure-perhaps associated with different reproductive behaviors-contribute to maintaining the sexually dimorphic eyes of these ostracods. Second, through transcriptome sequencing, we examined potential gene regulatory networks that could underlie sexual dimorphism in Euphilomedes' eyes. From the transcriptome of juvenile male Euphilomedes' eyes, we identified phototransduction genes and components of eye-related developmental networks that are well characterized in Drosophila and other species. The presence of suites of eye regulatory genes in our Euphilomedes juvenile male transcriptome will allow us, in future studies, to test how ostracods regulate the development of their sexually dimorphic eyes. PMID:23652199

  15. Food ingestion and assimilation by Hyaie media (Dana, 1853 (Crustacea - Amphipoda

    Directory of Open Access Journals (Sweden)

    Airton Santo Tararam

    1990-06-01

    Full Text Available The feeding of Hyale media was analysed under laboratory conditions in winter and summer temperatures. The results showed that assimilation rates increased following food ingestion rates and decreased when egestion rates increased. In winter temperatures no significant differences were found in the assimilation rates among developmental stages and sexes. In summer temperatures assimilation rates for ovigerous and non-ovigerous females were higher than those found for adult and young males. Although not statistically analysed, mean assimilation efficiencies were highest among ovigerous females and adult males, in summer. The quantitative and qualitative variations found in the assimilation efficiency and rates were explained by the differential effect of temperature on the specific growth rate and in the physiological conditions of each growth stage concerned.No presente estudo foram analisados em laboratório, sob temperaturas de inverno e verão, aspectos quantitativos da alimentação de Hyale media (Crustacea-Amphipoda, utilizando-se o método gravimetría, aliado ao conteúdo de carbono dos itens alimentares oferecidos. Nos experimentos com temperatura de inverno não foi encontrado diferença significativa nas taxas de assimilação entre os diferentes estádios de desenvolvimento e sexo. Naqueles com temperatura de verão as taxas de assimilação para fêmeas ovígera e não ovígera foram maiores que aquelas encontradas para machos adulto e jovem. As variações encontradas nas taxa e eficiência de assimilação foram explicadas pelo efeito diferencial da temperatura sobre a taxa de crescimento específico e condições fisiológicas de cada estádio de desenvolvimento.

  16. Phenotypic plasticity in the Idotea baltica basteri (Crustacea, Isopoda sex ratio in Odessa bay, Black Sea

    Directory of Open Access Journals (Sweden)

    A. Y. Varigin

    2014-03-01

    Full Text Available The degree of phenotypic plasticity in the Idotea baltica basteri Audouin, 1827 (Crustacea, Isopoda sex ratio of the fouling community in the Odessa bay of the Black Sea was determined. The ratio of males and females in three main phenotypes of I. baltica basteri, namely: uniformis, albafusca and lineata was found. Crustaceans were collected on the underwater surface of traverses, located in three sea districts with the different degrees of water exchange intensity with the open sea. Water depth at the wall of traverses ranged from 1 to2,5 m. In the first most opened district among the individuals of uniformis phenotype the ratio of males and females was equal to 1:4, that for albafusca – 1:1,3 and lineata – 1:1. In the second area with the release of drainage waters among the individuals of uniformis phenotype this ratio was equal to 1:4,5, while the albafusca and lineata figures were 1:1,5 and 1:1, accordingly. In the third region, with the most difficult water exchange, among the individuals of phenotypes the ratios of males and females were as follows: uniformis – 1:8, albafusca – 1:2, and lineata – 1:1. When moving from the opened to semi-enclosed area among the individuals of all phenotypes there was a gradual decline in the proportion of males and accordingly, increases of the proportion of females. The greatest number of males in all areas under study is observed among the individuals of lineata phenotype, and that of females – among the individuals of uniformis phenotype. It is found that monochromatic colored females prefer to stay in the shaded places among the seagrass beds and brightly colored males usually move actively along the outside of the substrata.

  17. Parthenogenetic reproduction of Diaphanosoma celebensis (Crustacea: Cladocera). Effect of algae and algal density on survival, growth, life span and neonate production

    Digital Repository Service at National Institute of Oceanography (India)

    Shrivastava, Y.; Mahambre, G.G.; Achuthankutty, C.T.; Fernandes, Brenda; Goswami, S.C.; Madhupratap, M.

    been reported to occur suddenly after a series of parthenogenetic gener- ations (Zhong et al. 1989). In the present study also, three sexual males were encountered during the later part of the study while being mass reared. Studies have been initiated... the life span of females. However, long-term feeding experiments revealed that the percentage survival was high with I. galbana and low with C. cal- citrans. Introduction Diaphanosoma celebensis (Crustacea:Cladocera:Sididae) is a low to medium saline...

  18. Non-target effects of the insecticide methoprene on molting in the estuarine crustacean Neomysis integer (Crustacea: Mysidacea)

    OpenAIRE

    Ghekiere, A.; Verslycke, T.; Fockedey, N.; Janssen, C.R.

    2006-01-01

    Ecdysteroids, the molting hormones in crustaceans and other arthropods, play a crucial role in the control of growth, reproduction and embryogenesis of these organisms. Insecticides are often designed to target specific endocrine-regulated functions such as molting and larval development such as methoprene, a juvenile hormone analogue.The aim of this study was to examine the effects of methoprene on molting in a non-target species, the estuarine mysid Neomysis integer (Crustacea: Mysidacea). ...

  19. Cellular energy allocation and scope for growth in the estuarine mysid Neomysis integer (Crustacea: Mysidacea) following chlorpyrifos exposure: a method comparison

    OpenAIRE

    Verslycke, T.; Roast, S.D.; Widdows, J.; Jones, M B; Janssen, C. R.

    2004-01-01

    Mysids (Crustacea: Mysidacea) are used routinely in acute toxicity testing to evaluate the comparative toxicity of chemicals to aquatic organisms. The need for sublethal endpoints that provide comprehensive understanding of the potential impacts of toxicants to natural populations has resulted in examination of several physiological responses in mysid shrimp, including scope for growth (SFG) and cellular energy allocation (CEA). Both assays, based on the concept that energy in excess of that ...

  20. The complete mitogenome of the Atlantic hydrothermal vent shrimp Rimicaris exoculata Williams & Rona 1986 (Crustacea: Decapoda: Alvinocarididae).

    Science.gov (United States)

    Yu, Yan-Qin; Liu, Xiao-Li; Li, Hua-Wei; Lu, Bo; Fan, Yu-Peng; Yang, Jin-Shu

    2016-09-01

    In this study we completely determined and analyzed the mitochondrial genome of the Mid-Atlantic Ridge hydrothermal-vent shrimp Rimicaris exoculata (Crustacea: Decapoda: Alvinocarididae). The circular molecule is 15,902 bp in size with an AT content of 65.7%, composed of the same 37 mitochondrial genes as in all other known metazoan mitogenomes. Sequence composition of the R. exoculata mitogenome is exceptionally similar to that of its Indian-Ocean congener R. kairei, which suggests the fact that they might diverge at a quite recent age. The genome exhibits an ancestral pancrustacean arrangement of mitochondrial genes that presents only the translocation/inversion of trnL-UUR from the ancestral arthropod pattern. Determination of the R. exoculata mitogenome can help to resolve the consensus Decapoda tree of life. It also provides more genetic information available for phylogenetics as well as population genetics on this extensively studied species from hydrothermal vents. PMID:25665594

  1. Estudios sobre los Entomostráceos de Colombia.V. Limnadia Orinoquiensis, una nueva especie de la familia Limnadiidae Sars, 1896 (Arthropoda, Crustacea, Conchostraca Estudios sobre los Entomostráceos de Colombia.V. Limnadia Orinoquiensis, una nueva especie de la familia Limnadiidae Sars, 1896 (Arthropoda, Crustacea, Conchostraca

    Directory of Open Access Journals (Sweden)

    Roessler Ewald W.

    1991-06-01

    Full Text Available En el presente estudio se describen rasgos morfológicos de una nueva especie colombiana del género Limnadia Brongniart, 1820, Limnadia orinoquiensis (Arthropoda, Crustacea, Conchostraca. La forma es de reproducción bisexual y típica para las aguas ácidas y oscuras de los alrededores de Puerto Inírida, Comisaria del Guainía. The present study describes morfological features of a new colombian species of the genus Limnadia Brongniart, 1820, Limnadia orinoquiensis (Arthropoda, Crustacea, Conchostraca, a species of bisexual reproduction, typical to the dark waters of temporary pools in the surroundings of Puerto Inírida, Comisaria of Guainía.

  2. Cangrejos estuariales del Atlántico sudoccidental (25º-41ºS (Crustacea: Decapoda: Brachyura Crabs of coastal lagoons in the southwestern Atlantic (25º-41ºS (Crustacea: Decapoda: Brachyura

    Directory of Open Access Journals (Sweden)

    Eduardo D. Spivak

    1997-01-01

    Full Text Available Se compara la fauna de decápodos y las características ambientales de varios estuarios y lagunas costeras del Atlántico sudoccidental, ubicados entre los 25 y los 41°S: Baia de Paranaguá, Manguezal de Itacorubí, Lagoa dos Patos (Brasil, Laguna Castillos (Uruguay, Río de la Plata (Uruguay-Argentina, Laguna Mar Chiquita y Bahía Blanca (Argentina. Se revisa la información sobre historia natural de las especies de cangrejos (Crustacea: Brachyura que los habitan. El número de especies de cangrejos desciende bruscamente entre Itacorubí y Lagoa dos Patos, junto a la disminución de la temperatura mínima del agua. Las bajas temperaturas invernales tienen un efecto directo sobre la fisiología de muchas especies, pero también están relacionadas con la desaparición de los manglares y la variedad de microhabitat que éstos generan. Sin embargo, el efecto de la temperatura no es suficiente para explicar algunos aspectos relacionados con la distribución de las especies y sus historias de vidaEnvironmental aspects and the decapod fauna of several estuaries and coastal lagoons in the southwestern Atlantic, between 25 and 41°S, are compared: Baia de Paranaguá, Manguezal de Itacorubí, Lagoa dos Patos (Brasil, Laguna Castillos (Uruguay, Río de la Plata (Uruguay-Argentina, Laguna Mar Chiquita and Bahía Blanca (Argentina. The information about natural history of crab species (Crustacea: Brachyura from these estuarine systems is reviewed. The number of crab species falls dramatically between Itacorubí and Lagoa dos Patos, together with a fall in minimum water temperature. Low winter temperatures may affect physiological processes of many species and are related to the disappearance of mangroves, and the variety of microhabitat generated by them. However, temperature alone cannot explain several features of species distribution and life history

  3. Evaluation of the haematological parameters in Piaractus mesopotamicus Holmberg (Osteichthyes, Characidae with Argulus sp. (Crustacea, Branchiura infestation and treatment with organophosphate

    Directory of Open Access Journals (Sweden)

    Marcos Tavares-Dias

    1999-06-01

    Full Text Available Haematological parameters as erythrocytes, leukocytes and plasma glucose in Piaractus mesopotamicus Holmberg, 1887 were analyzed. Fish were parasitized with Argulus sp. (Crustacea, Branchiura and treated with 0.4 mg of thriclorphon 500/L water. The effects of parasitism and the action of the treatment were evaluated. Parasitized fish showed greater number of monocytes (P>0.05 and special granulocitic cells (P0.05. Organophosphate treatment presented significantly reduction (P>0.05 in red blood cells (RBC and hemoglobin.

  4. Radioisotope excited X-ray fluorescence analysis of Asellus Aquaticus (Crustacea: Isopoda) from Istanbul as an indicator of environmental metal pollution

    International Nuclear Information System (INIS)

    Some metal contents of the freshwater isopod: Asellus aquaticus (Crustacea: Isopoda), collected form the pool of the botanical garden of Istanbul University (at the vicinity of old city center of Istanbul), were analysed, in order to investigate urban metal pollution. The analysis of the homogenized sample of isopods indicated that it contained K, Ca, Mn, Fe, Cu, Ni, Zn, Pb, Br, Rb, Sr, Y, Zr, Ba, Cd, Cs and Hg in different amounts. The results were compared with those of other isopods and various organisms. (author)

  5. Testosterone metabolism in the estuarine mysid neomysis integer (Crustacea; Mysidacea): identification of testosterone metabolites and endogenous vertebrate-type steroids.

    Science.gov (United States)

    Verslycke, Tim; De Wasch, Katia; De Brabander, Hubert F; Janssen, Colin R

    2002-04-01

    Testosterone metabolism by Neomysis integer (Crustacea; Mysidacea) was assessed to obtain initial data on its metabolic capacity. N. integer were exposed to both testosterone and [(14)C]testosterone. Identification of testosterone metabolites and endogenous steroids was performed using thin-layer chromatography and liquid chromatography with multiple mass spectrometry. Endogenous production of testosterone in mysids was detected for the first time. N. integer were exposed to testosterone and metabolized administered testosterone extensively. At least 11 polar testosterone metabolites (R(f,metabolite) sex-specific testosterone metabolism was also observed, although this observation requires further confirmation. The anabolic steroid beta-boldenone was also identified for the first time in invertebrates. The metabolic pathway leading to the formation of beta-boldenone remains unknown, since the steroidal precursor androstadienedione could not be detected. These results reveal interesting similarities in enzyme systems in invertebrate and vertebrate species. Alterations in steroid hormone metabolism may be used as a new biomarker for the effects of endocrine disruptors in invertebrates. PMID:12030775

  6. Grandes branquiópodos (Crustacea, Branchiopoda, Anostraca, Notostraca en la provincia de Málaga, España (año hidrológico 2012/2013

    Directory of Open Access Journals (Sweden)

    Ripoll Rodríguez, J.

    2014-03-01

    Full Text Available Large branchiopods (Crustacea, Branchiopoda, Anostraca, Notostraca from Málaga province, Spain (2012/2013 hydrological year This paper presents the occurrence of the large branchiopods detected during a survey carried out in the province of Málaga (Andalusia, southern Spain. Five species (Branchipus cortesi, Chirocephalus diaphanus, Streptocephalus torvicornis, Triops mauritanicus aggr. and Phallocryptus spinosa were recorded at 90 sampled wetlands.

  7. 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.

  8. Espécies de Cladonia P. Browne (Cladoniaceae, Ascomycota dos Supergrupos Cocciferae, Crustaceae e Perviae em restingas e costões rochosos dos estados do Paraná e de Santa Catarina, Brasil Species of Cladonia P. Browne (Cladoniaceae, Ascomycota, of Supergroup Cocciferae, Crustaceae and Perviae, from restinga vegetation and rocky shores of Paraná and Santa Catarina, Brazil

    Directory of Open Access Journals (Sweden)

    Emerson Luiz Gumboski

    2012-09-01

    Full Text Available Pouco se conhece das espécies de Cladonia que ocorrem nos estados do Paraná e de Santa Catarina. Informações sobre a ocorrência de liquens em restingas são muito escassas e não há qualquer registro para costões rochosos. O objetivo do trabalho foi realizar um levantamento intensivo das espécies de Cladonia presentes em áreas de restingas e costões rochosos presentes nos estados do Paraná e de Santa Catarina, sul do Brasil. Foram encontradas nove espécies pertencentes aos Supergrupos Cocciferae, Crustaceae e Perviae, sendo que Cladonia squamosa é nova citação para o Paraná e C. palmicola para Santa Catarina. Todas as espécies encontradas ocorrem em restingas e sete delas também em costões rochosos. São apresentadas chave de identificação, descrições, comentários e ilustrações.Little is known about the species of Cladonia that occur in the states of Paraná and Santa Catarina, in southern Brazil. Information about the occurrence of lichens in restinga (a type of coastal vegetation in Brazil is very scarce and there are no records from rocky shores. The main goal of the present work was to make an intensive survey of Cladonia species that grow in restinga and on the rocky shores of this region. Nine species belonging to Supergroups Cocciferae, Crustaceae and Perviae were found, and two of them were new records: Cladonia squamosa for Paraná and C. palmicola for Santa Catarina. All of the species recorded occur in restinga and seven of them are also found along rocky shores. An identification key, descriptions, comments and illustrations are provided.

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

    Directory of Open Access Journals (Sweden)

    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

  10. Evaluation of the floating time of a corpse found in a marine environment using the barnacle Lepas anatifera L. (Crustacea: Cirripedia: Pedunculata).

    Science.gov (United States)

    Magni, Paola A; Venn, Cynthia; Aquila, Isabella; Pepe, Francesca; Ricci, Pietrantonio; Di Nunzio, Ciro; Ausania, Francesco; Dadour, Ian R

    2015-02-01

    Human activities involving water may result in a crime scene. Typically, death may be due to natural causes, homicide, or mass disasters. Decomposition in water is a complex process where many factors may interplay. Human remains in water are subject to many potential interactions, depending upon the remains themselves, the type of water and the characteristics of the water. A number of studies are focused on the decomposition process of the corpse in water, on the identification of the post mortem submersion interval (PMSI) and on the diagnosis of drowning, but very few studies consider the fate of floating remains in any aquatic environment. The following case describes a corpse found on a shore of the Tyrrhenian Sea (South West of Italy, Calabria Region). The corpse and the soles of his shoes were colonized by the barnacle Lepas anatifera L. (Crustacea: Cirripedia: Pedunculata). The analyses of the barnacles present on the corpse aided in the evaluation of the floating time of the corpse which assisted in estimating the minimum time since death. PMID:25538026

  11. On the presence of the Mediterranean endemic Microdeutopus sporadhi Myers, 1969 (Crustacea: Amphipoda: Aoridae in the Gulf of Naples (Italy with a review on its distribution and ecology

    Directory of Open Access Journals (Sweden)

    M. B. SCIPIONE

    2013-07-01

    Full Text Available The species Microdeutopus sporadhi (Crustacea: Amphipoda: Aoridae, endemic of the Mediterranean Sea, was described by Myers in 1969 on material collected from the Aegean Sea in a sheltered environment with high sedimentation rates. A check on the distribution and ecology of M. sporadhi showed that: — although not mentioned in the checklist of amphipods of the Italian seas, it was already found in the central Tyrrhenian Sea in 1983-84 and in the northern Adriatic Sea in 2002-03; — it was rarely found in the Mediterranean Sea, one of the most studied basins as concerns amphipod fauna; but notwithstanding the few records available, the wide ecological spectrum of this species was pointed out. The present study, conducted off the Island of Ischia (Gulf of Naples, Italy, showed the presence of rich and well established populations through time, but only in a peculiar substratum (artificial collectors and environment (low pH values. The species seems to be able to withstand harsh environmental conditions and probably to conceal itself through a cryptic behaviour, escaping traditional sampling methods. The role of rare or hidden species in bio-assessment should be re-evaluated.

  12. Hifalomicose em Mustelus schmitti (Springer (Chondrichthyes, Triakidae Hyphalomycosis in Mustelus schmitii (Springer (Chondrichthyes, Triakidae

    Directory of Open Access Journals (Sweden)

    Manoel Mateus Bueno Gonzalez

    1999-06-01

    Full Text Available Both fungai and algal infections have been reported in elasmobranchs. This study describes the first record of hyphalomycosis infection in Mustelus schmitii (Springer, 1940. The data was obtained through the examination of one animal in captivity and ninety five in their natural environment. Was also detected four cases of Fusarium solani infection. The impact of these diseases on the wild population is unknown.

  13. Alona iheringula Sinev & Kotov, 2004 (Crustacea, Anomopoda, Chydoridae, Aloninae): life cycle and DNA barcode with implications for the taxonomy of the Aloninae subfamily.

    Science.gov (United States)

    Silva, Erika dos Santos; de Abreu, Cínthia Bruno; Orlando, Tereza Cristina; Wisniewski, Célio; dos Santos-Wisniewski, Maria José

    2014-01-01

    Knowledge of reproductive rates and life cycle of the Cladocera species is essential for population dynamic studies, secondary production and food webs, as well as the management and preservation of aquatic ecosystems. The present study aimed to understand the life cycle and growth of Alona iheringula Kotov & Sinev, 2004 (Crustacea, Anomopoda, Chydoridae), a Neotropical species, as well as its DNA barcoding, providing new information on the Aloninae taxonomy. The specimens were collected in the dammed portion of the Cabo Verde River (21°26'05″ S and 46°10'57″ W), in the Furnas Reservoir, Minas Gerais State, Brazil. Forty neonates were observed individually two or three times a day under controlled temperature (25±1°C), photoperiod (12 h light/12 h dark) and feeding (Pseudokirchneriella subcapitata at a concentration of 105 cells.mL-1 and a mixed suspension of yeast and fish feed in equal proportion). Individual body growth was measured daily under optical microscope using a micrometric grid and 40× magnification. The species had a mean size of 413(±29) µm, a maximum size of 510 µm and reached maturity at 3.24(±0.69) days of age. Mean fecundity was 2 eggs per female per brood and the mean number of eggs produced per female during the entire life cycle was 47.6(±6.3) eggs per female. The embryonic development time was 1.79(±0.23) days and the maximum longevity was 54 days. The species had eight instars throughout its life cycle and four instars between neonate and primipara stage. The present study using molecular data (a 461 bp smaller COI fragment) demonstrated a deep divergence in the Aloninae subfamily. PMID:24878503

  14. Alona iheringula Sinev & Kotov, 2004 (Crustacea, Anomopoda, Chydoridae, Aloninae: life cycle and DNA barcode with implications for the taxonomy of the Aloninae subfamily.

    Directory of Open Access Journals (Sweden)

    Erika dos Santos Silva

    Full Text Available Knowledge of reproductive rates and life cycle of the Cladocera species is essential for population dynamic studies, secondary production and food webs, as well as the management and preservation of aquatic ecosystems. The present study aimed to understand the life cycle and growth of Alona iheringula Kotov & Sinev, 2004 (Crustacea, Anomopoda, Chydoridae, a Neotropical species, as well as its DNA barcoding, providing new information on the Aloninae taxonomy. The specimens were collected in the dammed portion of the Cabo Verde River (21°26'05″ S and 46°10'57″ W, in the Furnas Reservoir, Minas Gerais State, Brazil. Forty neonates were observed individually two or three times a day under controlled temperature (25±1°C, photoperiod (12 h light/12 h dark and feeding (Pseudokirchneriella subcapitata at a concentration of 105 cells.mL-1 and a mixed suspension of yeast and fish feed in equal proportion. Individual body growth was measured daily under optical microscope using a micrometric grid and 40× magnification. The species had a mean size of 413(±29 µm, a maximum size of 510 µm and reached maturity at 3.24(±0.69 days of age. Mean fecundity was 2 eggs per female per brood and the mean number of eggs produced per female during the entire life cycle was 47.6(±6.3 eggs per female. The embryonic development time was 1.79(±0.23 days and the maximum longevity was 54 days. The species had eight instars throughout its life cycle and four instars between neonate and primipara stage. The present study using molecular data (a 461 bp smaller COI fragment demonstrated a deep divergence in the Aloninae subfamily.

  15. Inland swamps in South East Asia harbour hidden cladoceran diversities: species richness and the description of new paludal Chydoridae (Crustacea: Branchiopoda: Cladocera from Southern Thailand

    Directory of Open Access Journals (Sweden)

    Kay Van Damme

    2013-08-01

    Full Text Available Freshwater surveys in the tropics have high potential for revealing new taxa if a wide range of habitats is included. Tropical inland swamps are ignored during most zooplankton sampling campaigns. We show that swamps harbour underestimated Cladocera diversities in South East (SE Asia, illustrated here for Southern (S Thailand. According to our preliminary data, based on 22 swamp sites in ten provinces, the cladoceran diversity of swamp habitats is high (about 73 taxa, i.e. a species richness of about 85% of the cladoceran taxa recorded in S Thailand. The Chydoridae are the most diverse group, about 66% of the total (48 out of 73 species, followed by the Macrothricidae (12%; 9 species and the Sididae (11%; 8 species. Daphniidae only occupy a small proportion of the total species in these sites (5%; 4 species. Besides rare taxa, the SE Asian tropical swamps contain new records, even new species. We discuss the importance of tropical swamp habitats as hotspots of cladoceran diversity, which are being destroyed through agricultural and urban development in SE Asia. As an example, we describe two new paludal species of the Chydoridae (Crustacea: Branchiopoda: Cladocera, restricted to inland swamps in S Thailand. The new taxa have conspicuous morphologies within their respective genera (Karualona Dumont and Silva-Briano, 2000 and Notoalona Rajapaksa and Fernando, 1987, compared to their common sister species in the region. Karualona serrulata n.sp. is separated from congeners by i divided denticles on the posteroventral corner of the valves and ii single setules on the anterior face of the first limb (instead of groups of setules, as in the majority of the Aloninae. We include notes on the other, common Karualona sp. populations from S Thailand. These animals show similarities with K. iberica and K. karua, yet belong to neither; we discuss the variability of characters in these populations and in the genus. The second new taxon, Notoalona

  16. Alternativas tecnológicas para el procesamiento del camarón blanco (Litopenaeus schmitti) cultivado en Cuba.

    OpenAIRE

    Flores Gutiérrez, E.R.

    2001-01-01

    El cultivo del camarón se ha presentado como una alternativa de producción de este crustáceo ante los altos costos de las faenas de pesca provocados por los altos precios del combustible y los bajos rendimientos de las capturas ante el agotamiento del recurso. En el presente trabajo se presentan varias tecnologías de procesamiento del camarón susceptibles de ser aplicadas para su comercialización, así como una alternativa de organización del proceso de manipulació...

  17. Hyperglycemic stress response in Crustacea

    Directory of Open Access Journals (Sweden)

    S Lorenzon

    2005-09-01

    Full Text Available Blood glucose level in crustaceans is controlled by the crustacean Hyperglycemic Hormone (cHH,released from the eyestalk neuroendocrine centres both under physiological and environmental stressconditions. Hyperglycemia is a typical response of many aquatic animals to pollutants and stress and,in crustaceans, increased circulating cHH and hyperglycemia are reported to result from exposure toseveral environmental stressors. Biogenic amines and enkephalin have been found to mediate therelease of several neurohormones from crustacean neuroendocrine tissue and a model of thecontrolling network is proposed.

  18. Macrozooplâncton da Zona Econômica Exclusiva do Nordeste do Brasil (segunda expedição oceanográfica - REVIZEE/NE II com ênfase em Copepoda (Crustacea

    Directory of Open Access Journals (Sweden)

    Eliane Aparecida Holanda Cavalcanti

    2004-09-01

    Full Text Available Objetivando-se caracterizar a densidade, abundância relativa, freqüência de ocorrência, diversidade específica e associação de espécies do macrozooplâncton oceânico da "Zona Econômica Exclusiva" foi realizado o presente estudo. A região prospectada encontra-se localizada entre os paralelos 7º28'56"S - 34º32'45"W, referente a segunda expedição oceanográfica do Programa REVIZEE/NE, realizada pelo Noc. Antares da DHN/Marinha do Brasil. As amostras foram coletadas com rede de plâncton tipo bongo com malha de 300 e 500µm, no período de 31/01 a 07/02/97 em 21 estações, totalizando 42 amostras. Foram identificados 78 taxa. A densidade total dos organismos (exceto Copepoda variou de 2,31 a 6,06 org.m-3 (estações 55 e 56 e, para os Copepoda de 0,99 a 4,75 org.m-3 (estações 48 e 57. Em termos de freqüência de ocorrência Crustacea e Chaetognatha foram muito freqüentes; Cnidaria e Teleostei (ovos e larvas freqüentes; Mollusca, Annelida e Chordata pouco freqüentes e Protozoa raros. A diversidade específica variou de 0,648 a 4,037 ind.bits-1. A equitabilidade variou de 0,279 a 1,0. Os baixos valores de diversidade e equitabilidade ocorreram devido à dominância de Undinula vulgaris (Dana, 1849 e Calanopia americana F. Dahl, 1894. A análise cofenética revelou um r The present study was performed with the objective to characterise the density, relative abundance, frequency of occurrence, specific diversity and species associations of the oceanic macrozooplankton of the "Exclusive Economic Zone". The area under investigation is located between 7º28'56"S - 34º32'45"W and 3º21'08"S - 38º40'29"W, sampled during the second oceanographic expedition REVIZEE/NE on board OV Antares of the Brazilian Navy. Twenty-one samples were taken with bongo type plankton net with 300µm mesh size between 0 and 200 m depth. 63 (sixty and three taxa were identified. Total density varied from 2,31 to 6,06 ind.m-3 (station 55 and 56 for the whole

  19. Phylomitogenomics of Malacostraca (Arthropoda:Crustacea)

    Institute of Scientific and Technical Information of China (English)

    SHEN Xin; TIAN Mei; YAN Binlun; CHU Kahou

    2015-01-01

    Along with the sequencing technology development and continual enthusiasm of researchers on the mitochondrial genomes, the number of metazoan mitochondrial genomes reported has a tremendous growth in the past decades. Phylomitogenomics—reconstruction of phylogenetic relationships based on mitochondrial genomic data—is now possible across large animal groups. Crustaceans in the class Malacostraca display a high diversity of body forms and include large number of ecologically and commercially important species. In this study, comprehensive and systematic analyses of the phylogenetic relationships within Malacostraca were conducted based on 86 mitochondrial genomes available from GenBank. Among 86 malacostracan mitochondrial genomes, 54 species have identical major gene arrangement (excluding tRNAs) to pancrustacean ground pattern, including six species from Stomatopoda, three species from Amphipoda, two krill, seven species from Dendrobranchiata (Decapoda), and 36 species from Pleocyemata (Decapoda). However, the other 32 mitochondrial genomes reported exhibit major gene rearrangements. Phylogenies based on Bayesian analyses of nucleotide sequences of the protein-coding genes produced a robust tree with 100%posterior probability at almost all nodes. The results indicate that Amphipoda and Isopoda cluster together (Edriophthalma) (BPP=100). Phylomitogenomic analyses strong support that Euphausiacea is nested within Decapoda, and closely related to Dendrobranchiata, which is also consistent with the evidence from developmental biology. Yet the taxonomic sampling of mitochondrial genome from Malacostraca is very biased to the order Decapoda, with no complete mitochondrial genomes reported from 11 of the 16 orders. Future researches on sequencing the mitochondrial genomes from a wide variety of malacostracans are necessary to further elucidate the phylogeny of this important group of animals. With the increase in mitochondrial genomes available, phylomitogenomics will emerge as an important component in the Tree of Life researches.

  20. Iphimediidae of New Zealand (Crustacea, Amphipoda

    Directory of Open Access Journals (Sweden)

    Charles Oliver Coleman

    2013-11-01

    Full Text Available New Zealand species of Iphimediidae, Amphipoda, are revised. Based on new material from the Chatham Rise, east of New Zealand, two new species are described in detail: Labriphimedia meikae sp. nov. and Labriphimedia martinae sp. nov. A key to the six species belonging to three genera of New Zealand Iphimediidae is provided.

  1. On Parartemia zietziana Sayce (Crustacea Phyllopoda)

    NARCIS (Netherlands)

    Kuenen, D.J.

    1937-01-01

    On his journey to Australia, Prof. Dr. L. G. M. Baas Becking collected several specimens of Parartemia zietziana, which he kindly handed over to me for further examination. As it is a very little known species, the few details given below may add to our somewhat scanty knowledge. Sayce described thi

  2. The cavernicolous Oniscidea (Crustacea: Isopoda) of Portugal

    DEFF Research Database (Denmark)

    P. S. Reboleira, Ana Sofia; Gonçalves, Fernando J.; Oromí, Pedro;

    2015-01-01

    The study of subterranean Oniscidea in Portugal has been neglected for nearly 70 years, but recent investigations have revealed high diversity. All the terrestrial isopods known from caves of mainland Portugal, including data from the literature and new material, are listed, revealing new biodive...

  3. Scale-dependent analysis of an otter-crustacean system in Argentinean Patagonia

    Science.gov (United States)

    Cassini, Marcelo H.; Fasola, Laura; Chehébar, Claudio; MacDonald, David W.

    2009-05-01

    The Southern river otter or ‘huillin’, Lontra provocax, is an endangered species endemic of the Andean Patagonian region of Argentina and Chile. It feeds almost exclusively on the genera of macro-crustacea: Aegla and Sammastacus. The aim of this study was to analyse the role of food availability on the huillin’s distribution using a scale-dependent analysis of crustacean and otter distributions. We compared the distributions of otters and macro-crustaceans along a north-south regional gradient, between river basins of northern Patagonia, in an altitudinal gradient within a river basin, and between habitat types within a lake. We investigated the distribution of otters by sign surveys along lake shores, river banks and marine coasts, and of crustaceans using surveys in the water, undigested remains in mink ( Mustela vison) scats, presence of external skeletons at the waterside and through interviews with local people. Our results show that there were heterogeneities in the distributions of macro-crustaceans at four scales and these were generally reflected in the distributions of freshwater otters. We conclude that the main factor limiting the distributions of L. provocax in freshwater environments is the availability of macro-crustaceans. This paper shows how scale-dependent type analyses of population distribution serves as a method for identifying key environmental factors for species for which the use of long-term demographies is unfeasible.

  4. Corophiidae (Crustacea, Amphipoda da costa brasileira Corophiidae (Crustacea, Amphipoda from Brazilian coast

    Directory of Open Access Journals (Sweden)

    Maria Teresa Valério-Berardo

    2000-06-01

    Full Text Available Twelve genera and seventeen species of corophiid amphipods are reported from Brazilian coastal waters: Ampelisciphotis podophthalma J.L. Barnard, 1958, Aora spinicornis Afonso, 1976, Audulla chelifera Chevreux, 1901, Bemlos foresti (Mateus & Mateus, 1966, B. unicornis (Bynum & Fox, 1977, Cheiriphotis megacheles (Giles, 1885, Chevalia mexicana Pearse, 1913, Corophium acherusicum Costa, 1851, Gammaropsis (Gammaropsis atlantica Stebbing, 1888, G. (G.. thompsoni (Walker, 1898, G. (G. togoensis (Schellenberg, 1925, G. (Podoceropsis sophiae (Boeck, 1861, Globoso-lembos smithi (Holmes, 1905, Lembos hypacanthus (K.H. Barnard, 1916, Photis brevipes Shoemaker, 1942, P. longicaudata Bate & Westwood, 1862 e Pseudomegamphopus barnardi Myers, 1968. An identification key, diagnosis and latitutinal distribution of each species are provided.

  5. Aproximación a los requerimientos nutricionales de juveniles de camarón blanco Penaeus schmitti: evaluación de niveles y fuentes de proteína en la dieta.

    OpenAIRE

    Galindo López, J.

    1999-01-01

    La tendencia a asumir que los resultados obtenidos para las diferentes especies de peneidos más estudiadas pueden ser extrapolados directamente a las otras, constituye una práctica usual por muchos cultivadores de camarón, sin embargo, desde el punto de vista cuantitativo existen diferencias marcadas, lo que hace recomendable elaborar los alimentos teniendo en consideración los requerimientos específicos de la especie a la cual se le suministrará. Con el objetivo de determinar las necesidades...

  6. Inclusión de ensilado de pescado como alternativa en la elaboración de alimento extruido para el camarón de cultivo (Litopenaeus schmitti)

    OpenAIRE

    Balsinde, M.; Fraga, I.; J. Galindo

    2003-01-01

    The artificial feeds elaboration for aquatic species, it has always used as conventional technology of pelletized prosecution. The artificial balanced feeds production for the commercial breeding of the shrimp constitutes the base of the feeding of most of the cultures of aquatic species in Cuba. In this work three diets were elaborated by the extrusion technology substituting flour of having fished by silage, according to the nutritional requirements recommended for the white shrimp (L...

  7. Monstrilloida (Crustacea: Copepoda) from the Beagle Channel, South America

    NARCIS (Netherlands)

    Suárez-Morales, E.; Ramírez, F.C.; Derisio, C.

    2008-01-01

    Monstrilloid copepods were collected during zooplankton surveys in the Beagle Channel at the southernmost end of South America. These specimens represent two species of Monstrillopsis, one of them undescribed, and one new species of Monstrilla. Monstrillopsis igniterra n. sp. is related to forms of

  8. The Australian Monstrilloida (Crustacea: Copepoda) II. Cymbasoma Thompson, 1888.

    Science.gov (United States)

    Suárez-Morales, Eduardo; Mckinnon, A David

    2016-01-01

    Monstrilloid copepods collected during the past two decades from zooplankton surveys in reef and coastal areas of Australia were analyzed. A first contribution included the taxonomic analysis of three genera of the Monstrilloida, Monstrillopsis Sars, 1921, Maemonstrilla Grygier & Ohtsuka, 2008, and the newly described Australomonstrillopsis Suárez-Morales & McKinnon, 2014. In this document a taxonomic analysis of the species belonging to the genus Cymbasoma Thompson, 1888 is provided. A total of 28 species were found, most of them being undescribed. Seventeen species were described based on females only and eight on male specimens while three species were described from both sexes. Males of Australian species of Cymbasoma are distinguished by details of the genital complex, body size and proportions, ornamentation and processes of the cephalic region, number of caudal setae, and the characteristic structure or ornamentation of the genital lappets. Two main groups of males were distinguished on the basis of the number of caudal setae (3 or 4). As for the females, 20 of the 25 new species of Cymbasoma have fifth legs with an unarmed inner lobe and three setae on the outer lobe; one of these species (C. jinigudira sp. nov.) belongs to the C. longispinosum species-group (sensu Üstün et al. 2014). Another group, consisting of five species, has only two setae on the outer (exopodal) lobe. There were no Australian species of Cymbasoma with a single lobe. A species group, named after C. agoense, is proposed to include species sharing a globose body and a female fifth leg with a large endopodal lobe and an outer (exopodal) lobe with two setae. The females of the new species of Cymbasoma from Australia can be distinguished from their known congeners by unique combinations of characters including the type of body ornamentation, body size and shape, antennule armature and proportions, the presence of distinctive features of the legs 1-4, the presence/absence of processes on the genital compound somite, and the presence/absence of a constriction of the anal somite. We report the occurrence of two previously described species, C. agoense Sekiguchi, 1982 from Japan and C. bali Desai & Krishnaswamy, 1962 from India in Australian waters. Considering the addition of the 25 new species here described, the number of nominal species of the genus is now 66. A key to the Australian species of Cymbasoma (males and females) and a map showing their occurrence in Australia are also provided. PMID:27394608

  9. Deep sea Caridea (Crustacea, Decapoda from Campos Basin, RJ, Brazil

    Directory of Open Access Journals (Sweden)

    Irene A. Cardoso

    2007-03-01

    Full Text Available During the Campos Basin Deep Sea Environmental Project coordinated by CENPES/PETROBRAS two collecting campaigns were performed. Both used the N/RB Astrogaroupa and fishery nets to collect samples from the continental slope in Campos Basin, RJ (21º48'S to 22º48'S. Campaign Oceanprof I occurred in February, 2003 and collected 18 samples at depths between 1074 and 1649 m. Oceanprof II occurred in August, 2003 and collected 22 samples at depths between 1059 and 1640 m. A total of 14 caridean species were collected: Parapontophilus sp. (Crangonidae; Glyphocrangon longirostris (Smith, 1882 (Glyphocrangonidae; Lebbeus sp. (Hippolytidae; Nematocarcinus ensifer (Smith, 1882 (Nematocarcinidae; Acanthephyra eximia Smith, 1884; A. quadrispinosa Kemp, 1939; A. stylorostratis (Bate, 1888; Janicella spinicauda (A. Milne Edwards, 1883; Meningodora vesca (Smith, 1887; Notostomus elegans A. Milne Edwards, 1881; Oplophorus spinosus (Brullé, 1839; and Systellaspis debilis (A. Milne Edwards, 1881 (Oplophoridae; Heterocarpus inopinatus Tavares, 1999 and Plesionika sp. (Pandalidae. Three out of these 14 species, Parapontophilus sp., Lebbeus sp. and Plesionika sp. are still under investigation and were not included in the present study. From the 11 species identified Nematocarcinus ensifer is a new record for the Brazilian continental slope.Durante o Projeto de Caracterização Ambiental de Águas Profundas da Bacia de Campos coordenado pelo CENPES/PETROBRAS duas campanhas de coleta foram realizadas. Ambas utilizaram o N/RB Astrogaroupa e redes de pesca de arrasto com porta para coletar amostras do talude continental da Bacia de Campos, RJ (21º48' S a 22º48'S. A campanha Oceanprof I ocorreu em fevereiro de 2003, coletou 18 amostras em profundidades que variaram entre 1074 e 1649 m e a Oceanprof II em agosto de 2003 coletou 22 amostras em profundidades variando entre 1059 e 1640 m. No total, 14 espécies de Caridea foram coletadas: Parapontophilus sp. (Crangonidae; Glyphocrangon longirostris (Smith, 1882 (Glyphocrangonidae; Lebbeus sp. (Hippolytidae; Nematocarcinus ensifer (Smith, 1882 (Nematocarcinidae; Acanthephyra eximia Smith, 1884; A. quadrispinosa Kemp, 1939; A. stylorostratis (Bate, 1888; Janicella spinicauda (A. Milne Edwards, 1883; Meningodora vesca (Smith, 1887; Notostomus elegans A. Milne Edwards, 1881; Oplophorus spinosus (Brullé, 1839; e Systellaspis debilis (A. Milne Edwards, 1881 (Oplophoridae; Heterocarpus inopinatus Tavares, 1999 e Plesionika sp. (Pandalidae. Dentre estas 14 espécies, Parapontophilus sp., Lebbeus sp. e Plesionika sp. estão sendo trabalhadas e não foram incluídas no presente trabalho. Das 11 espécies identificadas, Nematocarcinus ensifer representa uma nova ocorrência para o talude continental brasileiro.

  10. Age and origin of Australian Bennelongia (Crustacea, Ostracoda)

    OpenAIRE

    SCHON, Isa; Shearn, Rylan; Martens, Koen; Koenders, Annette; Halse, Stuart

    2015-01-01

    South-western Australia holds an exceptional number of endemic taxa and has been recognized as a biodiversity hotspot at a global scale. We report a much higher diversity in the genus Bennelongia (Ostracoda) in Western than in eastern Australia. Using mitochondrial COI sequence data for phylogenies, relative age estimates, lineage-through-time plots, and reconstructions of ancestral distributions, we test four hypotheses that might explain the higher diversity and endemicity in Western Austra...

  11. COMPORTAMENTO REPRODUTIVO DE Dendrocephalus brasiliensis, Pesta 1921 (CRUSTACEA: ANOSTRACA

    Directory of Open Access Journals (Sweden)

    José Patrocínio Lopes

    2011-12-01

    Full Text Available The reproductive behavior of fresh water Anostracan has not been massively studied by the carcinology specialized literature, regarding especially the Dendrocephalus brasiliensis Pesta, 1921, about which there are abundant studies only on the geographical distribution of that Anostracan. The objective of this research was to investigate the reproductive behavior of this Anostracan in different periods (dry and rainy. For this, mature individuals of both sexes were used. They were collected in four ponds of the Fish Farming Station of Paulo Afonso (FFSPA, by monthly capture in each pond, within the period from December 2004 to November 2005. The reproduction type was observed by placing some females in aquariums with males and placing the other ones individually, starting from the nauplii phase, where they stayed for 15 days (reproductive age. The individuals' sexual proportion was calculated by the relative frequencies of males and of females, every month, for the whole collection period. At 10 days cysts production is possible and the number of produced cysts is related to the size of the female. The ratio male:female in the studied period was of 1 male to 1.07 female. The proportion male:female was 51.75% female to 48.25% male along the year. The observation of the reproductive behavior showed the reproduction is sexed.

  12. Phylogeny of the Paracalanidae Giesbrecht, 1888 (Crustacea: Copepoda: Calanoida).

    Science.gov (United States)

    Cornils, Astrid; Blanco-Bercial, Leocadio

    2013-12-01

    The Paracalanidae are ecologically-important marine planktonic copepods that occur in the epipelagic zone in temperate and tropical waters. They are often the dominant taxon - in terms of biomass and abundance - in continental shelf regions. As primary consumers, they form a vital link in the pelagic food web between primary producers and higher trophic levels. Despite the ecological importance of the taxon, evolutionary and systematic relationships within the family remain largely unknown. A multigene phylogeny including 24 species, including representatives for all seven genera, was determined based on two nuclear genes, small-subunit (18S) ribosomal RNA and Histone 3 (H3) and one mitochondrial gene, cytochrome c oxidase subunit I (COI). The molecular phylogeny was well supported by Maximum likelihood and Bayesian inference analysis; all genera were found to be monophyletic, except for Paracalanus, which was separated into two distinct clades: the Paracalanus aculeatus group and Paracalanus parvus group. The molecular phylogeny also confirmed previous findings that Mecynocera and Calocalanus are genera of the family Paracalanidae. For comparison, a morphological phylogeny was created for 35 paracalanid species based on 54 morphological characters derived from published descriptions. The morphological phylogeny did not resolve all genera as monophyletic and bootstrap support was not strong. Molecular and morphological phylogenies were not congruent in the positioning of Bestiolina and the Paracalanus species groups, possibly due to the lack of sufficient phylogenetically-informative morphological characters. PMID:23831457

  13. Nerocila species (Crustacea, Isopoda, Cymothoidae) from Indian marine fishes

    OpenAIRE

    Trilles, Jean-Paul; Rameshkumar, Ganapathy; Ravichandran, Samuthirapandian

    2013-01-01

    Eleven Nerocila species are recorded from 22 marine fishes belonging to 15 families. Three, Nerocila arres, Nerocila depressa, and Nerocila loveni, are new for the Indian fauna. N. arres and Nerocila sigani, previously synonymized, are redescribed and their individuality is restored. Nerocila exocoeti, until now inadequately identified, is described and distinctly characterized. A neotype is designated. New hosts were identified for N. depressa, N. loveni, Nerocila phaiopleura, Nerocila serra...

  14. Cladocera (Crustacea: Branchiopoda of Cat Tien National Park, South Vietnam

    Directory of Open Access Journals (Sweden)

    Artem Y. Sinev

    2013-08-01

    Full Text Available Cladocera of Cat Tien National Park, South Vietnam, and the surrounding agricultural area, were surveyed during the spring of 2009 (onset of the wet season and autumn 2010 (end of the wet season. The studied water bodies included two large lakes (Bau Sau and Bau Chim, small lakes and ponds, temporary pools, rivers and streams, as well as rice fields and ponds in an agricultural area beyond the boundaries of the National Park. Fifty three species of Cladocera were found, 18 of them new for Vietnam. Distribution and taxonomical status of the species are discussed. Of the recorded species, 58.5% (31 were found only in the National Park, 34% (18 both in the National Park and the agricultural area, and only 7.5% (4 exclusively in the agricultural area. Of the 20 species new for Vietnam, only one was found both in the National Park and the agricultural area, all others were found in the National Park only. Such a difference can be directly attributed to the loss of natural habitats (forest ponds and streams in agricultural areas and to the pollution by pesticides. Our study shows the importance of surveys in pristine and protected areas, for the full evaluation of regional microcrustacean richness.

  15. COMPORTAMENTO REPRODUTIVO DE Dendrocephalus brasiliensis, Pesta 1921 (CRUSTACEA: ANOSTRACA)

    OpenAIRE

    José Patrocínio Lopes; Hélio de Castro Bezerra Gurgel; Cibele Soares Pontes

    2011-01-01

    The reproductive behavior of fresh water Anostracan has not been massively studied by the carcinology specialized literature, regarding especially the Dendrocephalus brasiliensis Pesta, 1921, about which there are abundant studies only on the geographical distribution of that Anostracan. The objective of this research was to investigate the reproductive behavior of this Anostracan in different periods (dry and rainy). For this, mature individuals of both sexes were used. They were collected i...

  16. Deep phylogeny and character evolution in thecostraca (Crustacea: Maxillopoda)

    DEFF Research Database (Denmark)

    Pérez-Losada, Marcos; Høeg, Jens Thorvald; Crandall, Keith A.

    2012-01-01

    The thecostracans include the Facetotecta, Ascothoracida, and Cirripedia and show great diversity in both morphology and biology. This makes them ideal models for studying evolutionary adaptations of the larval and adult body-plan, lifestyle, and reproduction. Surprisingly, despite all the work p...

  17. Phylogenetic position of Antarctic Scalpelliformes (Crustacea: Cirripedia: Thoracica)

    Science.gov (United States)

    Linse, Katrin; Jackson, Jennifer A.; Fitzcharles, Elaine; Sands, Chester J.; Buckeridge, John S.

    2013-03-01

    The phylogenetic relationships of seven Antarctic barnacle species, one verrucomorph and six scalpelliforms from the Scotia, Weddell and Ross seas were investigated using DNA sequences from two nuclear genes (18 S and 28 S) and one mitochondrial gene (COI), with a combined total length of 3,151 base pairs. Analyses of these new sequences, together with those of previously published ibliform, lepadiform, scalpelliform, balanomorph and verrucomorph species, confirm that the Scalpelliformes are not monophyletic. Bayesian and maximum likelihood analyses consistently recovered a monophyletic group which comprised Ornatoscalpellum stroemii (Sars) and the Southern Ocean scalpellomorphs; Arcoscalpellum sp. from the Weddell Sea, Arcoscalpellum africanum from Elephant Island, A. bouveti from Bouvet Island, the circum-Antarctic Litoscalpellum discoveryi, Litoscalpellum sp. from Shag Rocks and Scalpellum sp. from the Falkland Trough. We also used multiple fossil constraints in a relaxed clock Bayesian framework to estimate divergence times for the 18 S+28 S phylogeny. Our results indicate a mid Cretaceous divergence for the Weddell Sea Arcoscalpellum sp, followed by a late Cretaceous divergence from the North Atlantic O. stroemii. Subsequent to this, the Antarctic scalpellomorphs began to radiate at the Cretaceous-Tertiary boundary. Monophyly within the scalpellid genera Arcoscalpellum, Litoscalpellum and Scalpellum was strongly rejected by all loci. Our results show incongruence between taxonomy and molecular systematics and highlight the need for more species to be sequenced as well as taxonomic revisions to resolve uncertainties in the phylogenetic relationships of the stalked barnacles.

  18. Phylogeny, evolution and classification of the Branchiopoda (Crustacea)

    OpenAIRE

    Negrea, S.; Botnariuc, N.; Dumont, H.J.

    1999-01-01

    We present a cladistic analysis of all branchiopod groups, using a total of 42 morphological characters. The class Branchiopoda is composed of five superorders and 11 orders (nine recent, two fossil). The orders Ctenopoda, Anomopoda and Onychopoda form a monophyletic group, combined in the superorder Cladocera. The order Haplopoda, the fourth so-called cladoceran order (s. lat.), belongs to a new monotypic superorder, the Leptodorida. The circumtropical Cyclesteria hislopi is the sole represe...

  19. Remarkable convergent evolution in specialized parasitic Thecostraca (Crustacea)

    DEFF Research Database (Denmark)

    Pérez-Losada, Marcos; Høeg, Jens Thorvald; Crandall, Keith A

    2009-01-01

    metamorphosis found in the Facetotecta and Rhizocephala suggests a common evolutionary origin, but until now no comprehensive study has looked at the basic evolution of these thecostracan groups. Results To this end, we collected DNA sequences from three nuclear genes [18S rRNA (2,305), 28S rRNA (2......)))). Conclusion Our analyses indicate a convergent evolution of the very similar and highly reduced slug-shaped stages found during metamorphosis of both the Rhizocephala and the Facetotecta. This provides a remarkable case of convergent evolution and implies that the advanced endoparasitic mode of life known...

  20. Comparative ultrastructure of the root system in rhizocephalan barnacles (Crustacea

    DEFF Research Database (Denmark)

    Bresciani, J; Høeg, Jens Thorvald

    2001-01-01

    slightly fibrous structure and an outer, less than 15-nm thick electron-dense layer, from which numerous microcuticular projections extend into the hemolymphatic space of the host. The microcuticular projections consist of the outer electron-dense layer and sometimes a core of the more translucent...

  1. The first hypothelminorheic Crustacea (Amphipoda, Dogielinotidae, Hyalella from South America

    Directory of Open Access Journals (Sweden)

    Stella Rodrigues

    2012-11-01

    Full Text Available Most of known troglobiotic species occur in caves and subterranean environments from great depths. However, recently more attention has been given to other subterranean environments, such as the hypothelminorheic habitats. It comprises the most superficial among all subterranean habitats. This kind of environment is characterized by the constant presence of wet spots, absence of light and very particular abiotic characteristics, comprising unique species. The first hypothelminorheic Amphipoda from South America is here described, a new species of the genus Hyalella which occurs in a wetland on Southern Brazil. The new species differs from other troglobiotics of the genus by the presence of a curved seta on the inner ramus of uropod 1 and elongation of appendices, as the first pair of antennae and peraeopods 6 and 7. However, human impacts in the area where the new species occurs have changed heavily their habitat, which may have led the species to a critical level of threat or even extinction, demonstrating the fragility of this environment.a

  2. Cryptic species in putative ancient asexual darwinulids (Crustacea, Ostracoda.

    Directory of Open Access Journals (Sweden)

    Isa Schön

    Full Text Available BACKGROUND: Fully asexually reproducing taxa lack outcrossing. Hence, the classic Biological Species Concept cannot be applied. METHODOLOGY/PRINCIPAL FINDINGS: We used DNA sequences from the mitochondrial COI gene and the nuclear ITS2 region to check species boundaries according to the evolutionary genetic (EG species concept in five morphospecies in the putative ancient asexual ostracod genera, Penthesilenula and Darwinula, from different continents. We applied two methods for detecting cryptic species, namely the K/θ method and the General Mixed Yule Coalescent model (GMYC. We could confirm the existence of species in all five darwinulid morphospecies and additional cryptic diversity in three morphospecies, namely in Penthesilenula brasiliensis, Darwinula stevensoni and in P. aotearoa. The number of cryptic species within one morphospecies varied between seven (P. brasiliensis, five to six (D. stevensoni and two (P. aotearoa, respectively, depending on the method used. Cryptic species mainly followed continental distributions. We also found evidence for coexistence at the local scale for Brazilian cryptic species of P. brasiliensis and P. aotearoa. Our ITS2 data confirmed that species exist in darwinulids but detected far less EG species, namely two to three cryptic species in P. brasiliensis and no cryptic species at all in the other darwinulid morphospecies. CONCLUSIONS/SIGNIFICANCE: Our results clearly demonstrate that both species and cryptic diversity can be recognized in putative ancient asexual ostracods using the EG species concept, and that COI data are more suitable than ITS2 for this purpose. The discovery of up to eight cryptic species within a single morphospecies will significantly increase estimates of biodiversity in this asexual ostracod group. Which factors, other than long-term geographic isolation, are important for speciation processes in these ancient asexuals remains to be investigated.

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

    Directory of Open Access Journals (Sweden)

    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.

  4. Cladocera (Crustacea: Branchiopoda of Vientiane province and municipality, Laos

    Directory of Open Access Journals (Sweden)

    Alexey A. Kotov

    2013-12-01

    Full Text Available We present the first faunistic report on the Laotian Cladocera from diverse habitats in Vientiane province, Central Laos. We counted a total of 70 species, belonging to 37 genera, which is realistically close to an estimated 77 species. The five most common species were Diaphanosoma excisum, Ephemeroporus cf. barroisi, Anthalona harti, Macrothrix spinosa and Chydorus cf. eurynotus. The fauna is typically Oriental/Southeast (SE Asian, showing a strong similarity with neighbouring countries and especially Thailand. We discussed the current taxonomical status of the species and provided illustrations of the main taxa for future comparison. There are no surprising faunistic elements, except for a few new records for SE Asia (Matralona freyi, Ilyocryptus thailandensis. Our data is preliminary, as the fauna of Laos remains insufficiently studied. As for SE Asia as a whole, a significant number of taxa is in need of taxonomical revision.

  5. Identifying Chinese species of Gammarus (Crustacea: Amphipoda) using DNA barcoding

    Institute of Scientific and Technical Information of China (English)

    Zhong-e HOU; Zhu LI; Shu-qiang LI

    2009-01-01

    Using a standard cytochrome c oxidase I sequence, DNA barcoding has been shown to be effective to distinguish known species and to discover cryptic species. Here we assessed the efficiency of DNA barcoding for the amphipod genus Gammarus from China. The maximum intraspecific divergence for widespread species, Gammarus lacustris, was 3.5%, and mean interspecific divergence reached 21.9%. We presented a conservative benchmark for determining provisional species using maximum intraspecific divergence of Gammarus lacustris. Thirty-one species possessed distinct barcode clusters. Two species were comprised of highly divergent clades with strong neighbor-joining bootstrap values, and likely indicated the presence of cryptic species. Although DNA barcoding is effective, future identification of species of Gammarus should incorporate DNA barcoding and morphological detection[Current Zoology 55(2):158-164,2009].

  6. A Review and Catalogue of the Amphipoda (Crustacea) in Ireland

    OpenAIRE

    Costello, M. J.; Holmes, J. M. C.; McGrath, D.; Myers, A. A.

    1989-01-01

    The distribution and source of published and unpublished records of 307 marine, freshwater, terrestrial and subterranean amphipod species in Ireland are documented. A historical account of studies on amphipods in Ireland, including the researchers, frequency of publications, localities and habitats surveyed, and sampling methods, is presented. The occurrence of introduced species, commensalism, and parasitism is noted. The amphipod fauna recorded from Galway Bay, Kilkieran Bay, the Clar...

  7. Effects of predation by Hydra (Cnidaria on cladocerans (Crustacea: Cladocera

    Directory of Open Access Journals (Sweden)

    Ligia Rivera-De la Parra

    2016-03-01

    Full Text Available Planktonic cladocerans have evolved different strategies to avoid predation from vertebrates; these include changes in morphology, behavior, physiology, and/or life-history traits. However, littoral cladocerans are better adapted to avoid invertebrate predation particularly from insect larvae by evolving morphological and physiological adaptations. Nevertheless, this has not been proven for some littoral predators such as Hydra. In this study, we provide quantitative data on how Hydra affects its zooplankton prey. We studied the predation behavior on Alona glabra, Ceridodaphnia dubia, Daphnia pulex, Daphnia cf. mendotae, Diaphanosoma birgei, Macrothrix triserialis, Moina macrocopa, Pleuroxus aduncus, Scapholeberis kingi, Simocephalus vetulus, Elaphoidella grandidieri, Brachionus rubens and Euchlanis dilatata. We also tested the indirect effect of allelochemicals from Hydra on the demography of Daphnia cf. mendotae. Littoral cladocerans are specially adapted to resist nematocyst injection and discharge of toxic substances from Hydra. A significant decrease in the population growth rate from 0.21 to 0.125 d-1 was observed at densities of 2 ind. ml-1. The role of carapace thickness as an adaptive strategy of littoral cladocerans against Hydra predation is discussed.

  8. Redescription of Coralliocaris brevirostris Borradaile, 1898 (Crustacea, Decapoda, Pontoniinae)

    NARCIS (Netherlands)

    Holthuis, L.B.

    1965-01-01

    In 1898 Borradaile described a new species of Coralliocaris from Funafuti, Ellice Islands. The original diagnosis was very short, but one year later Borradaile (1899: 1006, pl. 64 fig. 7) gave a slightly longer description and illustrations. No new finds of the species have been reported upon since

  9. Redescription of three cirolanid isopods (Crustacea: Peracarida) from Indonesia.

    Science.gov (United States)

    Sidabalok, Conni M; Bruce, Niel L

    2016-01-01

    Three species of Cirolanidae described by Nierstrasz in 1931 are redescribed from the type material: Cirolana indica Nierstrasz, 1931, with new material from Singapore and Lombok Island, Indonesia; C. vanhoeffeni Nierstrasz, 1931; and C. stebbingi Nierstrasz, 1931, which is here transferred to the genus Politolana Bruce, 1981 based on the elongate body, long peduncle of pleopod 1, narrow and slender frontal lamina, flat and robust carpus of pereopod 7, long and acute robust setae on merus-propodus pereopod 1, secondary unguis on dactylus, and antenna peduncle articles 1-2 shorter than the subequal articles 3-5. PMID:27395130

  10. The tropical talitrid genus Floresorchestia (Crustacea, Amphipoda, Talitridae).

    Science.gov (United States)

    Lowry, J K; Springthorpe, R T

    2015-01-01

    Floresorchestia floresiana (Weber, 1892) from Flores, F. anomala (Chevreux, 1901) from the Seychelles, F. malayensis (Tattersall, 1922) from Singapore and F. thienemanni (Schellenberg, 1931) from Java are redescribed based on original type material or newly collected material from near the type locality. Nine new species are described, in the widespread Indo-West Pacific and Caribbean talitrid genus Floresorchestia: F. andrevo sp. nov. and F. itampolo sp. nov. from Madagascar; F. kalili sp. nov. from the Bismarck Archipelago, Papua New Guinea; F. laurenae sp. nov. from Timor-Leste; F. oluanpi sp. nov. from southern Taiwan; F. papeari sp. nov. from Tahiti; F. serejoae sp. nov. from far north Queensland, Australia; F. seringat sp. nov. from Singapore; and F. yap sp. nov. from Micronesia; plus Floresorchestia sp. 1 from Hainan Island, South China Sea, Floresorchestia sp. 2 from Kilakarai and other sites in south-eastern India and Floresorchestia sp. 3 from Phuket Island, Thailand. Floresorchestia contains 28 species. In this paper all are catalogued and diagnosed. PMID:25781854

  11. Species of marine Isopoda (Crustacea, Peracarida from southern Brazil

    Directory of Open Access Journals (Sweden)

    Plínio Soares Moreira

    1972-01-01

    Full Text Available Some species of marine Isopoda collected in southern Brazil mostly in shallow-water and amongst seaweeds are studied. Five species are discussed and illustrated. A diagnosis is given for each species. Idotea metallica and Synidotea marplatensis are new oc currences for the area, and both have had their geographical range extended to off Rio de Janeiro. The presence of Idotea balthica and Erichsonella filiformis in southern Brazil was definitely asserted. Illustrations of both sexes of Rocinela signata and details about its occurrence in the region surveyed were made.O presente trabalho relaciona algumas espécies de isopodes marinhos coletados na região centro-sul do Brasil, em águas razas, em algas, ou entre emaranhados de folhas e raizes. Cinco espécies são ilustradas e discutidas. Uma diagnose é dada para cada espécie. I. metallica e S. marplatensis, constituindo novas ocorrências para a região, tiveram sua distribuição geográfica consideravelmente ampliada ate o Rio de Janeiro. A presença de I. balthica e E. filiformes na região e seguramente confirmada. Finalmente, são figurados o macho e a fêmea da espécie R. signata, ao mesmo tempo em que são fornecidos detalhes sobre sua ocorrência.

  12. The tantulocarid genus Arcticotantalus removed from Basipodellidae into Deoterthridae (Crustacea

    DEFF Research Database (Denmark)

    Knudsen, Steen Wilhelm; Kirkegaard, Maja; Olesen, JØrgen

    2009-01-01

    is tentatively placed in Deoterthridae based on the mode of formation of the male trunk sac, the pattern of ornamentation on the tergites and cephalic shield, and the number of setae on the thoracopods and caudal rami. It is suggested that the genus Arcticotantulus Kornev, Tchesunov & Rybnikov, 2004 is removed...

  13. Embriologia do siri Arenaeus cribrarius (Lamarck (Crustacea, Brachyura, Portunidae Embryology of the swimming crab Arenaeus cribrarius (Lamarck (Crustacea, Brachyura, Portunidae

    Directory of Open Access Journals (Sweden)

    Marcelo A.A. Pinheiro

    2002-06-01

    Full Text Available Ovigerous females of Arenaeus cribrarius were collected at Ubatuba, São Paulo, and maintaining in aquaria under controlled temperature (25±1ºC, salinity (35±1‰ and photoperiod (12:12. A small sample of eggs was collected for each 24h, for morphological description, chromatic changes and biometric analysis throughout the embryonic development. Eight egg stages were photographed and had their small and large diameters measured under a microscope provided with camera lucida. The egg's shape was low elliptical during all the embryogenesis and showed size increase (24.4% and volume (91.1 %, when the last stage were compared with the first one. According to mean egg diameter and volume, the eggs should be pooled in three different groups (1-3; 4-6; 7-8 corresponding to initial, intermediate and final stages. The attained results were compared with the literature which emphasizing the species of Portunidae's family.

  14. Embriologia do siri Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae) Embryology of the swimming crab Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae)

    OpenAIRE

    Marcelo A. A. Pinheiro; Gustavo Yomar Hattori

    2002-01-01

    Ovigerous females of Arenaeus cribrarius were collected at Ubatuba, São Paulo, and maintaining in aquaria under controlled temperature (25±1ºC), salinity (35±1‰) and photoperiod (12:12). A small sample of eggs was collected for each 24h, for morphological description, chromatic changes and biometric analysis throughout the embryonic development. Eight egg stages were photographed and had their small and large diameters measured under a microscope provided with camera lucida. The egg's shape w...

  15. Exoskeletal proteins from the crab, Cancer pagurus

    DEFF Research Database (Denmark)

    Andersen, Svend Olav

    Crustacea; decapods; cuticle; exoskeleton; structural protein; amino acid sequence; mass spectrometry......Crustacea; decapods; cuticle; exoskeleton; structural protein; amino acid sequence; mass spectrometry...

  16. Vaikne Ö taaselustus

    Index Scriptorium Estoniae

    2008-01-01

    15. augustil sai Võsu rannaklubis muuhulgas vaadata filmi "Nukitsamees" ja kuulata Rakvere linnanoorte teatritrupi noori lugemas Eric-Emmanuel Schmitt'i raamatut "Härra Ibrahim ja Koraani õied". Ürituse eestvedaja on Kaire Leemet

  17. Posvjashenije Eve / Mark Levin

    Index Scriptorium Estoniae

    Levin, Mark

    2000-01-01

    Kahest lavastusest : Vene Draamateatri monoetendusest Dario Fo/F.Rame "Ootan sind, kallim" Ljubov Agapovaga, lavastaja Irina Tomingas ja Moskva Vahtangovi nim. Teatri etendusest E. Schmitti "Pühendus Eevale", lavastaja Sergei Jashin

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

    Directory of Open Access Journals (Sweden)

    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. Tanaidáceos (Crustacea: Peracarida de los litorales de Guerrero y Oaxaca, México Littoral tanaidaceans (Crustacea: Peracarida from Guerrero and Oaxaca, Mexico

    Directory of Open Access Journals (Sweden)

    Jani Jarquín-González

    2010-10-01

    Full Text Available Los tanaidáceos son componentes esenciales de las cadenas tróficas del bentos marino, son fuente de alimento para especies de relevancia comercial y para otros organismos marinos. A pesar de su importancia, el conocimiento del grupo se ha rezagado debido a los problemas relacionados con su biología y taxonomía, y por la carencia de muestreos exhaustivos y sistemáticos; así, en las costas de Guerrero y Oaxaca sólo se había registrado 1 género. Por lo anterior, el objetivo fue conocer la composición específica y los patrones de distribución de los tanaidáceos litorales de Guerrero y Oaxaca. De 4 275 ejemplares, se identificaron 6 familias y 9 morfotipos: Hexapleomera robusta, Sinelobus stanfordi, Leptochelia cf. dubia, Paratanais cf. denticulatus, Paradoxapseudes cf. garthi, Apseudormorpha sp., Cyclopoapseudes cf. indecorus, Synapseudes sp. y Parapseudes pedispinis. Todos son registros nuevos para el litoral de Guerrero y Oaxaca. Se amplía el intervalo de distribución hacia el norte, para H. robusta de islas Galápagos a Guerrero. Para S. stanfordi y P. pedispinis se proporcionan localidades intermedias que rompen con la distribución disyunta previa en el Pacífico oriental. Hay 6 especies, posiblemente nuevas, con distribución restringida; 2 son de amplia distribución y 1 restringida al Pacífico oriental tropical.The tanaidaceans are essential components in food chains of marine benthos, since they are the main food source for commercially important species and other marine organisms. Despite their importance, problems related to their biology and taxonomy have delayed the understanding of the group, as observed on the coasts of Guerrero and Oaxaca, where only 1 genus was previously known. The aim was to determine the species richness and distribution patterns of littoral tanaids from Guerrero and Oaxaca. A total of 4 275 specimens were collected and 6 families and 9 morphotypes have been identified: Hexapleomera robusta, Sinelobus stanfordi, Leptochelia cf. dubia, Paratanais cf. denticulatus, Paradoxapseudes cf. garthi, Apseudormorpha sp., Cyclopoapseudes cf. indecorus, Synapseudes sp. and Parapseudes pedispinis. All species are new records for the littorals of Guerrero and Oaxaca. Hexapleomera robusta increased the range distribution to the north, from the Galapagos to Guerrero; and S. stanfordi and P. pedispinis are the first intermediate records for a previously disjunct distribution in the East Pacific. With respect to the distribution patterns, 6 species have restricted distribution, represented by possible new species; 2 species have a wider distribution, and 1 species has restricted distribution to the tropical eastern Pacific.

  20. 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

    Directory of Open Access Journals (Sweden)

    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.

  1. Fertilizers for Daphnia sp. (Crustacea, Cladocera production in experimental tanks Fertilizantes para produção de Daphnia sp. (Crustacea, Cladocera em tanques experimentais

    Directory of Open Access Journals (Sweden)

    Patrícia de Souza Lima Cunha

    2010-05-01

    Full Text Available The current study was aimed at investigating the use of different fertilizers - dicalcium phosphate, biosolid and quail feces - as a strategy for water fertilization in Daphnia sp production. It was used twenty-four 100-L tanks of asbestos cement distributed in a completely randomized split-plot design with six replicates, with plots in the three kinds of fertilizers (biosolid, dicalcium phosphate, and quail feces and a control without fertilization (WF and subplots at the times of assessment (days 8 and 13. It was assessed the biomass production of Daphnia sp. and the following water quality parameters: chlorophyll a, electrical conductivity, pH, dissolved oxygen, temperature, ammonia and organic nitrogen, total phosphorus and total hardness. There was a significant correlation between the values of chlorophyll a and biomass weight of Daphnia sp, which indicates interactions between phytoplankton and zooplankton communities. The maximum weight of Daphnia sp. biomass is found in tanks fertilized with quail feces (35.98 g, followed by the biosolid (16.80 g, control without fertilization (6.75 g and dicalcium phosphate (5.24 g.Este trabalho foi conduzido com o objetivo de avaliar a utilização de fertilizantes - fosfato bicálcico, biossólido e fezes de codorna - na água de produção de Daphnia sp. Foram utilizados 24 tanques de cimento-amianto, cada um com volume útil de 100 L, em um delineamento inteiramente ao acaso em parcelas subdivididas com seis repetições, tendo nas parcelas os tipos de fertilizantes e um controle, sem adubação, e nas subparcelas as épocas de avaliação (dias 8 e 13. Foram avaliados a produção da biomassa de Daphnia sp. e os seguintes parâmetros de qualidade da água: clorofila a, condutividade elétrica, pH, oxigênio dissolvido, temperatura, nitrogênio amoniacal e orgânico, fósforo total e dureza total. Observou-se correlação significativa entre os valores de clorofila a e o peso da biomassa de Daphnia sp., o que indica interação entre as comunidades fito e zooplanctônicas. O peso máximo da biomassa de Daphnia sp. em tanques adubados com fezes de codorna é maior (35,98 g que em tanques adubados com biossólido (16,80 g, sem adubação (6,75 g ou adubados com fosfato bicálcico (5,24 g.

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

    Directory of Open Access Journals (Sweden)

    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.

  3. The manca stages of Porcellio dilatatus Brandt (Crustacea, Isopoda, Oniscidea Os estágios de manca de Porcellio dilatatus Brandt (Crustacea, Isopoda, Oniscidea

    Directory of Open Access Journals (Sweden)

    Pedro E. D. Brum

    2007-06-01

    Full Text Available This paper presents the description of the three manca stages of the terrestrial isopod Porcelliodilatatus Brandt, 1833 (Porcellionidae. Ovigerous females were collected and kept in the laboratory under controlled conditions (23°C ± 1°C and 14:10 h light:darkness. After birth, mancas (M were individually reared, and their development was observed. Stages M I, M II, and M III were described based on general characteristics, ommatidia, and appendages. The average development time of each stage was: M I = 18.7 ± 1.5 h (n = 52, M II = 12.7 ± 1.19 days (n = 101, and M III = 12.7 ± 0.45 days (n = 24. Growth was observed using measurements of cephalotorax width. The main characteristics of each stage are presented.Este trabalho apresenta a descrição dos três estágios de manca (M do isópodo terrestre Porcelliodilatatus Brandt,1833 (Porcellionidae. Fêmeas ovígeras foram coletadas e mantidas em laboratório sob condições controladas (23°C ± 1°C e 14:10 h luz:escuro. Ao saírem do marsúpio as mancas (M foram criadas individualmente e o seu desenvolvimento foi observado. Os estágios M I, M II, e M III foram descritos com base em caracteres gerais, ommatidia, e apêndices. O tempo médio de desenvolvimento para cada estágio foi: M I = 18,7 ± 1,5 h (n = 52, M II = 12,7 ± 1,19 dias (n = 101, e M III = 12,7 ± 0,45 dias (n = 24. O crescimento foi observado utilizando a medida da largura do cefalotórax. São apresentadas as características principais de cada estágio.

  4. A new species of Benthana (Crustacea: Isopoda: Philosciidae from southern Brazil Uma nova espécie de Benthana Budde-Lund (Crustacea: Isopoda: Philosciidae sul do Brasil

    Directory of Open Access Journals (Sweden)

    Carolina C. Sokolowicz

    2008-06-01

    Full Text Available A new species of Benthana Budde-Lund, 1908 is described from southern Brazil. Benthana cairensis sp. nov. is distinguished from the other species in the genus by having 17 aesthetascs on the antennula and the elongated male pleopod 1 exopod with a lobe on the inner lateral margin and up to six setae on the outer lateral margin. The new species most resembles B. olfersii (Brandt, 1833, but may be distinguished by lacking the lobe with six setae on the internal margin of the proximal extremity of the merus of pereiopod 7. Furthermore, we include B. olfersii in the subgenus Benthanoscia based on the examined material as described herein.Uma nova espécie de Benthana Budde-Lund, 1908, é descrita de material coletado no sul do Brasil. B. cairensis sp. nov. distingue-se das outras espécies do gênero por apresentar 17 estetascos na antênula e o exópode do pleópode 1 do macho alongado, com um lobo e portando seis setas na margem lateral externa. A nova espécie assemelha-se a B. olfersii (Brandt, 1833 em várias características, mas pode ser diferenciada pela ausência do lobo com seis setas na margem externa da extremidade proximal do mero do pereiópodo 7. Além disso, B. olfersii é incluída, neste trabalho, no subgênero Benthanoscia, com base no material examinado.

  5. The manca stages of Porcellio dilatatus Brandt (Crustacea, Isopoda, Oniscidea) Os estágios de manca de Porcellio dilatatus Brandt (Crustacea, Isopoda, Oniscidea)

    OpenAIRE

    Pedro E. D. Brum; Paula B. Araujo

    2007-01-01

    This paper presents the description of the three manca stages of the terrestrial isopod Porcelliodilatatus Brandt, 1833 (Porcellionidae). Ovigerous females were collected and kept in the laboratory under controlled conditions (23°C ± 1°C and 14:10 h light:darkness). After birth, mancas (M) were individually reared, and their development was observed. Stages M I, M II, and M III were described based on general characteristics, ommatidia, and appendages. The average development time of each sta...

  6. 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

    Directory of Open Access Journals (Sweden)

    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.

  7. Linking eye design with host symbiont relationships in pontoniine shrimps (Crustacea, Decapoda, Palaemonidae.

    Directory of Open Access Journals (Sweden)

    Nicola C Dobson

    Full Text Available Symbiosis is prevalent in the marine environment with many studies examining the effects of such interactions between host and symbiont. Pontoniine shrimps are a group whose ecology is characterised by symbiotic interactions. This investigation examines the gross morphology of Pontoniinae compound eyes and superficial optical parameters with reference to their symbiotic relationship or lifestyle category; free-living, ectosymbiont, endosymbiont (bivalves or endosymbiont (non-bivalves. The eye morphologies of free-living and ectosymbiotic species are very similar, yet differ from both forms of endosymbiotic species. Endosymbionts have significantly smaller and simpler eyes with larger facets and bigger interommatidial angles and eye parameters for increased sensitivity levels. However bivalve endosymbionts form an intermediary group between non-bivalve endosymbionts and ectosymbionts as a result of their more active lifestyle. The accessory eye or "nebenauge", although of uncertain function, commonly occurs in free-living Pontoniinae species but rarely in endosymbionts apart from in more primitive species. The variation in morphology reflects tensions between functional requirements and ecological pressures that have strongly influenced eye design in Pontoniinae.

  8. Mysids (Crustacea) from the salt pans of Mumbai, India, with a description of a new species

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A; Panampunnayil, S.U.

    from the related species by the presence of a distal suture in the antennal scale, lack of articulation on the exopod of the fourth male pleopod and the presence of spines on the endopod of the uropod. The new species, Indomysis nybini, is fairly common...

  9. Spatial distribution and general population characteristics of Pseudanchialina pusilla (Crustacea: Mysida) in the eastern Arabian Sea

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.

    observed during the NEM period (Table 4). In some males and females individuals measuring 2.8 mm, secondary sexual characters were not yet visible, while in some male and female measuring 2.6 and 2.5 mm respectively, secondary sexual characteristic were...

  10. Descriptions of five new species of Haplostylus (Mysidaceae crustacea) from South West Australia

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    and are well spaced. The interesting sexual dimorphism of the telson is another distinguishing character of the present species. In H.flagelliforma, the telson is similar in both sexes, while in the present species the females always have a greater number...

  11. From time-to space-traveller -tadpole shrimp Triops cancriformis (Crustacea: Notostraca)

    Science.gov (United States)

    Zierold, Thorid

    The Notostraca is a small ancient crustacean order dating back to the Carboniferous and possibly up to the Devonian period. In fact, there are Upper Triassic Triops fossils from Germany which are almost indistinguishable from the present Triops cancriformis and thus Triops is considered to be one of the best examples of evolutionary stasis or `living fossil'. Fossil records have shown that the occurrence of Triops is linked to strata resulting from inland freshwater bodies with alternating phases of flooding and drying out. Still today Notostraca species are known from ephemeral ponds and puddles throughout the world. Several Large Branchiopod species such as the European T. cancriformis present adaptations to desiccation, the main one being the production of thick-walled resting cysts. A high number of resting cysts is laid during the flooded period into the pond sediment or is fixed on plants during the adulthood. The drought resistant portion of cysts undergoes an extreme form of diapause. During this resting time the embryo is protected by different (cement)-layers against desiccation, UV-radiation and pressure. Thus their life cycle is perfectly adapted to extreme environments which resulted in the survival of more than 200 Million years. Among the Notostraca a wide range of reproductive modes are present including bisexual -the putatively ancestral state -, androdioecious and hermaphrodite populations. As hermaphroditism and androdioecy confer a colonisation advantage, Triops are suitable for populating experiments whatsoever. Triops is an ideal model organism due to their easy culture and breeding in the lab. Without any impact on the hatching success the resting cysts can easily be extracted from the soil and prepared for controlled experiments. Furthermore their biology has been studied in depth and optimal breeding conditions are known. The ancient group "travelled" successfully through time and is now ready for experiments in the outer space. At the moment Triops is considered to be included in upcoming astrobiolog-ical programs "Bio-Phobos" and "Biorisk-3" scheduled for 2010-2013. Questions focusing on the effects of cosmic rays on diapause, development without gravity, and the influence of the immense g forces during take off are of main interest.

  12. 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.

  13. Identification of the molecular components of a Tigriopus californicus (Crustacea, Copepoda) circadian clock.

    Science.gov (United States)

    Nesbit, Katherine T; Christie, Andrew E

    2014-12-01

    Copepods of the genus Tigriopus have been proposed as marine models for investigations of environmental perturbation. One rapidly increasing anthropogenic stressor for intertidal organisms is light pollution. Given the sensitivity of circadian rhythms to exogenous light, the genes/proteins of a Tigriopus circadian pacemaker represent a potential system for investigating the influences of artificial light sources on circadian behavior in an intertidal species. Here, the molecular components of a putative Tigriopus californicus circadian clock were identified using publicly accessible transcriptome data; the recently deduced circadian proteins of the copepod Calanus finmarchicus were used as a reference. Transcripts encoding homologs of all commonly recognized ancestral arthropod core clock proteins were identified (i.e. CLOCK, CRYPTOCHROME 2, CYCLE, PERIOD and TIMELESS), as were ones encoding proteins likely to modulate the core clock (i.e. CASEIN KINASE II, CLOCKWORK ORANGE, DOUBLETIME, PROTEIN PHOSPHATASE 1, PROTEIN PHOSPHATASE 2A, SHAGGY, SUPERNUMERARY LIMBS and VRILLE) or to act as inputs to it (i.e. CRYPTOCHROME 1). PAR DOMAIN PROTEIN 1 was the only circadian-associated protein not identified in Tigriopus; it appears absent in Calanus too. These data represent just the third full set of molecular components for a crustacean circadian pacemaker (Daphnia pulex and C. finmarchicus previously), and only the second obtained from transcribed sequences (C. finmarchicus previously). Given Tigriopus' proposed status as a model for investigating the influences of anthropogenic stressors in the marine environment, these data provide the first suite of gene/protein targets for understanding how light pollution may influence circadian physiology and behavior in an intertidal organism. PMID:25310881

  14. New hypogean cyclopoid copepods (Crustacea) from the Yucatán Peninsula, Mexico

    OpenAIRE

    Fiers, Frank; Reid, Janet W.; Iliffe, Thomas M.; Suárez-Morales, Eduardo

    1996-01-01

    Four previously unknown hypogean species of cyclopoid copepods were collected in cenotes and wells of the Yucatán Peninsula, Mexico. Diacyclops chakan sp. n. and D. puuc sp. n. differ from their congeners in combining 3-segmented swimming legs, 11-segmented antennules, and legs 1-4 endopodite segment 2 all with 2 setae. Species of Diacyclops rarely occur in tropical regions, and the Diacyclops described here are only the second and third species recorded from Mexico. The benthic D. puuc was f...

  15. New hypogean cyclopoid copepods (Crustacea) from the Yucatán Peninsula, Mexico

    NARCIS (Netherlands)

    Fiers, Frank; Reid, Janet W.; Iliffe, Thomas M.; Suárez-Morales, Eduardo

    1996-01-01

    Four previously unknown hypogean species of cyclopoid copepods were collected in cenotes and wells of the Yucatán Peninsula, Mexico. Diacyclops chakan sp. n. and D. puuc sp. n. differ from their congeners in combining 3-segmented swimming legs, 11-segmented antennules, and legs 1-4 endopodite segmen

  16. Towards Integrated Multi-Trophic Aquaculture: Lessons from Caprellids (Crustacea: Amphipoda)

    Science.gov (United States)

    Hachero-Cruzado, Ismael; González-Romero, Pablo; Jiménez-Prada, Pablo; Cassell, Christopher; Ros, Macarena

    2016-01-01

    The search for alternative live feed organisms and the progression of Integrative Multi-Trophic Aquaculture (IMTA) are currently being highly prioritised in EU strategies. Caprellids could potentially be an important exploitable resource in aquaculture due to their high levels of beneficial polyunsaturated fatty acids, fast growing nature and widespread distribution. Furthermore, since they are mainly detritivorous, they could be excellent candidates for integration into IMTA systems, potentially benefitting from uneaten feed pellets and faeces released by cultured fish in fish farms and sea-cage structures. Despite this, there is a lack of experimental studies to: (i) test inexpensive diets for caprellids, such as detritus, (ii) develop sustainable caprellid culture techniques and (iii) include caprellids in IMTA systems. The main aim of this study was to determine whether detritus (D) in the form of fish faeces provided an adequate diet for caprellids in comparison to other traditional diets, such as Artemia nauplii (A) or phytoplankton (P). Adult survival rate was shown to be significantly higher for caprellids fed with D. Conversely, hatchlings had the highest survival rate with A, although the juvenile growth rate and number of moults was similar in the three diets. With regard to lipid composition, caprellids fed with A had higher concentrations of Triacylglycerols (TAG) and Phosphatidylcholine (PC) while those fed with P or D were richer in polyunsaturated fatty acids, especially 22:6(n-3) (DHA). Interestingly, caprellids fed with D were also a rich source of 18:2(n-6) (LA), considered to be an essential fatty acid in vertebrates. It was found that detritus based mainly on fish faeces and uneaten feed pellets can be considered an adequate feed for adult caprellids, providing a source of both omega-3 (DHA) and omega-6 (LA) fatty acids. Hatchlings however seem to require an additional input of TAG and PC during juvenile stages to properly grow. PMID:27124465

  17. Pesticide resistance from historical agricultural chemical exposure in Thamnocephalus platyurus (Crustacea: Anostraca)

    International Nuclear Information System (INIS)

    Extensive pesticide usage in modern agriculture represents a considerable anthropogenic stressor to freshwater ecosystems throughout the United States. Acute toxicity of three of the most commonly used agricultural pesticides (Methyl Parathion 4ec, Tempo SC Ultra, Karmex DF, and DDT) was determined in two different wild-caught strains of the fairy shrimp Thamnocephalus platyurus. Fairy shrimp collected from playas surrounded by native grasslands were between 200% and 400% more sensitive than fairy shrimp derived from playas in agricultural watersheds for Methyl Parathion 4ec, Tempo SC Ultra, and Karmex DF, likely due to the development of resistance. Additionally, reduced sensitivity to DDT was observed among fairy shrimp from agriculturally-impacted playas as compared to those from native grassland-dominated playas. These data suggest that fairy shrimp inhabiting playas in agricultural regions have developed some degree of resistance to a variety of agrochemicals in response to historical usage. - This manuscript discusses the potential effects of long-term pesticide usage on the development of resistance and cross-resistance on a non-target aquatic invertebrate

  18. Redescription and first records from Brazil of Diacyclops uruguayensis Kiefer (Crustacea, Copepoda, Cyclopidae

    Directory of Open Access Journals (Sweden)

    Janet W. Reid

    1998-01-01

    Full Text Available Diacyclops uruguayensis Kiefer, 1935 is redescribed from specimens from Santa Catarina and Ceará, Brazil. These new records represent a significant range extension from southern Uruguay.

  19. Pigmentos carotenoides del camarón Artemesia longinaris Bate (Crustacea, Decapoda, Penaeidae)

    OpenAIRE

    Carreto, J.I.; Carignan, M.O.

    1984-01-01

    Caronetoids from caparace and internal organs of Artemesia longinaris were isolated and identified. The following carotenoid pigments were found in caparace: luteine, tunaxanthin diester, astaxanthin monoester and free astaxanthin. A much greater variety of pigments was isolated from internal organs: Ó- doradexanthin, a fucoxanthin derivate, chlorophylls degradation products and various xanthophylls in trace amounts. These pigments are of dietary origin. In the natural environment, A.longinar...

  20. The occurrence of Callinectes arcuatus ordway, 1863 (Crustacea, Decapoda, Portunidae in Bahia, Brazil

    Directory of Open Access Journals (Sweden)

    Edilson Pires de Gouvêa

    1987-01-01

    Full Text Available During the study of the Carcinofauna of the Bahian Coast, some Brachyura Portunidae were found. Some of these animals were Callinectes arcuatus Ordway, 1863 which has its distribution restricted to the Pacific Ocean, from California to Peru and the Galapagos Islands. This is the first occurrence of this species reported from the Atlantic Ocean and the Brazilian Coast (Bahia, 38º50'Wand 12º50'S.Durante o estudo da carcinofauna do litoral baiano, muitos Braquiuros Portunidae foram encontrados. Alguns destes animais foram Callinectes arcuatus Ordway, 1863 que possuia sua distribuição restrita da Califórnia ao Peru e Ilhas Galápagos, no Oceano Pacífico. Esta é a primeira ocorrência desta espécie no Oceano Atlântico e na Costa Brasileira. (Bahia, 12º50'S e 38º50'W.

  1. The Ostracoda (Crustacea) of the Tina Menor estuary (Cantabria, southern Bay of Biscay): Distribution and ecology

    Science.gov (United States)

    Martínez-García, Blanca; Pascual, Ana; Rodríguez-Lázaro, Julio; Martín-Rubio, Maite; Rofes, Juan

    2013-10-01

    Recent ostracods from the Tina Menor estuary (northern Spain, southern Bay of Biscay) have been analysed. Twenty-five species have been identified for the first time, 20 with living individuals during the sampling period. The most abundant species are Leptocythere castanea, Leptocythere porcellanea, Loxoconcha elliptica, Cytherois fischeri, and Hemicytherura hoskini, Leptocythere psammophila and Semicytherura aff. angulata. These species are grouped into four assemblages defining different environments: muddy inner estuary with euryhaline species (L. elliptica); middle estuary with silty sand flats and low marsh environments (L. castanea, L. porcellanea and C. fischeri); sandy outer estuary with marine characteristics (H. hoskini, S. aff. angulata, Leptocythere baltica and L. psammophila); and littoral to inner shelf environment (Caudites calceolatus, H. hoskini and Callistocythere murrayi). In the middle estuary, L. castanea also delimits sandy-silty low marshes, and L. porcellanea and C. fischeri the vegetated ecosystems. Multivariate analyses with the samples and species (cluster Q-type and detrended and canonical correspondence analysis) confirm that ostracod distribution in the Tina Menor estuary is controlled by sediment grain size and by the distance to the mouth of the estuary (associated to salinity). The geographical height in relation with mean tide levels (and therefore with emersion periods) also plays an important role in distribution. The results of this study confirm ostracod validity as tide-level markers due to the presence of C. fischeri below the MHWNT (mean high water neap tide), whereas L. castanea and L. porcellanea are present between the MHWNT and MHW (mean high water) levels. Ostracods can also indicate environmental changes due to human-influenced processes. Abundant individuals of L. elliptica in some areas of the middle estuary evidence discharges of lower-salinity water from a nearby fish farm. Ostracods from the marine shelf reach the inner estuary, but continental species are not provided by the rivers. The low river influence may be due to Nansa River flow regulation upstream, which hampers the transport of fluvial sediments, resulting in an increase in sand in the mudflat and low marshes, the latter fact confirmed by the numbers of L. castanea and L. porcellanea, much higher than in other estuaries in the southern Bay of Biscay.

  2. The complete mitogenome of Cherax monticola (Crustacea: Decapoda: Parastacidae), a large highland crayfish from New Guinea.

    Science.gov (United States)

    Gan, Han Ming; Tan, Mun Hua; Eprilurahman, Rury; Austin, Christopher M

    2016-01-01

    The complete mitochondrial genome of a highland freshwater crayfish, Cherax monticola, was recovered by shotgun sequencing. The mitogenome consists of 15,917 base pairs containing 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs and a non-coding AT-rich region. The base composition of C. monticola is 33.46% for T, 21.48% for C, 33.71% for A and 11.35% for G, with an AT bias of 67.17%. PMID:24617471

  3. The complete mitogenome of the crayfish Cherax glaber (Crustacea: Decapoda: Parastacidae).

    Science.gov (United States)

    Austin, Christopher M; Tan, Mun Hua; Croft, Laurence J; Gan, Han Ming

    2016-01-01

    The complete mitochondrial genome of Cherax glaber was sequenced using the HiSeq platform. The mitogenome consists of 15,806 base pairs containing 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs and a non-coding AT-rich region. The Cherax glaber has a base composition of 32.39% for T, 22.42% for C, 33.73% for A and 11.46% for G, with an AT bias of 66.12%. PMID:24484586

  4. The complete mitogenome of the red claw crayfish Cherax quadricarinatus (Von Martens, 1868) (Crustacea: Decapoda: Parastacidae).

    Science.gov (United States)

    Gan, Han Ming; Tan, Mun Hua; Austin, Christopher M

    2016-01-01

    The commercial freshwater crayfish Cherax quadricarinatus complete mitochondrial genome was recovered from partial genome sequencing using the MiSeq Personal Sequencer. The mitogenome has 15,869 base pairs consisting of 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs, and a non-coding AT-rich region. The base composition of C. quadricarinatus is 32.16% for T, 23.39% for C, 33.26% for A, and 11.19% for G, with an AT bias of 65.42%. PMID:24617485

  5. The complete mitogenome of the freshwater crayfish Cherax cainii (Crustacea: Decapoda: Parastacidae).

    Science.gov (United States)

    Austin, Christopher M; Tan, Mun Hua; Croft, Laurence J; Gan, Han Ming

    2016-01-01

    The complete mitochondrial genome of Cherax cainii was recovered from partial genome sequencing data using the HiSeq platform. The mitogenome consists of 15,801 base pairs (69% A + T content) containing 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs and a 783 bp non-coding AT-rich region. This is the second completely sequenced mitogenome from the genus Cherax after the first reported Cherax destructor mitogenome nearly a decade ago. PMID:24438281

  6. The complete mitochondrial genome of the American lobster, Homarus americanus (Crustacea, Decapoda).

    Science.gov (United States)

    Kim, Sanghee; Lee, Sang-Hwa; Park, Mi-Hyun; Choi, Han-Gu; Park, Joong-Ki; Min, Gi-Sik

    2011-06-01

    Although relatively a large number of the complete mitochondrial genome sequences have been determined from various decapod species (29 mtDNA sequences reported so far), the information for the infraorder Astacidea (including lobsters, crayfishes, and their relatives) is very limited and represented by only one complete sequence from the Australian freshwater crayfish species Cherax destructor. In this study, we determined the complete mitochondrial DNA sequence of Homarus americanus, the first representative of the family Nephropidae to be fully characterized. Comparison of the gene arrangement reveals that H. americanus mtDNA is identical to those of other pancrustacean species but differs from the other astacidean species (C. destructor). Based on these data, it can be assumed that an idiosyncratic gene order discovered in C. destructor mtDNA may be secondarily acquired from the ancestral lineage of the Astacidea. PMID:21740340

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

    Directory of Open Access Journals (Sweden)

    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.

  8. Six Pandalid Shrimps of the Genus Plesionika (Crustacea: Decapoda: Caridea) in Korea

    OpenAIRE

    Jung Nyun Kim; Jung Hwa Choi; Jeong-Hoon Lee; Joo Il Kim

    2012-01-01

    Based on samples collected from the Korean Exclusive Economic Zone (EEZ) during an investigation of fishery resources by the National Fisheries Research and Development Institute (NFRDI) from 2002 to 2010, alongside some supplemental material, six species of the genus Plesionika are identified: P. izumiae Omori, 1971, P. ortmanni Doflein, 1902, P. grandis Doflein, 1902, P. lophotes Chace, 1985, P. narval (Fabricius, 1787), and P. orientalis Chace, 1985. Of these, the last four species are new...

  9. Morphometric differences in two calanoid sibling species, Boeckella gracilipes and B. titicacae (Crustacea, Copepoda)

    OpenAIRE

    Patricio De los Ríos Escalante

    2012-01-01

    Calanoid copepods are abundant in South American inland waters and include widespread species, such as Boeckella gracilipes (Daday, 1902), which occurs from the Ecuador to Tierra del Fuego Island. This species occurs under various environmental conditions, and is found in oligotrophic lakes in Patagonia (39-54°S) and in shallow mountain lakes north of 39°S. The aim of the present study is to conduct a morphometric comparison of male specimens of B. titicacae collected in Titicaca and B. graci...

  10. Morphometric differences in two calanoid sibling species, Boeckella gracilipes and B. titicacae (Crustacea, Copepoda

    Directory of Open Access Journals (Sweden)

    Patricio De los Ríos Escalante

    2012-12-01

    Full Text Available Calanoid copepods are abundant in South American inland waters and include widespread species, such as Boeckella gracilipes (Daday, 1902, which occurs from the Ecuador to Tierra del Fuego Island. This species occurs under various environmental conditions, and is found in oligotrophic lakes in Patagonia (39-54°S and in shallow mountain lakes north of 39°S. The aim of the present study is to conduct a morphometric comparison of male specimens of B. titicacae collected in Titicaca and B. gracilipes collected in Riñihue lakes, with a third population of B. gracilipes collected in shallow ponds in Salar de Surire. Titicaca and Riñihue lakes are stable environments, whereas Salar de Surire is an extreme environment. These ponds present an extreme environment due to high exposure to solar radiation and high salinity levels. The results of the study revealed differences among the three populations. These results agree well with systematic descriptions in the literature on differences between the populations of Titicaca and Riñihue lakes, and population of Salar de Surire differs slightly from the other two populations. It is probable that the differences between the population of Salar de Surire and the other two populations result from the extreme environment in Salar de Surire. High exposure to solar radiation, high salinity and extreme variations in temperature enhance genetic variations that are consequently expressed in morphology.

  11. New genera and species of the marine isopod family Serolidae (Crustacea, Sphaeromatidea from the southwestern Pacific

    Directory of Open Access Journals (Sweden)

    Niel Bruce

    2009-08-01

    Full Text Available The marine isopod family Serolidae is reviewed for the oceanic regions of the tropical and subtropical southwestern Pacific, namely from off Lord Howe Island, Norfolk Island, northern Coral Sea, New Caledonia and Fiji. Two new genera are established: Sedorolis gen. n., monotypic, from New Caledonia and Myopiarolis gen. n., a widespread Southern Hemisphere genus with 11 (eight described species. The following new species are described: Heteroserolis pellucida (New Caledonia, Sedorolis simplex (New Caledonia, Myopiarolis koro (Fiji, M. systir (New Caledonia, M. norfanz (Lord Howe Plateau and off Norfolk Island, M. lippa (northern Coral Sea, and Thysanoserolis orbicula (New Caledonia. Keys are provided to the serolid genera and the species of Myopiarolis from the southwestern Pacific. The genus Caecoserolis Wägele, 1994 is redefined and restricted to the type species.

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

    Directory of Open Access Journals (Sweden)

    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.

  13. 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.

  14. Odors influencing foraging behavior of the California spiny lobster, Panulirus interruptus, and other decapod crustacea

    Energy Technology Data Exchange (ETDEWEB)

    Zimmer-Faust, R.K.; Case, J.F.

    1982-01-01

    Trapping experiments were conducted in the More Mesa coastal area of Santa Barbara, California, 4 km east of the U.C. Santa Barbara campus. Live intact and injured prey and excised tissues were placed in traps, in containers allowing odor release but preventing contacts with entering animals. Individuals of six prey species failed to attract lobsters when alive and intact, but some became attractive once injured. Excised tissues were the most effective baits. Abalone and mackerel muscle were attractive to lobsters but relatively nonattractive to crabs, while angel shark muscle was attractive to crabs but not to lobsters. Shrimp cephalothoraces were repellant to lobsters. Naturally occurring attractant and repellent tissues are thus identified and chemosensory abilities of lobsters and sympatric crabs are demonstrated to differ. Abalone muscle increased in attractivity following 1-2 days field exposure. Molecular weights of stimulants released by both weathered and fresh abalone were < 10,000 daltons with evidence suggesting that the 1000-10,000 dalton fraction may contribute significantly to attraction. Concentrations of total primary amines released from abalone muscle failed to differ from background levels, following an initial three (0-3h) period. Primary amines thus appear not to contribute directly to captures of lobsters, since animals were usually caught greater than or equal to 7 h after baits were positioned. Amino acids were the dominant contributors to present measurements of total primary amines, suggesting that these molecules may not direct lobster foraging behavior in the present experiments. 41 references, 4 figures, 8 tables.

  15. Diversity and Spatial Distribution of Extant Freshwater Ostracodes (Crustacea in Ancient Lake Ohrid (Macedonia/Albania

    Directory of Open Access Journals (Sweden)

    Julia Lorenschat

    2014-07-01

    Full Text Available We carried out an intensive sampling survey in ancient Lake Ohrid (Macedonia/Albania, covering all seasons, to determine total species number, relative species abundances and spatial distribution of Ostracoda. We identified 32 living species that belong to seven families (Candonidae, Ilyocyprididae, Cyprididae, Leptocytheridae, Limnocytheridae, Cytherideidae, and Darwinulidae and 15 genera (Candona, Fabaeformiscandona, Candonopsis, Cypria, Cyclocypris, Ilyocypris, Eucypris, Prionocypris, Bradleystrandesia, Herpetocypris, Dolerocypris, Amnicythere, Paralimnocythere, Cytherissa, and Darwinula. Six additional species were identified from empty carapaces and valves. Dominant families in Lake Ohrid were Candonidae and Limnocytheridae, representing 53% and 16% of all species, respectively. Prevalence of species flocks in these two families confirms the “young” ancient status of the lake. Amnicythere displays a preference for oligo-haline to meso-haline waters, but some species are found in saline environments, which suggests Lake Ohrid has a marine history. Recent studies, however, indicate fluvial/glaciofluvial deposition at the onset of Lake Ohrid sedimentation. Candona is the most diverse genus in Lake Ohrid, represented by 12 living species. Paralimnocythere is represented by five living species and all other genera are represented by one or two species. Reports of Candona bimucronata, Ilyocypris bradyi, Eucypris virens, Eucypris sp., Prionocypris zenkeri, Bradleystrandesia reticulate, Herpetocypris sp. 2, and Dolerocypris sinensis are firsts for this lake. Living ostracodes were collected at the maximum water depth (280 m in the lake (Candona hadzistei, C. marginatoides, C. media, C. ovalis, C. vidua, Fabaeformiscandona krstici, Cypria lacustris, C. obliqua and Amnicythere karamani. Cypria lacustris was overall the most abundant species and Cypria obliqua displayed the highest abundance at 280 m water depth. Principal environmental variables that influence ostracode distributions in Lake Ohrid are water depth and conductivity. In general, species richness, diversity and evenness were greater in waters <60 m deep, with highest values often found in the littoral zone, at depths <30 m. Candonids, however, displayed highest diversity in the sublittoral (30–50 m and profundal (50–280 m zones. The most frequent species encountered are taxa endemic to the lake (14 living species, which have a wide depth range (≤280 m, and display higher abundance with greater water depth. Non-endemic species were rare, limited to water depths <50 m, and were found mainly in the north part of the lake where anthropogenic pressure is high. Several cosmopolitan species were encountered for the first time, which suggests that these widespread species are new arrivals that may replace endemics as human impacts increase.

  16. Two Newly Recorded Species of the Genus Aoroides (Crustacea: Amphipoda: Aoridae from Korea

    Directory of Open Access Journals (Sweden)

    Jung, Tae Won

    2016-04-01

    Full Text Available Two aorid amphipods, Aoroides ellipticus Ariyama, 2004 and A. semicurvatus Ariyama, 2004 from shallow waters of South Korea are reported here. Aoroides ellipticus has the characteristic setation of gnathopod 1 and the elliptical shape of basis on pereopod 7, while A. semicurvatus can be easily distinguished from congeners by combined characters of the curved propodus on gnathopod 2 and the absence of marginal spines on outer ramus of uropod 3 in mature males. This paper redescribed these two aorids and provided a key to Korean Aoroides species.

  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...

  18. The unusual floatation collar around nauplii of certain parasitic barnacles (Crustacea: Cirripedia: Rhizocephala)

    DEFF Research Database (Denmark)

    Høeg, Jens Thorvald; Møller, Ole Sten; Rybakov, Alexey V.

    2004-01-01

    Nauplii of the rhizocephalan families Peltogastridae and Lernaeodiscidae carry a torus-shaped collar around the body. It consists of an exceedingly thin cuticle connected to the general body cuticle along a continuous narrow ridge. In nauplii of some species, the collar is very large and its surf...

  19. A new record of species of Serolis (Crustacea, Isopoda, Flabellifera from off southern Brazil

    Directory of Open Access Journals (Sweden)

    Plínio Soares Moreira

    1974-01-01

    Full Text Available The marine isopod species Serolis foresti Bastida & Torti, 1970, is reported from the southern Brazilian continental shelf. It is described the up to date unknown male. Few additional morphological informations are given on the female. The geographical distribution of the species is considerably extended northernwards, being the Lat. 23º S the new northernmost limit of occurrence of the species.O isópode marinho Serolis foresti Bastida & Torti, 1970, e pela primeira vez assinalado ao longo da plataforma continental centro-sul do Brasil. Descreve-se o macho, até então desconhecido, e redescreve-se parcialmente a fêmea, com algumas observações morfologicas inéditas. A distribuição geográfica da espécie é consideravelmente ampliada, passando a Lat. 23º S a ser agora o seu limite mais setentrional de ocorrência.

  20. Molting and cuticle deposition in the subterranean trichoniscid Titanethes albus (Crustacea, Isopoda

    Directory of Open Access Journals (Sweden)

    Miloš Vittori

    2012-03-01

    Full Text Available Terrestrial isopods are a suitable group for the study of cuticle synthesis and calcium dynamics because they molt frequently and have evolved means to store calcium during molt. Little data is currently available on molting in Synochaeta and subterranean isopods. We studied the molting dynamics in the subterranean trichoniscid Titanethes albus under laboratory conditions and performed a microscopic investigation of sternal CaCO3 deposits and the tergal epithelium during molt in this species. In accordance with its lower metabolic rate, molting in the laboratory is roughly 2–3 times less frequent in T. albus than would be expected for an epigean isopod under similar conditions. Animals assumed characteristic postures following the molt of each body half and did not consume the posterior exuviae after posterior molt. The structure of sternal calcium deposits and the ultrastructural characteristics of the epidermis during cuticle formation in T. albus are similar to those described in representatives of Ligiidae. During the deposition of the exocuticle, the apical plasma membrane of epidermal cells forms finger-like extensions and numerous invaginations. In the ecdysial space of individuals in late premolt we observed cellular extensions surrounded by bundles of tubules.

  1. A unique form of light reflector and the evolution of signalling in Ovalipes (Crustacea: Decapoda: Portunidae)

    OpenAIRE

    Parker, A. R.; McKenzie, D. R.; Ahyong, S.T.

    1998-01-01

    The first demonstration, to our knowledge, of an evolutionary shift in communication mode in animals is presented. Some species of Ovalipes display spectacular iridescence resulting from multilayer reflectors in the cuticle. This reflector is unique in animals because each layer is corrugated and slightly out of phase with adjacent layers. Solid layers are separated from fluid layers in the reflector by side branches acting as support struts. An effect of this reflector is that blue light is ...

  2. How many species of cladocerans (Crustacea, Branchiopoda are found in Brazilian Federal District?

    Directory of Open Access Journals (Sweden)

    Francisco Diogo Rocha Sousa

    2012-12-01

    Full Text Available AIM: This study aimed provides a checklist of cladocerans and also an evaluation of richness and species composition in the Federal District, Brazil. METHODS: Checklist of cladocerans was obtained evaluating data from the literature, from taxonomic collection (Elmoor-Loureiro's collection and from fauna surveys conducted over more than three decades in different types of aquatic environments. RESULTS: The 57 water bodies studied showed 56 species, of which 14 are new records. The number of species contained in the list displayed corresponds to 85% of what was expected for richness estimators. The highest number of species was observed in the lentic water bodies (52, which also presented the specific composition of fauna (R = 0.110; p = 0.016, possibly because there were samples taken among the aquatic vegetation. According to our understanding, some species may be subject to local extinctions because they inhabit water bodies located exclusively in urban areas, which can lead to a decline in richness. CONCLUSION: Thus, the results of this study can assist in monitoring aquatic environments and in selection of new areas for surveys of cladocerans in the Federal District.

  3. 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; Derby, Charles D.

    2005-01-01

    most potent single compounds being ammonium, adenosine-5'-monophosphate, taurine, glutamate, and aspartate. Cluster analysis indicated that the neurons constitute a heterogeneous population that could be placed into seven groups linked according to their most excitatory compound. These neurons 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 of...... chemosensory neurons in other crustacean appendages shows that neurons in the mouthparts have relatively broad tuning biased toward detecting and resolving high concentrations. Based on these comparisons, we suggest a functional distinction among the chemosensors on the different appendages: long distance...

  4. Physiological and behavioural responses of Gammarus pulex (Crustacea: Amphipoda) exposed to cadmium

    International Nuclear Information System (INIS)

    The aim of this study was to investigate the effects of cadmium on physiological and behavioural responses in Gammarus pulex. In a first experiment, cadmium LC50s for different times were evaluated in 264 h experiment under continuous mode of exposure (LC5096h = 82.1 μg L-1, LC50120h = 37.1 μg L-1, LC50168h = 21.6 μg L-1, LC50264h = 10.5 μg L-1). In a second experiment, the physiological and behavioural responses of the amphipod exposed to cadmium (0, 7.5 and 15 μg L-1) were investigated under laboratory conditions. The mortality and the whole body cadmium concentration of organisms exposed to cadmium were significantly higher than in controls. Concerning physiological responses, cadmium exposure exerted a significant decrease on osmolality and haemolymph Ca2+ concentration, but not on haemolymph Na+ and Cl- concentrations, whereas the Na+/K+-ATPase activity was significantly increased. Behavioural responses, such as feeding rate, locomotor and ventilatory activities, were significantly reduced in Cd exposed organisms. Mechanism of cadmium action and consequent energetic reallocation in favour of maintenance functions (i.e., osmoregulation) are discussed. The results of this study indicate that osmolality and locomotor activity in G. pulex could be effective ecophysiological/behavioural markers to monitor freshwater ecosystem and to assess the health of organisms

  5. The functional and physiological status of Gammarus fossarum (Crustacea; Amphipoda) exposed to secondary treated wastewater

    Energy Technology Data Exchange (ETDEWEB)

    Bundschuh, Mirco, E-mail: bundschuh@uni-landau.d [Institute for Environmental Sciences, University of Koblenz-Landau, Fortstrasse 7, D-76829 Landau, Rhineland-Palatinate (Germany); Zubrod, Jochen P.; Schulz, Ralf [Institute for Environmental Sciences, University of Koblenz-Landau, Fortstrasse 7, D-76829 Landau, Rhineland-Palatinate (Germany)

    2011-01-15

    Climate change scenarios predict lower flow rates during summer that may lead to higher proportions of wastewater in small and medium sized streams. Moreover, micropollutants (e.g. pharmaceuticals and other contaminants) continuously enter aquatic environments via treated wastewater. However, there is a paucity of knowledge, whether extended exposure to secondary treated wastewater disrupts important ecosystem functions, e.g. leaf breakdown. Therefore, the amphipod shredder Gammarus fossarum was exposed to natural stream water (n = 34) and secondary treated wastewater (n = 32) for four weeks in a semi-static test system under laboratory conditions. G. fossarum exposed to wastewater showed significant reductions in feeding rate (25%), absolute consumption (35%), food assimilation (50%), dry weight (18%) and lipid content (22%). Thus, high proportions of wastewater in the stream flow may affect both the breakdown rates of leaf material and thus the availability of energy for the aquatic food web as well as the energy budget of G. fossarum. - Micropollutants in wastewater cause functional and physiological alteration in a leaf-shredding amphipod.

  6. On a new genus and species of Hemicytheridae (Ostracoda, Crustacea from the southern Brazilian coast

    Directory of Open Access Journals (Sweden)

    Anderson L. M. de Morais

    2014-09-01

    Full Text Available This study is based on 62 samples of phytal and bottom sediments collected along rocky beaches (< 3 m water depth of the central and northern coasts of the state of Santa Catarina (26º10'/27º50'S – 48º26'/48º40'W, southern Brazil. Living and dead ostracodes distributed among 16 families were recovered. In this paper is emphasized one new hemicytherid genus and species that is described and richly illustrated: Auricythere sublitoralis gen. nov. and sp. nov. Some ecological and zoogeographical aspects of this new ostracode are briefly discussed.

  7. Functional morphology of the hepatopancreas of Palaemonetes argentinus (Crustacea: Decapoda) : influence of environmental pollution

    International Nuclear Information System (INIS)

    Morphological and functional state of hepatopancreas were analyzed in Palaemonetes argentinus from two environments with different pesticide concentrations. Los Padres lagoon (Argentina) is an area subjected to contamination due to the slow exchange of water, the shallow depth and the input of contaminated water. Prawns living in this lagoon accumulate high amounts of organochlorine pesticides in their tissues. Hepatopancreas of prawns from Canal 5, an adjacent shallow stream where the amount of pesticides is below toxic levels, and from Los Padres lagoon were processed by standard histological techniques with light microscopy and transmission electronic microscopy. At Los Padres lagoon, there were found important tissular alterations, such as intertubular infiltration of haemocytes and connective tissue, epithelial retraction in some tubules, and a folded basal lamina. Important necrotic desquamation, with cariolysis, cariorrexis and lack of cellular details were also observed. Numerous tubules presented an enlarged and irregular lumen with the epithelium atrophied or completely absent. In general, the lesions were particularly located in the medullar region of the organ. At the ultrastructural level, R and F cells were the most damaged. Both cell types had nuclear retraction, chromatin condensation and cytoplasmic lysis. Some R cells also had dilated mitochondria and numerous lysosomes, and the basal cytoplasm was nearly completely lysed. The hepatopancreas of prawns from Canal 5 did not evidence any alterations. The histopathological study of the hepatopancreas is a highly sensitive tool to evaluate the physiological condition of prawns and water quality. Other environmental conditions were similar, so it can be assumed that pollutants were the main cause of organ deterioration. (author)

  8. Two new species of Siriella (Crustacea-Mysidacea) from the southwest coast of Australia

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    stream_size 12 stream_content_type text/plain stream_name J_Plankton_Res_17_1939.pdf.txt stream_source_info J_Plankton_Res_17_1939.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  9. Morfología larval de la familia Grapsidae (crustacea, decapoda. bracjyura)

    OpenAIRE

    Cuesta Mariscal, Jose A.

    1999-01-01

    Para poder realizar estudios del plancton marino es necesario una correcta identificación de las especies que lo componen. Las fases larvarias de los decápodos suponen un porcentaje muy importante de la composición del plancton. La gran diferencia entre la morfología ... de las fases larvarias y el adulto es enorme, por lo tanto no se pueden deducir a que especie pertenecen las larvas por simple similitud. Para ello es necesario el estudio del desarrollo larvario en laboratorio partiendo de u...

  10. Colonization, population dynamics, predatory behaviour and cannibalism in Heterocypris incongruens (Crustacea: Ostracoda

    Directory of Open Access Journals (Sweden)

    Paolo MENOZZI

    2011-02-01

    Full Text Available We followed the artificial colonization of a temporary pond in Northern Italy by the freshwater ostracod Heterocypris incongruens. The species had not been found in the pond in previous years. In May 2009 we released five laboratory reared, genetically identical, parthenogenetic females and observed the population during colonization and growth until desiccation (May- July 2009 and two subsequent hydro-periods (February-March and May-July 2010. High population density was always reached in few weeks, although in late winter 2010 no ovigerous female was observed and in spring 2010 the population was recruited only from resting eggs. In all three hydro-periods swarms formed every day and could be easily seen near the border of the pond to the eye around the median time of the sun path. In laboratory observations, individuals sampled from the swarm forming population showed predatory behaviour: H. incongruens attack, kill and consume live, actively self-defending organisms (Chironomid and mosquito larvae. We also observed cannibalism among adult females. We found low fecundity and high mortality in females sampled from the crowded population and kept in low density laboratory conditions. We discuss how cannibalism, delayed egg hatching, fecundity loss and high mortality by crowding regulate high density populations of H. incongruens, a typical r strategy species. Key words:

  11. The complete mitogenome of the rock pool prawn Palaemon serenus (Heller, 1862) (Crustacea: Decapoda: Palaemonidae).

    Science.gov (United States)

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

    2016-09-01

    The mitochondrial genome of the rock pool prawn (Palaemon serenus), is sequenced, making it the third for genera of the family Palaemonidae and the first for the genus Palaemon. The mitogenome is 15,967 base pairs in length and comprises 13 protein-coding genes, 2 ribosomal subunit genes, 22 transfer RNAs and a non-coding AT-rich region. The P. serenus mitogenome has an AT bias of 58.97% and a base composition of 29.79% for T, 24.14% for C, 29.18% for A, and 16.89% for G. The mitogenome gene order of P. serenus is identical to Exopalaemon carinicauda. PMID:25693708

  12. On a collection of Isaeidae (Crustacea, Amphipoha) from the southern Indian region

    NARCIS (Netherlands)

    Rabindranath, P.

    1971-01-01

    Nine species of gammaridean amphipods, belonging to the family Isaeidae, are fully described and figured. Eight of these were collected from typical marine locations on the East and West coast of South India and one, namely Photis digitata K. H. Barnard, 1935, was obtained from a brackish water lake

  13. Male claspers in clam shrimps (Crustacea, Branchiopoda) in the light of evolution

    DEFF Research Database (Denmark)

    Kaji, Tomonari; Fritsch, Martin; Schwentner, Martin; Olesen, Jørgen; Richter, Stefan

    2014-01-01

    Male "clam shrimps" possess highly modified first (and second) trunk limbs for clasping the carapace of females during copulation. Claspers are present in all three clam shrimp taxa (Laevicaudata, Spinicaudata, and Cyclestherida) but despite striking similarities in their morphology and function......, the matter of their homology is controversial. In this study, we address the question of the homology and evolution of these structures by comparing the developmental transformation of an unspecialized trunk limb into a clasper. In addition, we study the musculature and the nervous system in trunk...

  14. The Miocene Cyprideis species flock (Ostracoda; Crustacea) of western Amazonia (Solimões Formation)

    Science.gov (United States)

    Gross, Martin; Ramos, Maria Ines F.; Piller, Werner E.

    2015-04-01

    The Miocene mega-wetland of western Amazonia holds a diverse, largely endemic aquatic invertebrate fauna (e.g., molluscs, ostracods). Among ostracods, the genus Cyprideis experienced a remarkable radiation. Micropalaeontologic investigations of a 400-m-long sediment core (~62 km SW Benjamin Constant, Amazonia, Brazil) permitted a taxonomic revision of about two-thirds of hitherto described Cyprideis species. Ostracod index species enabled a biostratigraphic allocation of the well succession to the Cyprideis minipunctata to Cyprideis cyrtoma biozones (late middle to early late Miocene age). The current study underlines once more Cyprideis' remarkable capability to produce species flocks and western Amazonian Cyprideis comply with the criteria of a species flock: i) endemicity: up to now not a single species is recorded in adjacent areas; ii) monophyly: although hardly verifiable to date and probably Amazonian Cyprideis is not monophyletic s.str., several closely related, quite rapidly evolving species are proved; iii) speciosity: due to the present study, 30 formally described species exist; several further species, left in open nomenclature, are recorded in the literature, which strongly hints to a much higher, still unrecorded species richness; iv) ecological diversity: based on rare sedimentologic cross-references, ecological diversity within a highly structured wetland is possible; the current results demonstrate the sympatric occurrence of up to 12 Cyprideis species, which may indicate adaptations to different microhabitats; v) habitat dominance: regularly Cyprideis holds more than >90 % in western Amazonian ostracod assemblages during the early and middle Miocene. Explanations for this extreme habitat monopolisation are still arguable and touch the highly disputed question about the nature of western Amazonia's environments during the Miocene. It seems, however, evident that a strictly actualistic approach to endemic Neogene Amazonian biota is highly problematic. This study was funded by Austrian Science Fund (FWF project P21748-N21).

  15. Diversity and zoogeography of Icelandic deep-sea Ampeliscidae (Crustacea: Amphipoda)

    Science.gov (United States)

    Dauvin, Jean-Claude; Alizier, Sandrine; Weppe, Adeline; Guðmundsson, Guðmundur

    2012-10-01

    A large collection of ampeliscids (15,454 specimens from 366 sampling sites) from Icelandic waters was identified to species and distributional patterns analysed. The specimens were sampled during the BIOICE programme, the main objective of which was to map the invertebrate species diversity within the Icelandic economical zone (758,000 km2). Nineteen species were identified: ten Ampelisca (8018 specimens), six Byblis (4887 specimens), three Haploops (1673 specimens), plus a complex of Haploops spp. (876 specimens). Four of these 19 species are new records for Icelandic waters: A. dalmatina Karaman, 1975 was previously known around the Faroe Islands; B. abyssi Sars, 1879 and B. affinis Sars, 1879 were known from the NE Atlantic and B. medialisMills (1971) from the NW Atlantic. The three most abundant species were B. minuticornis Sars, 1879, B. gaimardi (Kröyer, 1846) and A. uncinata Chevreux, 1887, while the three most frequently occurring species at all stations were H. setosa Boeck, 1871, A. uncinata and A. macrocephala Lilljeborg, 1852. Species were grouped according to three geographical patterns: northern species (six species), southern species (nine species) and circum-Icelandic species (four species). The species were also grouped according to three depth categories: nine species were confined to the continental shelf and the upper part of the continental slopes around Iceland; nine species had a wide bathymetric range and one species (A. islandica) occurred only in deep waters. Factors related to water depth exerted the main influence on ampeliscid distribution patterns around Iceland. A comparison of the Icelandic Ampeliscidae fauna with five areas of the North Atlantic Ocean showed a strong similarity to the fauna of Faroe Islands and a lesser similarity to the NW Atlantic fauna.

  16. The genus Bathyporeia Lindström, 1855, in western Europe (Crustacea: Amphipoda: Pontoporeiidae)

    OpenAIRE

    Udekem d’Acoz, d', C.

    2004-01-01

    The amphipod genus Bathyporeia Lindström, 1855, on the European Atlantic coasts is revised and new identification keys are provided. The importance of new characters such as the morphology of the first uropod is stressed. The following species are fully redescribed and illustrated: B. elegans Watkin, 1938, B. gracilis G.O. Sars, 1891, B. guilliamsoniana (Bate, 1857), B. nana Toulmond, 1966, B. pelagica (Bate, 1857), B. pilosa Lindström, 1855, B. sarsi Watkin, 1938, and B. tenuipes Meinert, 18...

  17. Evolution of morphology, ontogeny and life cycles within the Crustacea Thecostraca

    DEFF Research Database (Denmark)

    Høeg, Jens Thorvald; Perez-Losada, M; Glenner, H; Kolbasov, GA; Crandall, KA

    2009-01-01

    the advanced metamorphosis and endoparasitism known from the Rhizocephala and strongly indicated for the Facetotecta are the result of convergent evolution. We also discuss reproductive systems, which range from separate sexes, over hermaphrodites combined with a separate male sex (androdioecy), to...... pure hermaphroditism. It is concluded, as envisaged by Darwin, that the Thecostraca provide excellent opportunities for studying the evolution of a wide range of complex life history traits which can now be better analyzed and understood in a robust phylogenetic framework....

  18. Food ingestion and assimilation by Hyaie media (Dana, 1853) (Crustacea - Amphipoda)

    OpenAIRE

    Airton Santo Tararam; Hilda de Souza Lima Mesquita; Yoko Wakabara; Clóvis A. Peres

    1990-01-01

    The feeding of Hyale media was analysed under laboratory conditions in winter and summer temperatures. The results showed that assimilation rates increased following food ingestion rates and decreased when egestion rates increased. In winter temperatures no significant differences were found in the assimilation rates among developmental stages and sexes. In summer temperatures assimilation rates for ovigerous and non-ovigerous females were higher than those found for adult and young males. Al...

  19. The functional and physiological status of Gammarus fossarum (Crustacea; Amphipoda) exposed to secondary treated wastewater

    International Nuclear Information System (INIS)

    Climate change scenarios predict lower flow rates during summer that may lead to higher proportions of wastewater in small and medium sized streams. Moreover, micropollutants (e.g. pharmaceuticals and other contaminants) continuously enter aquatic environments via treated wastewater. However, there is a paucity of knowledge, whether extended exposure to secondary treated wastewater disrupts important ecosystem functions, e.g. leaf breakdown. Therefore, the amphipod shredder Gammarus fossarum was exposed to natural stream water (n = 34) and secondary treated wastewater (n = 32) for four weeks in a semi-static test system under laboratory conditions. G. fossarum exposed to wastewater showed significant reductions in feeding rate (25%), absolute consumption (35%), food assimilation (50%), dry weight (18%) and lipid content (22%). Thus, high proportions of wastewater in the stream flow may affect both the breakdown rates of leaf material and thus the availability of energy for the aquatic food web as well as the energy budget of G. fossarum. - Micropollutants in wastewater cause functional and physiological alteration in a leaf-shredding amphipod.

  20. Incidence of Lernaea (Crustacea: Copepoda parasitic in the Mashkid River Basin, Southeast of Iran

    Directory of Open Access Journals (Sweden)

    Mohammad Hashem Malekzehi

    2014-02-01

    Full Text Available In the present investigation, Lernaea parasite was reported in the examined fish species, collected from the Mashkid River basin, Southeast of Iran in 2012 and 2013. Lernaea parasites were isolated from the external surface of eye, fins, operculum and body of the Bangana dero, Cyprinion microphthalmus, Gonorhynchus diplocheilus (Cyprinidae, Aphanius dispar (Cyprinodontidae, Channa gachua (Channidae in different water bodies. The highest infection was found in native fish, B. dero with nine parasites in single specimen. The exotic fishes were not infected.

  1. First Records of Two Species of Crabs (Crustacea: Decapoda: Brachyura Collected from Southern Korea

    Directory of Open Access Journals (Sweden)

    Hyun Sook Ko

    2013-04-01

    Full Text Available Two species of crabs, Homola orientalis Henderson, 1888 and Pseudomicippe nipponica (Sakai, 1938, are described and illustrated for the first time in Korea. Homola orientalis was collected at 30 m depth by trap from Busan, and P. nipponica was collected on the intertidal region in Seongsanpo, Jejudo Island. Homola orientalis is the first species of its family in the region. The family Homoldae is characterized by a linea homolica on the carapace and they carry camouflage in the form of sponges or cnidarians with subchelate of the fourth ambulatory legs. The Korean brachyuran fauna now comprises 223 species including the new records from this study.

  2. [Abundance and body size of Menippe mercenaria (Crustacea: Brachyura), in artificial refuges in Quintana Roo, Mexico].

    Science.gov (United States)

    Cervantes-Martínez, A; Ramírez-González, A

    2001-01-01

    In Florida and Cuba the stone crab Menippe mercenaria (Say, 1818) is under strong fishing-pressure; nevertheless in the Mexican Caribbean it is considered as sub-utilized and poorly known resource. Artificial shelters ("condominios cubanos") were used to study relative abundance, age structure, claw length-carapace amplitude relation, and population in three seasons and four sectors at Bahía Ascension, Quintana Roo, Mexico. The abundance varied according to the sector and sampling season: population was higher in the south and during the north wind ("Nortes") season (January to March). The carapace amplitude was directly proportional to claw length (r2 = 0.83, 0.97 and 0.89; p < 0.05 in females, males and total, respectively). The results suggest that specimens with 37.5 and 67.5 mm of carapace amplitude are the most limited regarding refuge availability in the Bay. PMID:12189819

  3. 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...

  4. Long-term Hg pollution induced Hg tolerance in the terrestrial isopod Porcellio scaber (Isopoda, Crustacea)

    International Nuclear Information System (INIS)

    The aim of our work was to assess the pollution-induced community tolerance (PICT) of isopod gut microbiota and pollution-induced isopod population tolerance (PIPT). Animals collected from a chronically Hg polluted and an unpolluted location were exposed for 14 days to 10 μg Hg/g dry food under laboratory conditions. The lysosomal membrane stability, hepatopancreas epithelium thickness, feeding activity and animal bacterial gut microbiota composition were determined. The results confirm the hypothesis that the response to short-term Hg exposure differs for animals from the Hg polluted and the unpolluted field locations. The animals and their gut microbiota from the Hg polluted location were less affected by Hg in a short-term feeding experiment than those from the unpolluted environment. We discuss the pollution-induced population tolerance of isopods and their gut microbiota as a measure of effects of long-term environmental pollution. The ecological consequences of such phenomena are also discussed. - Isopods (Porcellio scaber) as well as their bacterial gut community from a mercury-polluted site are mercury tolerant

  5. Long-term Hg pollution induced Hg tolerance in the terrestrial isopod Porcellio scaber (Isopoda, Crustacea)

    Energy Technology Data Exchange (ETDEWEB)

    Lapanje, A. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Institute of Physical Biology, Veliko Mlacevo 59, 1290 Grosuplje (Slovenia)], E-mail: ales.lapanje@bf.uni-lj.si; Drobne, D. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Nolde, N. [Institute Jozef Stefan, Department of Environmental Sciences, Jamova 39, 1000 Ljubljana (Slovenia); Valant, J. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Muscet, B. [Institute of Physical Biology, Veliko Mlacevo 59, 1290 Grosuplje (Slovenia); Leser, V. [University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, 1000 Ljubljana (Slovenia); Rupnik, M. [Institute of Public Health, Prvomajska 1, 2000 Maribor (Slovenia); Faculty of Medicine, University of Maribor, Slomskov trg 15, 2000 Maribor (Slovenia)

    2008-06-15

    The aim of our work was to assess the pollution-induced community tolerance (PICT) of isopod gut microbiota and pollution-induced isopod population tolerance (PIPT). Animals collected from a chronically Hg polluted and an unpolluted location were exposed for 14 days to 10 {mu}g Hg/g dry food under laboratory conditions. The lysosomal membrane stability, hepatopancreas epithelium thickness, feeding activity and animal bacterial gut microbiota composition were determined. The results confirm the hypothesis that the response to short-term Hg exposure differs for animals from the Hg polluted and the unpolluted field locations. The animals and their gut microbiota from the Hg polluted location were less affected by Hg in a short-term feeding experiment than those from the unpolluted environment. We discuss the pollution-induced population tolerance of isopods and their gut microbiota as a measure of effects of long-term environmental pollution. The ecological consequences of such phenomena are also discussed. - Isopods (Porcellio scaber) as well as their bacterial gut community from a mercury-polluted site are mercury tolerant.

  6. GENETIC COMPARISONS OF GERMAN POPULATIONS OF THE STONE CRAYFISH, AUSTROPOTAMOBIUS TORRENTIUM (CRUSTACEA: ASTACIDAE

    Directory of Open Access Journals (Sweden)

    SCHUBART C. D.

    2006-01-01

    Full Text Available Austropotamobius torrentium (SCHRANK, 1803 is the smallest of the European native crayfish species and has probably never been of economic interest. It is confined to headwaters and adapted to cold water with high flow through and rocky environments. These properties make the stone crayfish a useful species for population genetics and phylogeographic studies. Representatives were collected from 18 localities throughout southern Germany and analysed with two mitochondrial genetic markers. Initial results revealed that German populations of A. torrentium from the Danube and Rhine tributaries share identical haplotypes in 528 basepairs of 16S rRNA and 658 basepairs of the COI gene. Rare haplotypes of the COI genes were occasionally encountered and apparently restricted to southwestern Bavaria. Only three variable sites were found over a length of 658 basepairs in 45 German, Swiss and Austrian stone crayfish resulting in five different haplotypes, with the prevalence of one most common haplotype. Here we show that in German populations rare haplotypes are not randomly distributed, but found in higher frequencies in the Bavarian Alps of the Allgäu and in adjacent Tyrol. On the other hand, stone crayfish population from the Bavarian Forest and the Rhine tributaries appear genetically impoverished, so far only showing the most common haplotype. Consequently, there are significant differences between the Allgäu populations and the rest of the German populations in haplotype frequencies, resulting in a relatively high FST value. This finding is of importance for future conservation efforts of stone crayfish populations in Germany and Austria.

  7. 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

    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

  8. Distribution and assemblages of large branchiopods (Crustacea: Branchiopoda of northern Western Ghats, India

    Directory of Open Access Journals (Sweden)

    Sameer M. Padhye

    2014-02-01

    Full Text Available The present study is a report on the distribution and assemblages of large branchiopods from the Western Ghats of Maharashtra. Different types of water bodies were sampled including pools on lateritic outcrops. Eight species of large branchiopods were found in 72 samples collected over a period of 4 years. We found 7 large branchiopod species in rock pools, while the cyclestheriid Cyclestheria hislopi was observed only in rivers and water reservoirs. In twenty-five percent of the samples multiple species co-occurred with a maximum of 4 species in a single sample. Streptocephalus dichotomus was the most commonly observed species while Streptocephalus sahyadriensis was noted only in rock pools. Altitude and aquatic vegetation were identified as important factors for the distribution of large branchiopods in the studied area. Triops granarius was the species most commonly found to be co-occurring with other species, followed by S. sahyadriensis. Cyclestheria hislopi and Eulimnadia indocylindrova always occurred alone. 

  9. Neuroanatomy of the optic ganglia and central brain of the water flea Daphnia magna (Crustacea, Cladocera).

    Science.gov (United States)

    Kress, Timm; Harzsch, Steffen; Dircksen, Heinrich

    2016-03-01

    We reveal the neuroanatomy of the optic ganglia and central brain in the water flea Daphnia magna by use of classical neuroanatomical techniques such as semi-thin sectioning and neuronal backfilling, as well as immunohistochemical markers for synapsins, various neuropeptides and the neurotransmitter histamine. We provide structural details of distinct neuropiles, tracts and commissures, many of which were previously undescribed. We analyse morphological details of most neuron types, which allow for unravelling the connectivities between various substructural parts of the optic ganglia and the central brain and of ascending and descending connections with the ventral nerve cord. We identify 5 allatostatin-A-like, 13 FMRFamide-like and 5 tachykinin-like neuropeptidergic neuron types and 6 histamine-immunoreactive neuron types. In addition, novel aspects of several known pigment-dispersing hormone-immunoreactive neurons are re-examined. We analyse primary and putative secondary olfactory pathways and neuronal elements of the water flea central complex, which displays both insect- and decapod crustacean-like features, such as the protocerebral bridge, central body and lateral accessory lobes. Phylogenetic aspects based upon structural comparisons are discussed as well as functional implications envisaging more specific future analyses of ecotoxicological and endocrine disrupting environmental chemicals. PMID:26391274

  10. Acute toxicity of Nigerian crude oil (Bonny Light to Desmocaris trispinosa (Crustacea, Palaemonidaec

    Directory of Open Access Journals (Sweden)

    P. Emeka Ndimele

    2011-12-01

    Full Text Available The acute toxic effects of a Nigerian crude oil (Bonny Light to freshwater shrimp, DesmocarisTrispinosa were studied in toxicity bioassay. The test organisms were exposed to crude oil in a staticrenewal bioassay for 96 hrs. There was an initial range-finding test to determine the concentrations ofcrude oil to be administered on the test organisms in the definitive test. Five concentrations of the crudeoil were prepared in the definitive test as 40, 80, 160, 240 and 320 mgL-1 and a control experiment (0mgL-1. The median lethal concentration (LC50 at 24-hr, 48-hr, 72-hr and 96-hr was 0, 0, 281.84 and120.23 mgL-1 respectively. The median lethal time (LT50 at crude oil concentrations of 160 mgL-1, 240mgL-1 and 320 mgL-1 were 89.5hrs, 80.7hrs and 53.3hrs respectively while the LT50 at concentrations of40 mgL-1 and 80 mgL-1 was 0hr. Mortality increased with increase in crude oil concentration and thedifference was significant (pD. trispinosa and may adversely affect other aquatic organisms.

  11. Phylogeny of the Anomura (Decapoda, Crustacea): Spermatozoa and spermatophore morphological evidence

    OpenAIRE

    Tudge, Christopher C.

    1997-01-01

    A phylogenetic analysis of selected anomuran, thalassinidean, and other decapod crustacean taxa, based on spermatozoal ultrastructural characters and spermatophore morphological characters, was performed and the following relationships of the taxa are elucidated from the trees produced. The Anomura are not a monophyletic assemblage, with the lomoid Lomis being exclusive of the remainder of the anomuran taxa, and the thalassinid Thalassina included in the anomuran clade. The synapomorphy joini...

  12. Complete mitochondrial genome of the blind vent crab Gandalfus puia (Crustacea: Bythograeidae) from the Tonga Arc.

    Science.gov (United States)

    Kim, Se-Joo; Moon, Jai-Woon; Ju, Se-Jong

    2016-07-01

    The brachyuran crab Gandalfus puia is a species endemic to the hydrothermal vent fields in the Tonga-Kermadec Arc. In order to understand G. puia at the genomic level, we sequenced its mitochondrial genome (mitogenome) and then compared to other bythograeids. The mitogenome is 15,548 bp in length and exhibits brachyuran-typical gene arrangement. Its protein-coding genes were very similar to other bythograeid species with respect to length, AT content and start and stop codons. Additionally, we compared the mitogenomes of Gandalfus and the closely related Austinograea. The inter-specific nucleotide divergence was 13.4% in Gandalfus and 13.7-14.0% in Austinograea. The inter-generic nucleotide divergence between Gandalfus and Austinograea was 16.3-19.7%. Based on the phylogenetic tree constructed with maximum likelihood and Bayesian inference, bythograeid crabs were recognized as the monophyletic taxon with the high supporting values (100% bootstrap proportions and 1.00 posterior probabilities). These results are useful for understanding the phylogenetic relationships and evolution of bythograeid crabs. PMID:26057012

  13. Morphological and molecular affinities of two East Asian species of Stenhelia (Crustacea, Copepoda, Harpacticoida

    Directory of Open Access Journals (Sweden)

    Tomislav Karanovic

    2014-05-01

    Full Text Available Definition of monophyletic supraspecific units in the harpacticoid subfamily Stenheliinae Brady, 1880 has been considered problematic and hindered by the lack of molecular or morphology based phylogenies, as well as by incomplete original descriptions of many species. Presence of a modified seta on the fifth leg endopod has been suggested recently as a synapomorphy of eight species comprising the redefined genus Stenhelia Boeck, 1865, although its presence was not known in S. pubescens Chislenko, 1978. We redescribe this species in detail here, based on our freshly collected topotypes from the Russian Far East. The other species redescribed in this paper was collected from the southern coast of South Korea and identified as the Chinese S. taiae Mu & Huys, 2002, which represents its second record ever and the first one in Korea. A fragment of the mtCOI gene was successfully PCR-amplified from two specimens of each species, which represents the first molecular data for this genus, and from additional 19 specimens belonging to six different species of other stenheliins from Korea and Russia. Reconstructed phylogenies confirm previously postulated monophyly of Stenhelia and polyphyly of the closely related genus Delavalia Brady, 1869. Average pairwise maximum likelihood distances between S. pubescens and S. taiae are only slightly above 10%, suggesting a very close relationship despite numerous newly discovered micro-morphological differences and despite macro-morphological similarities being probable plesiomorphies.

  14. Morphological and molecular affinities of two East Asian species of Stenhelia (Crustacea, Copepoda, Harpacticoida).

    Science.gov (United States)

    Karanovic, Tomislav; Kim, Kichoon; Lee, Wonchoel

    2014-01-01

    Definition of monophyletic supraspecific units in the harpacticoid subfamily Stenheliinae Brady, 1880 has been considered problematic and hindered by the lack of molecular or morphology based phylogenies, as well as by incomplete original descriptions of many species. Presence of a modified seta on the fifth leg endopod has been suggested recently as a synapomorphy of eight species comprising the redefined genus Stenhelia Boeck, 1865, although its presence was not known in S. pubescens Chislenko, 1978. We redescribe this species in detail here, based on our freshly collected topotypes from the Russian Far East. The other species redescribed in this paper was collected from the southern coast of South Korea and identified as the Chinese S. taiae Mu & Huys, 2002, which represents its second record ever and the first one in Korea. A fragment of the mtCOI gene was successfully PCR-amplified from two specimens of each species, which represents the first molecular data for this genus, and from additional 19 specimens belonging to six different species of other stenheliins from Korea and Russia. Reconstructed phylogenies confirm previously postulated monophyly of Stenhelia and polyphyly of the closely related genus Delavalia Brady, 1869. Average pairwise maximum likelihood distances between S. pubescens and S. taiae are only slightly above 10%, suggesting a very close relationship despite numerous newly discovered micro-morphological differences and despite macro-morphological similarities being probable plesiomorphies. PMID:24899857

  15. Morphological and molecular affinities of two East Asian species of Stenhelia (Crustacea, Copepoda, Harpacticoida)

    OpenAIRE

    Tomislav Karanovic; Kichoon Kim; Wonchoel Lee

    2014-01-01

    Abstract Definition of monophyletic supraspecific units in the harpacticoid subfamily Stenheliinae Brady, 1880 has been considered problematic and hindered by the lack of molecular or morphology based phylogenies, as well as by incomplete original descriptions of many species. Presence of a modified seta on the fifth leg endopod has been suggested recently as a synapomorphy of eight species comprising the redefined genus Stenhelia Boeck, 1865, although its presence was not known in S. pubesce...

  16. Rendimiento reproductivo de hembras de Cryphiops caementarius (Crustacea: Palaemonidae mantenidas con alimento natural

    Directory of Open Access Journals (Sweden)

    Magali Bazán

    2011-07-01

    Full Text Available El objetivo del presente trabajo fue determinar el rendimiento reproductivo de hembras de C. caementarius mantenidas con alimento natural. Se empleó 24 hembras inmaduras (5,2 cm y 2,0 g, acondicionadas en ocho acuarios (45 L y alimentadas durante dos meses de acuerdo a cada tratamiento, con pota (Dosidicus sp., almeja (Semele solida, poliqueto (Pseudonereis sp. y con alimento balanceado. El rendimiento reproductivo de las hembras fue mejorado cuando se alimentó con poliqueto y pota, lográndose la maduración entre 16 y 18 días con alta fecundidad (2627 y 1377 huevos g-1 y fertilidad (2566 y 1364 larvas g-1, respectivamente.

  17. Total mitochondrial genome of mantis shrimp, Squilloides leptosquilla (Brooks, 1886) (Crustacea: Stomatopoda: Squillidae) in Korean waters.

    Science.gov (United States)

    Kang, Hye-Eun; Kim, Jung Nyun; Yoon, Tae-Ho; Park, Kyeong Dong; Park, Won Gyu; Park, Hyun; Kim, Hyun Woo

    2016-07-01

    We characterized the complete mitochondrial genome of Squilloides leptosquilla (Brooks, 1886) collected from the southern waters of Korea, which is newly recorded into the Korean carcinological fauna. The total mitochondrial genome length of S. leptosquilla was 16,376 bp. This circular DNA encodes 13 proteins, two ribosomal RNAs, and 22 transfer RNAs, as well as a putative control region. Compared with other decapod crustacean mitochondrial genomes, the overall A + T content was relatively high (71.1%) as those among other stomatopod species. Nine and four protein-coding genes are encoded on the H-strand and on the L-strand, respectively. The short non-coding region (210 bp) between tRNA(Glu) and tRNA(Phe) may be the good candidate as the molecular marker to discriminate S. leptosequilla from other stomatopods. PMID:26176982

  18. Diversity and Spatial Distribution of Extant Freshwater Ostracodes (Crustacea) in Ancient Lake Ohrid (Macedonia/Albania)

    OpenAIRE

    Julia Lorenschat; Liseth Pérez; Alexander Correa-Metrio; Mark Brenner; Ullrich von Bramann; Antje Schwalb

    2014-01-01

    We carried out an intensive sampling survey in ancient Lake Ohrid (Macedonia/Albania), covering all seasons, to determine total species number, relative species abundances and spatial distribution of Ostracoda. We identified 32 living species that belong to seven families (Candonidae, Ilyocyprididae, Cyprididae, Leptocytheridae, Limnocytheridae, Cytherideidae, and Darwinulidae) and 15 genera (Candona, Fabaeformiscandona, Candonopsis, Cypria, Cyclocypris, Ilyocypris, Eucypris, Prionocypris, Br...

  19. A new species of the genus Linuparus White, from the South China Sea (Crustacea Decapoda)

    NARCIS (Netherlands)

    Bruce, A.J.

    1965-01-01

    The palinurid genus Linuparus White, 1847, has been represented by a single recent species, Linuparus trigonus (Von Siebold). The trawl survey of the northern shelf region of the South China Sea at present being carried out by the R.V. "Cape St. Mary" of the Fisheries Research Station, Hong Kong, ha

  20. Six Pandalid Shrimps of the Genus Plesionika (Crustacea: Decapoda: Caridea in Korea

    Directory of Open Access Journals (Sweden)

    Jung Nyun Kim

    2012-04-01

    Full Text Available Based on samples collected from the Korean Exclusive Economic Zone (EEZ during an investigation of fishery resources by the National Fisheries Research and Development Institute (NFRDI from 2002 to 2010, alongside some supplemental material, six species of the genus Plesionika are identified: P. izumiae Omori, 1971, P. ortmanni Doflein, 1902, P. grandis Doflein, 1902, P. lophotes Chace, 1985, P. narval (Fabricius, 1787, and P. orientalis Chace, 1985. Of these, the last four species are new to Korean marine fauna. The distributional range of P. narval extends to the East China Sea off Jeju Island. Excluding P. izumiae and P. ortmanni, the other four species are relatively rare in the seas around Korea. They are described and illustrated with color photographs. A key to the Korean species of Plesionika is also presented.

  1. 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

    resolve the phylogenetic relationship of the order Rhizocephala and elucidate the evolution of the different life history strategies found within the Rhizocephala, we have performed the first comprehensive phylogenetic analysis of the group. Our results indicate that Rhizocephala is monophyletic with a...... filter-feeding barnacle-like ancestor. The host-infective stage, the kentrogon larva, inserted in the lifecycle of the rhizocephalan suborder, Kentrogonida, is shown to be ancestral and most likely a homologue of the juvenile stage of a conventional thoracican barnacle. The mode of host inoculation found...... in the suborder Akentrogonida, where the last pelagic larval stage directly injects the parasitic material into the heamolymph of the host is derived, and has evolved only once within the Rhizocephala. Lastly, our results show that the ancestral host for extant rhizocephalans appears to be the...

  2. Spelaeomysis cochinensis, a new mysid (Crustacea: Mysidacea) from a prawn culture field in Cochin, India

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.; Viswakumar, M.

    ., the eighth species of the genus is described from a prawn culture field in Cochin, India. It is characterised by a pair of eye plates with few ommatidia and the fully spiny border of the telson. Introduction The material was collected during a survey... (Fig. 2); posterior margin emarginate, scale like prolongation of penultimate thoracic segment just fitting into posterior emargination of carapace and not overlapping. Eye plates sepa- rate, and quadrate with few disto-lateral ommatidia. First...

  3. Four new species of the genus Rhopalophthalmus (Mysidacea: Crustacea) from the northwest coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.; Biju, A.

    built. Carapace with dorso-median nodules; anterior margin lacking rostrum, postorbital spines prominent, keels prominent, cheeks sinuous. Eyes stout, extending to distal end of first segment of antennule, cornea occupying little more than half... of eye and wider than stalk (Figures 1, 2). Antennule more robust in male, first segment longer than rest of peduncle, outer distal angle drawn out and armed with few stout plumose setae, outer margin armed with row of ten long curved plumose setae...

  4. Mysidacea (Crustacea) from the Minicoy lagoon (Lakshadweep, India) with description of a new species of Anisomysis

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.; Prabhakaran, M.P.

    , extending to middle of first antennular segment and covering basal part of eye stalks in male (Figure 9); anterolateral corners of carapace rounded. Rostrum of female short, overreaching base of antennular peduncle (Figure 10). Eyes large, cornea globular..., 1994 from Japan but differs from it in the following points. (1) In A. minicoyensis, the rostrum extends to the middle of the first segment of the antennular peduncle and covers the basal part of the eye stalks. In A. ohtsukai the 5 rostrum does...

  5. Mysids (Crustacea) from the Exclusive Economic Zone of India with description of a new species

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Panampunnayil, S.U.

    from all the known species of the genus Pseuderythrops by the irregularly lobed cornea of the eye, narrow upturned rim of the anterior region of carapace and the absence of distal suture on the antennal scale. Three species, Boreomysis plebeja...

  6. Evolution of freshwater crab diversity in the Aegean region (Crustacea: Brachyura: Potamidae).

    Science.gov (United States)

    Jesse, Ruth; Grudinski, Melanie; Klaus, Sebastian; Streit, Bruno; Pfenninger, Markus

    2011-04-01

    The aim of this study was to estimate the influence of the palaeogeographic and climatic history of the Aegean region on the diversity of freshwater crabs of the genus Potamon and to test whether this area served as source or reservoir in species diversity. Necessary species delimitation was accomplished by phylogenetic analyses of the mitochondrial markers COX1 and ND1, partial 16S rRNA gene and the tRNALeu gene. We found 14 genetic lineages of which nine could be assigned to previously recognised species. Temporal estimates of the splitting pattern in the phylogeny of Potamon indicated that a combination of geological and climatic events influenced their diversification. Within Potamon, the lineages separated into a western group and an eastern group. This first split in the genus occurred approximately 8.3-5.5 Mya, thus possibly correlated with the Messinian salinity crisis. A likelihood approach to geographic range evolution suggested for most species, occurring in the Aegean area, an origin in the Middle East. Moreover, there were no insular endemics in the central Aegean archipelago, therefore low sea-levels during the Pleistocene glacial periods possibly enabled dispersal to these islands, but subsequent rise in sea-level did not cause speciation. Nevertheless, the diversification of most lineages occurred during the Pleistocene epoch thus coinciding with Quaternary fluctuations of the climate. PMID:21216297

  7. An overview of the limnetic Cyclopidae (Crustacea, Copepoda of the Philippines, with emphasis on Mesocyclops

    Directory of Open Access Journals (Sweden)

    Rey Donne S. Papa

    2013-08-01

    Full Text Available Approximately 120 (subspecies of Cyclopidae have been reported from South and Southeast (SE Asia, where the Philippine archipelago – with 16 (including two endemic taxa – is one of the least explored parts of the region. Our study, part of current efforts to assess freshwater biodiversity, was undertaken to update the diversity and geographic distribution of the cyclopid copepods living in the limnetic zone of the freshwater lakes in the Philippines. Examination of the samples from 22 lakes in five islands (Luzon, Mindoro, Cebu, Leyte and Mindanao revealed a novel species from lake Siloton (Mindanao, Mesocyclops augusti n. sp. The new species can be distinguished from the congeners by the surface ornamentation of the hindgut, among others. The same character state was found in a Mesocyclops from North Vietnam, which is provisionally identified as M. augusti n. sp., though the Vietnam and Mindanao specimens differ in a few (yet polymorphic in the close relatives characters. Mesocyclops microlasius Kiefer, 1981 endemic to the Philippines is redescribed, based on females and males from lake Paoay (North Luzon. Sister relationships of M. augusti n. sp. and M. microlasius were tested in a phylogenetic analysis that included the closely related Old World representatives of the genus. The max. parsimony trees show M. dissimilis Defaye et Kawabata, 1993 (East Asia as the closest relative of M. augusti n. sp. (Mindanao, Vietnam, and support sister relationship between M. geminus Holynska, 2000 (East Borneo and M. microlasius (Luzon, Mindanao. A mainland clade (M. francisci, M. parentium, M. woutersi, M. dissimilis, M. augusti appears in most reconstructions; all members of the clade occur in continental Asia though some species also live in islands that have never been connected to the SE Asian shelf. In most trees with the mainland clade the insular taxa (M. microlasius, M. geminus, M. friendorum form either a paraphyletic (basal to mainland or monophyletic sister group of the mainland clade. We also established the first records of Thermocyclops taihokuensis (Harada, 1931 in the Philippines (Luzon, so far known from East and Central Asia. In all, 11 taxa [Mesocyclops (4, Thermocyclops (4, Microcyclops (1, Tropocyclops (1 and Paracyclops (1] including only one endemic species (M. microlasius have so far been found in the limnetic waters. We expect significantly higher diversity and higher rate of endemism of the freshwater cyclopids in the littoral (paludal and subterranean habitats in the Philippines.

  8. Notes on some rare and interesting Cladocera (Crustacea: Branchiopoda: Anomopoda: Chydoridae from Deepor Beel, Assam, India

    Directory of Open Access Journals (Sweden)

    B.K Sharma

    2012-01-01

    Full Text Available Plankton samples collected from Deepor Beel, a Ramsar site of India, during August 2008-July 2010, revealed six rare and interesting Cladocera belonging to four genera of the family Chydoridae. The globally important elements include the Australasian Disperalona caudata; the Asian Kurzia (Rostrokurzia brevilabris; the Indo-Malayan Alona macronyx; and Leydigiopsis curvirostris which is known to occur elsewhere in North and South America. Kurzia (Rostrokurzia brevilabris is a new record from India while Alona guttata tuberculata, A. macronyx and Coronatella anodonta are new records from Assam. The documented species are briefly diagnosed and comments are made on their distribution.

  9. Microcrustacea (Crustacea: Branchiopoda of Deepor Beel, Assam, India: richness, abundance and ecology

    Directory of Open Access Journals (Sweden)

    B.K. Sharma

    2009-08-01

    Full Text Available Plankton samples collected from two sampling stations of Deepor Beel, an important floodplain lake of Assam and a Ramsar site of India, revealed 51 species of Microcrustacea and showed qualitative dominance of Cladocera (45 species. Microcrustacea comprised a significant quantitative component (45.6 � plus or minus 5.8 and 50.8 � plus or minus 4.5 % of zooplankton and exhibited bimodal and trimodal annual patterns with peaks during winter. Cladocera > Copepoda are important quantitative groups. ANOVA registered significant variation in species richness and abundance of Microcrustacea over time and between stations. Richness and abundance were inversely correlated with water temperature and rainfall, and positively correlated with specific conductivity and dissolved oxygen. Multiple regression registered significantly higher cumulative effects of ten abiotic factors on these two parameters. Our results are characterized by higher species diversity, higher evenness and lower dominance of Microcrustacea and show lack of distinct quantitative importance of individual species.

  10. Diversity of microcrustacea (Crustacea: Branchiopoda of Loktak Lake, a Ramsar site, Manipur, India

    Directory of Open Access Journals (Sweden)

    B.K. Sharma

    2009-11-01

    Full Text Available Microcrustacea of Loktak Lake (collected during Nov. 2002-Oct. 2004 reveal 57 species and show qualitative dominance of Cladocera (51 species. They indicate monthly richness ranging between 33�plus or minus 6 and 32� plus or minus 6 species, record 51.7-82.3 and 53.6-90.0% community similarities during two years respectively, and follow trimodal annual patterns with peaks during winter. The microcrustaceans (112� plus or minus 17 and 124� plus or minus 13 n/l form an important quantitative component (45.7� plus or minus 4.9 and 43.3� plus or minus 3.7 % of zooplankton and show broadly trimodal annual patterns with peak abundance during winter. Cladocera > Copepoda mainly contribute to their quantitative variations. ANOVA registers significant monthly variations of microcrustacea richness and significant annual and monthly variations of their abundance. Richness is positively correlated with dissolved oxygen and is negatively correlated with rainfall, hardness, chloride and total dissolved solids while abundance is negatively correlated with pH only. Multiple regressions indicate higher cumulative effect of 15 abiotic factors on richness and abundance. Our results indicate no definite periodicity of richness and abundance of microcrustacea or their constituent groups during two annual cycles and are characterized by their higher species diversity, higher evenness and lower dominance.

  11. First Report of Mud Shrimp Austinogebia wuhsienweni (Crustacea: Decapoda: Upogebiidae from Korean Waters

    Directory of Open Access Journals (Sweden)

    Lee, Kyu Hyun

    2014-10-01

    Full Text Available Specimens of Austinogebia wuhsienweni (Yu, 1931 previously recorded from China to Japan were collected at a manila clam farm of 0.5 m depth in Hongseong, Yellow Sea. They were briefly described and illustrations included color photographs, since this was the first record of this rare species from Korean waters. Three species of Upogebiidae are known from Korean waters: Upogebia major (De Haan, 1839, U. issaeffi (Balss, 1913, and A. wuhsienweni (Yu, 1931. They are similar to each other, however, the presence of the ventral spines of the rostrum, a proximal knob on the lateral margin of the uropodal endopod, and a longitudinal carina on the inner surface of the palm of the male first pereiopod can easily distinguish the present species from the two species of Upogebia.

  12. Marine pollution effects on the southern surf crab Ovalipes trimaculatus (Crustacea: Brachyura: Polybiidae) in Patagonia Argentina.

    Science.gov (United States)

    Lezcano, Aníbal Hernán; Rojas Quiroga, María Laura; Liberoff, Ana Laura; Van der Molen, Silvina

    2015-02-28

    We compared the carapace shape and thickness as well as the energy density of Ovalipes trimaculatus inhabiting areas comprising a gradient of marine pollution: high, moderate and undetected, in the Nuevo gulf (Patagonia Argentina). The carapace shape was evaluated by means of individual asymmetry scores (=fluctuating asymmetry) whereas the carapace thickness was assessed by measuring the carapace dry weight. The energy density was analyzed through its negative relationship with water content in muscle tissue. The individual asymmetry scores as well as the percentage of water content in muscle tissue were proportional to the marine pollution gradient, whereas the carapaces thickness did not differ among sampling sites. Our results are consistent with previous findings and demonstrate the direct effect of marine pollution on other taxa different from gastropods, cephalopods and polyplacophora and add to long-standing concerns about detrimental effects caused by marine pollution on the benthic community of the Nuevo gulf. PMID:25293645

  13. Distribution and abundance of mysid shrimps (Crustacea: Mysidacea) in the Northern Indian Ocean.

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A.; Jagadeesan, L.; Panampunnayil, S.U.

    Sea) at 5 different depth strata (1000–500 m, 500–300 m, 300 m to bottom of the thermocline (BT), BT to the top of the thermocline (TT), TT to the surface/mixed layer) using a Multi Plankton Net (Hydrobios; mouth area 0.25 m2, mesh size 200 µm... (15.3) 1 (0.2) 4 (0.2) TT–BT 181 (4.7) 6 (0.6) 29 (16.6) 105 (22.9) 263 (44.8) 12 (1.4) – 5 (0.9) 10 (0.4) BT–300 9 (0.3) 8 (0.8) – 3 (0.6) – 3 (0.4) – 14 (2.6) 7 (0.3) 300–500 – 1 (0.1) – – – 1 (0.1) – 2 (0.4) – 500–1000 – 1 (0.1) – – 1...

  14. Distribution and ecology of non-marine ostracods (Crustacea, Ostracoda from Friuli Venezia Giulia (NE Italy

    Directory of Open Access Journals (Sweden)

    Koen MARTENS

    2009-02-01

    Full Text Available From August 1981 to July 2007, 200 inland water bodies were sampled to gather information on the Recent ostracod fauna of Friuli Venezia Giulia (NE Italy. A total of 320 samples were collected from surface, interstitial and ground waters. Whenever possible, ostracod identification was performed at species level based on the morphology of both valves and limbs. Seventy-four taxa in 30 genera belonging to 9 different families (Darwinulidae, Candonidae, Ilyocyprididae, Notodromadidae, Cyprididae, Limnocytheridae, Cytheridae, Leptocytheridae and Xestoleberididae were identified. The maximum number of taxa per site was seven. The most common species was Cypria ophthalmica (133 records, followed by Cyclocypris ovum (86 records, C. laevis (49 records, Cypridopsis vidua (40 records and Notodromas persica (28 records. Of particular relevance is the occurrence of six species new to Italy: Microdarwinula zimmeri, Penthesilenula brasiliensis, Fabaeformiscandona wegelini, Pseudocandona semicognita, Candonopsis scourfieldi, and C. mediosetosa. Scanning electron microscopy images of valves are provided for most of the described taxa. Geographical distribution of ostracods and their occurrence in relation to environmental variables were examined. The results of this study indicate that Friuli Venezia Giulia hosts a very diverse ostracod fauna, representing a significant proportion of all ostracod taxa known thus far from Italy.

  15. Taxonomy, phylogeny, historical biogeography, and historical ecology of the genus Pontonia (Crustacea: Decapoda: Caridea: Palaemonidae)

    OpenAIRE

    Fransen, C.H.J.M.

    2002-01-01

    Species of the genus Pontonia Latreille, 1829, are distributed in tropical and subtropical waters around the world, living in association with either molluscan or ascidian hosts. In the present taxonomic revision, Pontonia sensu lato is divided into six genera: Pontonia sensu stricto; Ascidonia gen. nov., Rostronia gen. nov., Dactylonia gen. nov., Odontonia gen. nov., and Bruceonia gen. nov. A total of 29 species is described and figured, four of which are new to science: Pontonia pilosa spec...

  16. 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.

  17. Two new species of Anisomysis (Crustacea - Mysidacea) from the Lakshadweep archipilago

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    stream_size 8 stream_content_type text/plain stream_name J_Plankton_Res_15_1141.pdf.txt stream_source_info J_Plankton_Res_15_1141.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  18. Mineralization of 14C-labelled plant material by Porcellio scaber (Crustacea, Isopoda)

    International Nuclear Information System (INIS)

    Leaf litter was incubated in a mineral soil in the presence or absence of mature Porcellio scaber. The invertebrate caused an increase in the numbers of bacteria, ammonifying bacteria, actinomycetes and protozoa in the soil. The decomposition of 14C-labelled Lemna gibba was significantly increased by the presence of P. scaber as determined by the total label remaining in the soil and the changes in sugars. 14C-labelled faeces derived from L. gibba decomposed at a slower rate than the plant tissue from which it originated. (author)

  19. Majoid crabs community (Crustacea: Decapoda from infralittoral rocky/sandy bottom of Anchieta Island, Ubatuba

    Directory of Open Access Journals (Sweden)

    Fernando L. Mantelatto

    2004-06-01

    Full Text Available The aim of the present study was to characterize the composition of Majoidea crabs inhabiting the infralittoral rocky/sandy bottom of Anchieta Island (Ubatuba, from north coast of São Paulo State. Crabs were collected monthly during 1999 and 2000 by using SCUBA and cages. The occurrence of eight species of majoids (Epialtus brasiliensis, Mithraculus forceps, Mithrax braziliensis, Mithrax hispidus, Mithrax tortugae, Pelia rotunda, Pitho lherminieri and Stenorhynchus seticornis was registered and corresponded to 24.2% of total of majid crabs recorded in the coast of São Paulo State. Mithraculus forceps, Mithrax tortugae and Stenorhynchus seticornis were most abundant in samples and constituted populations that belonged to the brachyuran community of the studied area. The taxocoenosis of the area was dominated by M. forceps (57.62%. The occurrence of Mithrax braziliensis in the present study enlarged its south distribution to the São Paulo State.O objetivo do presente estudo foi caracterizar a composição dos caranguejos Majoidea habitantes do infralitoral rochoso/arenoso da Ilha Anchieta (Ubatuba, litoral norte do Estado de São Paulo. Os caranguejos foram coletados mensalmente durante 1999 e 2000, por mergulho autônomo e armadilhas. Foi registrada a ocorrência de oito espécies de caranguejos majóideos (Epialtus brasiliensis, Mithraculus forceps, Mithrax braziliensis, Mithrax hispidus, Mithrax tortugae, Pelia rotunda, Pitho lherminieri e Stenorhynchus seticornis o que corresponde a 24,2% do total de majóideos registrados para o litoral do Estado de São Paulo. Mithraculus forceps, Mithrax tortugae e Stenorhynchus seticornis constituem populações frequentes na comunidade da área de estudo. A taxoeconose da área foi dominada por M. foreceps (57,62%. A ocorrência de Mithrax braziliensis no presente estudo amplia sua distribuição sul para o Estado de São Paulo.

  20. Bio-ecological aspects of the hermit crab Paguristes calliopsis (Crustacea, Diogenidae from Anchieta Island, Brazil

    Directory of Open Access Journals (Sweden)

    Renata Biagi

    2006-09-01

    Full Text Available In southern Atlantic studies on hermit crab biology are scanty considering the local biodiversity. In this way, some population features of Paguristes calliopsis Forest and Saint Laurent, 1968 such as size frequency distribution, sex ratio and shell occupation in the natural environment were studied. Specimens were collected by means of scuba methods in the infralittoral area of the Anchieta Island. A total of 116 individuals were analyzed. Size measurements (minimum; maximum; mean shield length ± sd, respectively were 0.8; 4.5; 2.76 ± 0.79 mm for males and 2.28 ± 0.36 mm for females. The sex ratio was 1.47:1 in favor of males which prevailed in the largest size classes. The hermit crabs occupied shells from eleven gastropod species and Cerithium atratum (Born 1778 was significantly the most occupied one (75.86%. Significant correlations were not obtained in all regression analysis, demonstrating sexual differences on fitting of the occupied shells. In the studied area P. calliopsis population is small if compared with the other hermit crab populations. The shell utilization varies as a function of shell availability and hermit crabs interspecific competition, in relation to the other coexistent species.Os estudos sobre a biologia dos ermitões no Atlântico sul ocidental são escassos considerando-se a biodiversidade local. O presente trabalhou caracterizou a população do ermitão Paguristes calliopsis Forest and Saint Laurent, 1968 quanto à distribuição de freqüência de tamanho dos indivíduos, ao sex-ratio, e a ocupação das conchas no ambiente natural. Os exemplares foram coletados por mergulho autônomo na região infralitoral da Ilha Anchieta. Um total de 116 indivíduos foi analisado. O tamanho do comprimento do escudo cefalotorácico (mínimo; máximo; média ± sd, respectivamente dos indivíduos variou de: 0.8; 4.5; 2.76 ± 0.79 mm para machos e 2.28 ± 0.36 mm para fêmeas. O sex-ratio foi de 1.47:1 em favor dos machos, sendo estes os que prevaleceram nas maiores classes de tamanho. Os ermitões ocuparam conchas de 11 espécies de gastrópodes sendo Cerithium atratum (Born 1778 significativamente a concha mais ocupada (75.86%. Não foram obtidas correlações significativas em todas as análises de regressão, demonstrando diferenças entre os grupos sexuais quanto a adequação das conchas ocupadas. Na área estudada a população de P. calliopsis pode ser considerada pequena quando comparada com as outras populações coexistentes. O padrão de utilização de conchas variou em função da disponibilidade destas e da competição interespecífica.

  1. 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

  2. Amphipoda (Crustacea) from Palau, Micronesia: families Melphidippidae, Oedicerotidae, Photidae, Pleustidae, Podoceridae, Stenothoidae, Synopiidae and Talitridae.

    Science.gov (United States)

    Myers, A A

    2014-01-01

    Eleven species belonging to the families Melphidippidae, Oedicerotidae, Photidae, Pleustidae, Podoceridae, Stenothoidae, Synopiidae and Talitridae are recorded from Palau, Micronesia. Eight species are figured. One species is new to science and is described and figured. One species was previously known only from Australia, one only from Madagascar and one only from Fiji. PMID:24943185

  3. Amphipoda (crustacea) from palau, micronesia: families ampeliscidae, ampithoidae, aoridae, colomastigidae and cyproideidae.

    Science.gov (United States)

    Myers, Alan A

    2012-01-01

    12 species of amphipod in 5 families, collected from shallow reefs in Palau by S. DeGrave during 2002, are reported here. Of these, five species are new to science and Microdeutopus tridens Schellenberg (1938) is redescribed and transferred to the genus Bemlos Shoemaker (1925). The collection included several additional species in the genera Amphilochus Bate, 1862, Ampithoe Leach (1814), Bemlos, Byblis Boeck (1871), Colomastix Grube (1861) and Notopoma Lowry & Berents (1996), that were either incomplete or juvenile and could therefore not adequately be described. In addition, two new species of Plumithoe Barnard & Karaman (1991) are erected from the literature. Other families collected in Palau will be considered in later contributions. PMID:22679377

  4. Amphipoda (Crustacea) from Palau, Micronesia: Families Ampeliscidae, Ampithoidae, Aoridae, Colomastigidae and Cyproideidae

    OpenAIRE

    Alan Myers

    2012-01-01

    Abstract 12 species of amphipod in 5 families, collected from shallow reefs in Palau by S. DeGrave during 2002, are reported here. Of these, five species are new to science and Microdeutopus tridens Schellenberg (1938) is redescribed and transferred to the genus Bemlos Shoemaker (1925). The collection included several additional species in the genera Amphilochus Bate, 1862, Ampithoe Leach (1814), Bemlos , Byblis Boeck (1871), Colomastix Grube (1861) and Notopoma Lowry & Berents (1996), that w...

  5. Amphipoda (crustacea) from Palau, Micronesia: families Dexaminidae, Eusiridae, Hyalidae, Ischyroceridae, Leucothoidae and Lysianassidae.

    Science.gov (United States)

    Myers, A A

    2013-01-01

    Thirteen species of amphipod in the families Dexaminidae (1), Eusiridae (1), Hyalidae (1), Ischyroceridae (1), Leucothoidae (8) and Lysianassidae (1) are recorded from Palau in Micronesia. Of these, Ventojassa palauensis sp. nov., Leucothoe beobeldabensis sp.nov., L. pseudepidemos sp. nov., L. serratissima sp. nov., L. tumida sp. nov., L. whiteae sp. nov and Paranamixis dentidactylus sp. nov. are new to science and are described and figured. PMID:25277573

  6. Amphipoda (Crustacea from Palau, Micronesia: Families Ampeliscidae, Ampithoidae, Aoridae, Colomastigidae and Cyproideidae

    Directory of Open Access Journals (Sweden)

    Alan Myers

    2012-05-01

    Full Text Available 12 species of amphipod in 5 families, collected from shallow reefs in Palau by S. DeGrave during 2002, are reported here. Of these, five species are new to science and Microdeutopus tridens Schellenberg (1938 is redescribed and transferred to the genus Bemlos Shoemaker (1925. The collection included several additional species in the genera Amphilochus Bate, 1862, Ampithoe Leach (1814, Bemlos, Byblis Boeck (1871, Colomastix Grube (1861 and Notopoma Lowry & Berents (1996, that were either incomplete or juvenile and could therefore not adequately be described. In addition, two new species of Plumithoe Barnard & Karaman (1991 are erected from the literature. Other families collected in Palau will be considered in later contributions.

  7. Palaeo- and archaeostomatopods (Hoplocarida, Crustacea) from the Bear Gulch Limestone, Mississippian (Namurian), of central Montana

    OpenAIRE

    Jenner, Ronald A; Hof, Cees H.J.; Schram, Frederick R.

    1998-01-01

    The palaeostomatopod crustacean Bairdops beargulchensis Schram & Horner, 1978 (Malacostraca, Hoplocarida) from the Mississippian Bear Gulch Limestone is now seen as a taxonomic composite that arose from the confusion of specimens of two distinct hoplocarid species. These species are herein described as the palaeostomatopod Bairdops beargulchensis Schram & Horner, 1978 and a new species of archaeostomatopod, Tyrannophontes acanthocercus. quite distinct from the Pennsylvanian archaeostomatopod ...

  8. Palaeo- and archaeostomatopods (Hoplocarida, Crustacea) from the Bear Gulch Limestone, Mississippian (Namurian), of central Montana

    NARCIS (Netherlands)

    Jenner, Ronald A.; Hof, Cees H.J.; Schram, Frederick R.

    1998-01-01

    The palaeostomatopod crustacean Bairdops beargulchensis Schram & Horner, 1978 (Malacostraca, Hoplocarida) from the Mississippian Bear Gulch Limestone is now seen as a taxonomic composite that arose from the confusion of specimens of two distinct hoplocarid species. These species are herein described

  9. Length and weight relationship of laboratory reared penaeid prawn Penaeus monodon (Fabricius) (Crustacea: Penaeidae)

    Digital Repository Service at National Institute of Oceanography (India)

    Saldanha, C.M.; Chatterji, A.

    followed the cube law. The weight of the prawn increased at the rate of more or less cube of the length. The relationship was found to be significant (p less than 0.001). At 95% confidence limit the b values were between 3.0524 and 4.3691. ANOVA showed...

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

    OpenAIRE

    Luz Amelia Vega-Pérez; Koichi Ara; Tsui Hua Liang; Marcelo Mattos Pedreira

    1996-01-01

    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. faxo...

  11. First Record of Cleantioides planicauda (Crustacea: Isopoda: Holognathidae from South Korea

    Directory of Open Access Journals (Sweden)

    Gi-Sik Min

    2014-01-01

    Full Text Available Cleantioides planicauda (Benedict, 1899 has previously been recorded in China and Japan. In the present study, to our knowledge, we report for the first time the occurrence of this species in South Korea. Here, we provide detailed descriptions and illustrations of the diagnostic characteristics of C. planicauda. Further, for the first time, we determined the partial sequence of mitochondrial cytochrome c oxidase subunit 1 (CO1 gene of C. planicauda for molecular characteristic. Additionally, we provide a key to the Korean species and distribution of the genus Cleantioides. As a result of this study, four species of the genus Cleantioides, including C. planicauda, have now been recorded in South Korea.

  12. [Artemia sp. (Crustacea, Anostracea) as intermediate host of Eurycestus avoceti Clark, 1954 (Cestoda, Cyclophyllidea) (author's transl)].

    Science.gov (United States)

    Gabrion, C; MacDonald, G

    1980-01-01

    Examination of Artemia sp. (Crustacé, Anostracé) for natural infection by cysticercoids of Flamingolepis liguloides, Cestode of the Flamingo (Phoenicopterus ruber) shows the presence of three other cysticercoids of cestode parasites of the Flamingo in the hemocoele of the Branchiopode. A fourth one is reported as the cysticercoid of Eurycestus avoceti, Clark, 1954, which parasitizes the Avocet (Recurvirostra avosetta). The systematic position of this Cestode is always unknown. This report shows the importance of Artemia in the life cycle of Cestodes of Anseriforms and Charadriiforms birds in saline lagoons. PMID:7406422

  13. The iron-encrusted microbial community of Urothoe poseidonis (Crustacea, Amphipoda)

    Science.gov (United States)

    Gillan, David C.; Ribesse, Jérôme; de Ridder, Chantal

    2004-06-01

    A rust-coloured coating frequently covers the appendages and sternites of Urothoe poseidonis, an amphipod living in the burrow of the echinoid Echinocardium cordatum. Up to 80% of the collected amphipods were coated. In winter, coated amphipods were always more abundant than uncoated ones. In summer, uncoated specimens predominated. The aspect, location and development of the coating are similar in juveniles and adults. EDAX analyses and Prussian blue testing indicate that the rust-coloured coating contains iron oxyhydroxide minerals with trace metals and phosphorus. Scanning electron microscopy shows that the iron coating harbours bacterial filaments related to Beggiatoaceae (3 morphotypes were observed). Protozoans, possibly Peritrichia of the families Rovinjellidae or Vaginicolidae (one morphotype), were also observed on pereopods VI and VII. The formation of the iron coating and its potential role in the biology of the amphipod are discussed.

  14. The iron-encrusted microbial community of Urothoe poseidonis (Crustacea, Amphipoda)

    OpenAIRE

    Gillan, D. C.; Ribesse, J.; De Ridder, C.

    2004-01-01

    A rust-coloured coating frequently covers the appendages and sternites of Urothoe poseidonis, an amphipod living in the burrow of the echinoid Echinocardium cordatum. Up to 80% of the collected amphipods were coated. In winter, coated amphipods were always more abundant than uncoated ones. In summer, uncoated specimens predominated. The aspect, location and development of the coating are similar in juveniles and adults. EDAX analyses and Prussian blue testing indicate that the rust-coloured c...

  15. new species of the crab genus Zozymodes (Crustacea: Decapoda: Xanthidae from Guam.

    Directory of Open Access Journals (Sweden)

    Lasley, R.M., Jr.

    2013-04-01

    Full Text Available new species of xanthid crab, Zozymodes sculptus sp. nov.,from Guam is described and illustrated. Zozymodes sculptus is distinguished from its congeners Z. cavipes (Dana, 1852a, Z. nodosus Klunzinger, 1913, Z. pumilus (Hombron & Jacquinot, 1846, Z. xanthoides (Krauss, 1843, and Z. demani Odhner, 1925, by its unusual raised crests of the carapace, two anterior-pointing anterolateral teeth, deep furrow formed by parallel crests on the superior margin of the chelae, and proportionately more narrow carapace.

  16. Seasonal distribution of Calanus sinicus (Copepoda, Crustacea) in the East China Sea

    Institute of Scientific and Technical Information of China (English)

    XU Zhaoli; CHEN Bijuan

    2007-01-01

    On the basis of the four-season investigation in 23°30'~33°N and 118°30'~128°E of the East China Sea from 1997 to 2000, the seasonal distribution of Calanus sinicus was studied with aggregation intensity, regression contribution and other statistical methods. It was inferred that C. sinicus's predominance presented from winter to summer, especially in spring and summer, because its dominance amounted to 0.62 and 0.29 respectively. The percent of its abundance in copepod abundance was 76.71% in summer, greater than 66.60% in spring, greater than 19.02% in winter, greater than 4.02% in autumn. The occurrence frequency in winter and spring was 83.08% and 93.89%, higher than that in summer and autumn, 76.71% and 73.87%. Compared with other dominant species of copepods, C. sinicus's contribution to the copepod abundance was obviously greater than that of the other species in winter, summer and spring, but smaller in autumn. C. sinicus tended to have an aggregated distribution. The clumping index peaked in summer (50.19), followed in spring (19.60), declined in autumn (13.18) and was the lowest in winter (3.04). The abundance changed in different seasons and areas, relating to temperature but not salinity in spring and autumn, to salinity but not temperature in summer; to neither temperature nor salinity in winter. In spring and summer, its high abundance area was often located in the mixed water mass formed by the Taiwan Warm Current, the Huanghai Sea Cold Water Mass, the coastal water masses and the Changjiang Dilute Water. In spring and autumn, its abundance was affected by the warm current, as well as the runoff from continental rivers affected it in summer. It can be inferred that C. sinicus was adapted to wide salinity and temperature, as a euryhalinous and eurythermous species in the East China Sea.

  17. 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

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

    OpenAIRE

    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) establishing Cinetorhynchus, a new subgenus of Rhynchocinetes, (5) giving new locality and host records for Hippolyte commensalis, (6) establishing that dacqueti is the correct name for the western subs...

  19. Larval descriptions of the family Porcellanidae: A worldwide annotated compilation of the literature (Crustacea, Decapoda).

    Science.gov (United States)

    Vela, María José; González-Gordillo, Juan Ignacio

    2016-01-01

    For most of the family Porcellanidae, which comprises 283 species, larval development remains to be described. Full development has been only described for 52 species, while part of the larval cycle has been described for 45 species. The importance of knowing the complete larval development of a species goes beyond allowing the identification of larval specimens collected in the plankton. Morphological larval data also constitute a support to cladistic techniques used in the establishment of the phylogenetic status (see Hiller et al. 2006, Marco-Herrero et al. 2013). Nevertheless, the literature on the larval development of this family is old and widely dispersed and in many cases it is difficult to collect the available information on a particular taxon. Towards the aim of facilitating future research, all information available on the larval development of porcellanids has been compiled. Following the taxonomic checklist of Porcellanidae proposed by Osawa and McLaughlin (2010), a checklist has been prepared that reflects the current knowledge about larval development of the group including larval stages and the method used to obtain the larvae, together with references. Those species for which the recognised names have been changed according to Osawa and McLaughlin (2010) are indicated. PMID:27081332

  20. Spatial patterns and seasonal fluctuations of the intertidal Caprellidae (Crustacea: Amphipoda) from Tarifa Island, Southern Spain

    OpenAIRE

    Guerra García, José Manuel; Baeza-Rojano Pageo, Elena; Cabezas Rodríguez, María del Pilar; Pacios, Isabel; Díaz Pavón, Juan José; García Gómez, José Carlos

    2009-01-01

    Tarifa Island is located in the Strait of Gibraltar, between the Mediterranean and Atlantic. The unique biogeographical position, together with the substrate heterogeneity and the protection degree resulting from its condition of mari - ne reserve, has contributed to maintain very diverse intertidal ecosystems at their rocky shores. Under absence of anthropogenic influence, we have studied the fluctuations of macroalgae and associated caprellids during two years (December 2005 to Decembe...

  1. Ecdysteriod titers during the molt cycle of the blue crab resemble those of other crustacea

    International Nuclear Information System (INIS)

    Callinectes sapidus is the only true crab (brachyuran) whose pattern of ecdysteroid titers has been described as departing from the pattern seen in other decapods. While ecdysteroids in other crabs reach a peak just prior to ecdysis, those of C. sapidus were claimed to reach their maxima after ecdysis. The data reported here challenge these findings. Ecdysteroids were measured in hemolymph, ovaries, and whole animal extracts of blue crabs using a radioimmunoassay. In hemolymph and whole animals, ecdysteroid levels rose during premolt to a maximum at stage D3. Ecdysteroids declined rapidly from late premolt stage D4 through postmolt stage A2, increased slightly at postmolt stage B, and returned to low levels where they remained during intermolt stage C. Ecdysteroid levels in males and immature females were not significantly different but mature females, having reached a terminal anecdysis, had signifincatly lower ecdysteroid levels. Ovaries of mature females accumulated ecdysteroids during vitellogenesis while the concentration of ecdysteroids in hemolymph was low

  2. Identification and characterisation of hemocyanin of the fish louse Argulus (Crustacea: Branchiura).

    Science.gov (United States)

    Pinnow, Pauline; Fabrizius, Andrej; Pick, Christian; Burmester, Thorsten

    2016-02-01

    Hemocyanin transports oxygen in the hemolymph of many arthropod species. Within the crustaceans, this copper-containing protein was thought to be restricted to Malacostraca, while other crustacean classes were assumed to employ hemoglobin or lack any respiratory protein. Only recently it has become evident that hemocyanins also occur in Remipedia and Ostracoda. Here we report for the first time the identification and characterisation of hemocyanin in the fish louse Argulus, which belongs to the class of Branchiura. This finding indicates that hemocyanin was the principal oxygen carrier in the stem lineage of the pancrustaceans, but has been lost independently multiple times in crustacean taxa. We obtained the full-length cDNA sequences of two hemocyanin subunits of Argulus foliaceus by a combination of RT-PCR, RACE and Illumina sequencing of the transcriptome. In addition, one full-length and one partial cDNA sequence were derived from the transcriptome data of Argulus siamensis. Western blot analysis confirmed the presence of at least two hemocyanin subunits in A. foliaceus, which are expressed at the mRNA level at a 1:3.5 ratio. The addition to the branchiuran hemocyanin subunits to a multiple sequence alignment of arthropod, hemocyanins improved the phylogenetic resolution within the pancrustacean hemocyanins. Malacostracan, ostracod and branchiuran hemocyanins are distinct from the hexapod and remipede hemocyanins, reinforcing the hypothesis of a close relationship of Remipedia and Hexapoda. Notably, the ostracod hemocyanins are paraphyletic with respect to the branchiuran hemocyanins, indicating ancient divergence and differential loss of distinct subunit types. PMID:26515963

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

    OpenAIRE

    HORKÁ I.; De Grave, S; Fransen, C.H.J.M.; Petrusek, A; Duris, Z.

    2016-01-01

    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 phy...

  4. Genetic characterization of Artemia tibetiana (Crustacea: Anostraca)

    OpenAIRE

    Abatzopoulos, T.J.; Kappas, I.; Bossier, P.; Sorgeloos, P.; Beardmore, J. A.

    2002-01-01

    The brine shrimp Artemia consists of a number of bisexual species and a large number of parthenogenetic forms, which collectively, inhabit a wide range of hypersaline habitats. A recently described species (A. tibetiana) from a carbonate lake (Lagkor Co) in Tibet at an altitude of 4490 m has been tested with New World (A. franciscana USA, and A. franciscana feral population Vietnam) and Old World species (A. salina, A. urmiana, A. sinica) for cross fertility. These tests show complete inferti...

  5. Biodiversity and Biogeography of Chthamalid Barnacles from the North-Eastern Pacific (Crustacea Cirripedia.

    Directory of Open Access Journals (Sweden)

    Benny K K Chan

    Full Text Available The biogeography and ecology of the species of Chthamalus present on the west coast of America are described, using data from 51 localities from Alaska to Panama, together with their zonation on the shore with respect to that of other barnacles. The species present were C. dalli, Pilsbry 1916, C. fissus, Darwin, 1854, C. anisopoma Pilsbry 1916 and four species in the C. panamensis complex. The latter are C. panamensis Pilsbry, 1916, C. hedgecocki, Pitombo & Burton, 2007, C. alani nom. nov. (formerly C. southwardorum Pitombo & Burton, 2007 and C. newmani sp. nov.. These four species were initially separated by enzyme electrophoresis. They could only be partially separated by DNA bar coding but may be separated using morphological characters.

  6. Two new species of Urothoe (Crustacea, Amphipoda, Gammaridea From The East Johor Islands Archipelago, Malaysia

    Directory of Open Access Journals (Sweden)

    Azman Abdul Rahim

    2011-03-01

    Full Text Available Two new species of urothoid amphipods from Pulau Sibu and Pulau Tinggi, Johor are described and illustrated. The specimens of Urothoe sibuensis new species were collected by vertical haul plankton net and is distinctively different from other existing Urothoe species by these combination of special characters; similar gnathopods 1–2 with short and stout propodus expanded into poorly defined palms; large eyes and epimeron 3 smooth. Urothoe tinggiensis new species as collected using an airlift suction sampler at seagrass area is characterized by its different gnathopodal configuration with setose dactylus of 5th pereopod; eyes minute; carpus is wider than merus in the 5th pereopod; subquadrate coxa 4; merus and carpus of pereopods 6–7 are linear.

  7. External morphology of Lightiella monniotae (Crustacea, Cephalocarida) in the light of Cambrian 'orsten' crustaceans

    DEFF Research Database (Denmark)

    Olesen, Jørgen; Haug, Joachim T.; Maas, Andreas;

    2011-01-01

    -shaped head shield, the anterior three head appendages resembling those of a nauplius larva, or the trunk-limb-like second maxilla. Cephalocarida have even been suggested to represent the sister taxon to all other Eucrustacea. Presence of possibly plesiomorphic characters, however, does not necessarily point...... does not hold only for cephalocarids. Retention of its plesiomorphic shape and function in the Cephalocarida remains, however, noteworthy. Cephalocarids are still little studied and incompletely known, especially their external morphology. By examining several adults and one young specimen of...

  8. Comportamiento reproductivo y mutilaciones en el cangrejo de las rocas Grapsus grapsus (Linnaeus, 1758 (Crustacea, Decapoda

    Directory of Open Access Journals (Sweden)

    Leonardo Romero

    2013-06-01

    Full Text Available El presente trabajo analiza información de las mudas y observaciones del comportamiento reproductivo de G. grapsus, relacionando las frecuencias de mutilaciones y el comportamiento caní- bal observado en las cópulas. Las colectas de mudas y observaciones sobre las cópulas se llevaron a cabo entre diciembre de 1990 y diciembre de 2001, en 200 m de una orilla rocosa al sur de la Bahía de Ancón, Lima, Perú. G. grapsus vive en grupos de número variable y asociados a grietas donde los individuos buscan refugio. El comportamiento de cortejo observado fue el de "búsqueda-intercepción" he incluyó diferencias como la defensa de territorios no temporales, largas persecusiones e intercepción por varios machos. Un total de 312 cópulas fueron observadas siendo más frecuentes durante el verano. Un total de once intentos de cópula produjeron la muerte de los individuos, siete fueron machos. En todo el periodo de estudio se colectaron un total de 8421 mudas de las cuales 418 presentaban mutilaciones o heridas en el cefalotórax o abdomen. No se observan diferencias significativas entre las tallas de mutilados de ambos sexos. El 73% de las mudas mutiladas presentan una sola mutilación, el 20% presentan dos mutilaciones y el 6% tres; se encontraron mudas hasta con siete apéndices mutilados. Las frecuencias de mutilaciones son significativamente mayores en machos. Las mutilaciones de las quelas y la segunda pata caminadora son más frecuentes en machos, mientras que en las hembras las mutilaciones de la cuarta y tercera pata caminadora son más frecuentes. Se propone que las mutilaciones se producen durante los intentos de cópula, principalmente por diferencias entre el tamaño de los individuos.

  9. Histological and ultrastructural investigation of the female reproductive system of Argulus bengalensis Ramakrishna, 1951 (Crustacea: Branchiura).

    Science.gov (United States)

    Banerjee, Anirban; Saha, Samar Kumar

    2016-06-01

    In order to understand branchiuran reproductive biology, it is imperative to know the sites of oogenesis and oocyte maturation, locate the accessory reproductive glands, and identify the fertilization site with the present knowledge of the sperm transfer mechanism of the genus Argulus. With these objectives, we attempted to describe the female reproductive system of Argulus bengalensis using serial histological sections through the ovaries and associated ducts in the transverse, longitudinal, and sagittal planes. The reproductive organs include a median ovary, one pair of ovarian lumina, a median oviduct, and a pair of collateral accessory glands. A duct from each of the collateral accessory glands leads into the proximal part of the median oviduct, which opens to the exterior through a genital opening at the distal end. The glandular secretion presumably contributes to the jelly coat of the egg. The ovary is bound with a tunica propria which extends further diametrically inside the ovary forming the paired lumina. The lumina are confluent into the median oviduct. Two distinct areas, the germarium and differentiating zones, are clearly distinguishable within the ovary. The tunica propria itself houses the oogonia within a matrix, serving as the germarium. Transmission electron micrograph reveals that the matrix is made of collagen. The collagen matrix confers elasticity to the tunica propria to accommodate the postvitellogenic oocytes within the ovarian lumen. The differentiating zone is situated in between the germarium: dorsally it is covered with a chromatophore layer. The ovary is ensheathed by a circum ovarian striated muscle. The presence of spermatophores in the ovarian lumen indicates the fertilization site. J. Morphol. 277:707-716, 2016. © 2016 Wiley Periodicals, Inc. PMID:26991011

  10. Nannastacidae (Crustacea: Cumacea) from the Malayan shallow waters (South China Sea)

    NARCIS (Netherlands)

    Petrescu, Iorgu

    1997-01-01

    Four new species from the South China Sea are described: Nannastacus muelleri n.sp., Nannastacus wisseni n.sp., Scherocumella fagei n.sp. and Scherocumella malayensis n.sp. The descriptions of further 15 known species are complemented with new information ( Campylaspis amblyoda Gamo, 1960, Cumella c

  11. Axially aligned organic fibers and amorphous calcium phosphate form the claws of a terrestrial isopod (Crustacea).

    Science.gov (United States)

    Vittori, Miloš; Srot, Vesna; Žagar, Kristina; Bussmann, Birgit; van Aken, Peter A; Čeh, Miran; Štrus, Jasna

    2016-08-01

    Skeletal elements that are exposed to heavy mechanical loads may provide important insights into the evolutionary solutions to mechanical challenges. We analyzed the microscopic architecture of dactylus claws in the woodlice Porcellio scaber and correlated these observations with analyses of the claws' mineral composition with energy dispersive X-ray spectrometry (EDX), electron energy loss spectroscopy (EELS) and selected area electron diffraction (SAED). Extraordinarily, amorphous calcium phosphate is the predominant mineral in the claw endocuticle. Unlike the strongly calcified exocuticle of the dactylus base, the claw exocuticle is devoid of mineral and is highly brominated. The architecture of the dactylus claw cuticle is drastically different from that of other parts of the exoskeleton. In contrast to the quasi-isotropic structure with chitin-protein fibers oriented in multiple directions, characteristic of the arthropod exoskeleton, the chitin-protein fibers and mineral components in the endocuticle of P. scaber claws are exclusively axially oriented. Taken together, these characteristics suggest that the claw cuticle is highly structurally anisotropic and fracture resistant and can be explained as adaptations to predominant axial loading of the thin, elongated claws. The nanoscale architecture of the isopod claw may inspire technological solutions in the design of durable machine elements subjected to heavy loading and wear. PMID:27320700

  12. 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). PMID:25807292

  13. Short notes and reviews A Storthyngura (Crustacea, Isopoda) from the Bellingshausen Sea, Antarctica

    NARCIS (Netherlands)

    Brandt, Angelika

    2000-01-01

    During the expedition ANT XI/3 with RV Polarstern 17 multiple corers were taken in the Bellingshausen Sea. From this material only a single, immature isopod was sorted. This specimen is a manca II of a presumably new species of the genus Storthyngura. However, as it is immature and only a single spe

  14. Marine interstitial Amphipoda and Isopoda (Crustacea) from Santiago, Cape Verde Islands

    NARCIS (Netherlands)

    Stock, Jan H.; Vonk, Ronald

    1992-01-01

    Three species of Amphipoda are recorded from interstices of a marine beach on the island of Santiago, Cape Verde Archipelago: Cabogidiella littoralis n. gen., n. sp. (Bogidiellidae), Psammogammarus spinosus n. sp. (Melitidae), and Idunella sketi Karaman, 1980 (Liljeborgiidae). The latter, widely dis

  15. The biology of species of Serolis (Crustacea, Isopoda, Flabellifera: reproductive behavior of Serolis polaris Richardson, 1911

    Directory of Open Access Journals (Sweden)

    Plínio Soares Moreira

    1973-01-01

    Full Text Available An account based on observations of the reproductive behavior of Serolis polaris is presented. Correlative additional information obtained from the examination of a large number of preserved specimens is discussed. Both the pre-copulatory behavior, and the copulatory position are described. Pre-adult females show sexual escape behavior. The pair of pereopods II are the only clasping appendages utilized in copulation. They are especially morphologically structured to perform this function. Marks, cuts and sores may be produced on the females by the rubbing movements of the clasping pereopods. Experiments show that when mature, males and females do not ingest food. A full discussion of all these behavioral aspects connected with reproduction is provided.O presente trabalho relata as observações sobre o comportamento reprodutivo de Serolis polaris Richardson, 1911. Informações correlatas adicionais, obtidas pelo exame de grande número de espécies, complementam diversos aspectos relacionados a eventos que ocorrem na época da reprodução. Descreve-se o comportamento pré-copulatório, assim como, a posição de copulação. Fêmeas pré-adultas apresentam comportamento de escape à aproximação inadequada dos machos, em suas tentativas de copulação. O pereopodo II é o apêndice que mantém a fêmea em posição de copulação, daí apresentar modificações morfológicas adaptadas a execução dessa função específica. Cicatrizes e anomalias diversas podem ser produzidas nas fêmeas pela subquela do pereópodo II do macho. Numerosas experiências demonstraram que machos e fêmeas não mais se alimentam ao atingirem a maturação sexual. Finalmente, os diversos aspectos do comportamento reprodutivo são detalhada e amplamente discutidos.

  16. 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.

  17. Model-based analysis of causes for habitat segregation in Idotea species (Crustacea, Isopoda)

    OpenAIRE

    Strer, Maximilian; Hammrich, Arne; Gutow, Lars; Moenickes, Sylvia

    2016-01-01

    On the shore of the rocky island of Helgoland (North Sea) two closely related isopod species, Idotea balthica Pallas, 1772, and Idotea granulosa Rathke, 1843, share a similar fundamental niche but inhabit well-separated habitats. Idotea balthica inhabits floating algae at the sea surface and accumulations of decaying algae on the seafloor, whereas I. granulosa primarily occurs in intertidal macroalgal belts. In laboratory experiments on individually reared isopods I. balthica outperformed I. ...

  18. Distinguishing characters of Niphargus gebhardti Schellenberg, 1934 and Niphargus molnari Mehely, 1927 (Crustacea: Amphipoda: a clarification

    Directory of Open Access Journals (Sweden)

    Angyal, D

    2013-06-01

    Full Text Available Two endemic Niphargus species, N. gebhardti Schellenberg, 1934 and N. molnari Méhely, 1927 are known from two caves of the Mecsek Mts. (SW Hungary. The species are morphologically close to each other and differ only in few characters. Although, the original descriptions contain only scattered information and few drawings, more characters can be found in the additional literature. The purpose of this paper is to summarize the available distinguishing morphological characters and to provide sufficient drawings to ease the identification of N. gebhardti and N. molnari.

  19. The toxicological effects of thiamethoxam on Gammarus kischineffensis (Schellenberg 1937) (Crustacea: Amphipoda).

    Science.gov (United States)

    Uğurlu, Pelin; Ünlü, Erhan; Satar, Elif İpek

    2015-03-01

    Neonicotinoids are a new group of insecticides, and little is known about their toxicity to nontarget freshwater organisms an potential effects on freshwater ecosystems. The aim of this study is to establish the acute toxicity and histopathological effects of thiamethoxam-based pesticide on the gill tissue of Gammarus kischineffensis. In this study G. kischineffensis samples were exposed to 2.5, 5, 7.5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90 and 100mg/l of commercial grade thiamethoxam for 96 h. The 24, 48, 72 and 96 h LC50 values were determined as 75.619, 23.505, 8.048 and 3.751 mg/l respectively. In histopathological study the individuals were exposed to 0.004, 0.04 and 0.4 mg/l thiamethoxam concentrations for 14 days. The results showed that the most common changes at all doses of thiamethoxam were vacuolization and hemostatic infiltration in the gill tissue of G. kischineffensis. PMID:25710849

  20. Description of the first species of Metharpinia (Crustacea: Amphipoda: Phoxocephalidae from Brazil

    Directory of Open Access Journals (Sweden)

    Luiz F. Andrade

    2015-02-01

    Full Text Available A new amphipod species of Metharpinia Schellenberg, 1931 is described from Campos Basin, southeastern Brazilian coast. The material was collected with van Veen grab from unconsolidated substratum, off the mouth of the Paraíba do Sul River. The new species can be distinguished from its congeners by presenting a strongly constricted rostrum and a slender palp of maxilla 1. There are four species in Metharpinia from the South Atlantic: M. dentiurosoma Alonso de Pina, 2003, M. grandirama Alonso de Pina, 2003 and M. iado Alonso de Pina, 2003, and Metharpinia taylorae sp. nov. This is the first record of a species of the genus from Brazilian waters.

  1. Distinguishing characters of Niphargus gebhardti Schellenberg, 1934 and Niphargus molnari Mehely, 1927 (Crustacea: Amphipoda): a clarification

    OpenAIRE

    Angyal, D.; Balázs, G.

    2013-01-01

    Two endemic Niphargus species, N. gebhardti Schellenberg, 1934 and N. molnari Méhely, 1927 are known from two caves of the Mecsek Mts. (SW Hungary). The species are morphologically close to each other and differ only in few characters. Although, the original descriptions contain only scattered information and few drawings, more characters can be found in the additional literature. The purpose of this paper is to summarize the available distinguishing morphological characters and to provide su...

  2. Maeridae from the Indo-Pacific: Elasmopus, Leeuwinella gen. nov., Maeropsis, Pseudelasmopus and Quadrimaera (Amphipoda: Crustacea).

    Science.gov (United States)

    Hughes, Lauren E

    2015-01-01

    Twenty-two species of Maeridae including the new genus, Leeuwinella, and eight new species are described from Indo-Pacific waters. Leeuwinella mistakensis gen. et sp. nov. from southern Western Australia has dorsal carinae and serrate epimeral margins on pleonites 1-3 and mandibular palp article 3 concave; this significant combination of characters justifies erection of a new genus. Elasmopus coxacallus sp. nov., with a castelloserrate posterior margin of pereopod 7 presents a novel character for the genus, which contains over 100 described species. Elasmopus incomptus sp. nov. and E. norfolkensis sp. nov. are also described from Norfolk Island, South Pacific, while new distribution records are provided for E. gracilis Schellenberg, 1938, E. integer Myers, 1989, and E. molokai J.L. Barnard, 1970 from northwestern Australia, and E. souillacensis Appadoo & Myers, 2003, from the Kermadec Islands. New distribution records for Maeropsis griffini (Berents, 1983) from Bedout Island in Western Australia are the first of the species outside the Queensland type locality and new records of M. thetis (Lowry & Springthorpe, 2005) from mainland Australia to Tasmania and across the Tasman Sea extending its range. Pseudelasmopus walkerae sp. nov. is described from Norfolk Island, and is the second species recorded in the genus, previously known only from Mauritius. Lastly, three new Quadrimaera species, Q. gregoryi, Q. brownorum and Q. vallaris, along with eight known Quadrimaera species, are reported from various locations extending their distributions in the Indo-Pacific. PMID:26701562

  3. Morphology and evolution of the respiratory apparatus in the family Eubelidae (Crustacea, Isopoda, Oniscidea).

    Science.gov (United States)

    Paoli, Pasquino; Ferrara, Franco; Taiti, Stefano

    2002-09-01

    The morphology of the respiratory apparatus in the pleopodal lungs of the family Eubelidae was investigated. The family is a monophyletic group including more than 240 species in 53 genera (three of which are nomina dubia), mostly distributed in the Afrotropical Region (tropical Africa and Arabian Peninsula). In all the Eubelidae, except for the monospecific genus Parelumoides and two species of the genus Elumoides, the exopods of pleopods have lungs. All the pulmonary morphologies present in the entire suborder Oniscidea are found: 1) uncovered lungs, composed of a pleated respiratory surface, directly exposed to the air (Atracheodillo-type) or partially enclosed within the appendage (Synarmadilloides-type); 2) covered lungs with several spiracles and respiratory trees, housed within the appendages, with spiracles surrounded by a specialized, nonrespiratory, structure (perispiracular area) (Eubelum- and Somaloniscus-types); 3) covered lungs with only one spiracle, with or without perispiracular area, and one respiratory tree (Aethiopopactes- and Periscyphis-types), which in taxa with Periscyphis-type lung crosses the insertion of the appendage and penetrates into the pleon with bundles of respiratory tubules. The evolution of the various types of lungs is discussed. It is concluded that the two main evolutionary lines, i.e., uncovered lungs and covered lungs, originated independently from an ancestral respiratory structure-the semilunar area. A first mechanism of development of the semilunar area by folding of its surface produced the Atracheodillo-type (all folds coplanar with the surface of the exopod) and Synarmadilloides-type (folds partly coplanar and partly intraflexed inside the exopod) uncovered lungs. A second mechanism of development by tubular invagination of the cuticle of the semilunar area produced the polyspiracular Eubelum-type lungs (numerous arborescent invaginations) and the monospiracular Aethiopopactes-type lungs (only one arborescent invagination), probably passing through a common intermediate pattern. From the common pattern, both the poly- and monospiracular types would have inherited the characteristic concave cell arrangement of the perispiracular area. The Somaloniscus-type and Periscyphis-type lungs are forms specialized for arid environments, directly derived from the Eubelum-type and Aethiopopactes-type, respectively. PMID:12125066

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

    OpenAIRE

    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 provided.

  5. 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. PMID:25707411

  6. First records of parasitic copepods (Crustacea, Siphonostomatoida) from marine fishes in Korea.

    Science.gov (United States)

    Venmathi Maran, B A; Soh, H Y; Hwang, U W; Chang, C Y; Myoung, J G

    2015-06-01

    The knowledge of the biodiversity of parasitic copepods in South Korea is increasing. Interestingly we report here, some parasitic copepods considered as the first record of findings from Korea. Nine species of parasitic copepods (Siphonostomatoida) including six genera of three different families [Caligidae (7), Lernaeopodidae (1), Lernanthropidae (1)] were recovered from eight species of wild fishes in Korea: 1) Caligus hoplognathi Yamaguti & Yamasu, 1959 (♀, ♂) from the body surface of barred knifejaw Oplegnathus fasciatus (Temminck & Schlegel); 2) Caligus lagocephali Pillai, 1961 (♀) from the gills of panther puffer Takifugu pardalis (Temminck & Schlegel); 3) Euryphorus brachypterus (Gerstaecker, 1853) (♀, ♂) from the opercular cavity of Atlantic bluefin tuna Thunnus thynnus (Linnaeus); 4) Euryphorus nordmanni Milne Edwards, 1840 (♀, ♂) from the opercular cavity of common dolphin fish Coryphaena hippurus Linnaeus; 5) Gloiopotes huttoni (Thomson) (♀, ♂) from the body surface of black marlin Istiompax indica (Cuvier); 6) Lepeophtheirus hapalogenyos Yamaguti & Yamasu, 1959 (♀) from the gill filaments of O. fasciatus; 7) Lepeophtheirus sekii Yamaguti, 1936 (♀, ♂) from the body surface of red seabream Pagrus major (Temminck & Schlegel); 8) Brachiella thynni Cuvier, 1830 (♀) from the body surface of longfin tuna or albacore Thunnus alalunga (Bonnaterre); 9) Lernanthropinus sphyraenae (Yamaguti & Yamasu, 1959) (♀) from the gill filaments of moon fish Mene maculata (Bloch & Schneider). Since the female was already reported in Korea, it is a new record for the male of C. hoplognathi. A checklist for the parasitic copepods of the family Caligidae, Lernaeopodidae and Lernanthropidae of Korea is provided. PMID:26691264

  7. Gaetice depressus (Crustacea, Varunidae): Species profile and its role in organic carbon and nitrogen flow

    Science.gov (United States)

    Wahyudi, A'an. J.; Wada, Shigeki; Aoki, Masakazu; Hama, Takeo

    2015-06-01

    Gaetice depressus is one of the most dominant macrozoobenthos species in boulder shores of intertidal coastal ecosystems in Japan. As recorded in previous studies, this species is also considered as having high density and biomass. Consequently, it is thought to be one of the more important species in the organic matter flow of boulder shores, especially through the food web. In this study, some taxonomic problems related to G. depressus were tackled and the autoecology and ecological processes in the intertidal ecosystem of G. depressus, such as organic matter flow, were investigated. Furthermore, in order to clarify the taxonomy description, resolve inconsistencies in the scientific name, and learn about the life history, a literature review was conducted. Seasonal changes in density, morphology pattern and population structure were determined based on the data obtained in Ebisu Island, Japan. Then, the role of G. depressus was determined by estimating the intake and emittance fluxes of organic carbon and nitrogen through ingestion and egestion process in the boulder shores of Ebisu Island. A feeding rate experiment was also conducted in order to estimate the intake flux by using the catch-release-recapture method. Meanwhile, to estimate the emittance flux, a defecation rate experiment was conducted by catching some individuals of G. depressus, and then incubating them in the laboratory. The feeding rate measured by the speed of diet consumption of G. depressus was about 12.6 mg ind-1 h-1. Considering the average density, the intake flux through the feeding process could be estimated as 25.2 mgC m-2 h-1 and 2.6 mgN m-2 h-1. On the other hand, G. depressus egested fecal pellet at the rate of 5.4 mg ind-1 h-1. The average emittance flux through the fecal pellet egesting process is estimated at 5.6 mgC m-2 h-1 and 0.7 mgN m-2 h-1. Therefore, it can be estimated that about 25% of organic matter from diet is egested as fecal pellet, which means that about 75% of the intake flux of organic carbon and nitrogen is used for the total assimilation of G. depressus. Intake flux was also considered as affecting the high dynamism of primary producer consumption. The total population of G. depressus is estimated to consume about 18.4% of primary producer in average throughout the year. Therefore, the turnover time of primary producer by consumption of G. depressus was about five days.

  8. Cypris morphology in the barnacles Ibla and Paralepas (Crustacea: Cirripedia Thoracica) implications for cirripede evolution

    DEFF Research Database (Denmark)

    Høeg, Jens T; Achituv, Yair; Chan, Benny K K; Chan, Karen; Jensen, Peter Gram; Pérez-Losada, Marcos

    2009-01-01

    there are no specific apomorphies with either the Acrothoracica, the Rhizocephala or any particular subgroup within the Thoracica. This is in agreement with recent molecular evidence that Ibla (Ibliformes) is the sister taxon to all other Thoracica and the ibliforms therefore become the outgroup of...

  9. A Study of the Morphology and Biology of Thompsonia littoralis (Crustacea: Cirripedia: Rhizocephala)

    DEFF Research Database (Denmark)

    Lützen, Jørgen; Jespersen, Åse

    1992-01-01

    Interna development within the intertidal tropical crab, Leptodius exaratus, requires up to 4.5 months; the roots become distributed from the CNS along the major nerves and, when the crab moults, results in emergence of numerous externae located symmetrically on the abdomen and bases of the thora...

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

    OpenAIRE

    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 cristae, frontal median triangle, and male first pleopod.

  11. Taxonomic Note on Nannastacus nyctagineus (Crustacea: Cumacea: Nannastacidae from Korean Waters

    Directory of Open Access Journals (Sweden)

    Chang-Mok Lee

    2016-01-01

    Full Text Available Korean nannastacids have recorded only eight species belonging to genera Campylaspis and Cumella. In this paper, Nannastacus nyctagineus Gam?, 1962, is redescribed and illustrated as a new species of Korean fauna in this study for the first time. Korean female specimens of Nannastacus nyctagineus correspond well with the original description by Gam?, 1962 based on only female specimens. Gam? has described that new species, Nannastacus pruinosus could be distinguished from N. nyctagineus based on only male specimens. The Korean male specimens of N. nyctagineus undoubtedly match well with the description of N. pruinosus with the following common features: the surface of the carapace is covered with numerous granules; pereonites and pleonites have similar patterns of the teeth on dorsal surface; the proportion and armature of the dactylus of pereopod 2 is similar; the number and pattern arrangement of the setae on the surface in antenna 1, pereopod 1, and uropod are the all most same. Nannastacus pruinosus Gam?, 1962 is proposed as a synonym of N. nyctagineus described in this study. This represents the first record on the genus Nannastacus from Korea.

  12. 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.

  13. New Report on Two Species of the Genus Nipponomysis (Crustacea: Mysida: Mysidae from Korean Waters

    Directory of Open Access Journals (Sweden)

    Kim, Mijin

    2015-01-01

    Full Text Available Two species of mysid, Nipponomysis fusca (Ii, 1936 and N. tenuiculus (Ii, 1940, are newly recorded in Korean fauna. These two species were collected using a light or a bait trap from all coasts of the Korean peninsula. The genus Nipponomysis can be distinguished from allied genus by the following morphological characteristics: third to eighth thoracic endopods with carpopropodus divided into five to six subsegments compared to three subsegments, and anterior four pairs of pleopod in female subequal in length and fifth pair elongated. Nipponomysis fusca is characterized by its acute rostral plate and armature of telson, and N. tenuiculus differs from other species by the number of spine in ventral statocyst region and the shape of the fourth pleopod in male. Herein, we present detailed descriptions of two species from Korean waters with illustrations of morphology. In addition, an identification key to the Korean species of the genus is provided.

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

    Directory of Open Access Journals (Sweden)

    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.

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

    Directory of Open Access Journals (Sweden)

    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.

  16. Experimental evaluation of Candonocypris novaezelandiae (Crustacea: Ostracoda in the biocontrol of Schistosomiasis mansoni transmission

    Directory of Open Access Journals (Sweden)

    Fouad Yousif

    2013-04-01

    Conclusions: The presence of this ostracod in the aquatic habitat led to significant reduction of snail population, infection rate of snails with schistosme miracidia as well as of cercarial production from the infected snails. This may suggest that introducing C. novaezelandiae into the habitat at schistosome risky sites could suppress the transmission of the disease.

  17. Seasonal variability of planktonic copepods (Copepoda: Crustacea in a tropical estuarine region in Brazil

    Directory of Open Access Journals (Sweden)

    Cristina de Oliveira Dias

    2009-12-01

    Full Text Available The Caravelas River estuary and adjacent coastal region were studied during the rainy and dry seasons of 2003-2004 to assess the copepod community structure. Abiotic and biotic parameters were measured, and the total density, frequency and percentage of copepod taxa were determined for each sampling period. Copepod densities showed significant differences between sampling periods, with higher densities in the rainy seasons (Mean: 90,941.80 ind.m-3; S.D.: 26,364.79. The sampling stations located to the north and south, in the coastal region adjacent to the Caravelas River estuary presented the lowest copepod density values. The copepod assemblage was composed mainly of estuarine and estuarine/coastal copepods. The seasonal variations in temperature and salinity influenced the abundance of species during the rainy and dry seasons, with the following dominant species alternating: Paracalanus quasimodo Bowman, 1971 in the rainy season of 2003, Parvocalanus crassirostris Dahl, 1894 in the dry season of 2003 and Acartia lilljeborgii Giesbrecht, 1892 in the rainy and dry seasons of 2004. Non-parametric multidimensional scaling indicated differences in copepod assemblages between sampling periods, but not between sampling stations.

  18. Toxicity of Five Phenolic Compounds to Brine Shrimp Artemia sinica(Crustacea:Artemiidae)

    Institute of Scientific and Technical Information of China (English)

    Ali Shaukat; LIU Guangxing; LI Zhengyan; XU Donghui; HUANG Yousong; CHEN Hongju

    2014-01-01

    The acute toxicity of five phenolic compounds each to 15 d old Artemia sinica was determined in this study. The brine shrimp A. sinica was hatched from the encysted dry eggs (Bohai Bay Brand) produced by Dongying Ocean Artemia Co., Ltd., China at 27℃± 1℃in pre-filtered (through pores of 0.45 µm in diameter) and autoclaved seawater (salinity 31, pH 7.5-8.0) in a cilindroconical glass beaker (2000 mL in volume) under continuous illumination (provided by a side set 20 W fluorescent lamp) with slight aeration. Ten Artemia individuals from the same batch of the hatched were cultured in 10 mL toxicant solution prepared with seawater (salinity 31, pH 7.5-8.0) at room temperature (about 20℃) to determine 24 h, 48 h and 72 h medium lethal concentration (LC50) of 5 phenolic compounds each. It was found that the toxicity of n-heptylphenol was the highest followed by nonylphenol, t-butylphenol, 2,4-dichlorophenol and bisphenol A in order. The LC50 values of the 5 compounds were calculated with regression analysis. The real concentration (in µg L-1) of 5 phenolic compounds each in toxicant solutions was measured with GC/MS analysis. Significant loss of phenolic compounds caused by either adsorption or desorption was not found. The significant difference of LC50 values was found among the five compounds 3 exposure times each. The range between the highest no-observed-effect concentration (NOEC) and 100%death causing concentration of five phenolic compounds each was determined. The toxicity in term of 24 h LC50 value of n-HP was 9.10 times higher than that of BPA, 1.71 times higher than t-BP, 1.53 times higher than 2,4-DCP and 1.36 times higher than NP, respectively.

  19. Development and characterization of eight polymorphic microsatellite markers for Daphnia atkinsoni (Crustacea: Ctenodaphnia).

    Science.gov (United States)

    Ortells, R; VAN Houdt, J K J; Geldof, S; DE Meester, L; Mergeay, J

    2009-01-01

    A microsatellite-enriched genomic library was developed for the water flea Daphnia atkinsoni Baird, 1859, a dominant species of intermittent wetlands in Europe. Eight polymorphic microsatellite markers were successfully optimized. Characterization of 77 individuals from Belgium and Spain showed moderate (in the former) to high (in the latter) levels of polymorphism with two to 11 alleles per locus and an observed heterozygosity ranging from 0 to 0.87. Some of these microsatellite markers were successfully amplified in three other Daphnia species (D. magna n = 4, D. similis n = 6; D. obtusa n = 6). PMID:21564640

  20. Calanoida (Crustacea Copepoda from the inland waters of Apulia (south-eastern Italy

    Directory of Open Access Journals (Sweden)

    Giuseppe ALFONSO

    2011-02-01

    Full Text Available The currently available knowledge on biodiversity and species distribution of Italian fauna still presents some gaps to be filled, in particular in the southern part of the country. This study represents the first survey aimed at assessing the presence and distribution of Calanoida in inland waters of Apulia (south-eastern Italy. The research lasted five years and led to the mapping of 121 inland water bodies, most of which are characterized by temporary hydroperiods. Fifty-five of the sampled sites hosted at least one calanoid species, and 48 sites (among the 55 sites hosting Calanoida are temporary water bodies. Thirteen calanoid species were detected in total; several of these are first records for Apulia and three species are new records for mainland Italy. The efficiency of the sampling effort was tested for both the entire Apulian territory and its main subareas, namely Gargano (in northern Apulia, and Salento (southern Apulia. Central Apulia showed the lowest species richness among the three sampled subareas. This is probably due to the scarcity of inland water bodies. Species composition of Apulian calanoid fauna was compared to the ones of the geographically close areas for which data are available: the other Italian faunal provinces (Alpine, Apennine, Padanian, Sardinian and Sicilian provinces and the Balkans (Albania, Corfu, Croatia, Greece and Turkish Trace, Macedonia, Slovenia. Gargano and Salento showed a different assemblage of vicariant species but both the areas showed a remarkable presence of Mediterranean elements that, in fact, characterize the whole Apulian faunal province. The highest similarities for inland water calanoid fauna, which were observed between Gargano and the Apennine province, and between Salento and Sicily, are discussed, along with the total assessment of the whole Apulian calanoid fauna.

  1. Experimental evaluation of Candonocypris novaezelandiae (Crustacea: Ostracoda) in the biocontrol of Schistosomiasis mansoni transmission

    Science.gov (United States)

    Yousif, Fouad; Hafez, Sherif; El Bardicy, Samia; Tadros, Menerva; Taleb, Hoda Abu

    2013-01-01

    Objective To test Candonocypris novaezelandiae (Baird) (C. novaezelandiae), sub-class Ostracoda, obtained from the Nile, Egypt for its predatory activity on snail, Biomphalaria alexandrina (B. alexandrina), intermediate host of Schistosoma mansoni (S. mansoni) and on the free-living larval stages of this parasite (miracidia and cercariae). Methods The predatory activity of C. novaezelandiae was determined on B. alexandrina snail (several densities of eggs, newly hatched and juveniles). This activity was also determined on S. mansoni miracidia and cercariae using different volumes of water and different numbers of larvae. C. novaezelandiae was also tested for its effect on infection of snails and on the cercarial production. Results C. novaezelandiae was found to feed on the eggs, newly hatched and juvenile snails, but with significant reduction in the consumption in the presence of other diet like the blue green algae (Nostoc muscorum). This ostracod also showed considerable predatory activity on the free-living larval stages of S. mansoni which was affected by certain environmental factors such as volume of water, density of C. novaezelandiae and number of larvae of the parasite. Conclusions The presence of this ostracod in the aquatic habitat led to significant reduction of snail population, infection rate of snails with schistosme miracidia as well as of cercarial production from the infected snails. This may suggest that introducing C. novaezelandiae into the habitat at schistosome risky sites could suppress the transmission of the disease. PMID:23620849

  2. 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

  3. Formation of the hindgut cuticular lining during embryonic development of Porcellio scaber (Crustacea, Isopoda

    Directory of Open Access Journals (Sweden)

    Polona Mrak

    2015-07-01

    Full Text Available The hindgut and foregut in terrestrial isopod crustaceans are ectodermal parts of the digestive system and are lined by cuticle, an apical extracellular matrix secreted by epithelial cells. Morphogenesis of the digestive system was reported in previous studies, but differentiation of the gut cuticle was not followed in detail. This study is focused on ultrastructural analyses of hindgut apical matrices and cuticle in selected intramarsupial developmental stages of the terrestrial isopod Porcellio scaber in comparison to adult animals to obtain data on the hindgut cuticular lining differentiation. Our results show that in late embryos of stages 16 and 18 the apical matrix in the hindgut consists of loose material overlaid by a thin intensely ruffled electron dense lamina facing the lumen. The ultrastructural resemblance to the embryonic epidermal matrices described in several arthropods suggests a common principle in chitinous matrix differentiation. The hindgut matrix in the prehatching embryo of stage 19 shows characteristics of the hindgut cuticle, specifically alignment to the apical epithelial surface and a prominent electron dense layer of epicuticle. In the preceding embryonic stage – stage 18 – an electron dense lamina, closely apposed to the apical cell membrane, is evident and is considered as the first epicuticle formation. In marsupial mancae the advanced features of the hindgut cuticle and epithelium are evident: a more prominent epicuticular layer, formation of cuticular spines and an extensive apical labyrinth. In comparison to the hindgut cuticle of adults, the hindgut cuticle of marsupial manca and in particular the electron dense epicuticular layer are much thinner and the difference between cuticle architecture in the anterior chamber and in the papillate region is not yet distinguishable. Differences from the hindgut cuticle in adults imply not fully developed structure and function of the hindgut cuticle in marsupial manca, possibly related also to different environments, as mancae develop in marsupial fluid. Bacteria, evenly distributed within the homogenous electron dense material in the hindgut lumen, were observed only in one specimen of early marsupial manca. The morphological features of gut cuticle renewal are evident in the late marsupial mancae, and are similar to those observed in the exoskeleton.

  4. Comparative Ultrastructure and Carbohydrate Composition of Gastroliths from Astacidae, Cambaridae and Parastacidae Freshwater Crayfish (Crustacea, Decapoda

    Directory of Open Access Journals (Sweden)

    Gérard Alcaraz

    2012-12-01

    Full Text Available Crustaceans have to cyclically replace their rigid exoskeleton in order to grow. Most of them harden this skeleton by a calcification process. Some decapods (land crabs, lobsters and crayfish elaborate calcium storage structures as a reservoir of calcium ions in their stomach wall, as so-called gastroliths. For a better understanding of the cyclic elaboration of these calcium deposits, we studied the ultrastructure of gastroliths from freshwater crayfish by using a combination of microscopic and physical techniques. Because sugars are also molecules putatively involved in the elaboration process of these biomineralizations, we also determined their carbohydrate composition. This study was performed in a comparative perspective on crayfish species belonging to the infra-order Astacidea (Decapoda, Malacostraca: three species from the Astacoidea superfamily and one species from the Parastacoidea superfamily. We observed that all the gastroliths exhibit a similar dense network of protein-chitin fibers, from macro- to nanoscale, within which calcium is precipitated as amorphous calcium carbonate. Nevertheless, they are not very similar at the molecular level, notably as regards their carbohydrate composition. Besides glucosamine, the basic carbohydrate component of chitin, we evidenced the presence of other sugars, some of which are species-specific like rhamnose and galacturonic acid whereas xylose and mannose could be linked to proteoglycan components.

  5. New deep-sea Paratanaoidea (Crustacea: Peracarida: Tanaidacea) from the northeastern Gulf of Mexico.

    Science.gov (United States)

    Drumm, David T; Bird, Graham J

    2016-01-01

    One new genus is erected and four new species of paratanaoidean tanaidaceans are described from deep waters in the northeastern Gulf of Mexico: one in each of the genera Collettea, Tanaella, and Pseudomacrinella, and one as a new genus in the family Anarthruridae. Keys to species in the genera Collettea, Tanaella, and the genera of the Anarthruridae are provided. PMID:27615848

  6. The terrestrial Isopoda (Crustacea, Oniscidea of Rapa Nui (Easter Island, with descriptions of two new species

    Directory of Open Access Journals (Sweden)

    Stefano Taiti

    2015-07-01

    Full Text Available Nine species of terrestrial isopods are reported for the Polynesian island of Rapa Nui (Easter Island based upon museum materials and recent collections from field sampling. Most of these animals are non-native species, but two are new to science: Styloniscus manuvaka sp. n. and Hawaiioscia rapui sp. n. Of these, the former is believed to be a Polynesian endemic as it has been recorded from Rapa Iti, Austral Islands, while the latter is identified as a Rapa Nui island endemic. Both of these new species are considered ‘disturbance relicts’ and appear restricted to the cave environment on Rapa Nui. A short key to all the oniscidean species presently recorded from Rapa Nui is provided. We also offered conservation and management recommendations for the two new isopod species.

  7. The terrestrial Isopoda (Crustacea, Oniscidea) of Rapa Nui (Easter Island), with descriptions of two new species.

    Science.gov (United States)

    Taiti, Stefano; Wynne, J Judson

    2015-01-01

    Nine species of terrestrial isopods are reported for the Polynesian island of Rapa Nui (Easter Island) based upon museum materials and recent collections from field sampling. Most of these animals are non-native species, but two are new to science: Styloniscusmanuvaka sp. n. and Hawaiiosciarapui sp. n. Of these, the former is believed to be a Polynesian endemic as it has been recorded from Rapa Iti, Austral Islands, while the latter is identified as a Rapa Nui island endemic. Both of these new species are considered 'disturbance relicts' and appear restricted to the cave environment on Rapa Nui. A short key to all the oniscidean species presently recorded from Rapa Nui is provided. We also offered conservation and management recommendations for the two new isopod species. PMID:26261438

  8. COMPARISON OF STRESS PROTEINS PARTICIPATION IN ADAPTATION MECHANISMS OF BAIKALIAN AND PALEARCTIC AMPHIPOD (AMPHIPODA; CRUSTACEA) SPECIES

    OpenAIRE

    Timofeyev M.A; Shatilina Zh.M.; Bedulina D.S.; Protopopova M.V.; Grabelnych O.I.; Pobezhimova T.P.; Kolesnichenko A.V.

    2006-01-01

    The aim of the present study was a study of the influence different stressful factor on syntheses and activity of the stress proteins (HSP70, sHSP and peroxidase) of freshwater organism. Six freshwater amphipod species were investigated: Eulimnogammarus cyaneus (Dyb.), E verrucosus (Gerstf.), E vittatus (Dyb.) - endemic species from Lake Baikal which were compared with Palearctic species - Gammarus lacustris Sars., G tigrinus (Sexton), Chaetogammarus ischnus (Stebbins). It was shown expressio...

  9. Argulus vittatus (Rafinesque-Smaltz, 1814) (Crustacea: Branchiura) parasitic on Algerian fishes.

    Science.gov (United States)

    Ramdane, Zouhir; Trilles, Jean-Paul

    2012-04-01

    Eighteen female specimens of Argulus vittatus (Rafinesque-Smaltz, 1814) were recently collected from the Algerian coast. As until now this species was poorly described, this contribution redescribes this species with more precise drawings on the general morphology and appendages, using this fresh material. For the first time, two new hosts are identified. Host specificity and some ecological data are also reported. PMID:21987102

  10. INDUCTION OF ANAEROBIC PROCESSES IN BAIKAL ENDEMICS EULIMNOGAMMARUS VITTATUS (DYB. AND E. VERRUCOSUS (DYB. (AMPHIPODA, CRUSTACEA

    Directory of Open Access Journals (Sweden)

    Timofeyev M.A.

    2006-03-01

    Full Text Available The data confirming the ability of Baikalian endemic species Eulimnogammarus vittatus (Dyb. and E. verrucosus (Dyb. to activate anaerobic glycolysis under hypoxia are presented. The differences in the degree and the rate of lactic acid accumulation and remetabolisation in returning to aerobiosis are noted in the species concerned. On the example of E. vittatus the ability of Baikalian endemics to activate anaerobic lipolysis and process of anaerobic formation of succinate is shown

  11. INDUCTION OF ANAEROBIC PROCESSES IN BAIKAL ENDEMICS EULIMNOGAMMARUS VITTATUS (DYB.) AND E. VERRUCOSUS (DYB.) (AMPHIPODA, CRUSTACEA)

    OpenAIRE

    Timofeyev M.A; Kirichenko K.A.; Rokhin A.V.; Bedulina D.S.; Chernyshova K.P.; Pobezhimova T.P.

    2006-01-01

    The data confirming the ability of Baikalian endemic species Eulimnogammarus vittatus (Dyb.) and E. verrucosus (Dyb.) to activate anaerobic glycolysis under hypoxia are presented. The differences in the degree and the rate of lactic acid accumulation and remetabolisation in returning to aerobiosis are noted in the species concerned. On the example of E. vittatus the ability of Baikalian endemics to activate anaerobic lipolysis and process of anaerobic formation of succinate is shown

  12. COMPARISON OF STRESS PROTEINS PARTICIPATION IN ADAPTATION MECHANISMS OF BAIKALIAN AND PALEARCTIC AMPHIPOD (AMPHIPODA; CRUSTACEA SPECIES

    Directory of Open Access Journals (Sweden)

    Timofeyev M.A

    2006-03-01

    Full Text Available The aim of the present study was a study of the influence different stressful factor on syntheses and activity of the stress proteins (HSP70, sHSP and peroxidase of freshwater organism. Six freshwater amphipod species were investigated: Eulimnogammarus cyaneus (Dyb., E verrucosus (Gerstf., E vittatus (Dyb. - endemic species from Lake Baikal which were compared with Palearctic species - Gammarus lacustris Sars., G tigrinus (Sexton, Chaetogammarus ischnus (Stebbins. It was shown expression of sHSP by heat and toxic stresses for all amphipods species. Oxidative stress induced HSP70 for Palearctic species G tigrinus and C ischnus but not for baikalian species. Heat stress did not caused the increase of HSP70 level for Baikalian species of amphipods. The activity of the peroxidase was decrease by heat and toxic stresses. Oxidative stress caused the increase of peroxidase activity for Palearctic species, and the decrease for Baikalian once.

  13. 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.

  14. The new species of Mysidacea (Crustacea), Anchialina labatus and Gastrosaccus sarae, from south west Australia

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    Descriptions of two new sepcies Anchialina labatus and Gastrosaccus sarae, are give. A. lobatus is distinguished from the other species of the genus by the presence of a hairy lobe on the first segment of the antennule, by the modified setae...

  15. Seasonal variability of metabolic markers and oxidative balance in freshwater amphipod Hyalella kaingang (Crustacea, Amphipoda).

    Science.gov (United States)

    Braghirolli, Fernando Machado; Oliveira, Maiara Rodriguez; Oliveira, Guendalina Turcato

    2016-08-01

    Amphipods are widely used as bioindicator organisms, in view of their ease of collection and cultivation, sexual dimorphism and abundance, in aquatic environments. In the present study male (n=30) and female (n=30) amphipod Hyalella kaingang were collected during the middle of each season from a nature preserve (Research Center PRÓ-MATA) in São Francisco de Paula, Southern Brazil. Proteins, glycogen, lipids, triglycerides, glycerol, and lipid peroxidation (superoxide dismutase, catalase, and glutathione S-transferase activity) were measured. The results obtained for the markers of energy metabolism, antioxidant enzymes, and lipid peroxidation revealed a clear seasonal variation. The patterns of proteins, glycerol, and glutathione S-transferase activity did not differ between sexes; conversely, differential responses in males and females over the year were observed for all other parameters (glycogen, lipids, triglycerides, lipid peroxidation, and superoxide dismutase and catalase activity). These responses appear to be strongly influenced by a prolonged reproductive period (autumn through spring, peaking in autumn); by the degree of exploratory activity, particularly in the summer and autumn; and by abiotic factors, such as temperature and photoperiod. The responses observed in the summer and autumn (decrease in levels of proteins, glycogen and fats, and increase in lipid peroxidation levels and glutathione S-transferase activity), suggest that this season represents a critical time point for these animals. The parameters studied herein may be used as biomarkers to assess the environmental conditions in the aquatic habitat. PMID:27107775

  16. Growth curve of Atlantoscia floridana (van Name (Crustacea, Isopoda, Philosciidae from a Brazilian Restinga Forest

    Directory of Open Access Journals (Sweden)

    Paula Beatriz Araujo

    2004-03-01

    Full Text Available The terrestrial isopod Atlantoscia floridana (van Name, 1940 occurs from the U.S.A. (Florida to Brazil and Argentina. In the southernmost Brazilian State, Rio Grande do Sul, the species is recorded in many localities, in urban and in non-urban areas. The growth curve of Atlantoscia floridana based on field data is presented. The specimens were sampled from April, 2000 to October, 2001 at the Reserva Biológica do Lami (RBL, Rio Grande do Sul. Captured individuals were sexed and had their cephalothorax width measured, with the data analyzed with von Bertalanffy's model. The growth curves for males and females are described, respectively, by the equations: Wt = 1.303 [1 - e-0.00941 (t + 50.37] and Wt = 1.682 [1 - e-0.00575 (t + 59.13]. The curves showed differential growth between sexes, where females reach a higher Wµ with a slower growth rate. Based on the growth curves it was also possible to estimate life expectancy for males and females.O isópodo terrestre Atlantoscia floridana (van Name, 1940 ocorre desde os Estados Unidos (Flórida até o Brasil e Argentina. No Rio Grande do Sul a espécie é registrada em muitas localidades, em áreas urbanas e não-urbanas. Este trabalho apresenta a curva de crescimento de Atlantoscia floridana, baseada em dados de campo. Os espécimes foram amostrados desde abril, 2000 a outubro, 2001 na Reserva Biológica do Lami (RBL, Rio Grande do Sul. Os indivíduos capturados foram sexados e tiveram o cefalotórax medido. Os dados foram analisados utilizando-se o modelo de von Bertalanffy. A curva de crescimento para machos e fêmeas são descritas, respectivamente, pelas equações Wt = 1.303 [1 - e-0.00941 (t + 50.37] e Wt = 1.682 [1 - e -0.00575 (t + 59.13]. As curvas mostraram crescimento diferencial entre os sexos, onde as fêmeas atingem o maior Wµ com uma taxa de crescimento menor. Com base nas curvas de crescimento também foi possível estimar a expectativa de vida para machos e fêmeas.

  17. Growth curve of Atlantoscia floridana (van Name) (Crustacea, Isopoda, Philosciidae) from a Brazilian Restinga Forest

    OpenAIRE

    Paula Beatriz de Araujo; Georgina Bond-Buckup

    2004-01-01

    The terrestrial isopod Atlantoscia floridana (van Name, 1940) occurs from the U.S.A. (Florida) to Brazil and Argentina. In the southernmost Brazilian State, Rio Grande do Sul, the species is recorded in many localities, in urban and in non-urban areas. The growth curve of Atlantoscia floridana based on field data is presented. The specimens were sampled from April, 2000 to October, 2001 at the Reserva Biológica do Lami (RBL), Rio Grande do Sul. Captured individuals were sexed and had their ce...

  18. Identifying cryptic speciation across groundwater populations: first COI sequences of Bathynellidae (Crustacea, Syncarida

    Directory of Open Access Journals (Sweden)

    Camacho, A. I.

    2011-06-01

    Full Text Available The biodiversity of groundwater fauna remains poorly known and understood. Groundwater biodiversity studies are strongly affected by habitat inaccessibility and taxonomic crisis. The objective of this work was to investigate levels of genetic divergence across populations of Bathynellacea, a small crustacean group that lives exclusively in groundwater, in order to evaluate the extent of cryptic speciation in morphologically constrained clades. Partial sequences of cytochrome oxidase I (COI have been obtained, for the first time in Bathynellidae. Specimens analyzed of the genus Vejdovskybathynella were obtained from six populations morphologically assignable to a single species; all of them are located in different areas of one of the largest karst systems (110 km of galleries topographied known in Spain. The analyses of molecular data demonstrate the presence of three highly divergent genetic units, possibly corresponding to undescribed new species. The results of this study provide the first molecular data that complement morphological knowledge in order to address phylogenetic studies to try to resolve the relations between genera and species of the Bathynellidae family. We conclude that the evolutionary scenario of this special group of subterranean crustaceans cannot be revealed only by using morphological information due to the presence of very old lineages of cryptic species, as has been brought to light with the molecular data obtained here.

    La biodiversidad de la fauna de las aguas subterráneas sigue siendo poco conocida. Los estudios de diversidad biológica de las aguas subterráneas se ven negativamente afectados por la inaccesibilidad del hábitat y la crisis taxonómica. El objetivo de este trabajo es estudiar los niveles de divergencia genética de poblaciones de Bathynellacea, un pequeño grupo de crustáceos que viven exclusivamente en las aguas subterráneas, para evaluar la extensión de la especiación críptica en clados morfológicamente constreñidos. Las secuencias parciales de citocromo oxidasa I (COI se han obtenido, por primera vez, de varios ejemplares de la familia Bathynellidae. Los ejemplares analizados del género Vejdovskybathynella proceden de seis poblaciones, morfológicamente asignables a una única especie, de uno de los sistemas kársticos más grandes de España (110 km de galerías topografiadas. El análisis de datos moleculares demuestra la presencia de tres unidades con elevada divergencia genética, dos de ellas posiblemente correspondientes a nuevas especies sin describir. Los resultados de este estudio proporcionan los primeros datos moleculares que permiten complementar el conocimiento morfológico para abordar estudios filogenéticos que ayuden a resolver las relaciones de parentesco de las especies de diferentes géneros de la familia Bathynellidae. Podemos concluir que el escenario evolutivo de este grupo de crustáceos subterráneos no se puede revelar sólo con información morfológica debido a la presencia de linajes muy antiguos de especies crípticas que parecen salir a la luz sólo con datos moleculares como los obtenidos en este trabajo.

  19. A new spelaeogriphacean (Crustacea: Peracarida) from the Upper Jurassic of China

    NARCIS (Netherlands)

    Yan-bin, Shen; Taylor, Rod S.; Schram, Frederick R.

    1998-01-01

    A new monotypic genus of Spelaeogriphacea is described from the Upper Jurassic of Liaoning Province, north-east China. This new genus and species brings the number of known spelaeogriphacean taxa to four, the others being two recent forms from Brazil and South Africa, and one from the Carboniferous

  20. A new species of Hyalella from the Andes in Perú (Crustacea: Amphipoda: Hyalellidae)

    OpenAIRE

    Exequiel R. González; Les Watling

    2002-01-01

    Hyalella pauperocavae n. sp. from Huancayo, Perú, is described. Five other epigean freshwater amphipods have been described from Peru (excluding Lake Titicaca), but the lack of type material and poor descriptions do not allow the assignment of the species described here to any of the names known for the areaSe describe la especie Hyalella pauperocavae n. sp. recolectada en la localidad de Huancayo, Perú. Otras cinco especies de anfípodos epígeos se conocen para el Perú (excluyendo aquellas pr...

  1. Redescription of the freshwater amphipod Hyalella faxoni from Costa Rica (Crustacea: Amphipoda: Hyalellidae

    Directory of Open Access Journals (Sweden)

    Exequiel R. González

    2002-06-01

    Full Text Available Hyalella faxoni Stebbing, 1903 from Costa Rica is redescribed. The species was previously in the synonymy of Hyalella azteca (Saussure, 1858. The morphological differences between these two species are discussedLa especie Hyalella faxoni Stebbing, 1903 de Costa Rica es redescrita. Esta especie estaba previamente en la sinonimia de Hyalella azteca (Saussure, 1858. Se discuten en este trabajo las diferencias morfológicas entre las dos especies

  2. Redescription of the freshwater amphipod Hyalella faxoni from Costa Rica (Crustacea: Amphipoda: Hyalellidae)

    OpenAIRE

    Exequiel R. González; Les Watling

    2002-01-01

    Hyalella faxoni Stebbing, 1903 from Costa Rica is redescribed. The species was previously in the synonymy of Hyalella azteca (Saussure, 1858). The morphological differences between these two species are discussedLa especie Hyalella faxoni Stebbing, 1903 de Costa Rica es redescrita. Esta especie estaba previamente en la sinonimia de Hyalella azteca (Saussure, 1858). Se discuten en este trabajo las diferencias morfológicas entre las dos especies

  3. A new species of Hyalella from the Andes in Perú (Crustacea: Amphipoda: Hyalellidae

    Directory of Open Access Journals (Sweden)

    Exequiel R González

    2002-06-01

    Full Text Available Hyalella pauperocavae n. sp. from Huancayo, Perú, is described. Five other epigean freshwater amphipods have been described from Peru (excluding Lake Titicaca, but the lack of type material and poor descriptions do not allow the assignment of the species described here to any of the names known for the areaSe describe la especie Hyalella pauperocavae n. sp. recolectada en la localidad de Huancayo, Perú. Otras cinco especies de anfípodos epígeos se conocen para el Perú (excluyendo aquellas presentes en el Lago Titicaca. La ausencia de material tipo y descripciones poco claras impidieron la asignación de la especie descrita aquí a alguno de los nombres conocidos para el área

  4. First record of the Asian diaptomid Neodiaptomus schmackeri (Poppe & Richard, 1892 (Crustacea: Copepoda: Calanoida in Europe

    Directory of Open Access Journals (Sweden)

    Giuseppe Alfonso

    2014-06-01

    Full Text Available Albania, as well as a great part of the Balkan area in general, still suffers a lack of environmental studies especially in limnological research. The Dumre plateau, in Central Albania, is characterized by an extraordinary high number of karst lakes in a small geographic area. Despite their environmental peculiarity, very few biological data are to date available for these lakes, none on the zooplankton. For this reason, 15 water bodies located in the central area of the plateau were selected for a preliminary limnological survey carried out in the years 2008-2011. Neodiaptomus schmackeri (Poppe & Richard, 1892, a diaptomid calanoid copepod characterized by a South-Eastern Palearctic - Oriental distribution, and the most widely spread Neodiaptomus species in Asia, was found in 8 lakes of the Dumre area. This finding represents the first record of the species, and of the entire genus Neodiaptomus, for Europe. Several environmental variables were measured to characterize the lakes, and the co-occurring planktonic crustaceans were also identified. Taxonomical drawings and descriptions of the main morphological features of both sexes are herein provided in order to compare the Albanian populations of N. schmackeri with those of the native distribution area of the species. The possible causes which determined the occurrence of this non-indigenous species in several Dumre lakes are discussed.

  5. 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.

  6. Reproductive pattern of the epifaunal amphipod Pontogeneia rostrata (Crustacea) on dolsando sandy shore in Korea

    Science.gov (United States)

    Yu, Ok Hwan; Jeong, Seung Jin; Suh, Hae-Lip

    2008-09-01

    Reproductive patterns of an epifaunal amphipod, Pontogeneia rostrata, were studied on Dolsando sandy shore in Korea. The life history pattern was iteroparous, with recruitment mainly occurring from winter to spring. The sex ratio was male-biased, especially during breeding periods. The mean body length of females was significantly larger than that of males. Brood size and egg volume were positively related to the body length of ovigerous females. There was no significant difference in brood size between successive breeding periods, but egg volumes were significantly higher in early winter (December) than in late spring breeding (May and June), increasing the probability of survival to hatching. These traits contribute to more reproductive potential in early winter than in late spring breeding. The mean brood size of epifaunal P. rostrata was larger but the mean egg volume smaller than that of infaunal amphipods in this sampling area. We suggest that reproductive effort for epifaunal species may be proportionally greater than for infaunal species in risky environments.

  7. Ecophysiology of the cave isopod .i.Mesoniscus graniger./i. (Frivaldszky, 1865) (Crustacea: Isopoda)

    Czech Academy of Sciences Publication Activity Database

    Šustr, Vladimír; Elhottová, Dana; Krištůfek, Václav; Lukešová, Alena; Nováková, Alena; Tajovský, Karel; Tříska, Jan

    2005-01-01

    Roč. 41, 3-4 (2005), s. 69-75. ISSN 1164-5563 R&D Projects: GA AV ČR(CZ) KSK6005114 Institutional research plan: CEZ:AV0Z6066911 Keywords : isopoda * distribution * temperature Subject RIV: EH - Ecology, Behaviour Impact factor: 0.935, year: 2005

  8. "Vargamäe kuningriik". "Oscar ja Roosamamma. Kirjad Jumalale" / Tauno Teder

    Index Scriptorium Estoniae

    Teder, Tauno

    2007-01-01

    Autor soovitab vaadata Endla ja Rakvere Teatri suvelavastust "Vargamäe kuningriik" A. H. Tammsaare "Tõe ja õiguse" I ja V osa ainetel, lavastajaks Jaanus Rohumaa ning E.-E. Schmitti loo järgi sündinud näidendit "Oscar ja Roosamamma. Kirjad Jumalale". Lavastaja ja peaosas Üllar Saaremäe, Rakvere Teater

  9. Lõputa meediakunst Berliinis / Piibe Piirma

    Index Scriptorium Estoniae

    Piirma, Piibe

    2007-01-01

    Meediakunsti festival "Transmediale" alapealkirjaga "Unfinished" Berliini kunstiakadeemias ja linnaruumis 31. I-4. II. Konverentsidest, võidutöödest (Herman Asselberghsi "Proof of Life", Antoine Schmitti "Still Living", Tim Shore'i "Cabinet"), Stelarci etendusest "Fractal Flesh", David Rokeby, Herwig Turki ja Günter Stögeri töödest

  10. Ahmeti asemel astub lavale Üllar Saaremäe

    Index Scriptorium Estoniae

    2006-01-01

    10. nov. Rakvere Teatris Dajan Ahmetiga peaosas esietenduma pidanud E.-E. Schmitti näidendis "Oscar ja Roosamamma. Kirjad Jumalale" asub Ahmeti asemel Oscarit mängima tüki lavastaja Üllar Saaremäe

  11. Experimental infection in Notodiaptomus sp. (Crustacea: Calanoida with larvae of Camallanus sp. (Nematoda: Camallanidae Infecção experimental em Notodiaptomus sp. (Crustacea: Calanoida com larvas de Camallanus sp. (Nematoda: Camallanidae

    Directory of Open Access Journals (Sweden)

    M.L. Martins

    2007-04-01

    Full Text Available This trial registered the experimental infection viability with nematode larvae Camallanus sp. in Notodiaptomus sp., a crustacean, which can be an intermediate host. Adult females of nematode were dissected from the intestines of Xiphophorus maculatus (Osteichthyes: Poeciliidae, at a fish farm in the State of São Paulo. Females were slightly compressed for larvae release, collected with Pasteur pipette and separated on Petri dishes with 9ml filtered water at 28.1ºC, from zooplankton culture. Treatments consisted of Petri dishes with 60 and 105 copepods, in which 120, 150 and 210 larvae of nematode were added in four replications. Twenty-four and 36h after exposition to the larvae, the copepods were fixed in 70% alcohol to record the amount of fixed larvae. Twenty four hours after exposition, 60 copepods group with 120 larvae showed significantly higher prevalence (46.5% when compared to 105 copepods and 120 larvae (33.2%. Thus, these answers suggested that 120 larvae were enough for a successful infectivity. Experimental infection was available and so, it was used as a pattern to life cycle studies of camallanid nematodes and hosts susceptibility tests.A viabilidade da infecção experimental com larvas do nematóide Camallanus sp. em Notodiaptomus sp., crustáceo com potencial para hospedeiro intermediário foi avaliada. Fêmeas adultas do nematóide foram extraídas de Xiphophorus maculatus (Osteichthyes: Poeciliidae, provenientes de piscicultura de peixes ornamentais no estado de São Paulo. As fêmeas foram ligeiramente pressionadas para liberar as larvas, coletadas com pipeta Pasteur e separadas em placas de Petri contendo 9ml de água filtrada a 28,1ºC do próprio cultivo de zooplâncton. Os tratamentos consistiram de placas contendo 60 e 105 copépodes onde se adicionou 120, 150 e 210 larvas de nematóides em quatro repetições. Nos tempos de 24 e 36h após a exposição às larvas, os copépodes foram fixados em álcool 70% para quantificação de larvas. Após 24h de exposição, o grupo com 60 copépodes na presença de 120 larvas apresentou maior prevalência (46,5% do que 105 copépodes com 120 larvas (33,2%. Sugere-se que 120 larvas foram suficientes para o sucesso da infecção. A infecção experimental mostrou-se viável, servindo de modelo para o estudo do ciclo de vida de camalanídeos e testes de susceptibilidade de hospedeiros.

  12. Lista anotada de los isópodos acuáticos epicontinentales de México (Crustacea: Isopoda) Annotated list of the aquatic epicontinental isopods of Mexico (Crustacea: Isopoda)

    OpenAIRE

    Arturo Rocha-Ramírez; Fernando Álvarez; Javier Alcocer; Rafael Chávez-López; Elva Escobar-Briones

    2009-01-01

    El presente trabajo integra una lista de especies de crustáceos isópodos acuáticos continentales de México con referencias taxonómicas originales, sinonimias, localidades tipo y distribución. El listado comprende un total 6 familias que agrupan 49 especies, de las cuales sólo 10 son epigeas, mientras que las 39 restantes son hipogeas registradas en manantiales termales y cuevas de los sectores oriental y centro del país, así como en cenotes de los estados de Yucatán y Quintana Roo. Los grupos...

  13. Ecologia populacional dos Amphipoda (Crustacea dos fitais de Caiobá, Matinhos, Paraná, Brasil Population ecolocy of Amphipoda (Crustacea from the phytals of Caiobá, Matinhos, Paraná, Brazil

    Directory of Open Access Journals (Sweden)

    Janete Dubiaski-Silva

    1995-01-01

    Full Text Available Spalial and temporal density distributions of Amphipoda from the phytals of Caiobá are described. Air temperature oscillated from 16ºC (August and May to 23ºC (March, surface water temperature from 17ºC (August to 25ºC (March and the salinity from 29.3‰ (May to 32.8‰ (August. Two samples of 25cm² (for algae less than 5cm long, 100 cm² (for algae between 5-10cm long and whole plants (for algae more than 10cm long were removed with a spatula from the rocky surface at Caiobá Beach, in August/86, November/86, March/87 and May/87. After sorting, the algal substrata were weighted, their adsorption coefficient calculated and the sediment retained among the thallii weighted. The average distance between the branching was measured for all branched algae. The densities were calculated in relation to the weight of the algal substrate in grams. Eight phytals were considered: Ulva fasciata Delile, Padina gymnospora (Kútzing Vickers, Sargassum cymosum Garth, Porphyra atropurpurea (Olivi De Toni, Gelidium sp., Gymnogongrus griffithsiae (Turner Martius, Pterocladia capillacea (Gmelin Bornet &Thurel and Pterosiphonia pennata (Roth Falkenberg, over which nine Amphipoda species live: Ampithoe ramondi Audouin, 1816, Cymadusa filosa Savigny, 1852, Elasmopus pectenicrus Bate, 1857, Hyale media Dana, 1857, Hyale sp.l, Jassa falcata Montagu, 1895 and Sunampithoe pelagica H. Milne-Edwards, 1830 (Gammaridea. Caprella danilevskii Czerniavski, 1861 and Caprella penantis Leach, 1814 (Caprellidea. Amphipoda densities ranged from 0.27 ind.g-1 to 45.68. ind.g-1. The broad-thallii algae Porphyra, Ulva and Padina harbored lower densities of Amphipoda, whereas those finely branched Pterocladia, Pterosiphonia and Gymnogongrus, the highest values and the less branched Sargassum and Gelidium, intermediate values. The high densities found in the finely branched algae had as main contribution the juvenile recruiting of most Amphipoda. The tide level might have influenced the temporal distribution of the Amphipoda density, due to the distinct time of air exposition in eaeh collection data. Most Amphipoda did not show specific algal substratum colonization: only Sunampithoe pelagica occurred solely in Sargassum. Four species occurred in different branched algae: J. falcata. S. pelagica. C. danilevskii and C. penantis. H. media had Sargassum, Pterocladia, Pterosiphonia and Gymnogongrus as the best algal substrata, whereas Caprellidea, the Pterocladia and Pterosiphonia phytals. High sediment weight in Padina was the main reason for high densities of Hyale sp.l in this phytal. The occurrence of males, females (including ovigerous ones and juveniles of most Amphipoda species found in the present study indicates a complete life cycle whithin these phytals and corroborates with the assumption of the complexity of this marine coastal ecosystem.

  14. Lista anotada de los isópodos acuáticos epicontinentales de México (Crustacea: Isopoda Annotated list of the aquatic epicontinental isopods of Mexico (Crustacea: Isopoda

    Directory of Open Access Journals (Sweden)

    Arturo Rocha-Ramírez

    2009-12-01

    Full Text Available El presente trabajo integra una lista de especies de crustáceos isópodos acuáticos continentales de México con referencias taxonómicas originales, sinonimias, localidades tipo y distribución. El listado comprende un total 6 familias que agrupan 49 especies, de las cuales sólo 10 son epigeas, mientras que las 39 restantes son hipogeas registradas en manantiales termales y cuevas de los sectores oriental y centro del país, así como en cenotes de los estados de Yucatán y Quintana Roo. Los grupos más diversificados en México son cirolánidos y asélidos, que se encuentran tanto en aguas superficiales como en hábitats hipogeos. La región geográfica con mayor número de especies es el noreste, de Chihuahua a Tamaulipas, en tanto que carecen de registros toda la vertiente del Pacífico y algunos estados del centro y sur del país. Con base en los registros existentes se discute el patrón de distribución y se sugieren 4 áreas de concentración de especies en México. Se hace un análisis del estado de conservación de los isópodos acuáticos de México. Existe una notable asimetría entre la rareza y la vulnerabilidad de la mayoría de las especies y el grado de protección que se les asignó dentro de los instrumentos de conservación del gobierno mexicano.The present contribution integrates a species list of the aquatic isopods found in continental waters of Mexico with original taxonomic references, synonymies, type locality, and distributional data. The list comprises six families and 49 species, ten of which are epigean while the remaining 39 are hypogean, recorded from thermal springs and caves in the central and eastern portions of the country, and from cenotes in the states of Yucatan and Quintana Roo. The cirolanids and asellids are the most diversified groups in Mexico, in both surface and subterranean waters. While the most species rich area is the northeast, from Chihuahua to Tamaulipas, the entire Pacific slope along with some central and southern states lack records of aquatic isopods. Based on the existing records, the distribution pattern is discussed and the existence of four main areas of distribution is proposed. The conservation status of the aquatic isopods in Mexican continental waters is examined. A notable asymmetry is present between the rarity and vulnerability of most species and the level of protection was assigned for them by the Mexican government conservation agencies.

  15. Maturidade sexual do caranguejo Armases rubripes (Rathbun (Crustacea, Brachyura, Sesarmidae na Baía de Sepetiba, Rio de Janeiro, Brasil Sexual maturity of the crab Armases rubripes (Rathbun (Crustacea, Brachyura, Sesarmidae in Sepetiba Bay, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Giovana V. Lima

    2006-12-01

    Full Text Available Objetivou-se analisar a maturidade sexual de Armases rubripes (Rathbun, 1897 em três diferentes ambientes (rio, praia arenosa e manguezal no sudeste do Brasil. Os caranguejos foram coletados mensalmente de julho/2002 a fevereiro/2004, utilizando-se peneiras no Rio Sahy durante as marés altas e, manualmente, na praia e no manguezal, durante as marés baixas. Os animais foram capturados por dois coletores num esforço de 15 minutos por estação de coleta. No laboratório, os exemplares foram separados por sexo e mensurados em relação a largura da carapaça, do abdome e comprimento do gonopódio. As gônadas, gonopódios e o abdome foram analisados segundo sua forma e seu aspecto. Um total de 4.051 indivíduos foram amostrados (1.067 machos, 1.563 fêmeas e 1.421 juvenis. Foram determinados cinco morfotipos: juvenis, machos imaturos, fêmeas imaturas, machos maduros e fêmeas maduras. O início da maturidade sexual fisiológica e morfológica ocorreu de forma assíncrona, com machos produzindo gametas mais cedo que as fêmeas. O tamanho da primeira maturidade sexual apresentou diferença significativa entre os ambientes analisados, exceção observada para o manguezal. Os indivíduos obtidos no manguezal apresentaram menores tamanhos para o início da maturidade sexual. Embora, estimados os tamanhos da maturidade sexual morfológica de machos e fêmeas, a análise do crescimento alométrico foi inadequado para a espécie.The present study analyzed the sexual maturity of Armases rubripes (Rathbun, 1897 in three populations from different environmental conditions (river, beach and mangrove in the southeastern Brazilian coast. Crabs were sampled monthly from July 2002 to February 2004; they were captured with sieves at Sahy River, during the high tides, and by hand at beach and mangrove areas, during low tides. Animals were captured by establishing a catch effort of two collectors during 15 minutes for each station. At laboratory, all individuals were sexed and the carapace width measured. The gonads, gonopods and abdomen morphology were observed according to shape and macroscopic aspects. A total of 4,051 specimens were sampled (1,067males, 1,563 females and 1,421 juveniles. There were recognized five morphotypes: juveniles, immature males, immature females, mature males and mature females. The onset of physiological and morphological sexual maturity was asynchronous within sexes, of which, males reaching the ability to produce gametes earlier than females. The size at the onset of sexual maturity was significantly different among populations different coming from areas, except for mangrove area. The individuals obtained from mangrove showed the shortest size at the onset of sexual maturity. Therefore, estimates of males and females sizes at morphological sexual maturity the allometric growth analyses are inadequate in this species.

  16. Toxicidad del cobre en larvas nauplii del camarón comercial Artemesia longinaris Bate (Crustacea, Decapoda, Penaeidae) Copper toxicity in nauplii larvae of the commercial shrimp Artemesia longinaris (Crustacea, Decapoda, Penaeidae)

    OpenAIRE

    Marcelo A. Scelzo

    1997-01-01

    Se evaluó la toxicidad del cobre, empleando sulfato de cobre en larvas nauplii sin alimentar del camarón comercial Artemesia longinaris mediante bioensayos de 72 horas de duración, con el objeto de determinar la dosis efectiva media o concentración letal (LC50) y grado de desarrollo (estadio larval). Se prepararon concentraciones de cobre equivalentes a 1000, 500, 250 y 125 partes por billón (ppb) en agua de mar (salinidad de 34 %). Un total de 90 larvas nauplii por tratamiento (tres réplicas...

  17. Aspectos reproductivos del acocil Cambarellus (Cambarellus montezumae (Crustacea: Decápoda: Cambaridae en condiciones controladas Breeding aspects of the crayfish Cambarellus (Cambarellus montezumae (Crustacea: Decapoda: Cambaridae under controlled conditions

    Directory of Open Access Journals (Sweden)

    José Luis Arredondo-Figueroa

    2011-03-01

    Full Text Available El acocil Cambarellus (C. montezumae es una especie endémica cuya distribución está restringida a algunos cuerpos de agua lacustre. Se presentan los resultados sobre aspectos reproductivos de esta especie en condiciones controladas, con el objetivo de determinar la factibilidad de la producción de huevos y juveniles y su potencial aplicación a programas de rescate, repoblación y cultivo. Se realizaron 2 ensayos experimentales, el primero en 4 estanques exteriores de 800 litros conectados a sistemas cerrados de recirculación (SCR y el segundo en recipientes de plástico en laboratorio (RPL, de 2 litros. Para el primer ensayo, se manejaron 219 reproductores durante 335 días, obteniendo 136 hembras ovígeras. Cada hembra produjo en promedio 45 ± 23 huevos por puesta. El 83.7% de los huevos eclosionaron, obteniéndose un total de 3 162 juveniles. En los RPL se manejó una población F1 obtenida a partir de los reproductores del SCR en una relación 1 hembra: 2 machos, con 10 repeticiones. La producción de huevo fue variable con un promedio de 34 por hembra. Los indicadores de desempeño mostraron diferencias significativas (P ≤ 0.05 entre sexos con respecto a 6 de ellos. Los resultados indican la factibilidad para su cultivo y producción de huevos y juveniles.Cambarellus (C. montezumae is an endemic crayfish from Mexico, which actual distribution is restricted to few lacustrine bodies of water. Here we present results on the reproduction of this species under controlled conditions with the aim to determine the feasibility of the production of eggs and juveniles, as an strategy for their rescue, re-population and culture. Two experimental assays were conducted, the first one, in 4 outdoor 800-L tanks recirculation aquaculture systems (RAS and the second, in 2-L plastic containers under laboratory conditions (PCL. For the first assay, 219 brooders were used during 335 days , obtaining 136 ovigerous females. Each female produced an average of 45 ± 23 eggs per spawn.. The eclosioned eggs averaged 83.7%, obtaining 3 162 juveniles. In RPL, F1 organisms obtained from RAS were maintained in a relation of 1 female: 2 male with 10 repetitions. Egg production was variable with an average of 34 eggs per females. Performance indicators showed significant differences (P ≤ 0.05 between males and females in 6 indicators. Results indicated the feasibility of culture and production of eggs and juveniles.

  18. Artemia (Crustacea, Anostraca in Chile: a review of basic and applied biology Artemia Crustacea, Anostraca en Chile: revisión de la biología básica y aplicada

    Directory of Open Access Journals (Sweden)

    Patricio De los Rios-Escalante

    2012-09-01

    Full Text Available The brine shrimp Artemia in Chile has been studied since the 1980s, initially on populations inhabiting shallow coastal and inland mountain ponds, and saltworks in northern and central Chile. Based on morphometric and molecular evidence, these populations were identified as A. franciscana. In the 1990s, A. persimilis was recorded from southern Patagonia, a species previously considered endemic to Argentina. Recently, two new populations of A.franciscana have been recorded, from one saline coastal pond in northern Chile and from a saltwork in central Chile. The scope for further research to increase both understanding of the strain characterization and basic population ecology descriptions of the Chilean brine shrimps and improve their conservation status is discussed. It is suggested that future studies should investigate first the management of local brine shrimp population for local aquaculture or conservation resources, other direction would be the effects of ultraviolet radiation (UVR exposition that is notoriously high in brine shrimp habitats. This last factor is very important because the UVR is an important mutagen on the genetic structure of the populations. In this scenario, it is suggest a carefully management for introduced brine shrimp populations for local aquaculture for avoid alterations in native populations that due their genetic isolation would need conservation procedures for avoid local extinctions.El camarón de salmuera o Artemia ha sido estudiado en Chile desde la década de 1980, las primeras descripciones de poblaciones fueron para lagunas someras en zonas costeras y de montana, y en salinas artificiales en la zona central y norte de Chile. Sobre la base de evidencias morfométricas y moleculares estas poblaciones fueron descritas como A. franciscana. En la década de 1990, se describió la presencia de A. persimilis en la zona sur de la Patagonia, lo cual fue una ampliación del rango de distribución significativa, pues esta especie se le consideró endémica de Argentina. Recientemente dos nuevas poblaciones de A. franciscana fueron reportadas en una laguna somera en el norte y para una salina artificial en la zona central. El objetivo del presente estudio fue realizar una investigación para entender la caracterización de poblaciones y ecología básica de las poblaciones chilenas del camarón de salmuera y discutir como mejorar el estado de la conservación de estas. Se discute que a futuro los estudios se deberían enfocar primero al manejo de poblaciones nativas para acuicultura local o como un recurso para su conservación, otras orientaciones de estudio, podrían ser los efectos de la radiación ultravioleta (UVR que es notoriamente alta en los hábitats del camarón de salmuera. Este último factor es importante porque la radiación ultravioleta es un agente mutágeno importante en la estructura genética de las poblaciones. En este escenario, se sugiere un manejo cuidadoso de las poblaciones introducidas del camarón de salmuera para la acuicultura local, con el fin de evitar alteraciones en las poblaciones nativas que debido a su aislamiento genético necesitarían procedimientos para su conservación con el fin de evitar extinciones locales.

  19. Morphometric differences in two calanoid sibling species, Boeckella gracilipes and B. titicacae (Crustacea, Copepoda Diferencias morfométricas en dos especies hermanas Boeckella gracilipes y Boeckella titicacae (Crustacea, Copepoda

    Directory of Open Access Journals (Sweden)

    Patricio De los Ríos Escalante

    2012-12-01

    Full Text Available Calanoid copepods are abundant in South American inland waters and include widespread species, such as Boeckella gracilipes (Daday, 1902, which occurs from the Ecuador to Tierra del Fuego Island. This species occurs under various environmental conditions, and is found in oligotrophic lakes in Patagonia (39-54°S and in shallow mountain lakes north of 39°S. The aim of the present study is to conduct a morphometric comparison of male specimens of B. titicacae collected in Titicaca and B. gracilipes collected in Riñihue lakes, with a third population of B. gracilipes collected in shallow ponds in Salar de Surire. Titicaca and Riñihue lakes are stable environments, whereas Salar de Surire is an extreme environment. These ponds present an extreme environment due to high exposure to solar radiation and high salinity levels. The results of the study revealed differences among the three populations. These results agree well with systematic descriptions in the literature on differences between the populations of Titicaca and Riñihue lakes, and population of Salar de Surire differs slightly from the other two populations. It is probable that the differences between the population of Salar de Surire and the other two populations result from the extreme environment in Salar de Surire. High exposure to solar radiation, high salinity and extreme variations in temperature enhance genetic variations that are consequently expressed in morphology.Los copépodos calanoideos son abundantes en aguas continentales sudamericanas e incluyen especies de amplia distribución geográfica como Boeckella gracilipes (Daday, 1902 que se encuentra desde Ecuador hasta la isla de Tierra del Fuego. Esta especie vive bajo varias condiciones ambientales, y se encuentra en lagos oligotróficos en la Patagonia (39-54°S y en lagunas superficiales de montaña al norte de los 39°S. El objetivo del presente trabajo es realizar un estudio comparativo morfométrico de machos de B. titicacae colectado en el lago Titicaca y B. gracilipes colectado en el lago Riñihue, ambos son ambientes estables, con una tercera población colectada en lagunas superficiales en el Salar de Surire. Estas lagunas tienen condiciones ambientales extremas debido a alta exposición a la radiación solar y altos niveles de salinidad. Los resultados del presente estudio encontraron diferencias entre las tres poblaciones. Estos resultados concordarían con las descripciones sistemáticas en la literatura sobre las diferencias de las poblaciones de los lagos Titicaca y Riñihue, y la población del salar de Surire tuvo leves diferencias respecto a las dos poblaciones anteriores. Es probable que las diferencias entre la población del Salar de Surire y las otras dos se deban a alta exposición a la radiación solar, salinidad y condiciones extremas de temperatura que acelera las diferencias genéticas las que se expresan en diferencias morfológicas.

  20. The distribution of littoral caprellids (Crustacea: Amphipoda: Caprellidea along the Pacific coast of continental Chile La distribución de caprélidos litorales (Crustacea: Amphipoda: Caprellidea en la costa del Pacífico de Chile continental

    Directory of Open Access Journals (Sweden)

    MARTIN THIEL

    2003-06-01

    Full Text Available Many littoral caprellid species have a very ample distribution, some having been reported from all over the world. The cosmopolitan distribution of many littoral caprellid species might be facilitated by the fact that they are often associated with fouling communities on floating objects, which have a high potential of far-range dispersal. This dispersal potential may also have implications for the distribution of caprellids on local and regional scales. Herein we examined the distribution of littoral caprellid species on two spatial scales, local (tens of kilometers and regional (hundreds of kilometers along the Pacific coast of continental Chile. On the local scale, we studied the caprellid fauna in different habitats (intertidal boulders, subtidal algal and seagrass beds, fouling community on buoys and ropes; on the regional scale we focused only on caprellids associated with the fouling community on buoys and ropes. We found a total of six caprellid species, some of which were very abundant both on the local as well as on the regional scale. On the local scale we found a difference between the three studied habitat types with respect to the assemblage of caprellid species, some of which were found in more than one habitat. The highest species richness and abundance of caprellids was found in the fouling community associated with anchored buoys and ropes. On the regional scale we found very high numbers of caprellids in the fouling community of the northern region (n of 30°S, and decreasing abundances and species richness in the central region (30-37° S. No caprellids were found in the southern region of the study area (37-42° S. This pattern coincides with the global distribution of littoral caprellid species, which are most abundant and diverse at low latitudes but occur in low abundances and low diversity at high latitudes. Detached buoys that were found a few km off the coast harbored similar caprellid assemblages (including ovigerous females as anchored buoys, suggesting that buoys and other floating substrata (litter, macroalgae may facilitate dispersal of caprellids (and other epibiota along the Pacific coast of Chile. Since artificial and natural floating substrata are also abundant at high latitudes it is inferred that the low diversity of littoral caprellids at high latitudes is not due to lack of dispersal vectors, but rather of other factorsMuchas especies de caprélidos del litoral presentan una amplia distribución, algunas han sido citadas a lo largo de todo el mundo. La distribución cosmopolita de muchas especies de caprélidos podría deberse al hecho de que se asocian frecuentemente a las comunidades "fouling" en objetos flotantes, que presentan una capacidad importante de dispersión a largas distancias. Esta capacidad de dispersión puede tener implicaciones en la distribución de caprélidos a escala local y regional. En este estudio, nosotros examinamos la distribución de las especies de caprélidos litorales en dos escalas espaciales, local (decenas de kilómetros y regional (cientos de kilómetros, a lo largo de la costa Pacífico de Chile continental. A escala local se estudió la fauna de caprélidos en distintos hábitats (bolones intermareales, praderas de algas y fanerógamas marinas, comunidades "fouling" de boyas y cuerdas; a escala regional el estudio se centró solamente en los caprélidos asociados a boyas y cuerdas. Se encontraron un total de seis especies de caprélidos, algunos de los cuales fueron muy abundantes a escala local y regional. A escala local, existió una diferencia entre los tres tipos de hábitat con respecto a la fauna de caprélidos, algunos de los cuales estuvieron presentes en más de un hábitat. Los valores más altos de riqueza específica y abundancia se encontraron en la comunidad "fouling" asociada a boyas y cuerdas ancladas. A escala regional, los caprélidos fueron más abundantes y diversos en las comunidades "fouling" de la región norte (n de 30° S, mientras que la abundancia y riqueza de especies disminuyeron en la región central (30-37° S. No se encontraron caprélidos en la región sur del área de estudio (37-42° S. Este patrón coincide con la distribución global de especies de caprélidos litorales, mostrando los valores más altos de abundancia y riqueza de especies en las bajas latitudes y los valores más bajos en las altas latitudes. Boyas desprendidas desde sus amarras y encontradas a varios km de la costa albergaron asociaciones de caprélidos (incluyendo hembras ovígeras similares a las de las boyas fijadas, sugiriendo que las boyas y otros sustratos flotantes pueden facilitar la dispersión de caprélidos (y otra epifauna a lo largo de la costa Pacífico de Chile. Teniendo en cuenta que los sustratos flotantes naturales y artificiales son también abundantes en altas latitudes se infiere que la baja diversidad de caprélidos litorales en altas latitudes no se debe a la falta de vectores dispersantes sino a otros factores

  1. 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.

  2. Coadaptation: lessons from the brine shrimp Artemia, "the aquatic Drosophila" (Crustacea; Anostraca Coadaptación: lecciones desde el camarón de salmuera Artemia, "la Drosophila acuática" (Crustacea; Anostraca

    Directory of Open Access Journals (Sweden)

    GONZALO GAJARDO

    2001-03-01

    Full Text Available During the fifties Brncic and the Dobzhansky's school, using the fruit fly Drosophila as a test organism, introduced the term integration of the genotype, or genetic coadaptation, which has had great impact on thinking in today's evolutionary biology. In this work we use the brine shrimp Artemia - in many respects a sort of aquatic Drosophila- as a model organism to evaluate the relationship between population structure, potential for divergence and the degree of morphological and/or genetic change. These aspects, tightly linked with the organization of the genotype, are important to understanding how recombination and adaptive release of genetic and phenotypic variation affect the speciation process in Artemia. Analysis of genetic (allozyme, diploid and chromocentre numbers, morphological (Mahalanobis distances and reproductive data (cross-fertility tests available for populations of the bisexual, endemic species of the Americas, Artemia franciscana and A. persimilis, indicate that: (i A. franciscana and A. persimilis are morphologically distinct in correspondence with observed genetic differences (D Nei > 1; 2n = 42 and 44; 12.5 and 1.5 mean chromocentre numbers, respectively; (ii populations from Chile and other South American localities (mainly A. franciscana display high levels of genetic variability and a trend to develop large genetic distances between populations; (iii the plasticity of Artemia gene pool is associated, at least in part, with ecological heterogeneity. Hence an adaptive divergence mode is thought to best define the speciation process in Artemia; (iv the succesful production of laboratory hybrids in the allopatric Artemia populations studied in the Americas, a feature seen in other anostracods, could be explained by the fact that formerly allopatric populations have not achieved later sympatry, as required by the allopatric speciation paradigmEn los años cincuenta Brncic y la escuela de Dobzhansky introdujeron el término integración del genotipo, o coadaptación genética, usando la mosca de la fruta Drosophila como organismo de experimentación, el cual ha tenido gran impacto en el la biología evolutiva actual. En este trabajo utilizamos al camarón de salmuera Artemia, en muchos aspectos una suerte de Drosophila acuática, como organismo modelo para evaluar la relación entre estructura poblacional, potencial de divergencia y el grado de cambio morfológico y/o genético. Estos aspectos, estrechamente ligados a la organización del genotipo, son importantes para entender como la recombinación y la liberación adaptativa de variación genética y fenotípica afectan el proceso de especiación en Artemia. El análisis de datos genéticos (aloenzimas, número diploide y de cromocentros, morfológicos (distancia de Mahalanobis y reproductivos (pruebas de fertilidad cruzada disponibles para las poblaciones bisexuales, endémicas de las Americas, Artemia franciscana y A. persimilis, indican que: (i A. franciscana y A. persimilis son morfológicamente distintas en correspondencia con las diferencias genéticas observadas (D Nei > 1; 2n = 42 y 44; 12,5 y 1,5 número promedio de cromocentros, respectivamente; (ii poblaciones de Chile y otras localidades Sudamericanas (principalmente A. franciscana exhiben altos niveles de variabilidad genética y una tendencia a desarrollar grandes distancias genéticas entre poblaciones; (iii la plasticidad del acervo de genes en Artemia está asociado, al menos en parte, con la heterogeneidad ecológica. Por este motivo el modelo de divergencia adaptativa es el que mejor define el proceso de especiación en Artemia; (iv la producción de híbridos de laboratorio entre las poblaciones alopátricas de América estudiadas, un rasgo observado también en otros anostrácodos, podría explicarse por el hecho de que poblaciones originalmente alopátricas no han logrado posterior simpatría, como requiere el paradigma de especiación alopátrico

  3. Aspectos anatômicos e funcionais do aparelho reprodutor de Parastacus brasiliensis (von Martens (Crustacea, Decapoda, Parastacidae Anatomical and functional aspects of the reproductive system of Parastacus brasiliensis (von Martens (Crustacea, Decapoda, Parastacidae

    Directory of Open Access Journals (Sweden)

    Alexandre Oliveira de Almeida

    1997-01-01

    Full Text Available The absence of morphological external characteristics that allow the recognition of the sex as well as the presence of both male and female gonopores in the same animal [except in some sexual forms of Parastacus nicoleti (Philippi, 1882] gives rise to the hypothetical existence of some form of hermaphroditism in crayfishes belonging to the genus Parastacus Huxley, 1879. Specimens of Parastacus brasiliensis (von Martens, 1869 were collected in a rivulet at Mariana Pimentel municipality, Rio Grande do Sul, Brazil. In the laboratory they were reared and dissected. The results suggest that P. brasiliensis may be a sequential hermaphroditic species, but male and female gonadal tissues were not simultaneously present in the analized samples. In testes and ovaries two pairs of genital ducts are present; that connect, respectively, to the gonopores on the coxae of the fifth and the third pairs of pereiopods. In the females only the apertures and anterior ducts seem to be functional, while in the males only the apertures and posterior ducts may be functional. The existence of different degrees of obstruction in the female genital apertures and different degrees of projection in the male genital apertures was observed. The aspect of the gonopores were used to recognize, externally, the sex of animais.

  4. Spatial distribution of the Ocypode quadrata (Crustacea: Ocypodidae along estuarine environments in the Paranaguá Bay Complex, southern Brazil Distribuição espacial de Ocypode quadrata (Crustacea: Ocypodidae ao longo de ambientes estuarinos no sul do Brasil

    Directory of Open Access Journals (Sweden)

    Leonardo C. da Rosa

    2008-09-01

    Full Text Available This study examines the spatial distribution of the ghost crabs, Ocypode quadrata Fabricius, 1787, in thirteen estuarine sandy beaches located along two main axes of the Paranaguá Bay Estuarine Complex, southern Brazil. Burrow densities of ghost crabs were measured at three beach levels established around the high tide mark during the summer and winter of 2005. All beaches showed a steep beach face slope (2.6 to 8.3º with sediment composition varying from well sorted fine sand to very poorly sorted coarse sand towards the upper estuary. Water salinity ranged from around 31 at those beaches near the bay inlet, to 14 at beaches in the inner estuary. The burrow densities of O. quadrata in the estuarine beaches were similar to those observed in the oceanic beaches. However, the absence of burrows at the four innermost beaches suggests that low salinity and sediment penetrability may prevent ghost crabs from occurring in this region of the estuary. Burrow densities showed strong seasonal variability. The low densities observed during the winter are probably related to a delay crab activities due to low temperatures in the early morning during this season. The absence of a clear zonation pattern was related to estuarine beach morphology.O presente estudo avalia a distribuição espacial de Ocypode quadrata Fabricius, 1787 em treze praias estuarinas distribuídas ao longo dos dois principais eixos do complexo estuarino da Baia de Paranaguá, sul do Brasil. Em cada praia, a densidade de tocas do caranguejo em três níveis distribuídos em torno da marca da preamar foi estimada durante os períodos de verão e de inverno. Todas as praias apresentaram uma declividade bem acentuada (2,6 a 8,3º de inclinação e a composição do sedimento variando, em direção ao interior do estuário, de areia fina bem selecionada a areia grossa muito pobremente selecionada. A salinidade da água variou entre 31 (próximo à desembocadura da baía e 14 nas praias estuarinas mais internas. As densidades de tocas de O. quadrata nas praias estuarinas foram similares às registradas para as praias oceânicas. Entretanto, a ausência de tocas nas quatro praias estuarinas mais internas sugere que a salinidade junto com a penetrabilidade do sedimento possam ser fatores que inibam a ocorrência desse caranguejo nas regiões superiores do estuário. Entre as outras praias, a densidade de tocas mostrou uma marcada sazonalidade; os baixos valores observados durante o inverno estão provavelmente relacionados a um atraso na atividade dos caranguejos devido às baixas temperaturas durante o começo das manhãs de inverno. A ausência de um claro padrão de zonação foi relacionada à particular morfologia das praias estuarinas.

  5. Spatial distribution of the Ocypode quadrata (Crustacea: Ocypodidae) along estuarine environments in the Paranaguá Bay Complex, southern Brazil Distribuição espacial de Ocypode quadrata (Crustacea: Ocypodidae) ao longo de ambientes estuarinos no sul do Brasil

    OpenAIRE

    Leonardo C. da Rosa; Carlos A. Borzone

    2008-01-01

    This study examines the spatial distribution of the ghost crabs, Ocypode quadrata Fabricius, 1787, in thirteen estuarine sandy beaches located along two main axes of the Paranaguá Bay Estuarine Complex, southern Brazil. Burrow densities of ghost crabs were measured at three beach levels established around the high tide mark during the summer and winter of 2005. All beaches showed a steep beach face slope (2.6 to 8.3º) with sediment composition varying from well sorted fine sand to very poorly...

  6. Condition factor of Goniopsis cruentata (Crustacea, Brachyura, Grapsidae from Mundaú/Manguaba estuarine complex, Alagoas, Brazil Fator de condição de Goniopsis cruentata (Crustacea, Brachyura, Grapsidae do complexo estuarino Mundaú/Manguaba, Alagoas, Brasil

    Directory of Open Access Journals (Sweden)

    José J. P. R. Lira

    2012-09-01

    Full Text Available The condition factor is a parameter which acts as a general indicator of the "well-being" of a species, and it can be obtained through the analysis of width vs. weight relationships. The present work aims to investigate size vs. weight relationship and the condition factor of the crab Goniopsis cruentata (Latreille, 1803. The study area was the Mundaú/Manguaba estuarine complex, Maceió, state of Alagoas, Northeast Brazil. Samplings were monthly accomplished from August 2007 to July 2008. A total of 626 individuals were analyzed, being 309 males and 317 females. Males were larger and heavier than females, what is expected in many brachyuran. The growth was positive allometric to both males (b = 3.42 and females (b = 3.30, not obeying the "cube law". The condition factor of female was higher than that of male crabs, probably due to the gonad weight of females. It also varied seasonally for both sexes, being higher in the autumn and winter in males, and in the autumn and spring in females, and related to the molt and period of spawning intensification.O fator de condição é um parâmetro que age como um indicador geral do "bem-estar" de uma espécie e pode ser obtido através da análise da relação largura-peso. O presente trabalho visa investigar a relação tamanho vs. peso e o fator de condição do caranguejo Goniopsis cruentata (Latreille, 1803. A área de estudo foi o complexo estuarino Mundaú/Manguaba, Maceió, estado de Alagoas, Nordeste do Brasil. As amostragens foram realizadas mensalmente de agosto de 2007 a julho de 2008. Um total de 626 indivíduos foi analisado, sendo 309 machos e 317 fêmeas. Os machos foram maiores e mais pesados que as fêmeas, o que é esperado em muitas espécies de braquiúros. O crescimento foi alométrico positivo tanto para machos (b = 3,42 quanto para fêmeas (b = 3,30, não obedecendo a "regra do cubo". O fator de condição da fêmea foi maior do que o dos machos, provavelmente devido ao peso das gônadas das fêmeas. O fator de condição também variou sazonalmente para ambos os sexos, sendo mais elevado no outono e no inverno nos machos, e no outono e primavera nas fêmeas, e estando relacionado à muda e ao período intenso de desova.

  7. The megalopa and early juvenile development of Hepatus pudibundus (Crustacea: Brachyura: Aethroidea reared from neuston samples A megalopa e o desenvolvimento juvenil inicial de Hepatus pudibundus (Crustacea: Brachyura: Aethroidea criado a partir de amostras de neuston

    Directory of Open Access Journals (Sweden)

    Maria L. Negreiros-Fransozo

    2008-12-01

    Full Text Available Hepatus pudibundus (Herbst, 1785 is a crab commonly found in shallow waters of the Western Atlantic. Its larval and early post-larval morphology have already been described from laboratory hatched material. Around 200 megalopae of H. pudibundus were collected in neuston samples from the Ubatuba region, Brazil, during the summer of 2005-2006 and were successfully reared under laboratory conditions. The size of the megalopae obtained in the neuston was similar to those specimens previously described in the literature, except that the juvenile crab stages reared in the laboratory were slightly larger, probably due to the better feeding conditions in the laboratory. The duration of the juvenile stages was shorter in the present study than in previous attempts at laboratory rearing, even if conditions appeared to be similar. The main differences observed between studies were in megalopal morphology, which may be attributable to intraspecific variation but, possibly, also due to differences in levels of detail than previously performed.Hepatus pudibundus (Herbst, 1785 é um caranguejo comumente encontrado em águas rasas do Atlântico Ocidental. O desenvolvimento larval completo e a sua morfologia pós-larval já são conhecidos a partir de fêmeas ovígeras. Cerca de 200 megalopas de H. pudibundus foram coletadas no neuston durante o verão de 2005-2006, na região de Ubatuba, São Paulo, Brasil e criadas com sucesso sob condições de laboratório. O tamanho da megalopa obtida no neuston foi semelhante àquela dos exemplares descritos previamente na literatura, mas os estágios juvenis criados no laboratório foram ligeiramente maiores na fase inicial, provavelmente devido às melhores condições de alimentação no laboratório. A duração dos estágios juvenis foi menor na presente investigação, do que no estudo anterior, mesmo sob condições laboratoriais similares. As principais diferenças entre os estudos foram com relação à morfologia da megalopa, as quais podem ser atribuídas às variações intra-específicas, mas possivelmente, também, ao nível de detalhe empregado previamente.

  8. Alometria no crescimento de Uca mordax (Smith (Crustacea, Decapoda, Ocypodidae na Baía de Guaratuba, Paraná, Brasil Allometric growth in the fiddler crab Uca mordax (Smith (Crustacea, Decapoda, Ocypodidae from Guaratuba Bay, Parana, Brazil

    Directory of Open Access Journals (Sweden)

    Setuko Masunari

    2005-12-01

    Full Text Available Um estudo do crescimento relativo da maior quela do macho e do abdome da fêmea foi realizado numa população do caranguejo chama-maré Uca mordax (Smith, 1870 ocorrente no extremo oeste da Baía de Guaratuba, Paraná, sul do Brasil. O comprimento da maior quela (CMQ foi medido em 319 machos, e a largura do abdome (LAB em 356 fêmeas. Adicionalmente, seis chama-marés sexualmente indiferenciados foram analisados. A largura da carapaça (LC foi escolhida como dimensão de referência para ambos os sexos, a qual variou de 1,94 a 20,0 mm para machos, de 2,50 a 18,85 mm para fêmeas, e de 1,94 a 3,15 para os indivíduos sexualmente indiferenciados. A relação entre o LC e CMQ mostrou um ponto de inflexão em 11,70 mm LC nos machos, e entre LC e LAB, em 8,77 mm LC dentre as fêmeas. Os machos (média LC = 14,24 mm atingiram tamanhos pouco maiores do que as fêmeas (média LC = 13,97 mm. O crescimento foi alométrico positivo durante toda a ontogênese de ambos os sexos, isto é, antes e depois da muda puberal. As equações das relações entre LC e CMQ nos machos foram: logCMQ = -0,542265 + 1,51.logLC para machos juvenis e logCMQ = -1,446281 + 2,37.logLC para machos adultos. Nas fêmeas, a relação entre LC e LAB foi: logLAB = -0,607282 + 1,22.logLC e logLAB = -0,912074 + 1,60.logLC, respectivamente, para juvenis e adultas. Estas dimensões estão relacionadas com as atividades reprodutivas da espécie. O nível de alometria do CMQ dos machos adultos de U. mordax foi o mais alto dentre as espécies do gênero, cujo crescimento relativo desta dimensão foi estudado. A proporção de machos destros foi estatisticamente a mesma daqueles sinistros (1:1.Relative growth of the male major chela and female abdomen was studied in a population of the fiddler crab Uca mordax (Smith, 1870 from Guaratuba Bay, Parana, Southern Brazil. Major chela length (CMQ was measured from 319 males, and abdomen width (LAB from 356 females. Also six small sexually undifferentiated crabs were measured. Carapace width (LC was the reference dimension for both sexes, which ranged from 1.94 to 20.0 mm for males, from 2.50 to 18.85 mm for females, and from 1.94 to 3.15 mm for sexually undifferentiated crabs. Relationship between LC and CMQ showed a transition point at 11.70 mm LC in males, and between LC and LAB, at 8.77 mm LC in females. Males (mean LC = 14.24 mm showed a slightly greater size than females (mean LC = 13,97 mm. These dimensions had positive allometrical growth during all life for both sexes: before and after the puberal molting. Regressions between LC and CMQ in males read as: logCMQ = -0,542265 + 1,51.logLC for male juveniles and logCMQ = -1,446281 + 2,37.logLC for male adults. In females, the regressions between LC and LAB were: logLAB = -0,607282 + 1,22.logLC for juveniles and logLAB = -0,912074 + 1,60.logLC for adults. These body dimensions are related to reproductive activities of this species. The level of allometry in CMQ of adult males was the highest among Uca species which relative growth of this dimension is known. The handedness had a proportion of 1:1 between right-handed and left-handed males.

  9. Efeito da densidade populacional sobre as curvas de crescimento de Macrobrachium rosenbergii (De Man em cultivo semi-intensivo (Crustacea, Palaemonidae The effect of stocking density on Macrobrachium rosenbergii (De Man growth curves in earthen ponds (Crustacea, Palaemonidae

    Directory of Open Access Journals (Sweden)

    Wagner Cotroni Valenti

    1993-01-01

    Full Text Available In this article the length growth curves of Macrobrachium rosenbergii (De Man, 1879 held in different population densities were analysed. Postlarvae prawns were stocked into five 0,02 ha earthen ponds at densities of 4, 8, 12, 16 and 20 ind./m² during six months. Forthnightly, the mean total length of animals from each pond were obtained by means of random samples. For each population the length growth curves and the instantaneous growth rate expressions were determined. The growth rate and the asymptotic maximum length decreased with the stocking density raised. This effect is greater when the density ranges in low levels. The growth decrease can be due to intraspecific competition for life resources and to negative interactions between individuals, as aggressive or social behavior, that increase with the increase prawns density.

  10. 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

    Directory of Open Access Journals (Sweden)

    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

  11. Meat yield of Callinectes bocourti A. Milne Edwards, 1879 (Crustacea, Portunidae in Iguape, São Paulo, Brazil Rendimiento de la carne de Callinectes bocourti A. Milne Edwards, 1879 (Crustacea, Portunidae, en Iguape São Paulo, Brasil

    Directory of Open Access Journals (Sweden)

    Gustavo Yomar-Hattori

    2006-11-01

    Full Text Available The objective of the present study was to analyze the meat yield for both sexes of the crab Callinectes bocourti in the region of Iguape, Brazil. The carapace width for males was 78.1-114.0 mm (96.7 ± 9.5 mm and for females 76.0-106.3 mm (93.0 ± 7.8 mm. In males, the total wet weight ranged from 65.53 to 224.36 g (134.04 ± 40.77 g and for females from 56.66 to 164.74 g (105.93 ± 26.88 g. A comparison of morphological structures revealed that the greatest meat yield was in the carapace (55.1%, followed by the right chela (16.9%, the left chela (15.9%, and the legs (12.1%. The total yield from the males (28.5% was slightly higher than that from the females (22.1%. In general, portunids yield more meat than other crab species. The results of this study will allow the optimization of meat production for this crab species. Manual meat removal makes the process more expensive. This activity could offer an alternative to the fishing communities that live exclusively from this fishery resourceEl objetivo del presente estudio fue analizar el rendimiento de la carne del cangrejo Callinectes bocourti en ambos sexos en la región de Iguape, Brasil. Los machos presentaron un ancho de carapazón entre 78,1 y 114,0 mm (96,7 ± 9,5 mm y las hembras 76,0 a 106,3 mm (93,8 ± 7,8 mm. El peso húmedo total de los machos varió de 65,53 a 224,36 g (134,04 ± 40,77 g y entre 56,66 y 164,74 g (105,93 ± 26,88 g en las hembras. Comparando las estructuras morfológicas, se encontró que el mayor rendimiento de carne estuvo en el carapazón (55,1%, seguido de la pinza derecha (16,9%, izquierda (15,9% y patas (12,1%. En los machos el rendimiento total fue 28,5%, levemente superior al de las hembras (22,1%. Los portúnidos generalmente presentaron mayor rendimiento de carne al compararlo con otras especies de cangrejos. Los resultados de este estudio permiten optimizar la producción de carne en esta especie de cangrejo. La remoción de la carne es una actividad manual, lo que encarece este proceso. Esta actividad puede ser considerada una alternativa para las comunidades pesqueras que viven exclusivamente de ese recurso pesquero

  12. Biologia populacional de Emerita brasiliensis Schmitt (Crustacea, Hippidae na Praia Vermelha do Norte, Ubatuba (São Paulo, Brasil Population biology of Emerita brasiliensis Schmitt (Crustacea, Hippidae in Vermelha do Norte beach, Ubatuba (São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Jelly Makoto Nakagaki

    1999-01-01

    Full Text Available Emerita brasiliensis Schmitt, 1935 is a common mole crab called "tatuíra" in Brazil, with distribution from Espírito-Santo State (Brazil to Buenos Aires Province (Argentina. Specimens were collected bimonthly from May/1992 through March/1993 with 4mm siffers mesh, in the intertidal region at Vermelha do Norte Beach, Ubatuba, São Paulo, Brazil. The animals were sexed and measured with a precision caliper of 0.1 mm (Cl = carapace length. Males presented cl amplitude from 3.4-17.3mm (13.2±2.1mm, and females from 13.8-26.3mm (20.5±1.8mm, showing a well-defined sexual dimorfism for this variable. The population presented a smaller incidence of males in relation to females (0.54:1.00, however in May/1992 an inverse pattern occurred (1.84:1.00. Ovigerous females were present in all samples with exception of May and September/1992 with greater frequencies in July/1992 and January/1993. It is probable that female maturity occurs is reached with 17mm CL, the smallest size in wich ovigerous females were found.

  13. The freshwater amphipods Hyalella Smith, 1874 in Chile (Crustacea: Amphipoda Los anfípodos de agua dulce del género Hyalella Smith, 1874 en Chile (Crustacea: Amphipoda

    Directory of Open Access Journals (Sweden)

    EXEQUIEL R. GONZÁLEZ

    2003-12-01

    Full Text Available The Chilean fauna of amphipods has been poorly studied. Freshwater amphipods in Chile have a single genus in epigean environments. Seven species of the genus Hyalella are reported for Chile: H. simplex; H. fossamancinii, H. kochi; H. chiloensis; H. costera; H. araucana, and H. franciscae. A short diagnosis, a key and figures are given for each speciesLa fauna de anfípodos chilenos ha sido pobremente estudiada. En el caso de los de agua dulce y de ambientes epigeos, el grupo está representado solo por un género. Se reportan siete especies del género Hyalella para Chile: H. simplex; H. fossamancinii, H. kochi; H. chiloensis; H. costera; H. araucana, y H. franciscae. Se entrega una breve diagnosis, una clave y figuras para cada especie

  14. Aspectos reprodutivos de Goniopsis cruentata (Latreille (Crustacea, Brachyura, Grapsidae na Baía de Sepetiba, Rio de Janeiro, Brasil Reproductive aspects of Goniopsis cruentata (Latreille (Crustacea, Brachyura, Grapsidae at the Sepetiba Bay, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    Zilanda de Souza Silva

    2002-09-01

    Full Text Available The objective of this study was to get some knowledge about the reproductive aspects of Goniopsis cruentata (Latreille, 1803, concerning through sex ratio, morphological sexual maturity, reproductive period, fecundity and eggs size. The crabs were collected monthly in Itacuruçá's Mangroves from November, 1997 to November, 1998. Four hundred and seven crabs were caught and they were 47% males, 36% females and 17% ovigerous females. The sex ratio was 1:1.13 (male:female (X²= 1.54, p > 0.05. The relation of abdomen width (AW and carapace width (CW in females showed a positive allometric grow (b = 1.36, it suggests the size onset of maturity occur from 26.0 a 29.0 mm (CW in females. The ovigerous females occured during all the research period, except for the winter months (June to August. The size of these ovigerous females varied from 26.0 to 48.8 mm with mean size 35.1 + 5.2 mm. Individual fecundity varied from 29,975 to 142,050 eggs and mean fecundity was 74,751 ± 27 eggs. The mean diameter of the eggs was 300 ± 20 µm.

  15. Espécies do gênero Munida Leach (Crustacea, Decapoda, Galatheidae, distribuídas na costa do Brasil Species of the genus Munida Leach (Crustacea, Decapoda, Galatheidae with distribution in the Brazilian coast

    Directory of Open Access Journals (Sweden)

    Gustavo A.S. de Melo-Filho

    2001-12-01

    Full Text Available The purpose of this work is to analyse the taxonomy and distributional patterns of the species of the genus Munida Leach, 1820 which occur along the Brazilian coast. The species of Munida present some peculiar characteristics, rarely found in any other marine group. They live in groups with great number of individuals (gregariousness and with several species found together in the same population (sintopy. In addition, they exhibit a great degree of intraspeciftc variation and, paradoxally, a little variability among the species. These factors make a better understanding of the systematics of this group very difficult. In the present study the utilization of non variable characters was emphasized. As a corollary of this study, "species-complexes" were defined including groups of species morphologically very similar but yet well characterized. Sixteen species with distribution along the Brazilian coast were studied. An identification key is provided. A general discussion where the main problems on taxonomy and distributional patterns of species were analysed was done.

  16. Espécies do gênero Munida Leach (Crustacea, Decapoda, Galatheidae), distribuídas na costa do Brasil Species of the genus Munida Leach (Crustacea, Decapoda, Galatheidae) with distribution in the Brazilian coast

    OpenAIRE

    Gustavo A.S. de Melo-Filho; Gustavo A.S. de Melo

    2001-01-01

    The purpose of this work is to analyse the taxonomy and distributional patterns of the species of the genus Munida Leach, 1820 which occur along the Brazilian coast. The species of Munida present some peculiar characteristics, rarely found in any other marine group. They live in groups with great number of individuals (gregariousness) and with several species found together in the same population (sintopy). In addition, they exhibit a great degree of intraspeciftc variation and, paradoxally, ...

  17. Ultraestrutura do espermatozóide de Ucides cordatus Linnaeus (Crustacea, Ocypodidae do litoral norte do Brasil Ultrastructure of spermatozoon of the crab Ucides cordatus Linaeus (Crustacea, Decapoda of the northern littoral of Brazil

    Directory of Open Access Journals (Sweden)

    Edilson Matos

    2000-09-01

    Full Text Available Ultrastructure of spermatozoa of the crab Ucides cordatus Linnaeus, 1763 is described and illustrated. Three parts can be distinguished: 1. the elongate-ovoid acrosome located anteriorly; 2. the cytoplasmic region; and 3. the nuclear region. The acrosome is composed of a thick electron-dense wall and a less electron-dense subacrosomal space. The cytoplasm region connects the acrosome with the nucleus, and three arms filled with microtubules arise from this region. The nucleus is polymorphous. The spermatozoon of Ucides cordatus follows the general pattern described for other Decapods.

  18. Ultraestrutura do espermatozóide de Ucides cordatus Linnaeus (Crustacea, Ocypodidae) do litoral norte do Brasil Ultrastructure of spermatozoon of the crab Ucides cordatus Linaeus (Crustacea, Decapoda) of the northern littoral of Brazil

    OpenAIRE

    Edilson Matos; Patrícia Matos; Laura Corral; Carlos Azevedo

    2000-01-01

    Ultrastructure of spermatozoa of the crab Ucides cordatus Linnaeus, 1763 is described and illustrated. Three parts can be distinguished: 1. the elongate-ovoid acrosome located anteriorly; 2. the cytoplasmic region; and 3. the nuclear region. The acrosome is composed of a thick electron-dense wall and a less electron-dense subacrosomal space. The cytoplasm region connects the acrosome with the nucleus, and three arms filled with microtubules arise from this region. The nucleus is polymorphous....

  19. The genus Artemia Leach, 1819 (Crustacea: Branchiopoda: I. True and false taxonomical descriptions El género Artemia Leach, 1819 (Crustacea: Branchiopoda: I. Descripciones taxonómicas verdaderas y falsas

    Directory of Open Access Journals (Sweden)

    Alireza Asem

    2010-01-01

    Full Text Available The brine shrimp Artemia is important for aquaculture since it is bighly nutritious. It is also used widely in biological studies because it is easy to culture. The aim of the present study is to review the literature on the taxonomical nomenclature of Artemia. The present study indicates the existence of seven species: three living in the Americas, one in Europe, and three in Asia.El camarón de salmuera Artemia es importante para la acuicultura por su alta calidad nutricional y es muy utilizado para estudios biológicos por ser de fácil cultivo. El objetivo del presente estudio es revisar la literatura sobre la nomenclatura taxonómica de Artemia. Se determina la existencia de siete especies; tres de ellas viven en América, una en Europa y tres en Asia.

  20. Monosacáridos terminales presentes en las cubiertas ovocitarias del camarón de roca Rhynchocinetes typus (Crustacea, Decapoda Terminal monosaccharid on the oocyte envelope of the shrimp rock Rhynchocinetes typus (Crustacea, Decapoda

    Directory of Open Access Journals (Sweden)

    Daniel Gómez

    2002-01-01

    Full Text Available Durante la primera interacción gamética, los oligosacáridos de las glicoproteínas presentes en las cubiertas ovocitarias son importantes en el reconocimiento del espermatozoide. Estos oligosacáridos presentan monosacáridos terminales que pueden ser reconocidos mediante lectinas específicas. En otras especies marinas no sólo se ha determinado la presencia de monosacáridos en las cubiertas ovocitarias sino que su número y ubicación varía durante la maduración del ovocito. El presente estudio determina la presencia de monosacáridos en las cubiertas ovocitarias y su ubicación durante la maduración del ovocito en el camarón de roca, mediante el uso de las siguientes lectinas específicas conjugadas con FITC: LCA, BS-1, LTA y Con-A, las cuales reconocen los monosacáridos manosa, galactosa, fucosa y glucosa respectivamente. Los resultados mostraron que manosa está presente en cantidades 2-3 veces mayores que los otros azúcares y que manosa, galactosa y glucosa se incrementan desde los 5 días premuda hasta los 2 días postmuda sin ser estadísticamente significativas. La fucosa presentó la menor concentración. Estos resultados sugieren que estos azúcares podrían participar en la primera interacción gamética, sin embargo, la participación en la fecundación debe ser determinada a través de ensayos de inhibición de la fecundación in vitro con espermatozoides previamente tratados con estos azúcares a fin de bloquear los sitios que interactúan con las cubiertas de los ovocitosOligosaccharids of glycoproteins present in oocytes envelope during the first gamete interaction have an important role in the sperm recognizing process. The terminal monosaccharid of oligosaccharids can be recognized by specific lectins. The number and location of monosaccharid on the oocyte coat changes in many marine species according to the oocyte maturation. This study determines the presence of monosaccharids on the oocyte envelope and its location during the oocyte maturation by the following specific FITC-labeled lectins: LCA, BS-1, LTA and Con-A which recognize the mannose, galactose, fucose and glucose monosaccharid respectively. The results of the lectins experiments showed a high concentration of mannose (2-3 time on the mature oocyte coat. From 5 days pre-molt to 2 day post-molt he concentration of mannose, galactose and glucose increasing on the oocyte envelope increaded. The fucose monosacharide was 3 time less than mannose. This results suggest that mannose could be participating in the first gametic interaction., however the involvement of these carbohydrates during the fertilization must be determined by in vitro fertilization inhibition experiments

  1. Biologia reprodutiva de Talitroides topitotum (Burt (Crustacea, Amphipoda, Talitridae na Serra do Mar, Guaratuba, Paraná, Brasil Reproductive biology of Talitroides topitotum (Burt (Crustacea, Amphipoda, Talitridae from Serra do Mar, Guaratuba, Paraná, Brazil

    Directory of Open Access Journals (Sweden)

    Odete Lopez Lopes

    2004-12-01

    Full Text Available Uma análise da distribuição do comprimento do corpo e da correlação entre a fecundidade e o comprimento do corpo foi realizada em uma população do anfípodo terrestre Talitroides topitotum (Burt, 1934 no entorno da Usina Hidroelétrica de Guaricana, Serra do Mar, Guaratuba, Estado do Paraná, Brasil. Os anfípodos foram coletados com redes de Malaise erguidas em meio à Floresta Ombrófila, mensalmente, de junho de 1985 a junho de 1986. Um total 2191 anfípodos foi coletado, dos quais 1626 fêmeas com oostegitos, mas sem ovos no marsúpio, 558 fêmeas ovígeras, seis juvenis e um adulto sem caracteres sexuais secundários. Nenhum macho foi obtido. Os ovos contidos no marsúpio das fêmeas foram contados. O comprimento do corpo dos anfípodos foi obtido através de imagens fotografadas com o animal em decúbito lateral. Fêmeas maturas somaram 98,54% da população amostrada. O comprimento do corpo dos juvenis variou de 2,88 a 5,97 mm, enquanto o das fêmeas maturas (incluindo as ovígeras de 7,00 a 14,43 mm, sendo este valor máximo, o maior registrado até o presente para a espécie. A classe modal das fêmeas maturas sem ovos no marsúpio foi 8,50 mm, ao passo que a das fêmeas ovígeras, a de 9,50 mm. Fêmeas ovígeras estiveram presentes durante todo o ano, em percentual que variou de 8 a 40%; na distribuição da freqüência relativa, foram observados quatro picos (julho, outubro e dezembro de 1985 e março de 1986.An analysis of the body length distribution and correlation between the fecundity and body length was carried out in a population of the terrestrial amphipod Talitroides topitotum (Burt, 1934 from the neighborhood of Hydroelectric Plant of Guaricana, Serra do Mar, Guaratuba, State of Paraná, Brazil. The amphipods were collected with Malaise nets erected inside a Tropical Rain Forest, monthly, from June, 1985 to June, 1986. A total of 2191 amphipods were collected, from which 1626 females with oostegits but without eggs in the marsupium, 558 ovigerous females, 6 juveniles and an adult without any secondary sexual characters. No male was obtained. The eggs inside the female marsupium were counted. The body length of the amphipods was obtained through photographed images of the animals in lateral decubitus. Mature females summed 98.54% of the sampled population. The body length of the juveniles varied from 2.88 to 5.97 mm and that of mature females (including ovigerous ones from 7.00 to 14.43 mm up to the present, this is the larger, with the modal class of the mature females in 8.50 mm class and that of ovigerous in 9.50 mm class. The non-ovigerous females presented shorter body length than the ovigerous ones. Ovigerous females were present all year round, which percentage ranged from 8 to 40%; four peaks were observed (July, October, and December, 1985, and March, 1986 in relative frequency distribution. Fecundity varied from 1 to 10 eggs per female; mean of 3.34 per female. In spite of the linear tendency of the regression between fecundity and body length the correlation was very weak (r = 0.5675, p < 0.05. The adult population of T. topitotum from Guaricana can be characterized by number of pulses (four of ovigerous females during the year and by the absence of males.

  2. Registros nuevos de parásitos epicarideos (Crustacea: Isopoda en México y suroeste del golfo de México New records of epicaridean parasites (Crustacea: Isopoda from Mexico, and southwestern Gulf of Mexico

    Directory of Open Access Journals (Sweden)

    Ramiro Román-Contreras

    2011-12-01

    Full Text Available Anathelges hyptius (Thompson, 1902, Parabopyrella mortenseni (Nierstrasz y Brender á Brandis, 1929 y Metaphrixus carolii Nierstrasz y Brender á Brandis, 1931, son nuevos registros para México. Bopyrione synalphei Bourdon et Markham, 1980, Bopyrinella thorii (Richardson, 1904, Probopyrus pandalicola (Packard, 1879, y Probopyrus bithynis Richardson, 1904 se registraron por primera vez en la laguna de Términos, Campeche. Con la adición de estos registros y otras especies aún no descritas, se estima que el número de epicarideos para el Atlántico mexicano es ahora aproximadamente de 23 especies y de 42 para el país. Alpheus viridari (Armstrong, 1949 y Synalpheus apioceros Coutière, 1909 son nuevos hospederos para P. mortenseni y B. synalphei, respectivamente.Anathelges hyptius (Thompson, 1902, Parabopyrella mortenseni (Nierstrasz et Brender á Brandis, 1929 and Metaphrixus carolii Nierstrasz et Brender á Brandis, 1931, are new records for Mexico. Bopyrione synalphei Bourdon and Markham, 1980, Bopyrinella thorii (Richardson, 1904, Probopyrus pandalicola (Packard, 1879, and Probopyrus bithynis Richardson, 1904, are reported for the first time in Laguna de Terminos, Campeche. With the addition of new registered to a former list the number up approximately to 23 species in the Mexican Atlantic, and 42 species for Mexico. Alpheus viridari (Armstrong, 1949 and Synalpheus apioceros Coutière, 1909 are recorded as new hosts for Parabopyrella mortenseni and Bopyrione synalphei, respectively.

  3. Registros nuevos de parásitos epicarideos (Crustacea: Isopoda) en México y suroeste del golfo de México New records of epicaridean parasites (Crustacea: Isopoda) from Mexico, and southwestern Gulf of Mexico

    OpenAIRE

    Ramiro Román-Contreras; Mario Martínez-Mayén

    2011-01-01

    Anathelges hyptius (Thompson, 1902), Parabopyrella mortenseni (Nierstrasz y Brender á Brandis, 1929) y Metaphrixus carolii Nierstrasz y Brender á Brandis, 1931, son nuevos registros para México. Bopyrione synalphei Bourdon et Markham, 1980, Bopyrinella thorii (Richardson, 1904), Probopyrus pandalicola (Packard, 1879), y Probopyrus bithynis Richardson, 1904 se registraron por primera vez en la laguna de Términos, Campeche. Con la adición de estos registros y otras especies aún no descritas, se...

  4. On the taxonomical status of Arctodiaptomus dampfi Brehm (Crustacea: Copepoda: Diaptomidae with comments on A. dorsalis (Marsh

    Directory of Open Access Journals (Sweden)

    Eduardo SUÁREZ-MORALES

    2001-02-01

    Full Text Available Arctodiaptomus dampfi Brehm is a diaptomid copepod described from Lake Petén, in Guatemala. Due to the fact that the type material is lost and no additional material was available, the taxonomical status of this species remained unclear for more than 65 years. Arctodiaptomus dampfi has been advanced as a synonym of A. dorsalis and some authors followed this position; instead, others recognized this species in regional checklists. We collected zooplankton samples at Lake Petén, A. dampfi type locality, and compared this material with confirmed museum specimens and material from Louisiana, the type locality of A. dorsalis. Our observations with light microscopy and SEM allowed us to state that A. dampfi is in fact a synonym of A. dorsalis and should be excluded from regional lists. This was concluded after examination and comparison of the taxonomically relevant structures in both groups of specimens. Differences between both groups of specimens were slight. We found significative size differences between the Guatemalan population and the other neotropical and nearctic ones, the former being the smallest sized populations known throughout the known distributional range of A. dorsalis.

  5. Diversity of planktonic Ostracods (Crustacea: Ostracoda in the mixed layer of northeastern Arabian Sea during the summer monsoon

    Directory of Open Access Journals (Sweden)

    Jasmine Purushothaman

    2015-03-01

    Full Text Available Planktonic ostracods contribute significantly to the biomass of zooplankton in the Arabian Sea with an unusually high density due to swarming.  However, due to the small size, their abundance is often underestimated.  In this paper, the diversity of planktonic ostracods in the mixed layer depth of the northeastern Arabian Sea in relation to environmental parameters during the summer monsoon is presented.  The mean abundance in the mixed layer depth was very high.  About 26 species belonging to 17 genera representing two families were recognized.  Out of this, 25 species belonged to (3 sub families, 16 genera the order Myodocopa and one to the order Myodocopida.  The dominant species were Cypridina dentata, Euconchoecia aculeata, Conchoecia subarcuata and Orthoconchoecia atlantica.  Cypridina dentata and Euconchoecia aculeata contributed to about 89% of the total abundance.  The results suggest that the distribution and diversity of ostracods were very much influenced by the hydrographic conditions of the Arabian Sea during the summer monsoon. 

  6. Population structure and reproductive biology of Mesopodopsis orientalis (Crustacea: Mysida) in a tropical mangrove ecosystem in India

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A; Panampunnayil, S.U.

    ). The sampled population was found in a wide range of temperature (25.5 degree celsius to 34 degree celsius) and salinities (20.3 to 37.1). Carapace length significantly correlated with total body length (P < 0.01). Mesopodopsis orientalis breed throughout...

  7. Mysids (Crustacea) from the shallow waters off Maharashtra and south Gujarat, India, with description of a new species

    Digital Repository Service at National Institute of Oceanography (India)

    Abraham, B.; Panampunnayil, S.U.

    , S. jonesi, Rhopalophthalmus mumbayensis, R. anishi, R. murudana, R. vijayai, Gastrosaccus dunckeri, Eurobowmaniella muticus, Afromysis dentisinus, Acanthomysis pelagica, A. platycauda, A. macrops and Mesopodopsis orientalis, and the differences shown...

  8. Distribution, reproductive biology and biochemical composition of Rhopalophthalmus indicus (Crustacea: Mysida) from a tropical estuary (Cochin backwater) in India

    Digital Repository Service at National Institute of Oceanography (India)

    Biju, A; Gireesh, R.; Panampunnayil, S.U.

    males and females attain sexual maturity at a length of 8.4 mm. Seasonality is observed in biochemical composition, as mature males and females had higher protein contents, immature stages contained high carbohydrate content and brooding females...

  9. Amsterdam Expeditions to the West Indian Islands, Report 37. The genus Tanycypris (Crustacea, Ostracoda) in the West Indies

    NARCIS (Netherlands)

    Broodbakker, Nico W.

    1984-01-01

    A list of species that are, or probably have to be, assigned to the genus Tanycypris is given. A redescription is given of T. meridana (Furtos, 1936), a species originally described as Herpetocypris, from Yucatan (Mexico). This species was also found in Puerto Rico, two of the Lesser Antilles and tw

  10. Lista anotada de los isópodos acuáticos epicontinentales de México (Crustacea: Isopoda)

    OpenAIRE

    Arturo Rocha-Ramírez; Fernando Álvarez; Javier Alcocer; Rafael Chávez-López; Elva Escobar-Briones

    2009-01-01

    El presente trabajo integra una lista de especies de crustáceos isópodos acuáticos continentales de México con referencias taxonómicas originales, sinonimias, localidades tipo y distribución. El listado comprende un total 6 familias que agrupan 49 especies, de las cuales sólo 10 son epigeas, mientras que las 39 restantes son hipogeas registradas en manantiales termales y cuevas de los sectores oriental y centro del país, así como en cenotes de los estados de Yucatán y Quintana Roo. Los grupos...

  11. Cytochemical characterization of gill and hepatopancreatic cells of the crab Ucides cordatus (Crustacea, Brachyura validated by cell metal transport

    Directory of Open Access Journals (Sweden)

    Priscila Ortega

    2014-09-01

    Full Text Available Ucides cordatus (Linnaeus, 1763 is a hypo-hyper-regulating mangrove crab possessing gills for respiratory and osmoregulatory processes, separated in anterior and posterior sections. They also have hepatopancreas, which is responsible for digestion and absorption of nutrients and detoxification of toxic metals. Each of these organs has specific cells that are important for in vitro studies in cell biology, ion and toxic metals transport. In order to study and characterize cells from gills and hepatopancreas, both were separated using a Sucrose Gradient (SG from 10 to 40% and cells in each gradient were characterized using the vital mitochondrial dye DASPEI (2-(4-dimethylaminostyryl-N- ethylpyridinium iodide and Trichrome Mallory's stain. Both in 20 and 40% SG for gill cells and 30% SG for hepatopancreatic cells, a greater number of cells were colored with DASPEI, indicating a larger number of mitochondria in these cells. It is concluded that the gill cells present in 20% and 40% SG are Thin cells, responsible for respiratory processes and Ionocytes responsible for ion transport, respectively. For hepatopancreatic cells, the 30% SG is composed of Fibrillar cells that possess larger number of membrane ion and nutrient transporters. Moreover, the transport of toxic metal cadmium (Cd by isolated hepatopancreatic cells was performed as a way of following cell physiological integrity after cell separation and to study differences in transport among the cells. All hepatopancreatic cells were able to transport Cd. These findings are the first step for further work on isolated cells of these important exchange epithelia of crabs, using a simple separation method and to further develop successful in vitro cell culture in crabs.

  12. 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.

  13. Phylogenetic relationships among the freshwater genera of palaemonid shrimps (Crustacea: Decapoda from Mexico: evidence of multiple invasions?

    Directory of Open Access Journals (Sweden)

    Alejandro Botello

    2013-09-01

    Full Text Available Palaemonid shrimps form a large and diversified group distributed primarily in marine waters. Within the family Palaemonidae the subfamily Palaemoninae is composed of 26 genera and more than 370 species inhabiting marine and fresh waters in epigean and hypogean habitats. One of the relevant questions that have emerged in relation to the subfamily is how the invasion to freshwater has occurred in Mexico, where six freshwater genera belonging to the Palaemoninae (Creaseria, Cryphiops, Macrobrachium, Palaemonetes, Neopalaemon and Troglomexicanus, are present. The purpose of this study was to explore the relationships among these freshwater lineages through a phylogenetic analysis based on partial sequences of the 16S mitochondrial gene to elucidate if these genera are closely related and derived from a common ancestor or if each lineage has invaded the freshwater habitat independently. The analysis included species representing monotypic and diversified genera, from epigean and hypogean habitats and with complete and abbreviated larval development. The results suggest that the invasion of freshwater occurred on four different occasions and that the different lineages originated before the invasions of freshwater occurred.

  14. Evaluation of Costa Rican copepods (Crustacea: Eudecapoda) for larval Aedes aegypti control with special reference to Mesocyclops thermocyclopoides.

    Science.gov (United States)

    Schaper, S

    1999-12-01

    This study attempted to find organisms for the biological control of the mosquito Aedes aegypti in Costa Rica. Copepods of the genera Arctodiaptomus, Eucylops, Mesocyclops, Megacyclops, and Thermocyclops were collected in several parts of the country and cultured for laboratory evaluations. Mesocyclops thermocyclopoides was the most successful species in reducing the number of larval Ae. aegypti (7.3 larvae in 24 h at a density of 200 Aedes/liter). Arctodiaptomus dorsalis, Eucyclops cf. bondi, Eucyclops leptacanthus, Megacyclops sp., and Thermocyclops decipens were not effective predators. In cage simulation trials, M. thermocyclopoides showed 100% larval reduction after 4 wk and adult mosquitoes disappeared after 7 wk. The copepod was able to survive in Aechmea sp. bromeliads under laboratory conditions. In field trials under 3 different climatic conditions M. thermocyclopoides survived 2-5 months in bromeliad leaf axils and 3-6 months in used car tires. In tires, this species reduced the number of larval Ae. aegypti 79, 90, and 99% in tropical dry, moderate, and humid climates, respectively. An El Niño phenomenon affected the results by drought, which apparently also caused a decline in the population of the predatory mosquito Toxorhynchites haemorrhoidalis superbus. Considering these severe test conditions, M. thermocyclopoides might be a promising predator for mosquito control in Costa Rica. PMID:10612615

  15. Breeding period of the spider crab Mithraculus forceps (A. Milne Edwards (Crustacea, Majidae, Mithracinaein the southeastern Brazilian coast

    Directory of Open Access Journals (Sweden)

    Valter José Cobo

    2002-07-01

    Full Text Available Investigations concerning to the breeding period of brachyuran crabs provide fundamental information to determine their reproductive cycle, and also to establish management plans for species mainly in protected areas. This study provides data on the breeding period of M.forceps (A. Milne Edwards, 1875 in the southeastern Brazilian coast. Monthly samplings were carried out during a one year-round. A catch effort of approximately four hours was allocated to each monthly survey. The breeding intensity was determined based on the percentage of ovigerous crabs within the whole adult female population. A total of 137 adult females was obtained, from which 80.3% presented eggs attached on their pleopods. Ovigerous females were observed yearround, usually comprising more than 60% of sampled adult females. The ovigerous frequency was not statistically correlated to the environmental analyzed factors.

  16. DNA barcoding reveals new insights into the diversity of Antarctic species of Orchomene sensu lato (Crustacea: Amphipoda: Lysianassoidea)

    Science.gov (United States)

    Havermans, C.; Nagy, Z. T.; Sonet, G.; De Broyer, C.; Martin, P.

    2011-03-01

    Recent molecular analyses revealed that several so-called "circum-Antarctic" benthic crustacean species appeared to be complexes of cryptic species with restricted distributions. In this study we used a DNA barcoding approach based on mitochondrial cytochrome oxidase I gene sequences in order to detect possible cryptic diversity and to test the circumpolarity of some lysianassoid species. The orchomenid genus complex consists of the genera Abyssorchomene, Falklandia, Orchomenella, Orchomenyx and Pseudorchomene. Species of this genus complex are found throughout the Southern Ocean and show a high species richness and level of endemism. In the majority of the studied species, a genetic homogeneity was found even among specimens from remote sampling sites, which indicates a possible circum-Antarctic and eurybathic distribution. In four investigated species ( Orchomenella ( Orchomenopsis) acanthurus, Orchomenella ( Orchomenopsis) cavimanus, Orchomenella ( Orchomenella) franklini and Orchomenella ( Orchomenella) pinguides), genetically divergent lineages and possible cryptic taxa were revealed. After a detailed morphological analysis, O. ( O.) pinguides appeared to be composed of two distinct species, formerly synonymized under O. ( O.) pinguides. The different genetic patterns observed in these orchomenid species might be explained by the evolutionary histories undergone by these species and by their different dispersal and gene flow capacities.

  17. Joeropsididae Nordenstam, 1933 (Crustacea, Isopoda, Asellota from the Lizard Island region of the Great Barrier Reef, Queensland, Australia

    Directory of Open Access Journals (Sweden)

    Niel L. Bruce

    2015-03-01

    Full Text Available The marine isopod family Joeropsididae (Asellota is documented for the Lizard Island region of the Great Barrier Reef, Australia. Fifteen species of Joeropsis are recorded, including ten new species; descriptive notes are provided for five species that lacked adequate material for description. A revised family and genus diagnosis is presented together with comments on the most useful characters for species identification and a key to Joeropsis of the Lizard Island region.

  18. Cypris metamorphosis, injection and earliest internal development of theRrizocephalan Loxothylacus panopaei (Gissler). Crustacea: Cirripedia: Rhizocephala: Sacculinidae

    DEFF Research Database (Denmark)

    Glenner, H

    2001-01-01

    substratum and initiate metamorphosis. In the presumed sister group to Rhizocephala, the true barnacles or Thoracica, metamorphosis leads to a juvenile filter-feeding version of the adult organism. In Rhizocephala the female cyprid settles on the integument of a crustacean and undergoes metamorphosis into a...

  19. Pontonides sympathes, a new species of commensal shrimp (Crustacea, Decapoda, Pontoniinae) from Antipatharia in the Galapagos Islands

    NARCIS (Netherlands)

    Ridder, de Ch.; Holthuis, L.B.

    1979-01-01

    During a stay at the Galapagos Islands (1975-1976), one of us (Ch. de Ridder) made a study of Gorgonaria and Antipatharia, paying special attention to commensals found with these corals. On Antipathes galapagensis Deichmann, 1941, a species of the pontoniine shrimp genus Pontonides was observed, whi

  20. Morphology and ecology of Daphnia middendorffiana, Fisher 1851 (Crustacea, Daphniidae from four new populations in the Alps

    Directory of Open Access Journals (Sweden)

    Rocco TIBERTI

    2011-08-01

    Full Text Available Daphnia middendorffiana has an arctic, circumpolar distribution, with some isolated southerly populations restricted to mountainous areas, including the Alps. In this paper, new records of Daphnia middendorffiana on the Alps are reported. The species was regularly recorded in several samples collected from 2006 to 2009 in four high altitude lakes in the Gran Paradiso National Park (GPNP during the ice free period. This is the third finding for the Alps and the described populations are the largest. Chemical and morphometric features of the lakes are provided, the morphology of the Daphnia middendorffiana from GPNP is described as well as some aspects concerning its ecology. The studied lakes are small, oligotrophic (total phosphorus ranged from 0 to 7 μg L-1 and well preserved from acidification risk (pH ranged from 6.45 to 8.14. D. middendorffiana is the largest zooplanktonic crustacean inhabiting the Alpine lakes in GPNP reaching 3.43 mm in length; the morphological analysis noted some differences within the studied populations; however there is a clear resemblance to the only Alpine population previously described (from Central Alps, Bognanco Valley, Lake Campo IV and to the arctic populations. D. middendorffiana in GPNP lives at low density levels, reaching higher densities in late August and early September. No males have been found during the sample campaign confirming its ability to produce asexual viable diapauses eggs. This study confirms the attitude of this species for cold and oligotrophic waters and increases the current knowledge on the geographical distribution, morphology and ecology of this species in Alpine environments. The finding of D. middendordorffiana in the GPNP poses interesting issues concerning the phylogeography of Alpine Daphnia middendorffiana, as well as raising need for conservation efforts aimed at keeping the populations safe from several global and local threats, such as climate warming and the ecological impact of alien species.

  1. 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.

  2. Bioensayos preliminares para evaluar la toxicidad del lindano sobre Simocephalus vetulus (O.F.Muller, 1776) (Crustacea: Cladocera)

    OpenAIRE

    Jorgelina Juárez; Alcira Villagra de Gamundi

    2013-01-01

    El lindano es conocido por su toxicidad y su capacidad de bioacumulación en los seres vivos, convirtiéndose en un compuesto peligroso para la salud humana y el ambiente. El objetivo del presente trabajo fue evaluar la toxicidad aguda del lindano sobre el cladócero Simocephalus vetulus . Se realizaron cultivos en cámara de incubación en condiciones controladas con medios diferenciales (algas e infusorios). Los bioensayos se implementaron con un control, 5 diluciones y 3 réplicas. El valor de C...

  3. Bioensayos preliminares para evaluar la toxicidad del lindano sobre Simocephalus vetulus (O.F.Muller, 1776 (Crustacea: Cladocera

    Directory of Open Access Journals (Sweden)

    Jorgelina Juárez

    2013-04-01

    Full Text Available El lindano es conocido por su toxicidad y su capacidad de bioacumulación en los seres vivos, convirtiéndose en un compuesto peligroso para la salud humana y el ambiente. El objetivo del presente trabajo fue evaluar la toxicidad aguda del lindano sobre el cladócero Simocephalus vetulus . Se realizaron cultivos en cámara de incubación en condiciones controladas con medios diferenciales (algas e infusorios. Los bioensayos se implementaron con un control, 5 diluciones y 3 réplicas. El valor de CL50 a 48 horas de exposición frente a las distintas concentraciones de lindano fue de 11.4 μg/l, lo que refl eja la mayor sensibilidad del organismo prueba en relación a otros antecedentes.

  4. Dinámica temporal en la relación entre el isópodo parásito Aporobopyrus curtatus (Crustacea: Isopoda: Bopyridae y el cangrejo anomuro Petrolisthes armatus (Crustacea: Decapoda: Porcellanidae en el sur de Brasil Temporal dynamic of the relationship between the parasitic isopod Aporobopyrus curtatus (Crustacea: Isopoda: Bopyridae and the anomuran crab Petrolisthes armatus (Crustacea: Decapoda: Porcellanidae in southern Brazil

    Directory of Open Access Journals (Sweden)

    Ivana Miranda

    2010-01-01

    Full Text Available The prevalence of the parasite Aporobopyrus curtatus in Petrolisthes armatus from southern Brazil was determined, and the effect the parasite had on host reproduction was evaluated. Of all 775 crabs sampled in Araçá region from March 2005 to July 2006, 3.2% presented bopyrid parasites. All the parasitized individuals had one branchial chamber occupied by two mature parasites, with no preference for the right or left chamber. Male and female hosts were infested in equal proportions. Parasitized juveniles, large individuals and ovigerous females were not found in our study. The absence of parasitized ovigerous females seems to be insufficient evidence to support the hypothesis of parasitic castration and would require a histological study to confirm their reproductive death. The percentage of infestation observed in our study (3.1% is lower than the one found in other studies and it could indicate the existence of factor(s regulating the density of A. curtatus in the Araçá region. At least in this population, the low but constant presence of the bopyrid A. curtatus population did not appear to have a negative effect on the porcellanid population, and parasitized individuals did not play a significant role in the natural history of P. armatus.Se determinó la prevalencia del parásito Aporobopyrus curtatus en Petrolisthes armatus en el sur de Brasil y se evaluó el efecto de su presencia en la reproducción de su huésped. De marzo de 2005 a julio de 2007 se muestreó en la Región de Araçá un total de 775 cangrejos, de los cuales el 3,2% presentó bopíridos parásitos. Todos los individuos parasitados presentaron una cámara branquial ocupada por dos parásitos maduros, sin preferencia por la cámara derecha o izquierda. Machos y hembras hospedadores fueron infectados en la misma proporción. La ausencia de parásitos en hembras ovígeras no es evidencia suficiente para apoyar la hipótesis de castración parasítica, y se necesita un estudio histológico para confirmar la muerte reproductiva. El porcentaje de infectación observado (3,1% es inferior al encontrado en otros estudios y puede ser indicativo de la existencia de factor(es que regulan la densidad de A. curtatus en la región de Araçá. En conclusion, estos resultados sugieren que, al menos en esta población, la baja y constante incidencia del bopírido A. curtatus parece no afectar la población del porcelánido, y los individuos parasitados no tienen un papel significativo en la historia natural de P. armatus.

  5. Prediction of the neuropeptidomes of members of the Astacidea (Crustacea, Decapoda) using publicly accessible transcriptome shotgun assembly (TSA) sequence data.

    Science.gov (United States)

    Christie, Andrew E; Chi, Megan

    2015-12-01

    The decapod infraorder Astacidea is comprised of clawed lobsters and freshwater crayfish. Due to their economic importance and their use as models for investigating neurochemical signaling, much work has focused on elucidating their neurochemistry, particularly their peptidergic systems. Interestingly, no astacidean has been the subject of large-scale peptidomic analysis via in silico transcriptome mining, this despite growing transcriptomic resources for members of this taxon. Here, the publicly accessible astacidean transcriptome shotgun assembly data were mined for putative peptide-encoding transcripts; these sequences were used to predict the structures of mature neuropeptides. One hundred seventy-six distinct peptides were predicted for Procambarus clarkii, including isoforms of adipokinetic hormone-corazonin-like peptide (ACP), allatostatin A (AST-A), allatostatin B, allatostatin C (AST-C) bursicon α, bursicon β, CCHamide, crustacean hyperglycemic hormone (CHH)/ion transport peptide (ITP), diuretic hormone 31 (DH31), eclosion hormone (EH), FMRFamide-like peptide, GSEFLamide, intocin, leucokinin, neuroparsin, neuropeptide F, pigment dispersing hormone, pyrokinin, RYamide, short neuropeptide F (sNPF), SIFamide, sulfakinin and tachykinin-related peptide (TRP). Forty-six distinct peptides, including isoforms of AST-A, AST-C, bursicon α, CCHamide, CHH/ITP, DH31, EH, intocin, myosuppressin, neuroparsin, red pigment concentrating hormone, sNPF and TRP, were predicted for Pontastacus leptodactylus, with a bursicon β and a neuroparsin predicted for Cherax quadricarinatus. The identification of ACP is the first from a decapod, while the predictions of CCHamide, EH, GSEFLamide, intocin, neuroparsin and RYamide are firsts for the Astacidea. Collectively, these data greatly expand the catalog of known astacidean neuropeptides and provide a foundation for functional studies of peptidergic signaling in members of this decapod infraorder. PMID:26070255

  6. Crustacea decapoda : studies of the Plesionika narval (Fabricius, 1787) group (Pandalidae) with description of six new species

    OpenAIRE

    Crosnier, Alain; Chan, T. Y.

    1991-01-01

    A partir de récoltes faites par l'ORSTOM (Institut de Recherche Scientifique pour le Développement en Coopération), le Service Mixte de Contrôle Biologique des Armées (SMCR) et la National Taïwan Ocean University dans d'Indo-Ouest Pacifique (à Madagascar, aux Seychelles, à Taïwan, aux Philippines, en Indonésie, aux îles Chesterfield, en Nouvelle Calédonie et en Polynésie) et des prêts de divers Museums, une révision des #Plesionika$ du groupe #narval$ est tentée. (D'après résumé d'auteur)...

  7. Notes on the ultrastructure of the setae on the fourth antennulary segment of the Balanus amphitrite cyprid (Crustacea : Cirripedia : Thoracica)

    DEFF Research Database (Denmark)

    Lagersson, Niklas; Garm, Anders Lydik; Høeg, Jens Thorvald

    2003-01-01

    This study presents electron microscopy (SEM, TEM) observations on the putative settlement receptors of the fourth antennulary segments. The TEM data from all nine setae are from the outer dendritic segment. Eight of them have morphological characteristics, indicating bimodal sensory properties...

  8. Allocation of the Mantridae Leigh-Sharpe to the Cyclopoida (Crustacea: Copepoda) with notes on Nearchinotodelphys Ummerkutty

    OpenAIRE

    Huys,Rony

    1990-01-01

    Mantra speciosa Leigh-Sharpe, 1934 (ex Poecilostomatoida), collected during the Siboga Expedition is redescribed on the basis of the holotype female. The 15-segmented antennule and the gnathostomous nature of the mouthparts exclude the Mantridae from the Poecilostomatoida and point to a relationship with the tunicate-infesting families Ascidicolidae, Notodelphyidae and Archinotodelphyidae (Cyclopoida). Nearchinotodelphys indicus Ummerkutty, 1960 (ex Archinotodelphyidae) is transferred to the ...

  9. Small is beautiful: diversity of freshwater ostracods (Crustacea, Ostracoda in marginal habitats of the province of Parma (Northern Italy

    Directory of Open Access Journals (Sweden)

    Stefano TAVERNELLI

    2006-08-01

    Full Text Available A study on the distribution of ostracods in small freshwater habitats of the province of Parma was conducted from May 2004 to December 2005. Vernal pools, ponds, shallow lakes, fountains, springs, ditches, canals, and streams were among the most common types of aquatic systems included in this survey. Altogether, 90 sites located between 24 and 1557 m a.s.l. were visited, and 125 samples were collected. 41 samples did not contain ostracods, and 7 samples were not considered because only immature specimens or empty valves were found. Consequently, 77 samples from 58 sites were analysed. Whenever possible, ostracod identification was done at the species level based on the morphology of both valves and limbs. Thirty-eight taxa from 20 genera belonging to the families Candonidae, Ilyocyprididae, Cyprididae, and Notodromadidae were recorded. This roughly accounts for one-third of the estimated number of non-marine ostracod species in Italy. Scanning electron microscopy images of valves are provided. The maximum number of species per site was six. The most frequent species were Heterocypris incongruens, Eucypris virens, Pseudocandona pratensis, Cypria ophthalmica, and Tonnacypris lutaria. Of particular relevance is the occurrence of species with a limited known distribution in Italy, viz. Ilyocypris monstrifica, Potamocypris villosa, Candona cf. lindneri, Fabaeformiscandona breuili and Physocypria kraepelini. A putative new species of the genus Candona, here left in open nomenclature, is also reported. Our results highlight the importance of so-called "marginal" aquatic habitats as potential biodiversity hotspots, in spite of the general lack of interest shown by freshwater ecologists and taxonomists in undertaking scientific investigations in these environments.

  10. Morphology and ecology of Daphnia middendorffiana, Fisher 1851 (Crustacea, Daphniidae) from four new populations in the Alps

    OpenAIRE

    Tiberti, Rocco

    2011-01-01

    Daphnia middendorffiana has an arctic, circumpolar distribution, with some isolated southerly populations restricted to mountainous areas, including the Alps. In this paper, new records of Daphnia middendorffiana on the Alps are reported. The species was regularly recorded in several samples collected from 2006 to 2009 in four high altitude lakes in the Gran Paradiso National Park (GPNP) during the ice free period. This is the third finding for the Alps and the described populations are the l...

  11. On the Bennelongia nimala and B. triangulata lineages (Crustacea, Ostracoda in Western Australia, with the description of six new species

    Directory of Open Access Journals (Sweden)

    Koen Martens

    2015-02-01

    Full Text Available The ostracod genus Bennelongia De Deckker & McKenzie, 1981 occurs in Australia and New Zealand. We redescribe B. nimala from the Northern Territory and describe six new species from Western Australia belonging to the B. nimala (five species and B. triangulata sp. nov. (one species lineages: B. tirigie sp. nov., B. koendersae sp. nov., B. pinderi sp. nov., B. muggon sp. nov., B. shieli sp. nov. and B. triangulata sp. nov. For six of these seven species, we could construct molecular phylogenies and parsimonious networks based on COI sequences. We tested for specific status and for potential cryptic diversity of clades with Birky’s 4 theta rule. The analyses support the existence of these six species and the absence of cryptic species in these lineages. Bennelongia triangulata sp. nov. is a common species in the turbid claypans of the Murchison/ Gascoyne region. Bennelongia nimala itself is thus far known only from the Northern Territory. Bennelongia tirigie sp. nov., B. pinderi sp. nov. and B. muggon sp. nov. occur in the Murchison/ Gascoyne region, whereas B. koendersae sp. nov. and B. shieli sp. nov. are described from the Pilbara. With the six new species described here, the genus Bennelongia now comprises 31 nominal species.

  12. A new species of Cletocamptus Schmankewitsch, 1875 (Crustacea, Copepoda, Harpacticoida from a high altitude saline lake in Central Mexico

    Directory of Open Access Journals (Sweden)

    Eduardo Suarez Morales

    2013-04-01

    Full Text Available During the analysis of littoral samples collected from a high-altitude saline crater lake in Central Mexico, several female and male specimens of harpacticoid copepods were recovered and taxonomically examined. They were found to represent an undescribed species of the canthocamptid genus Cletocamptus Schmankewitsch, 1875. The new species, C. gomezi n. sp. is described herein based on specimens of both sexes. It resembles C. stimpsoni Gómez, Fleeger, Rocha-Olivares and Foltz, 2004 from Louisiana but also C. trichotus Kiefer, 1929. The new species differs from C. stimpsoni and from other congeners by details of the maxillular armature, the setation of the endopodal segments of legs 2 and 3, and the armature of the third exopodal segment of legs 3 and 4. Also, the dorsal (VII and the outer (IV caudal setae are both relatively shorter than in C. stimpsoni. This is the second species of the genus known to be distributed in Mexico. The occurrence of the new species in a high-altitude saline lake, the isolation of the type locality, and its absence from adjacent freshwater lakes suggest that this species is endemic to this site.

  13. A new species of Cletocamptus Schmankewitsch, 1875 (Crustacea, Copepoda, Harpacticoida) from a high altitude saline lake in Central Mexico

    OpenAIRE

    Eduardo Suarez Morales; Omar Barrera-Moreno; Jorge Ciros-Pérez

    2013-01-01

    During the analysis of littoral samples collected from a high-altitude saline crater lake in Central Mexico, several female and male specimens of harpacticoid copepods were recovered and taxonomically examined. They were found to represent an undescribed species of the canthocamptid genus Cletocamptus Schmankewitsch, 1875. The new species, C. gomezi n. sp. is described herein based on specimens of both sexes. It resembles C. stimpsoni Gómez, Fleeger, Rocha-Olivares and Foltz, 2004 from Louisi...

  14. Unique 16S rRNA sequences of Eurythenes gryllus (Crustacea: Amphipoda: Lysianassidae) from the Gulf of Mexico abyssal plain

    OpenAIRE

    Elva Escobar-Briones; Eduardo Nájera-Hillman; Fernando Álvarez

    2010-01-01

    Amphipods of the species Eurythenes gryllus were collected at 2 locations on the abyssal plain (~3 400 m) of the Gulf of Mexico in order to test whether or not these scavenger amphipods are isolated in this peripheral sea or show connectivity by their predominant swimming behavior, moving horizontally along the abyssal water masses in the region. Partial sequences of the mitochondrial 16S rRNA gene from 2 individuals of E. gryllus were determined and showed small differences when compared to ...

  15. Three new species and one new genus of abyssal Cumacea (Crustacea, Malacostraca, Peracarida) from the Kuril-Kamchatka Trench area

    Science.gov (United States)

    Lavrenteva, Anna V.; Mühlenhardt-Siegel, Ute

    2015-01-01

    Only two species of crustacean Cumacea have been reported in publications for the Kuril-Kamchatka Trench area after nine expeditions on board of the RV "Vityaz". During the KuramBio expedition 2012 to the Kuril-Kamchatka Trench and the adjacent abyssal plain at depths 4830-5780 m no less than 72 species of cumaceans from 23 genera and 6 families were sampled. Five genera were recorded for the first time in the studied region: the genera Pseudoleptostyloides and Platycuma were detected for the first time for the Pacific Ocean; Cyclaspoides, Bathylamprops and Styloptocuma were firstly sampled in North Pacific. About 90% of the sampled species appear to be new to science. Three new deep-sea cumacean species and one new genus from the Kurile Kamchatka area are described in the present paper: Abyssoleucon tzarevae gen. n., sp. n. belonging to the family Leuconidae, Cyclaspoides borisovetsi sp. n. and Bathycuma sonne sp. n. of the family Bodotriidae. A distribution map for the species of the genus Cyclaspoides is provided.

  16. Submarine ridges do not prevent large-scale dispersal of abyssal fauna: A case study of Mesocletodes (Crustacea, Copepoda, Harpacticoida)

    Science.gov (United States)

    Menzel, Lena; George, Kai Horst; Arbizu, Pedro Martínez

    2011-08-01

    We examined the large-scale distribution of deep-sea harpacticoid copepods at the species level, in order to clarify the underlying processes of copepod dispersal. The study was based on samples collected from 12 regions and a total of 113 stations: 57 stations at depths between 1107 and 5655 m on abyssal plains in the South and North Atlantic, Southern Ocean, southern Indian Ocean, and the Pacific Ocean, and 56 stations above 900 m in the North Atlantic and eastern Mediterranean Sea. We chose the genus Mesocletodes Sars, 1909 as an ideal group to study the large-scale distribution of harpacticoid copepods in the deep oceans. Clear apomorphies and a comparatively large body size of about 1 mm allow rapid recognition of allied species in meiofauna samples. In addition, Mesocletodes represents more than 50% of the family Argestidae Por, 1986, one of the most abundant harpacticoid families in the deep sea. The geographical distributions of 793 adult females of Mesocletodes belonging to 61 species throughout the South and North Atlantic, Southern Ocean, southern Indian Ocean, Pacific Ocean, and eastern Mediterranean Sea indicated that most species are cosmopolitan. Neither the topography of the sea bottom nor long distances seem to prevent species from dispersing. Passive transport by bottom currents after resuspension is likely the propulsive factor for the dispersal of Harpacticoida, while plate tectonics and movement of individuals in the sediment may play relatively minor roles.

  17. Promjene pokazatelja krvne slike hibridnih riba tambacu invadiranih ribljom uši Dolops carvalhoi (Crustacea, Branchiura).

    OpenAIRE

    Tavares-Dias, Marcos; Ruas de Moraes, Flávio; Onaka, Eduardo Makoto; Rezende, Paula Cristina Bonadio

    2007-01-01

    Poznato je da se mjerenje vrijednosti različitih pokazatelja u krvi riba upotrebljava za praćenje njihova zdravlja. U ovom istraživanju promatran je učinak prirodne invazije ribljom uši Dolops carvalhoi, Lemos de Castro, 1949., na broj eritrocita, trombocita, leukocita te na razinu glukoze u plazmi i elektrolita u serumu u hibridne ribe tambacu (Piaractus mesopotamicus x Colossoma macropomum). U invadiranih riba zabilježene su niže vrijednosti hematokrita i magnezija te povećane vrijednosti s...

  18. Redescription of Gammarus pseudosyriacus (Karaman & Pinkster, 1977) and description of a new subspecies from southern Iran (Crustacea, Amphipoda, Gammaridae)

    OpenAIRE

    Semsar-kazerooni,Maryam; Zamanpoore, Mehrdad; Sadeghi, Saber

    2016-01-01

    The present study focused on redescription of Gammarus pseudosyriacus (Karaman & Pinkster, 1977) based on new materials from Zagros Mountains and describes a new subspecies of freshwater amphipod, Gammarus pseudosyriacus issatisi subsp. n., from the southern Zagros Mountains. The work is based on morphological and morphometric comparisons. This new subspecies has features similar to Gammarus pseudosyriacus. The distinct features that distinguish Gammarus pseudosyriacus issatisi subsp. n. ...

  19. Mitochondrial genome rearrangements at low taxonomic levels: three distinct mitogenome gene orders in the genus Pseudoniphargus (Crustacea: Amphipoda).

    Science.gov (United States)

    Stokkan, Morten; Jurado-Rivera, Jose A; Juan, Carlos; Jaume, Damià; Pons, Joan

    2016-09-01

    A comparison of mitochondrial genomes of three species of the amphipod Pseudoniphargus revealed the occurrence of a surprisingly high level of gene rearrangement involving protein-coding genes that is a rare phenomenon at low taxonomic levels. The three Pseudoniphargus mitogenomes also display a unique gene arrangement with respect to either the presumed Pancrustacean order or those known for other amphipods. Relative long non-coding sequences appear adjacent to the putative breakage points involved in gene rearrangements of protein coding genes. Other details of the newly obtained mitochondrial genomes - e.g., gene content, nucleotide composition and codon usage - are similar to those found in the mitogenomes of other amphipod species studied. They all contain the typical mitochondrial genome set consisting of 13 protein-coding genes, 22 tRNAs, and two rRNAS, as well as a large control region. The secondary structures and characteristics of tRNA and ribosomal mitochondrial genes of these three species are also discussed. PMID:26329687

  20. Corophiine amphipods of the genera Chelicorophium and Paracorophium from the lower Gulf of Thailand (Crustacea, Amphipoda, Corophiidae, Corophiinae

    Directory of Open Access Journals (Sweden)

    Koraon Wongkamhaeng

    2015-05-01

    Full Text Available Two species of corophiine amphipods from Songkhla Lake, in the lower Gulf of Thailand, are described and illustrated. Chelicorophium madrasensis (Nayar, 1950, found in the mangrove forest, has not previously been observed in Thai waters. Paracorophium angsupanichae sp. n. is characterized by its chelate male gnathopod 2, obtuse palm with subrectangular distomedial elevation, and urosomites 1-3 free. This is the first record of the genus Chelicorophium and Paracorophium in Thai waters. All specimens are deposited in the Princess Maha Chakri Sirindhorn Natural History Museum, Prince of Songkla University, Thailand and the Museum für Naturkunde, Berlin.

  1. Corophiine amphipods of the genera Chelicorophium and Paracorophium from the lower Gulf of Thailand (Crustacea, Amphipoda, Corophiidae, Corophiinae)

    Science.gov (United States)

    Wongkamhaeng, Koraon; Nabhitabhata, Jaruwat; Towatana, Prawit

    2015-01-01

    Abstract Two species of corophiine amphipods from Songkhla Lake, in the lower Gulf of Thailand, are described and illustrated. Chelicorophium madrasensis (Nayar, 1950), found in the mangrove forest, has not previously been observed in Thai waters. Paracorophium angsupanichae sp. n. is characterized by its chelate male gnathopod 2, obtuse palm with subrectangular distomedial elevation, and urosomites 1-3 free. This is the first record of the genus Chelicorophium and Paracorophium in Thai waters. All specimens are deposited in the Princess Maha Chakri Sirindhorn Natural History Museum, Prince of Songkla University, Thailand and the Museum für Naturkunde, Berlin. PMID:26052237

  2. A new species of Fizesereneia Takeda & Tamura, 1980 (Crustacea: Brachyura: Cryptochiridae) from the Red Sea and Oman

    KAUST Repository

    Van Der Meij, Sancia E T

    2015-03-16

    A new species of cryptochirid crab, Fizesereneia panda van der Meij, is described and illustrated based on specimens collected from the scleractinian corals Lobophyllia cf. hemprichii and L. cf. corymbosa from the Farasan Banks, Farasan Islands, and the reefs off Thuwal in the Saudi Arabian Red Sea, and from Symphyllia recta from reefs in the Gulf of Oman. This is the second cryptochirid species with the Red Sea as type locality. It can be separated from its congeners by the subrectangular carapace, raised midline and the complete division of the carapace depressions, and reddish black colour pattern of these concavities in live specimens. This new species is the seventh assigned to Fizesereneia. A DNA barcode for the new species has been deposited in GenBank. Copyright © 2015 Magnolia Press.

  3. On the trophic ecology of Gammaridea (Crustacea: Amphipoda) in coastal waters: A European-scale analysis of stable isotopes data

    Science.gov (United States)

    Mancinelli, Giorgio

    2012-12-01

    Gammaridean amphipods are found throughout a diverse range of coastal and brackish environments and are generally considered macrophagous herbivores/detritivores. While predation and cannibalism have been shown to be common in freshwater species, motivating a revision of the group functional role, only qualitative information is available on marine Gammaridea. In this study, a survey was conducted of the available literature on stable C and N isotopic signatures of macrophagous, fully aquatic Gammaridea and their potential basal resources in European brackish and coastal environments. The contribution of intra- and inter-specific predation to the signatures of gammarideans was verified by a mixing model procedure where the diet-tissue enrichment constant was not set a priori. Specifically, for each study included in the survey the minimum and maximum diet-tissue nitrogen enrichment factors (Δ15Nmin and Δ15Nmax) providing a non-zero solution were calculated for a range of carbon enrichment factors, assuming that both metrics would increasingly differ from the values expected for a single trophic level as predation and/or cannibalism increased in the diet of the consumer. The minimum enrichment factors Δ15Nmin estimated for a Δ13C of -2.6‰ and +0.5‰ were found to be independent from resource-related artefacts and provided the highest number of successful model runs. Δ15Nmin values were consistent with a diet based on living or decaying primary producers and not compatible with cannibalism or intra-guild predation. However, they showed a bimodal distribution and were on average far below the range found in the literature, matching the enrichment factors of gammarideans measured under laboratory conditions. These results are discussed considering the interaction of the distinctive isotopic features of basal resources in coastal habitats and the biology and ecology of gammaridean amphipods. Particular emphasis is placed on the high variability of nitrogen enrichment factors, and on their crucial role in attaining reliable results from isotopic models used for food web studies.

  4. Species richness of Cladocera (Crustacea: Branchiopoda in the Western Ghats of Maharashtra and Goa (India, with biogeographical comments

    Directory of Open Access Journals (Sweden)

    Sameer M. Padhye

    2014-08-01

    Full Text Available We assessed the species richness of Cladocera of the Western Ghats and surrounding areas of Maharashtra and Goa. Data of 230 samples from about 80 localities collected between 2009 and 2013 revealed 51 species in six families. Non-parametric estimators of species richness, Chao 2 and Jackknife 2, estimated the real total at 58 and 63 species, suggesting a coverage of 80% of the total species of the area. This fauna was compared with that of other countries from the Oriental region and found to be relatively species-poor, which is not in line with the biodiversity rich area status of the Western Ghats. Reasons for this are unclear. Complementarity among the cladoceran faunas of different countries belonging to the Oriental region increased with latitude and altitude. Along with the complementarity index, a comparison of family and generic occurrences of Cladocera revealed that family-level representation was similar between countries but species occurrences (like Daphnia species varied. The subgenus Daphnia was reported only from Nepal while Ctenodaphnia was common in all countries of the Indian region. Biogeographically, the fauna was mainly composed of wide-ranging tropical species, mixed with some rare Palaearctic elements. Only two species were endemic to India. Of another one, the closest relative lives in Yucatan, Mexico, and thus has a tropical Amphi-Pacific distribution.

  5. The complete mitochondrial genomes of the yellowleg shrimp Farfantepenaeus californiensis and the blue shrimp Litopenaeus stylirostris (Crustacea: Decapoda).

    Science.gov (United States)

    Peregrino-Uriarte, Alma B; Varela-Romero, Alejandro; Muhlia-Almazán, Adriana; Anduro-Corona, Iván; Vega-Heredia, Sarahí; Gutiérrez-Millán, Luis E; De la Rosa-Vélez, Jorge; Yepiz-Plascencia, Gloria

    2009-03-01

    Mitochondria play key roles in many cellular processes. Description of penaeid shrimp genes, including mitochondrial genomes are fairly recent and some are focusing on commercially important shrimp as the Pacific shrimp Litopenaeus vannamei that is being used for aquaculture not only in America, but also in Asia. Much less is known about other Pacific shrimp such as the yellowleg shrimp Farfantepenaeus californiensis and the blue shrimp Litopenaeus stylirostris. We report the complete mitogenomes from these last two Pacific shrimp species. Long DNA fragments were obtained by PCR and then used to get internal fragments for sequencing. The complete F. californiensis and L. stylirostris mtDNAs are 15,975 and 15,988 bp long, containing the 37 common sequences and a control region of 990 and 999 bp, respectively. The gene order is identical to that of the tiger shrimp Penaeus monodon. Secondary structures for the 22 tRNAs are proposed and phylogenetic relationships for selected complete crustacean mitogenomes are included. Phylogenomic relationships among five shrimp show strong statistical support for the monophyly of the genus across the analysis. Litopenaeus species define a clade, with close relationship to Farfantepenaeus, and both clade with the sister group of Penaeus and Fenneropenaeus. PMID:20403743

  6. Endogenous locomotor activity rhythm of two sympatric species of talitrids (Crustacea, Amphipoda) from a sandy beach of Tuscany, Italy

    OpenAIRE

    C. Rossano; Scapini, F.

    2011-01-01

    Abstract. The biological clock of living organisms, which is an evolutionary effect of their temporal adaptation to the environment, is known to be entrained by natural periodic variables; the behavioural and physiological response to these variables can be traced by laboratory recordings under constant conditions. Adult individuals of two sympatric talitrid species (Talitrus saltator and Orchestia gammarellus), inhabiting different niches of the same coastal ecosystem in the Maremma...

  7. Integrated DNA and morphological taxonomy to describe a new species of the Family Bathynellidae (Crustacea, Syncarida from Spain

    Directory of Open Access Journals (Sweden)

    Camacho, A. I.

    2013-12-01

    Full Text Available A new species of Bathynellidae Grobben, 1905 is described from Spain. Vejdovskybathy-nella vasconica sp. nov. displays an exclusive feature within the genus: eightsegmented antenna. Besides, the new species has a unique combination of morphological characters, including medial seta on exopod of antenna, antennule length similar to antenna, three-segmented mandibular palp without sexual dimorphism, four segments on endopod of thoracopod I to VII, three spines on the sympod of uropod, two claws on the endopod of uropod, first spine longer than the rest on the furcal rami, exopod smaller than endopod on female thoracopod VIII, a long frontal projection and medium size outer protuberance on penial region of male thoracopod VIII, and a medium size frontal crest with a small “spur” on basipod of male thoracopod VIII. Partial sequences from mitochondrial gene cytochrome oxidase I (COI and 18S ribosomal RNA (rRNA gene have been obtained from specimens of the type locality of the new species. The analyses of molecular data demonstrate the presence of two highly divergent genetic units within the Bathynellidae, corresponding to two morphologically well differenciated genera.Se describe una nueva especie de la familia Bathynellidae Grobben, 1905 de España. Vejdovskybathynella vasconica sp. nov. presenta un carácter único dentro del género, tener la antena de 8 segmentos. Además la nueva especie exhibe una única combinación de caracteres morfológicos que incluye: seda mediana presente en el exopodio de la antena, anténula y antena de igual longitud, palpo mandibular de tres segmentos y sin dimorfismo sexual, cuatro segmentos en el endopodio de todas las patas, tres espinas en el simpodio del urópodo, dos uñas en el endopodio del urópodo, la primera espina de la furca más larga que las demás, toracópodo VIII hembra con exopodio más pequeño que el endopodio, toracópodo VIII macho con una larga prolongación frontal y una protuberancia externa de tamaño medio en la región peneana, así como una cresta frontal de tamaño medio con un pequeño espolón en el basipodio. Se han obtenido sequencias parciales del gen mitocondrial citocromo oxidasa I (COI y del gen ribosomal 18S ARNr de especímenes de la localidad tipo de la nueva especie. El análisis de estos datos moleculares ha demostrado la presencia de dos unidades genéticas altamente divergentes entre ejemplares de la familia Bathynellidae correspondientes a dos géneros morfológicamente bien diferenciados. La información molecular obtenida en este trabajo complementa la descripción taxonómica tradicional, morfológica, apoyando la validez de la nueva especie perteneciente al género Vejdovskybathynella.

  8. Growth and reproductive dynamics of the South American red shrimp, Pleoticus muelleri (Crustacea: Solenoceridae), from the southeastern coast of Brazil

    Science.gov (United States)

    Castilho, A. L.; Wolf, M. R.; Simões, S. M.; Bochini, G. L.; Fransozo, V.; Costa, R. C.

    2012-12-01

    The increase in the fishing fleet in southeastern Brazil and the decrease in the landings of profitable shrimp species have contributed to the incorporation of additional species into those fisheries, such as Pleoticus muelleri. The goal of the present study is to investigate the growth and reproductive dynamics of P. muelleri in the Southeastern coast of Brazil over a period of two years. Monthly collections were conducted in Ubatuba (UB) and Caraguatatuba (CA) using a commercial shrimp fishing boat equipped with “double-rig” nets. Each region was divided into 7 sampling stations up to 35 m deep. Population parameters from size frequency distributions (carapace length = CL), growth, longevity, sex ratio, and abundance of individuals in each life period (demographic class), from both sampling areas were analyzed and compared. The relationship between abiotic factors and abundance of each demographic class was assessed using a Canonical Correlation Analysis (CCorrA). A total of 19,816 individuals were collected, of which 5341 were measured, with an estimated longevity of 2.02 (UB) and 2.15 (CA) years for females and 1.80 (UB) and 1.96 (CA) years for males. There was a statistically significant bias in sex ratio toward females (Chi-square test, p < 0.05) in both regions. The CCorrA resulted in a canonical correlation coefficient of 0.32 (p < 0.00001). Both temperature and grain size composition of the sediment showed high correlation mainly with the presence of reproductive females, followed spermatophore-bearing males and recruits. In general, these demographic classes were most common in conditions of low temperature and fine sediments. These findings, as well as other studies carried out in colder regions with the same species, are consistent with the classical paradigm of lower longevity at lower latitudes. However, our results also suggest that this species maintained abiotic preference as populations located in cold temperate regions, mainly with temperature, indicating a different behavior from other shrimp species explored by fishery in the same region.

  9. Oxidative Status Profile in Different Tissues of Parastacus brasiliensis promatensis (Crustacea, Decapoda, Parastacidae) over a Seasonal Cycle.

    Science.gov (United States)

    Pinheiro, Ludimila Carneiro; Oliveira, Guendalina Turcato

    2016-06-01

    The objective of this study was to assess annual redox balance by quantifying activity of the antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST), as well as measuring lipid peroxidation levels by determination of thiobarbituric acid-reactive substances, in different tissues of male and female crayfish collected from an area little affected by anthropogenic impacts. A total of 37 male and 32 female of Parastacus brasiliensis promatensis were collected over an annual cycle, and gill, muscle, hepatopancreas, and gonad samples were harvested and subjected to the aforementioned analyses via spectrophotometry. Comparison of the annual oxidative status response profile in gill and in hepatopancreas between males and females revealed differences only in SOD activity. In abdominal muscle, this comparison revealed a distinct profile of SOD and GST activity, as well as of lipid peroxidation. SOD activity in gonads of females increased in the summer when compared to autumn; conversely, CAT and GST levels did not differ over the year. During reproduction, a possible increase of the energy requirements led to an increase in lipid peroxidation in all tested tissues, in males and females alike. It was least evident in female gonad tissue, which suggests this tissue type is relatively protected; within this context, one may establish a tissue-specific grading of Lipid Peroxidation intensity in females of the species during the spring: gonads < muscle < gills < hepatopancreas. Our results show that the responses of the defenses analyzed antioxidants, as well as lipid peroxidation levels, were sex and tissue dependent and a clear pattern of seasonal variation. PMID:27256498

  10. Parthenogenetic reproduction of Diaphanosoma celebensis (Crustacea: Cladocera): influence of salinity on feeding, survival, growth and neonate production

    Digital Repository Service at National Institute of Oceanography (India)

    Achuthankutty, C.T.; Shrivastava, Y.; Mahambre, G.G.; Goswami, S.C.; Madhupratap, M.

    103C103C115 C40._C79C110C98C101C194 C49C57C55C55C44 C49C57C56C53C59 C71C114C105C99C101 C97C110C100 C77C97C114C99C117C115 C49C57C56C49C41C46 C66C117C116 C105C110 C116C104C101 C116C114C111C112C105C99C115C44 C116C104C101 C97C110C110C117C97C108 C116C101C...C97 C97C115 C102C101C101C100 C97C116 C53C44 C49C55C44 C50C53 C97C110C100 C51C48 C112C115C117 C115C97C108C105C110C105C116C121C46 C71C117C116 C112C105C103C109C101C110C116 C99C111C110C99C101C110C116C114C97C116C105C111C110 C115C104C111C119C101C100 C97 C...

  11. Rhopalophthalmus constrictus sp. nov. and Australomysis reubeni sp. nov. (Crustacea-Mysidacea) from south-west Australian waters

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    Two new species of mysids are described, Rhopalophthalmus constrictus sp. nov. is in having a well-produced triangular rostral plate, pleural plates on the anterior five abdominal somites and prominent constriction at the distal end of the telson...

  12. Neue marine Cyclopoida Gnathostoma (Crustacea, Copepoda) von Puerto Rico. Amsterdam Expeditions to the West Indian Islands, Report 57

    NARCIS (Netherlands)

    Herbst, Hans-Volkmar

    1989-01-01

    In the flat littoral of the coast of Puerto Rico (West Indies) at the reef of Cayo Enrique a few Cyclopoida Gnathostoma were collected in colonies of the corallimorpharian Ricordea florida Duch & Mich., which belong to the subfamilies Pterinopsyllinae and Euryteinae. These are the following species:

  13. Distribution, life cycle and demography in a brackish water population of the isopod Cyathura carinata (Kröyer) (Crustacea)

    Science.gov (United States)

    Ólafsson, Einar B.; Persson, Lars-Eric

    1986-11-01

    Cyathura carinata, an infaunal, fossorial, isopod is a dominant member of a brackish, shallow water macrobenthic community on the south coast of Sweden. It has a bi-annual life-cycle. Breeding occurs in June-July, and a single brood of between 18-63 eggs per female is produced. The eggs take about 3-4 weeks to develop, the juveniles emerge in mid-late July. Initial recruitment in the study area was estimated to be 1480-1850 juveniles m -2 for 1981-1983 year classes. About 5% of the recruits survive to reproductive age two years later. Growth was characterized by fast growth during summer-autumn, stagnation in winter, and a slow start in spring. Females and males were not separated until just prior to reproduction (i.e. in June of the second year). At this stage males were larger than females and sex ratio was 1:1. During the breeding season, the abundance of males decreased rapidly due to post-reproductive death. Females continued to live, carrying the developing eggs in their brood pouches. Adult females die shortly after the young are released. The entire generation of reproductive adults (two years of age) has died by mid August. No evidence of the stated protogynous hermaphroditism was found in our study. Cohort production was 1·83 g wet wt m -2 for the 1980 cohort and 1·33 for the 1981 cohort. P/B-ratios were 2·12 for the 1980 cohort and 2·48 for the 1981 cohort. The P/B-ratios found were closest to those calculated by the method of Waters when an accurate estimate of mortality was available.

  14. 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 . .

  15. Segunda adición a la lista de los crustáceos (Arthropoda: Crustacea) de aguas cubanas

    OpenAIRE

    Lalana, Rogelio; Ortiz, Manuel; Varela, Carlos

    2014-01-01

    Se presenta la segunda adición a la lista de crustáceos cubanos. Esta incluye todas las especies marinas, estuarinas y dulceacuícolas epigeas e hipogeas, que han sido citados para el país, desde la publicación de la primera adición hasta el presente. Se presentan además cinco especies de decápodos fósiles. En esta nueva versión se sigue el mismo sistema de presentación de los taxones, autores y la bibliografía correspondiente.

  16. Under the volcano: phylogeography and evolution of the cave-dwelling Palmorchestia hypogaea (Amphipoda, Crustacea at La Palma (Canary Islands

    Directory of Open Access Journals (Sweden)

    Oromí Pedro

    2008-01-01

    Full Text Available Abstract Background The amphipod crustacean Palmorchestia hypogaea occurs only in La Palma (Canary Islands and is one of the few terrestrial amphipods in the world that have adapted to a strictly troglobitic life in volcanic cave habitats. A surface-dwelling closely related species (Palmorchestia epigaea lives in the humid laurel forest on the same island. Previous studies have suggested that an ancestral littoral Orchestia species colonized the humid forests of La Palma and that subsequent drought episodes in the Canaries reduced the distribution of P. epigaea favouring the colonization of lava tubes through an adaptive shift. This was followed by dispersal via the hypogean crevicular system. Results P. hypogaea and P. epigaea did not form reciprocally monophyletic mitochondrial DNA clades. They showed geographically highly structured and genetically divergent populations with current gene flow limited to geographically close surface locations. Coalescence times using Bayesian estimations assuming a non-correlated relaxed clock with a normal prior distribution of the age of La Palma, together with the lack of association of habitat type with ancestral and recent haplotypes, suggest that their adaptation to cave life is relatively ancient. Conclusion The data gathered here provide evidence for multiple invasions of the volcanic cave systems that have acted as refuges. A re-evaluation of the taxonomic status of the extant species of Palmorchestia is needed, as the division of the two species by habitat and ecology is unnatural. The information obtained here, and that from previous studies on hypogean fauna, shows the importance of factors such as the uncoupling of morphological and genetic evolution, the role of climatic change and regressive evolution as key processes in leading to subterranean biodiversity.

  17. Condition factor of Goniopsis cruentata (Crustacea, Brachyura, Grapsidae from Mundaú/Manguaba estuarine complex, Alagoas, Brazil

    Directory of Open Access Journals (Sweden)

    José J. P. R. Lira

    2012-09-01

    Full Text Available The condition factor is a parameter which acts as a general indicator of the "well-being" of a species, and it can be obtained through the analysis of width vs. weight relationships. The present work aims to investigate size vs. weight relationship and the condition factor of the crab Goniopsis cruentata (Latreille, 1803. The study area was the Mundaú/Manguaba estuarine complex, Maceió, state of Alagoas, Northeast Brazil. Samplings were monthly accomplished from August 2007 to July 2008. A total of 626 individuals were analyzed, being 309 males and 317 females. Males were larger and heavier than females, what is expected in many brachyuran. The growth was positive allometric to both males (b = 3.42 and females (b = 3.30, not obeying the "cube law". The condition factor of female was higher than that of male crabs, probably due to the gonad weight of females. It also varied seasonally for both sexes, being higher in the autumn and winter in males, and in the autumn and spring in females, and related to the molt and period of spawning intensification.

  18. Condition factor of Goniopsis cruentata (Crustacea, Brachyura, Grapsidae) from Mundaú/Manguaba estuarine complex, Alagoas, Brazil

    OpenAIRE

    José J. P. R. Lira; Tereza C. S. Calado; Marina S.L.C. Araújo

    2012-01-01

    The condition factor is a parameter which acts as a general indicator of the "well-being" of a species, and it can be obtained through the analysis of width vs. weight relationships. The present work aims to investigate size vs. weight relationship and the condition factor of the crab Goniopsis cruentata (Latreille, 1803). The study area was the Mundaú/Manguaba estuarine complex, Maceió, state of Alagoas, Northeast Brazil. Samplings were monthly accomplished from August 2007 to July 2008. A t...

  19. On the Bennelongia barangaroo lineage (Crustacea, Ostracoda in Western Australia, with the description of seven new species

    Directory of Open Access Journals (Sweden)

    Koen Martens

    2013-11-01

    Full Text Available The ostracod genus Bennelongia De Deckker & McKenzie, 1981 is endemic to Australia and New Zealand. Extensive sampling in Western Australia (WA revealed a high specific and largely undescribed diversity. Here, we describe seven new species belonging to the B. barangaroo lineage: B. timmsi sp. nov., B. gnamma sp. nov., B. hirsuta sp. nov., B. ivanae sp. nov., B. mcraeae sp. nov., B. scanloni sp. nov. and B. calei sp. nov., and confirm the presence of an additional species, B. dedeckkeri, in WA. For five of these eight species, we could construct molecular phylogenies and parsimonious networks based on COI sequences. We also tested for cryptic diversity and specific status of clusters with a statistical method based on the evolutionary genetic species concept, namely Birky’s 4 theta rule. The analyses support the existence of these five species and a further three cryptic species in the WA B. barangaroo lineage. The molecular evidence was particularly relevant because most species described herein have very similar morphologies and can be distinguished from each other only by the shape, size and position of the antero-ventral lapel on the right valve, and, in sexual populations, by the small differences in shape of the hemipenes and the prehensile palps in males. Four species of the WA B. barangaroo lineage occur in small temporary rock pools (gnammas on rocky outcrops. The other four species are mainly found in soft bottomed seasonal water bodies. One of the latter species, B. scanloni sp. nov., occurs in both claypans and deeper rock pools (pit gnammas. All species, except for B. dedeckkeri, originally described from Queensland, have quite clearly delimited distributions in WA. With the seven new species described here, the genus Bennelongia now comprises 25 nominal species but several more await formal description.

  20. Toxicity of antifouling biocides to the intertidal harpacticoid copepod Tigriopus japonicus (Crustacea, Copepoda): Effects of temperature and salinity

    Energy Technology Data Exchange (ETDEWEB)

    Kwok, K.W.H. [Swire Institute of Marine Science, Department of Ecology and Biodiversity, University of Hong Kong, Pokfulam, Hong Kong (China); Leung, K.M.Y. [Swire Institute of Marine Science, Department of Ecology and Biodiversity, University of Hong Kong, Pokfulam, Hong Kong (China)]. E-mail: kmyleung@hkucc.hku.hk

    2005-07-01

    Intertidal harpacticoid copepods are commonly used in eco-toxicity tests worldwide. They predominately live in mid-high shore rock pools and often experience a wide range of temperature and salinity fluctuation. Most eco-toxicity tests are conducted at fixed temperature and salinity and thus the influence of these environmental factors on chemical toxicity is largely unknown. This study investigated the combined effect of temperature and salinity on the acute toxicity of the copepod Tigriopus japonicus against two common biocides, copper (Cu) and tributyltin (TBT) using a 2 x 3 x 4 factorial design (i.e. two temperatures: 25 and 35 {sup o}C; three salinities: 15.0 per mille , 34.5 per mille and 45.0 per mille ; three levels of the biocide plus a control). Copper sulphate and tributyltin chloride were used as the test chemicals while distilled water and acetone were utilised as solvents for Cu and TBT respectively. 96h-LC50s of Cu and TBT were 1024 and 0.149 {mu}g l{sup -1} respectively (at 25 {sup o}C; 34.5 per mille ) and, based on these results, nominal biocide concentrations of LC0 (i.e. control), LC30, LC50 and LC70 were employed. Analysis of Covariance using 'concentration' as the covariate and both 'temperature' and 'salinity' as fixed factors, showed a significant interaction between temperature and salinity effects for Cu, mortality increasing with temperature but decreasing with elevated salinity. A similar result was revealed for TBT. Both temperature and salinity are, therefore, important factors affecting the results of acute eco-toxicity tests using these marine copepods. We recommend that such eco-toxicity tests should be conducted at a range of environmentally realistic temperature/salinity regimes, as this will enhance the sensitivity of the test and improve the safety margin in line with the precautionary principle.

  1. A new gnathiid (Crustacea: Isopoda) parasitizing two species of requiem sharks from Lizard Island, Great Barrier Reef, Australia.

    Science.gov (United States)

    Coetzee, Maryke L; Smit, Nico J; Grutter, Alexandra S; Davies, Angela J

    2008-06-01

    Third-stage juveniles (praniza 3) of Gnathia grandilaris n. sp. were collected from the gill filaments and septa of 5 requiem sharks, including a white tip reef shark, Triaenodon obesus, and 4 grey reef sharks, Carcharhinus amblyrhynchos, at Lizard Island, Great Barrier Reef, Australia, in March 2002. Some juvenile gnathiids were then maintained in fresh sea water until they molted to adults. Adult males appeared 19 days following detachment of juveniles from host fishes, but no juveniles molted successfully into females. The current description is based, therefore, on bright field and scanning electron microscopy observations of adult males and third-stage juveniles. Unique features of the male include the triangular-shaped inferior medio-frontal process, 2 areolae on the dorsal surface of the pylopod, and a slender pleotelson (twice as long as wide) with lateral concavities. The third-stage juvenile has distinctive white pigmentation on the black pereon when alive, while the mandible has 9 triangular backwardly directed teeth. This species has the largest male and third-stage juvenile of any Gnathia spp. from Australia and of any gnathiid isopods associated with elasmobranchs. PMID:18605791

  2. In vitro embryogenesis of Neomysis integer (Crustacea, Mysidacea) as a potential indicator of endocrine disruption

    OpenAIRE

    Fockedey, N; Bruwiere, S.; Ghekiere, A.; Vincx, M.

    2005-01-01

    The brackish water mysid Neomysis integer has been put forward to use as a test organisms for the evaluation of environmental endocrine disruption in the brackish reaches of Western European estuaries and inland water bodies. As the embryonic development is a critical time window within the life history of an organism, it has high potential to serve as a bio-assay for testing endocrine disruption. Within the present study a protocol has been developed to follow the in vitro embryogenesis of N...

  3. Giselinidae fam. nov., a new monophyletic group of cyclopoid copepods (Copepoda, Crustacea) from the Atlantic deep sea

    Science.gov (United States)

    Martínez Arbizu, Pedro

    2000-12-01

    Four new species of Cyclopoida from deep-sea waters are described and placed in two new genera: Giselina gen. n. and Sensogiselina gen. n. The new genera and species belong to a new monophyletic group within the cyclopinid cyclopoids. A new name, Giselinidae, is proposed for this monophylum. The new family is characterised by the combination of the following characters: (1) tergite of leg 1 fused to cephalosome dorsally, but incompletely fused laterally, (2) absence of aesthetascs on ancestral antennulary segments XVI, XXI and XXV, (3) absence of antennary exopodal setae, (4) presence of only three spines on distal exopodal segment of leg 1, (5) absence of inner setae on first endopodal segments of legs 1-4, (6) outer terminal and distal inner elements of distal endopodal segment of leg 4 transformed into spines, (7) distal outer element of leg 5 exopod transformed into a spine, (8) leg 6 with only one seta, and (9) furcal setae I and III located on dorsal margin.

  4. New Report on Two Species of Hippolytid Shrimps (Crustacea: Decapoda: Caridea Collected at Sea Cucumber Farm, East Sea, Korea

    Directory of Open Access Journals (Sweden)

    Lee, Chu

    2014-04-01

    Full Text Available Two species of hippolytid shrimps, Eualus kuratai Miyake and Hayashi, 1967 and Heptacarpus igarashii Hayashi and Chiba, 1989, were collected at a sea cucumber farm from the East Sea. These species are described and illustrated for the first time in Korea. Eualus kuratai is closely related to E. middendorffi; however, it lacks a dorsomedian spine on the fourth and fifth abdominal somites. Heptacarpus igarashii can be easily distinguished from other Korean Heptacarpus species due to its short rostrum that lacks ventral teeth on margin. This report extends the previously known ranges from Japan and Korea. In Korea, both genera, Eualus and Heptacarpus, have seven species according to the present report, respectively; moreover, hippolytid shrimps now consist of 31 species of nine genera.

  5. Ecotoxicity and environmental risk assessment of larvicides used in the control of Aedes aegypti to Daphnia magna (Crustacea, Cladocera).

    Science.gov (United States)

    Abe, Flavia Renata; Coleone, Ana Carla; Machado, Angela Aparecida; Gonçalves Machado-Neto, Joaquim

    2014-01-01

    Dengue transmitted by mosquitoes of the genus Aedes, species aegypti, is a major public health concern in Brazil. The chemical control of the mosquito larvae has been performed with the larvicide temephos since 1967. However, vector resistance was reported to temephos in several Brazilian states, and the Ministry of Health ordered the replacement of this larvicide by diflubenzuron (DFB), an inhibitor of chitin synthesis. Both insecticides are diluted in water with larvae and are able to reach aquatic environments in which they subsequently adversely damage nontarget organisms. The aims of this study were to (1) determine the acute toxicity (EC50) and environmental risk (RQ) of DFB and temephos to the microcrustacean Daphnia magna, and (2) evaluate the chronic toxicity (no-observed-effect concentration [NOEC] and lowest-observed-effect concentration [LOEC]) of these larvicides to D. magna. The experiments were performed according to a completely randomized design. The estimated 48-h EC50 of temephos was 0.15 μg/L (lower limit = 0.1 and upper limit = 0.2 μg/L) and the 48-h EC50 of DFB was 0.06 μg/L (lower limit = 0.03 and upper limit = 0.1 μg/L). RQ values were 4.166.7 to DFB and 6.666.6 to temephos. NOEC and LOEC values were respectively 2.5 and 5 ng/L for DFB, and respectively 6.2 and 12.5 ng/L for temephos. Thus, temephos and DFB are classified as highly toxic to Daphnia magna and pose a high environmental risk to this species. Mortality of D. magna was observed at concentrations lower than those used in the field to control A. aegypti larvae. PMID:24555645

  6. A new species of Malayopotamon Bott, 1968 (Crustacea: Decapoda: Brachyura: Potamidae), a freshwater crab from northern Sumatra, Indonesia.

    Science.gov (United States)

    Ng, Peter K L

    2014-01-01

    A new species of potamid freshwater crab, Malayopotamon weh sp. nov., is described from the island of Pulau Weh off northern Sumatra, Indonesia. The species superficially resembles three Sumatran species: M. batak Ng & Wowor, 1991, M. tobaense (Bott, 1968), and M. turgeo Ng & Tan, 1999, but can easily be distinguished by various carapace as well as gonopod characters. PMID:24871194

  7. Antennulary sensory organs in cyprids of Octolasmis and Lepas (Crustacea: Thecostraca: Cirripedia: Thoracica): a scanning electron microscopic study

    DEFF Research Database (Denmark)

    Blomsterberg, Mikkel; Høeg, Jens T; Jeffries, William B;

    2004-01-01

    attachment site within the branchial chamber of swimming crabs and, in particular, no similarities with cyprids of rhizocephalan barnacles, many of which also attach in the gill chamber. The synapomorphies between cyprids of the lepadid species may be adaptations to their life in the neuston....

  8. First record of Wolbachia in South American terrestrial isopods: prevalence and diversity in two species of Balloniscus (Crustacea, Oniscidea

    Directory of Open Access Journals (Sweden)

    Mauricio Pereira Almerão

    2012-01-01

    Full Text Available Wolbachia are endosymbiotic bacteria that commonly infect arthropods, inducing certain phenotypes in their hosts. So far, no endemic South American species of terrestrial isopods have been investigated for Wolbachia infection. In this work, populations from two species of Balloniscus (B. sellowii and B. glaber were studied through a diagnostic PCR assay. Fifteen new Wolbachia 16S rDNA sequences were detected. Wolbachia found in both species were generally specific to one population, and five populations hosted two different Wolbachia 16S rDNA sequences. Prevalence was higher in B. glaber than in B. sellowii, but uninfected populations could be found in both species. Wolbachia strains from B. sellowii had a higher genetic variation than those isolated from B. glaber. AMOVA analyses showed that most of the genetic variance was distributed among populations of each species rather than between species, and the phylogenetic analysis suggested that Wolbachia strains from Balloniscus cluster within Supergroup B, but do not form a single monophyletic clade, suggesting multiple infections for this group. Our results highlight the importance of studying Wolbachia prevalence and genetic diversity in Neotropical species and suggest that South American arthropods may harbor a great number of diverse strains, providing an interesting model to investigate the evolution of Wolbachia and its hosts.

  9. Cases of niche-partitioning and of habitat-segregation in pelagic marine calanoids of the genus Euchirella (Crustacea: Copepoda)

    NARCIS (Netherlands)

    Vaupel Klein, von J.C.

    1998-01-01

    Two cases of apparent niche-partitioning and one case of alleged habitat-segregation in the calanoid copepod genus Euchirella are described. These are examined with regard to their possible implications for making generalizations about the structure of biocoenoses and about mechanisms of speciation

  10. Anatomy of virgin and mature externae of Loxothylacus texanus, parasitic on the dark blue crab Callinectes rathbunae (Crustacea

    DEFF Research Database (Denmark)

    Alvarez, Fernando; Bortolini, José Luis; Høeg, Jens Thorvald

    2010-01-01

    Rhizocephalan parasites are dioecious organisms, in that one or several dwarf males are implanted into the external part of the female parasite soon after it emerges from the interior of the host animal. The structure of the female externa and its resident males is crucial for understanding both...

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

    OpenAIRE

    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 Africa. The Atlantic Ocean islands of Sherbro, Bioko, Príncipe, and São Tomé support five species of Potamonautidae, while the Western Indian Ocean islands of the Seychelles, Zanzibar, Pemba, Mafi...

  12. Relative growth of the mangrove crab Ucides cordatus (Linnaeus, 1763 (Crustacea, Brachyura, Ocypodidae at Iguape, São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Marcelo Antonio Amaro Pinheiro

    2006-09-01

    Full Text Available A total of 2,130 individuals of Ucides cordatus (1,255 males and 875 females were captured in a mangrove forest at Iguape, São Paulo, Brazil. For each crab, the following body structures were measured: carapace (width = CW; length = CL; depth = CD, 5th abdominal somite (AW, major chelar propodus (length = PL; width = PW; depth = PD, and 1st and 2nd gonopod pairs (length = GL1 and GL2. The Student "t" and Snedecor "F" tests were used to verify any changes in growth allometric rates during ontogeny. The relationships CLxCW, PLxCW (for both sexes, GL1xCW and GL2xCW (males and AWxCW (females, showed a better fit by two equations for the juvenile and adult phases (p 59 mm. Females showed a similar size interval: (juvenile CW 58 mm.Um total de 2,130 indivíduos de U. cordatus (1,255 machos e 875 fêmeas foi coletado em Iguape (SP, Brasil. Cada exemplar foi submetido à biometria das seguintes estruturas: cefalotórax (largura = CW; comprimento = CL; altura = CD, quinto somito abdominal (AW, própodo quelar (comprimento = PL; espessura = PW; altura = PD, e 1º e 2º par de gonopódios (comprimento = GL1 e GL2. O teste "t" Student e "F" de Snedecor foram utilizados para identificar diferenças no grau de alometria e alterações ontogenéticas na taxa de crescimento, respectivamente. As relações CLxCW, PLxCW (ambos os sexos, GL1xCW e GL2xCW (machos e AWxCW (fêmeas, apresentaram ajuste por duas equações representando a fase jovem e adulta (p59mm, com tamanho similar ao dos morfotipos das fêmeas (jovens CW58mm.

  13. Survey of cyclopids (Crustacea, Copepoda in Brazil and preliminary screening of their potential as dengue vector predators

    Directory of Open Access Journals (Sweden)

    Santos Luciana Urbano dos

    1997-01-01

    Full Text Available INTRODUCTION: Cyclopid copepods are known to be good mosquito controllers, specially as regards the larvae of the dengue vectors Aedes aegypti and Ae. albopictus. MATERIAL AND METHOD: The objective of the study was to survey the local copepod fauna and search for new strains of M. longisetus var. longisetus, comparing the potential of the samples found with the current strain ML-01 against Ae. albopictus larvae, under laboratory conditions. Eleven bodies of water in Campinas, SP, Brazil, were screened for copepods by collecting 1.5 l of water from each of then. The predatory potential of adults copepods was evaluated over 24 h, in the laboratory, for groups of 5 individuals preying upon 30 first instar Ae. albopictus larvae. RESULTS AND CONCLUSION: The following cyclopid species were found: Metacyclops mendocinus, Tropocyclops prasinus, Eucyclops sp, Eucyclops serrulatus, Eucyclops solitarius, Eucyclops ensifer, Macrocyclops albidus var. albidus and Mesocyclops longisetus var. longisetus. The predatory potential of these copepods ranged from nil to 97.3%. A sample collected in the field containing only M. longisetus var. longisetus showed the best control efficiency with no significant difference from a three-year old laboratory culture (ML-01 of the same species evaluated for comparison. The sample with few M. albidus var. albidus was ranked in second place showing an average 25.9% efficiency. The use of copepods in trap tires as dengue vector controllers is discussed.

  14. Life histories and seasonal dynamics of common boreal pelagic copepods (Crustacea, Copepoda inhabiting an oligotrophic Fennoscandian lake

    Directory of Open Access Journals (Sweden)

    Svein Birger WÆRVÅGEN

    2010-08-01

    Full Text Available The annual seasonal abundance and spatial distribution of four widespread pelagic copepods, the Palaeartic calanoid Eudiaptomus gracilis, the cyclopoids Mesocyclops leuckarti and Thermocyclops oithonoides, and the Holartic Cyclops scutifer were investigated in Lake Gjerstadvann, an oligotrophic boreal lake. Important ecological traits such as life cycles, pelagic microhabitats and wintering strategies varied strongly between the investigated copepods, and influenced seasonal succession in the plankton community. Fish predation did not seem to affect copepod abundances, except perhaps the two lage-sized, less abundant species, the Palaeartic calanoid Heterocope saliens and the Holartic cyclopoid Cyclops abyssorum. Life cycles varied from one (C. scutifer to three (M. leuckarti and E. gracilis complete generations per year, primarily related to habitat temperatures. Wintering took place as late instars (C. scutifer, C. abyssorum or cop V and adults (E. gracilis in the plankton, late instars in profundal (T. oithonoides or littoral (M. leuckarti sediment diapause, and embryonic diapause in sediment egg bank (H. saliens. C. scutifer and C. abyssorum exhibited delayed development in the profundal waters during winter, which could be characterised as so-called "active diapause". C. scutifer, T. oithonoides, and C. abyssorum in Lake Gjerstadvann were probably negatively affected by acidified waters. M. leuckarti seemed to be the most acid-tolerant of these species being able to endure pH slightly below 5.0, whereas T. oithonoides was usually absent at such pH levels. The calanoid species H. saliens and E. gracilis were extremely tolerant towards acidic environments. The yearly differences in population abundance as indicated by the fluctuations in the diapausing populations were probably due to environmental variations in water chemistry occurring during the most vulnerable ontogenetic stages, i.e., eggs and nauplii. Even if the pelagic ecosystem in boreal and oligotrophic lakes may appear homogeneous, a whole array of life histories and dormancy patterns has evolved among copepods.

  15. Feeding adult of Artemia salina (Crustacea-Branchiopoda on the dinoflagellate Gyrodinium corsicum (Gymnodiniales and the Chryptophyta Rhodomonas baltica

    Directory of Open Access Journals (Sweden)

    Rauquírio André Albuquerque Marinho da Costa

    2005-07-01

    Full Text Available Experiments were carried out on feeding performance and survival rates of adult Artemia salina exposed to no axenic strains of the dinoflagellate Gyrodinium corsicum and of the Chryptophyta Rhodomonas baltica. Filtration rates on R. baltica and G. corsicum varied from 3.35 to 7.14 ml.artemia-1.h-1 and from 2.97 to 15.86 ml.artemia-1.h-1, respectively. The ingestion rates observed for A. salina did not indicate any digestive dysfunction or physiological impairment for organisms fed on G. corsicum and their functional response were similar to those observed for other organisms like copepod fed on different food concentrations. Mortality rates oscillated from 2.5% to 100% when A. salina was fed on R. baltica or G. corsicum, respectively. Highest mortality rates observed for organisms fed on G. corsicum indicated that this dinoflagellate presented a hazard effect on A. salina that was not possible to confirm if it was related to toxin production or to nutritive inadequacy of this dinoflagellate as food for organisms of this species.Experimentos foram desenvolvidos para estudar as taxas de alimentação e de sobrevivência de Artemia salina alimentada com cepas não tóxicas do dinoflagelado Gyrodinium corsicum e da Chryptophyta Rhodomonas baltica. As taxas de filtração sobre R. baltica e G. corsicum variaram entre 3,35 e 7,14 ml.artemia-1.h-1 e 2,97 e 15,86 ml.artemia-1.h-, respectivamente. As taxas de ingestão observadas para A. salina não indicaram disfunção digestiva ou prejuízo fisiológico nos organismos alimentados com G. corsicum, sendo a resposta funcional destes organismos similar a observada em copépodos alimentados com diferentes concentrações de alimento. As taxas de mortalidade de A. salina oscilaram entre 2,5 e 100% quando alimentada com R. baltica e G. corsicum, respectivamente. As maiores taxas de mortalidade observadas para os organismos alimentados com G. corsicum indicam que este dinoflagelado apresenta algum efeito nocivo sobre A. salina, embora não tenha sido possível corfirmar se sua origem está relacionada com a produção de toxinas ou com a inadequação nutritiva deste dinoflagelado para alimentação de organismos desta espécie.

  16. Feeding adult of Artemia salina (Crustacea-Branchiopoda) on the dinoflagellate Gyrodinium corsicum (Gymnodiniales) and the Chryptophyta Rhodomonas baltica

    OpenAIRE

    Rauquírio André Albuquerque Marinho da Costa; Maria Luise Koening; Luci Cajueiro Carneiro Pereira

    2005-01-01

    Experiments were carried out on feeding performance and survival rates of adult Artemia salina exposed to no axenic strains of the dinoflagellate Gyrodinium corsicum and of the Chryptophyta Rhodomonas baltica. Filtration rates on R. baltica and G. corsicum varied from 3.35 to 7.14 ml.artemia-1.h-1 and from 2.97 to 15.86 ml.artemia-1.h-1, respectively. The ingestion rates observed for A. salina did not indicate any digestive dysfunction or physiological impairment for organisms fed on G. corsi...

  17. Origin and occurrence of sexual and mating systems in Crustacea: A progression towards communal living and eusociality

    Indian Academy of Sciences (India)

    T Subramoniam

    2013-12-01

    Crustaceans are known for their unrivalled diversity of sexual systems, as well as peculiar mating associations to achieve maximum mating success and fertilization accomplishment. Although sexes are separate in most species, various types of hermaphroditism characterize these predominantly aquatic arthropods. A low operational sex ratio between female and male, together with temporally limited receptivity of females towards males, imposes restrictions on the structuring of mating systems in crustaceans. The basic mating systems consist of monogamy, polygamy, mate guarding and pure searching. Understandably, ecological influences may also play a determinative role in the evolution of such sexual and mating systems in crustaceans. An important outcome of the crustacean sexual biology is the development of complex social structures in many aquatic species, in much the same way insects have established them in terrestrial conditions. In addition, groups like isopods and certain families of brachyuran crabs have shown terrestrial adaptation, exhibiting peculiar reproductive modes, sometimes reminiscent of their terrestrial counterparts, insects. Many caridean shrimps, living in symbiotic relationship with other marine invertebrates in the coral reef habitats, have reached pinnacle of complexity in sexuality and peculiar mating behaviours, resulting in communal living and establishing advanced social systems, such as eusociality.

  18. Genetic divergence and evolutionary times: calibrating a protein clock for South-European Stenasellus species (Crustacea, Isopoda

    Directory of Open Access Journals (Sweden)

    Valerio Ketmaier

    1997-01-01

    Full Text Available We studied genetic divergence in a group of exclusively stygobiont isopods of the family Stenasellidae. In particular, we assessed evolutionary relationships among several populations of Stenasellus racovitzai and Stenasellus virei. To place this study in a phylogenetic context. we used another species of Stenasellus, S. assorgiai, as an outgroup. S. racovitzai occurs in Corsica, Sardinia and in the fossil islands of the Tuscan Archipelago, while S. virei is a polytypic species widely distributed in the central France and Pyrenean area. This vicariant distribution is believed to be the result of the disjunction of the Sardinia-Corsica microplate from the Pyrenean region and its subsequent rotation. Since geological data provide time estimates for these events, we can use the genetic distance data to calibrate a molecular clock for this group of stygobiont isopods. The calibration of the molecular clock reveals a roughly linear relationship (r = 0.753 between the genetic distances and absolute divergence times, with a mean divergence rate (19.269 Myr/DNei, different from those previously reported in the literature and provides an opportunity to shed some light on the evolutionary scenarios of other Stenasellus species.

  19. On a record of Dardanus venosus (H. Milne Edwards (Crustacea, Anomura from the São Paulo State, Brazil

    Directory of Open Access Journals (Sweden)

    Fernando Luis Medina Mantelatto

    2001-03-01

    Full Text Available The present work is the first report of Dardanus venosus (H. Milne Edwards, 1848 in São Paulo State and extends the range of this species in the western Atlantic farther to the south in the Brazilian region. A total of twenty two males (mean shield length: 7.56 ± 1.62 mm, 4.7 to 10.9 mm, and fifteen females (7.25 ± 2.53 mm, 4.3 to 14.5 mm were collected in 1987, 1998, 1999 and 2000 by scuba diving from three areas of Anchieta Island (23º33'S, 45º05'W in the Ubatuba region, and south of São Sebastião Island (23º57.8'S, 45º16'W, northern coast of São Paulo State. No ovigerous females were captured during the study period. Shells of eleven gastropod species were occupied by D. venosus: Astraea latispina (Philippi, 1844, A. olfersii (Philippi, 1846, A. phoebia Roding 1798, Calliostoma bullisi Clench & Turner 1960, Chicoreus tenuivaricosus (Dautzenberg, 1927, Cymatium parthenopeum (von Salis, 1793, Olivancillaria urceus (Röding, 1798, Phalium granulation (Born, 1778, Stramonita haemastoma (Linnaeus, 1767, Strombus pugilis Linnaeus, 1758 and Zidona dufresnei (Donovan, 1823.

  20. Effect of gender on physiological and behavioural responses of Gammarus roeseli (Crustacea Amphipoda) to salinity and temperature

    International Nuclear Information System (INIS)

    The importance of potentially interacting factors in organisms responses to a stress are often ignored or underestimated in ecotoxicology. In laboratory experiments we investigated how gender, temperature and age influence the behaviour and the physiology of the freshwater amphipod Gammarus roeseli under salinity stress. Our results revealed a significant higher sensitivity of females in survival, ventilation and ionoregulation whereas no inter-age differences were reported. Water temperature also exerted a significant effect in survival and ventilation of G. roeseli. Some of those factors appeared to interact significantly. This study provides evidence that gender can affect organisms responses to a stressor and consequently has to be considered while assessing a stress impact. We discussed the potential relationships between biological and behavioural responses. - Influence of gender, age and temperature in a gammarid responses to a stress.

  1. 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.

  2. 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.

    ...……………Charybdis (Charybdis) hellerii (A. Milne Edwards, 1867). - Median and sub-median frontal teeth broadly rounded, medians project slightly in advance of sub-medians; posterior margin of propodus of natatory leg smooth……………………………Charybdis (Charybdis) spinifera (Miers..., 1884). 15. Posterior margin of propodus of natatory leg serrated……………………..……16. - Posterior margin of propodus of natatory leg smooth………….……………….21. 16. All frontal teeth sharply triangular………………………..……………..Charybdis (Charybdis) acuta (A. Milne...

  3. Population ecology of the planktonic shrimp Lucifer faxoni Borradaile, 1915 (Crustacea, Sergestoidea, Luciferidae of the southeastern coast of Brazil

    Directory of Open Access Journals (Sweden)

    Sarah de Souza Alves Teodoro

    2012-06-01

    Full Text Available Luciferid shrimps have short life spans and a rapid turnover of generations, engage in sequential spawning, and protect their eggs during incubation. This study investigates the ecology of Lucifer faxoni Borradaile, 1915 in the littoral zone, Ubatuba region, São Paulo. Sampling was conducted monthly from July 2005 to December 2006 using a Renfro net trawled over a distance of 50 m for a total sampling effort of 50 m² at each station. Nine stations were sampled, ranging from 1 to 15 m deep. Three stations each were grouped into zones 1, 2 and 3 (Z1, Z2 and Z3. Monthly values of salinity, temperature and rainfall were recorded at each station. The pre-buccal somite length (SL of each specimen was measured. The results showed that in shallower zones (Z1 and Z2, 6306 individuals were captured, whereas in the deeper zone (Z3, 3808 specimens were captured, but no significant differences in SL was detected between the specimens from Z1 and Z2 and those from Z3 (ANOVA, p=0.25. The abundance of shrimps did not differ significantly between seasons (Tukey's test, p=0.02 except in the spring. The sex ratio differed significantly over the seasons (χ², pEste estudo analisa a ecologia de Lucifer faxoni Borradaile, 1915 em Ubatuba, São Paulo. Os indivíduos foram coletados mensalmente de julho de 2005 a dezembro de 2006, com uma rede de Renfro, arrastada por uma distância de 50 m, totalizando um esforço amostral de 50 m² em cada ponto de coleta. Nove pontos foram amostrados, variando de 1 a 15 m de profundidade. Cada 3 pontos foram agrupados em 3 zonas (Z1, Z2 e Z3. Os valores de salinidade, temperatura e pluviosidade foram registrados mensalmente em cada transecto. Os espécimes foram medidos quanto ao comprimento do somito pré-bucal (SL. Os resultados mostram que nas zonas mais rasas (Z1 e Z2 foram coletados 6306 indivíduos, enquanto que na mais profunda (Z3 obteve-se 3808 espécimes, não havendo diferença estatística entre as zonas (ANOVA, p=0.25. A abundância não diferiu estatisticamente entre as estações do ano (Tukey, p=0.02, exceto para a primavera. Em todas as estações amostradas, o sex ratio diferiu estatisticamente (χ², p< 0.05. Os fatores ambientais aqui analisados apresentaram relação estreita com a distribuição espaço-temporal de L. faxoni. A pluviosidade influenciou diretamente a salinidade, que provocou o deslocamento dos camarões L. faxoni para áreas mais profundas.

  4. Seasonal variation in reproductive traits of the oriental shrimp Palaemon macrodactylus (Crustacea: Caridea: Palaemonidae) in a non-native population

    Science.gov (United States)

    Vázquez, M. Guadalupe; Bas, Claudia C.; Spivak, Eduardo D.

    2013-12-01

    The magnitude of variations in reproductive traits of Palaemon macrodactylus females throughout a breeding season was studied in a non-native population at Mar del Plata harbor, Argentina. Fecundity, egg size, reproductive output, weight and elemental composition of eggs, and larvae were analyzed in females collected at the beginning, in the mid point, and near the end of a reproductive season and designated as early, middle season, and late females. The highest reproductive output was observed in early females, while the highest fecundity and egg volume occurred in middle season females. Eggs and larvae showed larger body mass in early than in late females. Embryos from early females contained and consumed more carbon during development than embryos from late females, and they also used part of the available nitrogen. Differences in reproduction were observed among the three groups of females. On the one hand, late females matured early but had a poor first reproduction, with few embryos and high egg loss; however, they had longer reproductive life and an enhanced reproductive output in the following season when they became early females. On the other hand, females collected at the midpoint in the reproductive season matured later and had the highest fecundity and egg volume. In addition, larvae with different characteristics resulted from each type of female and were presumably well adapted to the conditions prevailing at the moment they hatched. The extended reproductive period and the diversity of embryos and larvae produced may favor the invading ability of the species.

  5. Uptake, Accumulation and Excretion by Corophium volutator(Crustacea: Amphipoda) of Zinc, Cadmium and Cobalt Added to Sewage Sludge

    Science.gov (United States)

    Burgos, M. Galay; Rainbow, P. S.

    1998-11-01

    Zinc, cadmium and cobalt associated with digested sewage sludge are available to the benthic deposit-feeding amphipodCorophium volutator(Pallas). Accumulation by the amphipod of radioactively labelled metals adsorbed onto a 5% sludge-sediment mixture increased with time of exposure up to 15 days, but irregularly so as pulses of labelled metal were excreted into faecal pellets. The three labelled metals were accumulated and excreted apparently almost synchronously by individual amphipods, although great variability between different individuals was found. This intraspecific variability could not be attributed to differences between male and female amphipods. Net accumulation of labelled metals from the sludge increased with increased labelled metal concentration in the sludge, but not with time beyond an initial period of 15-30 days. It is proposed that the metal excretion patterns might reflect the breakdown of epithelial cells of the ventral caeca following a cell cycle, releasing accumulated stores of detoxified metals into the gut lumen and out of the body through faeces.

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

    Directory of Open Access Journals (Sweden)

    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.

  7. A new cavernicolous freshwater crab, Thelphusula styx sp. nov. (Crustacea: Decapoda: Brachyura: Gecarcinucidae), from Gunong Mulu, Sarawak, Borneo

    OpenAIRE

    Ng, P.K.L.

    1989-01-01

    A new species of gecarcinucid freshwater crab, Thelphusula styx spec. nov., is described from Gunong Mulu National Park in Sarawak, Borneo. This is the third species of Thelphusula reported from the area.

  8. Use of Streptomyces fradiae and Bacillus megaterium as probiotics in the experimental culture of tiger shrimp Penaeus monodon (Crustacea, Penaeidae

    Directory of Open Access Journals (Sweden)

    Sheikh Aftabuddin

    2013-05-01

    Full Text Available Shrimp hatcheries often beset with diseases, mainly the bacterial infection and antibiotics arewidely used for prevention of disease. Presently, beneficial bacteria (probiotics are used to preventdiseases instead of antibiotics and increasing the production. In the present study, the two new microbialstrains Bacillus megaterium and Streptomyces fradiae isolated from mangrove sediments were applied(experimental culture for the post larval rearing of Penaeus monodon which is compared with controlculture tanks (without probiotics. The water quality condition such as temperature (27-29oC, salinity(26-28‰ and dissolved oxygen (4.7-5.0 mg L-1 of both control and experimental culture were more orless similar. Concentration of ammonia and pH were significantly different (p<0.05 between the controland experimental culture during the study period. The feed assimilation efficiency is higher (above 80%in experimental culture tank when compared to control tank (74.76%. The growth rate was higher -1.70 and 1.67 in S. fradiae, 1.66 and 1.63 in B. megaterium - through feed and water, respectively,while in control tank it was 1.4. The FCR values were 2.06 and 2.12 in S. fradiae treated tanks throughfeed and water, respectively, while 2.51 and 2.55 were observed in B. megaterium treated through feedand water respectively. The FCR value was found higher (4.02 in the control tank. The average totalheterotrophic bacteria (THB and total presumptive Vibrio bacteria both in culture water and post larvaewere lower during experimental culture in compared to control culture. The present study indicates thatthe probiotic treatment using two new microbial strains such as B. megaterium and S. fradiae would helpin better aquaculture production.

  9. Salmoneus kekovae, a new species of alpheid shrimp (Crustacea: Decapoda: Caridea from the south-western coast of Turkey

    Directory of Open Access Journals (Sweden)

    G. GRIPPA

    2012-12-01

    Full Text Available A new species of Salmoneus collected in Turkish waters is described. It appears to live in burrows associated with gobiid fish or thalassinidean decapods, as do other species in the genus. Previously, twenty Salmoneus species have been recognised worldwide, two of which are known from the Mediterranean. Some morphological features are discussed in order to determine their taxonomic value. A table summarises the geographical distribution of the 21 species currently recognised.

  10. Ostracods (Crustacea associated with microbialites across the Permian-Triassic boundary in Dajiang (Guizhou Province, South China

    Directory of Open Access Journals (Sweden)

    Marie-Beatrice FOREL

    2012-08-01

    Full Text Available 26 samples were processed for a taxonomic study of ostracods from the Upper Permian (Changhsingian - Lower Triassic (Griesbachian interval of the Dajiang section, Guizhou Province, South China. 112 species belonging to 27 genera are recognized. Five new species are described: Acratia candyae sp. nov, Bairdia adelineae sp. nov., Bairdia? huberti sp. nov., Bairdia jeromei sp. nov., Orthobairdia jeanlouisi sp. nov. The unexpected survival faunas associated with microbial formations in the aftermath of the end-Permian extinction are documented for the first time. Ostracod biodiversity variations and palaeo-environmental modifications associated with microbial growth through the Permian-Triassic boundary (PTB are discussed.

  11. Natural humic substances effects on the life history traits of Latonopsis australis SARS (1888) (Cladocera--Crustacea).

    Science.gov (United States)

    de Carvalho-Pereira, Ticiana Soares de Andrade; Santos, Thirza de Santana; Pestana, Edilene M S; Souza, Fábio Neves; Lage, Vivian Marina Gomes Barbosa; Nunesmaia, Bárbara Janaína Bezerra; Sena, Palloma Thaís Souza; Mariano-Neto, Eduardo; da Silva, Eduardo Mendes

    2015-02-01

    Cultivation medium is one of the first aspects to be considered in zooplankton laboratory cultivation. The use of artificial media does not concern to reproduce natural conditions to the cultivations, which may be achieved by using natural organic compounds like humic substances (HS). This study aimed to evaluate the effects of a concentrate of dissolved organic carbon (DOC) from the Negro River (NR(1)) and an extraction of humic acids (HA) from humus produced by Eisenia andrei on the life history traits of laboratory-based Latonopsis australis SARS (1888). A cohort life table approach was used to provide information about the effectiveness of NR and HA as supplements for the artificial cultivation of L. australis. Additionally, we seek to observe a maximization of L. australis artificial cultivation fitness by expanding the range of HS concentrations. The first experiment demonstrated that the females of L. australis reared under NR10 (mgDOCL(-1)) may have experienced an acceleration of the population life cycle, as the females have proportionally reproduced more and lived shorter than controls. By contrast, the use of the HA did not improve life history traits considered. The expansion of the concentration range (5, 10, 20 and 50 mgDOCL(-1)) corroborated the patterns observed on the first assay. Results for the fitness estimates combined with shorter lifespans than controls demonstrated trade-offs between reproductive output and female longevity reared under NR conditions, with NR20 been suggested as the best L. australis cultivation medium. This response might be associated with hormone-like effects. PMID:25025739

  12. Some litholid crabs (Crustacea, Decapoda, Lithodidae) from the Salomon Islands (SW Pacific Ocean) with the description of a new species

    OpenAIRE

    Macpherson, Enrique

    2003-01-01

    Four species of Lithodid crabs from the Solomon Islands were collected during the Solomon 1 cruise carried out off the Solomon Islands. One new species, Paralomis mendagnai, is described and illustrated. Three other species, Neolithodes nipponensis, Paralomis dawsoni and P. haigae, are reported for the first time from these islands. The new species of Paralomis closely resembles P. medipacifica Takeda, 1974, from Midway Islands (Central Pacific) and is characterised by the dorsal surface of t...

  13. Hatching response to temperature along a latitudinal gradient by the fairy shrimp Branchinecta lindahli (Crustacea; Branchiopoda; Anostraca) in culture conditions

    OpenAIRE

    D. Christopher Rogers

    2014-01-01

    Branchinecta lindahli is a broadly distributed fairy shrimp, reported from a range of temporary wetland habitat types in arid western North America. This species’ eggs hatch after the habitat dries, refills from seasonal rain, and receives a strong cold shock during the winter low temperatures. I studied phenotypic variation in temperature responses in cultures collected from four populations across 8° of latitude with low average temperatures ranging from -8 to 8°C. Time to maturation, matur...

  14. Hatching response to temperature along a latitudinal gradient by the fairy shrimp Branchinecta lindahli (Crustacea; Branchiopoda; Anostraca in culture conditions

    Directory of Open Access Journals (Sweden)

    D. Christopher Rogers

    2014-08-01

    Full Text Available Branchinecta lindahli is a broadly distributed fairy shrimp, reported from a range of temporary wetland habitat types in arid western North America. This species’ eggs hatch after the habitat dries, refills from seasonal rain, and receives a strong cold shock during the winter low temperatures. I studied phenotypic variation in temperature responses in cultures collected from four populations across 8° of latitude with low average temperatures ranging from -8 to 8°C. Time to maturation, mature body size and first clutch size decreased, as temperature increased, with only minor body size variability at mortality, regardless of culture origin. No variation in individual egg size was observed, demonstrating that body size is sacrificed to produce at least a few normal eggs during unfavourable years. Latitudinal variation in hatching temperature demonstrated a pattern of adaptive significance, with some overlap between regional temperature hatching cues.  Phenotypic hatching temperature and growth rate responses may cause genetic segregation, selecting one cohort for warmer, dryer years and one cohort for cooler, wetter years.  Drier year selected cohorts can exploit habitats that have shorter hydroperiods even in wet years. This may lead to population specialisation and speciation by adapting to more extreme habitats

  15. Cases of niche-partitioning and of habitat-segregation in pelagic marine calanoids of the genus Euchirella (Crustacea: Copepoda)

    OpenAIRE

    Vaupel Klein, von, J.C.

    1998-01-01

    Two cases of apparent niche-partitioning and one case of alleged habitat-segregation in the calanoid copepod genus Euchirella are described. These are examined with regard to their possible implications for making generalizations about the structure of biocoenoses and about mechanisms of speciation in the pelagic marine environment.

  16. New and little known species of Lepechinella (Crustacea, Amphipoda, Lepechinellidae and an allied new genus Lepesubchela from the North Atlantic

    Directory of Open Access Journals (Sweden)

    Per-Otto Johansen

    2015-06-01

    Full Text Available New species of Lepechinella, L. norvegica sp. nov. and L. victoriae sp. nov., from the North East Atlantic are described together with the new, closely related genus and species Lepesubchela christinae gen. et sp. nov. Lepechinella arctica Schellenberg, 1926 from north of Spitsbergen and Lepechinella schellenbergi Stephensen, 1944 from Greenland are redescribed. A key to the species of Atlantic and Arctic Lepechinella is provided. Descriptions of taxonomic characters from related species in the Atlantic and Arctic are discussed.

  17. Gammaridea and Caprellidea (Crustacea — Amphipoda) of the Portuguese south-western continental shelf: taxonomy and distributional ecology

    NARCIS (Netherlands)

    Marques, João Carlos; Bellan-Santini, Denise

    1991-01-01

    Amphipods from the Portuguese south and south-western continental shelf were studied with regard to the species inventory, distribution, and ecology. This study allowed the identification of 113 species, belonging to 52 genera; of these species 28 are recorded for the first time along the Portuguese

  18. Caprellidae (Crustacea: Peracarida: Amphipoda) from the Red Sea and Suez Canal, with the redescription of Metaprotella africana and Paradeutella multispinosa.

    Science.gov (United States)

    Zeina, Amr F; Guerra-García, José M

    2016-01-01

    The Caprellidae from the Red Sea are reviewed based on the literature data and new collections from the Hurghada coasts. So far, only six valid species has been reported from the Red Sea and Suez Canal: Caprella equilibra Say, 1818, Hemiaegina minuta Mayer, 1890, Metaprotella africana Mayer, 1903, Paracaprella pusilla Mayer, 1890 and Paradeutella multispinosa Schellenberg, 1928 and Pseudocaprellina pambanensis Sundara Raj, 1927. The type material of M. africana (deposited in the Muséum nacional d'Histoire naturelle, Paris) and Paradeutella multispinosa (deposited in the Museum für Naturkunde, Berlin) are redescribed and illustrated in detail. P. pambanensis and H. minuta were the most abundant species in the collections along the northern coast. Most of the sampling effort has been focused on algae from shallow waters; additional substrates such as sediments, hydroids and coral rubble, especially from areas deeper than 15 meters should be explored. The number of caprellid species in the Red Sea is low compared to adjacent waters, as the Mediterranean Sea. However, further research and more extensive caprellid collections should be conducted along the coasts of Saudi Arabia, Yemen, Sudan and Eritrea, which are still unexplored. PMID:27394584

  19. The effects of some domestic pollutants on the cumacean (Crustacea community structure at the coastal waters of the Dardanelles, Turkey

    Directory of Open Access Journals (Sweden)

    A. Suat Ates

    2014-03-01

    Full Text Available This study was carried out to determine the effects of sewage pollution on the cumacean assemblages found in the coastal waters of the Dardanelles. The samples were collected by a SCUBA diver between July 2008 and April 2009 and a total of 102 specimens belong to 5 cumacea species, Bodotria arenosa mediterranea, Cumopsis goodsir, Cumella limicola, Iphinoe maeotica and Pseudocuma longicorne was recorded. The dominant species, Iphinoe maeotica has the highest dominance value (36.66%. Multiregression approach resulted in statistically insignificant relationship between physical, chemical and biochemical variables of water and sediment and Bodotria arenosa mediterranea, Cumopsis goodsir, Cumella limicola, and Iphinoe maeotica. Based on multiple regression test, a significant relationship with R2 = 92.2%, F= 7.876 and p= 0.000 was found between six water and sediment quality constituents and numbers of Pseudocuma longicornis at the stations studied of the Dardanelles. On the other hand, water temperature (β= -0.114; t= -2.811, p= 0.016; sediment organic matter (β= -0.011; t= -2.406; p= 0.033 and water phosphorus (PO4 (β= 0.323; t= 3.444; p=0.005 were found to be the most important water and sediment parameters that affect Pseudocuma longicornis.

  20. Toxicity of antifouling biocides to the intertidal harpacticoid copepod Tigriopus japonicus (Crustacea, Copepoda): Effects of temperature and salinity

    International Nuclear Information System (INIS)

    Intertidal harpacticoid copepods are commonly used in eco-toxicity tests worldwide. They predominately live in mid-high shore rock pools and often experience a wide range of temperature and salinity fluctuation. Most eco-toxicity tests are conducted at fixed temperature and salinity and thus the influence of these environmental factors on chemical toxicity is largely unknown. This study investigated the combined effect of temperature and salinity on the acute toxicity of the copepod Tigriopus japonicus against two common biocides, copper (Cu) and tributyltin (TBT) using a 2 x 3 x 4 factorial design (i.e. two temperatures: 25 and 35 oC; three salinities: 15.0 per mille , 34.5 per mille and 45.0 per mille ; three levels of the biocide plus a control). Copper sulphate and tributyltin chloride were used as the test chemicals while distilled water and acetone were utilised as solvents for Cu and TBT respectively. 96h-LC50s of Cu and TBT were 1024 and 0.149 μg l-1 respectively (at 25 oC; 34.5 per mille ) and, based on these results, nominal biocide concentrations of LC0 (i.e. control), LC30, LC50 and LC70 were employed. Analysis of Covariance using 'concentration' as the covariate and both 'temperature' and 'salinity' as fixed factors, showed a significant interaction between temperature and salinity effects for Cu, mortality increasing with temperature but decreasing with elevated salinity. A similar result was revealed for TBT. Both temperature and salinity are, therefore, important factors affecting the results of acute eco-toxicity tests using these marine copepods. We recommend that such eco-toxicity tests should be conducted at a range of environmentally realistic temperature/salinity regimes, as this will enhance the sensitivity of the test and improve the safety margin in line with the precautionary principle

  1. The cirripede Cretiscalpellum paucistriatum (Crustacea, Thoracica) in the lower Maastrichtian of NW Europe - is it stratigraphically useful?

    OpenAIRE

    Jagt, J.W.M.; van Bakel, B.W.M.

    2007-01-01

    New material of the calanticid cirripede Cretiscalpellum paucistriatum (WOODWARD, 1906) is recorded from the lower Maastrichtian (obtusa Zone) as exposed at the Saturn quarry, Kronsmoor (northern Germany); the carina is described for the first time. These specimens, together with material described previously in the literature, suggest C. paucistriatum to have been a shortlived offshoot of the C. striatum group, apparently confined to the interval from the lower obtusa to the lower sumensis z...

  2. Change in phenotypic plasticity of a morphological defence in Daphnia galeata (Crustacea: Cladocera in a selection experiment

    Directory of Open Access Journals (Sweden)

    Koichi FUJII

    2007-08-01

    Full Text Available Some water fleas Daphnia change their head morphology to reduce predation risk in response to chemical substances (kairomones released from larvae of the invertebrate predator Chaoborus (Insecta: Diptera. We tested for evidence of the costs associated with elongation of the head spine in Daphnia galeata and the consequences of these costs on the inducibility of head spine elongation in predictable and unpredictable environments. We exposed D. galeata in outdoor experimental ponds to conditions under which predation pressure by Chaoborus larvae and the concentration of kairomones from this predator were controlled for about 70 days. In the laboratory, we then used Daphnia clones collected from the outdoor ponds to investigate the inducibility of head spine formation in response to Chaoborus kairomones. The inducibility of head spine formation increased in D. galeata from the ponds that had contained both predators and kairomones, whereas in water fleas from the ponds containing only kairomones the plasticity (inducibility of head spine formation decreased compared with that in the control ponds. These results suggest that the production of a defensive head spine, its phenotypic plasticity, or both entail some costs. Contrary to our predictions, exposure to Chaoborus kairomones in the laboratory resulted in head lengths that were not significantly different among any of the clones from the three outdoor treatments. We found no evidence for costs associated with head spine elongation in terms of fecundity, time to maturity, or intrinsic rate of natural population increase. Average within-clone partial correlations calculated for head length and intrinsic rate of natural population increase, corrected for body length, were not significantly negative, indicating no cost of defence. This was probably because food conditions in the laboratory were so good that the costs of defence could not be detected. Furthermore, community-level changes, such as changes in food conditions caused by manipulation of the predation regime in the outdoor ponds, might have worked as selection pressures and confounded the results.

  3. Identification guide to some Diaptomid species (Crustacea, Copepoda, Calanoida, Diaptomidae of “de la Plata” River Basin (South America

    Directory of Open Access Journals (Sweden)

    Gilmar Perbiche-Neves

    2015-04-01

    Full Text Available An identification guide is presented for species of calanoid copepod family Diaptomidae from “de la Plata” River Basin (Argentina, Brazil, Bolivia, Paraguay and Uruguay. It was based on material collected during the summer and winter of 2010 from 43 sites across the eastern part and the lower stretches of this basin, the second largest in South America and the fourth in the world. The guide contains identification keys and species diagnoses for males and females, richly supported by scanning electronic micrographs and/or line drawings of 19 species. It also includes some general remarks on the taxonomy and phylogenetic relationships of these species. The key was adjusted to be useful for these species only, with separate keys for each sex, and is the first for females of South America. One species classified herein as incertae sedis was not included in the analysis. At least ten other species have previously been recorded in the basin but were not present in our samples. This is the first attempt to compile comprehensive taxonomic information on this group of copepods in this region, and it is expected to become a useful tool for biologists and young taxonomists interested in the crustacean biota of the Neotropical region.

  4. Identification guide to some Diaptomid species (Crustacea, Copepoda, Calanoida, Diaptomidae) of "de la Plata" River Basin (South America).

    Science.gov (United States)

    Perbiche-Neves, Gilmar; Boxshall, Geoffrey Allan; Previattelli, Daniel; Nogueira, Marcos Gomes; da Rocha, Carlos Eduardo Falavigna

    2015-01-01

    An identification guide is presented for species of calanoid copepod family Diaptomidae from "de la Plata" River Basin (Argentina, Brazil, Bolivia, Paraguay and Uruguay). It was based on material collected during the summer and winter of 2010 from 43 sites across the eastern part and the lower stretches of this basin, the second largest in South America and the fourth in the world. The guide contains identification keys and species diagnoses for males and females, richly supported by scanning electronic micrographs and/or line drawings of 19 species. It also includes some general remarks on the taxonomy and phylogenetic relationships of these species. The key was adjusted to be useful for these species only, with separate keys for each sex, and is the first for females of South America. One species classified herein as incertae sedis was not included in the analysis. At least ten other species have previously been recorded in the basin but were not present in our samples. This is the first attempt to compile comprehensive taxonomic information on this group of copepods in this region, and it is expected to become a useful tool for biologists and young taxonomists interested in the crustacean biota of the Neotropical region. PMID:25931959

  5. Identification guide to some Diaptomid species (Crustacea, Copepoda, Calanoida, Diaptomidae) of “de la Plata” River Basin (South America)

    Science.gov (United States)

    Perbiche-Neves, Gilmar; Boxshall, Geoffrey Allan; Previattelli, Daniel; Nogueira, Marcos Gomes; da Rocha, Carlos Eduardo Falavigna

    2015-01-01

    Abstract An identification guide is presented for species of calanoid copepod family Diaptomidae from “de la Plata” River Basin (Argentina, Brazil, Bolivia, Paraguay and Uruguay). It was based on material collected during the summer and winter of 2010 from 43 sites across the eastern part and the lower stretches of this basin, the second largest in South America and the fourth in the world. The guide contains identification keys and species diagnoses for males and females, richly supported by scanning electronic micrographs and/or line drawings of 19 species. It also includes some general remarks on the taxonomy and phylogenetic relationships of these species. The key was adjusted to be useful for these species only, with separate keys for each sex, and is the first for females of South America. One species classified herein as incertae sedis was not included in the analysis. At least ten other species have previously been recorded in the basin but were not present in our samples. This is the first attempt to compile comprehensive taxonomic information on this group of copepods in this region, and it is expected to become a useful tool for biologists and young taxonomists interested in the crustacean biota of the Neotropical region. PMID:25931959

  6. Width-weight relationship and condition factor of Ucides cordatus (Crustacea, Decapoda, Ucididae at tropical mangroves of Northeast Brazil

    Directory of Open Access Journals (Sweden)

    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.

  7. Description of Odontozona addaia spec. nov. (Crustacea: Decapoda: Stenopodidae) from a marine cave in the island of Minorca, western Mediterranean

    NARCIS (Netherlands)

    Pretus, J.L.

    1990-01-01

    Odontozona addaia, a new species of stenopodid shrimp is described from a marine cave in the island of Minorca (Balearic Islands), being the first record of the genus for the western Mediterranean. One male and one ovigerous female were found during a systematic propspection of several Balearic cave

  8. New records of the genus Pachygrapsus (Crustacea: Decapoda from the central Mediterranean Sea with a review of its Mediterranean zoogeography

    Directory of Open Access Journals (Sweden)

    F. CROCETTA

    2012-12-01

    Full Text Available The occurrence of Pachygrapsus maurus and Pachygrapsus transversus is reported from the Maltese Islands for the first time on the basis of one specimen of P. maurus collected in 1990 and numerous recent specimens, and the distribution of the two species is mapped. The controversial presence of P. maurus in Italy is confirmed and two new sites for this species are reported, including the first for the mainland of Italy. The examination of the historical specimen of P. maurus from the Genova area revealed a misidentification of P. transversus; this record could be a result of ship-mediated transport. First notes on the habitat of P. maurus in the central Mediterranean Sea are given. Updated maps of the distribution of P. maurus and P. transversus in the Mediterranean are provided and the zoogeography of these species is revisited.

  9. On the distribution of Percnon gibbesi (H. Milne Edwards, 1853 (Crustacea, Decapoda, Plagusiidae along the Tunisian coast

    Directory of Open Access Journals (Sweden)

    Y.R. SGHAIER

    2012-12-01

    Full Text Available The subtropical crab, Percnon gibbesi is established along the Tunisian coasts. This crab was recorded by underwater observation from Malloula, Tabarka, El-Haouaria, Yasmine Hammamet, Monastir marina and the Kuriat Islands. These new observations increase the known distribution of P. gibbesi in the south Mediterranean basin.

  10. New data on the Tanaidacea (Crustacea: Peracarida) from the Canary Islands, with a description of a new species of Apseudopsis.

    Science.gov (United States)

    Esquete, Patricia; Ramos, Eva; Riera, Rodrigo

    2016-01-01

    Benthic samples from two harbours at El Hierro and Tenerife (Canary Islands) yielded three species of Tanaidacea. Tanais dulongii and Leptochelia savignyi are recorded for the first time in Tenerife and El Hierro, respectively. A new species of Apseudomorpha, Apseudopsis rogi, was collected in both harbours and can be differentiated from other species of the genus by the male having a cheliped merus with a distinctive, cylindrical dorso-proximal spur. This is the first species of Apseudopsis described for the Macaronesian region. A key to the Atlantic and Mediterranean species of Apseudopsis is provided. PMID:27394493

  11. How do fish ectoparasites Argulus spp. (Crustacea: Branchiura) match with their hosts at the behavioural and ecological scales?

    Science.gov (United States)

    Mikheev, V N; Pasternak, A F; Valtonen, E T

    2003-01-01

    Features of the Argulus foliaceus and A. coregoni life cycles including spatial distribution and hatching patterns of the resting eggs as well as their host searching behaviour were analyzed on the basis of field and experimental data obtained in lakes and a fish farm in the Central Finland. Published data on behaviour and ecology of these parasites were also used. The main point of this analysis was an ecological adjustment of the life cycles of parasites to that of their fish hosts at different spatial and temporal scales. Due to different spatial distribution of overwintering eggs, the newly hatched larvae of A. coregoni are more likely to attach to salmonids, which are their main hosts, while A. foliaceus to percids and cyprinids. The main peak of argulid hatching occurs in late spring-early summer and coincides with the period when most of freshwater fishes concentrate close to the shore, either for spawning, or, foraging. Nevertheless, despite the general coincidence, the parasite-host encounter rate could still be very low. The main peak of hatching is followed by a long "tail". We suggest that under fluctuating and uncertain environmental conditions characterised by both abiotic stochasticity and poor predictability of the hosts, an optimal recruitment strategy is to hedge a bet, with a proportion of eggs synchronously hatching and a proportion remaining dormant and hatching at much lower rate during an extended period. One of the main behavioural adaptations to match with the hosts is all-over-the-day searching activity of argulids. The boreal A. coregoni relies primarily on vision, which is most effective in transparent waters during long polar days in summer. Vision is also important in the behavioural repertoire of the temperate A. foliaceus in the light, but olfaction and mechanoreception in the dark provide the highest host searching rate. The two generally sympatric species of argulids segregated on the finer habitat scale. Partially overlapping on salmonid hosts, they prefer ecologically distinct categories of fish, and use different microhabitats for egg laying and searching for hosts. PMID:12815941

  12. Population biology of the burrowing crab Neohelice granulata, (Crustacea: Decapoda: Varunidae) from a tropical mangrove in Brazil

    OpenAIRE

    Rafael A. Gregati; Maria L. Negreiros-Fransozo

    2009-01-01

    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 r...

  13. Comparative study of the sensitivities of neonates and adults of selected cladoceran (Cladocera: Crustacea) species to acute toxicity stress.

    Science.gov (United States)

    Sarma, S S S; Peredo-Alvarez, V M; Nandini, S

    2007-08-01

    The body size differences between neonates and adults of many cladoceran species are large and this influences their susceptibility to toxicants. In this study we quantified the mortality rates based on acute toxicity tests using 7 species of Cladocera (Alona rectangula,Daphnia laevis, D. pulex, D. similis, Ceriodaphnia dubia, Moina macrocopa and Macrothrix triserialis) subjected to stress from methyl parathion (a pesticide) and mercury (a heavy metal). Among the test species, the body size of D. pulex was the largest while that of A. rectangula was the smallest, for both adults and neonates. Regardless of the toxicant, for a given species, neonates were more sensitive than the adults. For mercury, the 24h LC(50) for neonates varied from 5.6 to 16.6 microg/L while for the adults the range was higher (7.6 to 42.5 microg/L); the ratio of LC(50) of neonates to adults of D. laevis was > 3.5, while it was lowest (1.3) for M. triserialis. For methyl parathion, the range of LC(50) for neonates was from 2.5 to 15.6 microg/L, while for the adults it was from 8.2 to 25.9 microg/L. The ratio of LC(50) of neonate to adults was lowest (about 1.1) for C. dubia but was highest (> 5.5) for Alona rectangula. Our study also showed the need to employ a range of cladoceran species for ecotoxicological tests since no single species was consistently sensitive for stress from heavy metal or pesticide. PMID:17680484

  14. Effect of gender on physiological and behavioural responses of Gammarus roeseli (Crustacea Amphipoda) to salinity and temperature

    Energy Technology Data Exchange (ETDEWEB)

    Sornom, Pascal, E-mail: pascal.sornom@umail.univ-metz.f [Universite de Metz, Laboratoire Interactions Ecotoxicologie Biodiversite Ecosystemes (LIEBE), CNRS UMR 7146, Avenue du General Delestraint, 57070 Metz (France); Felten, Vincent, E-mail: vincent.felten@univ-metz.f [Universite de Metz, Laboratoire Interactions Ecotoxicologie Biodiversite Ecosystemes (LIEBE), CNRS UMR 7146, Avenue du General Delestraint, 57070 Metz (France); Medoc, Vincent, E-mail: medoc@univ-metz.f [Universite de Bourgogne, Laboratoire de Biogeosciences, equipe Ecologie Evolutive, CNRS UMR 5561, 6 Bd Gabriel, 21000 Dijon (France); Sroda, Sophie, E-mail: sophie.sroda@umail.univ-metz.f [Universite de Metz, Laboratoire Interactions Ecotoxicologie Biodiversite Ecosystemes (LIEBE), CNRS UMR 7146, Avenue du General Delestraint, 57070 Metz (France); Rousselle, Philippe, E-mail: rousselle@univ-metz.f [Universite de Metz, Laboratoire Interactions Ecotoxicologie Biodiversite Ecosystemes (LIEBE), CNRS UMR 7146, Avenue du General Delestraint, 57070 Metz (France); Beisel, Jean-Nicolas, E-mail: beisel@sciences.univ-metz.f [Universite de Metz, Laboratoire Interactions Ecotoxicologie Biodiversite Ecosystemes (LIEBE), CNRS UMR 7146, Avenue du General Delestraint, 57070 Metz (France)

    2010-05-15

    The importance of potentially interacting factors in organisms responses to a stress are often ignored or underestimated in ecotoxicology. In laboratory experiments we investigated how gender, temperature and age influence the behaviour and the physiology of the freshwater amphipod Gammarus roeseli under salinity stress. Our results revealed a significant higher sensitivity of females in survival, ventilation and ionoregulation whereas no inter-age differences were reported. Water temperature also exerted a significant effect in survival and ventilation of G. roeseli. Some of those factors appeared to interact significantly. This study provides evidence that gender can affect organisms responses to a stressor and consequently has to be considered while assessing a stress impact. We discussed the potential relationships between biological and behavioural responses. - Influence of gender, age and temperature in a gammarid responses to a stress.

  15. Los caprélidos (Crustacea: Amphipoda) del estrecho de Gibraltar y su utilidad como bioindicadores marinos

    OpenAIRE

    Guerra García, José Manuel; Sánchez Moyano, Juan Emilio; García Gómez, José Carlos

    2004-01-01

    Los caprélidos son pequeños crustáceos marinos que viven asociados a algas e invertebrados marinos principalmente. Aunque son fundamentales en las redes tróficas marinas y sirven de alimento a muchas especies de peces, han sido muy poco estudiados. El laboratorio de Biología Marina ha desarrollado en los últimos años un estudio exhaustivo de las comunidades de caprélidos del Campo de Gibraltar. Se han descrito 10 especies nuevas para la ciencia y seis nuevas citas para el estrecho de Gibr...

  16. Observations on feeding behaviour and survival rates in the estuarine calanoid copepods Acartia spinicauda and Heliodiaptomus cinctus (Crustacea: Copepoda: Calanoida)

    Digital Repository Service at National Institute of Oceanography (India)

    Srivastava, Y.; Fernandes, Brenda; Goswami, S.C.; Goswami, U.; Achuthankutty, C.T.

    to feed on T. gracilis (90.08%) as compared to S. costatum (55.87%). A combined feed of Isochrysis galbana (50%) and Chaetoceros sp. (50%) was found to be most satisfactory in case of H. cinctus as there was no mortality till the 8th day and only 57...

  17. A scanning electron microscopy study of Argulus vittatus (Rafinesque-Schmaltz, 1814) (Crustacea: Branchiura) from Algerian coast.

    Science.gov (United States)

    Ider, Djamila; Ramdane, Zouhir; Courcot, Lucie; Amara, Rachid; Trilles, Jean-Paul

    2014-06-01

    A study of the Algerian Branchiura, Argulus vittatus (Rafinesque-Schmaltz, 1814) was conducted using the scanning electron microscopy (SEM). New morphological features are reported for the first time (mouth con, first maxilla, second maxilla, structures and ornamentation of thoracic segments, structure of semen papillae, etc.). The morphology of small and large female specimens was compared. Two new hosts, Pagellus erythrinus L. and Sparus aurata L., are reported for this species. Until now, six host species were reported for A. vittatus, and stenoxenic specificity for Sparid fishes was observed for Algerian specimens. The biogeographical distribution of this species seems to be restricted to the eastern coast of Algeria. Additional information about the host specificity, ecology, and life cycle of this parasitic species were given. PMID:24728522

  18. Description of a New Mangrove Root Dwelling Species of Teleotanais (Crustacea: Peracarida: Tanaidacea) from India, with a Key to Teleotanaidae

    Digital Repository Service at National Institute of Oceanography (India)

    Larsen, K.; Sahoo, G.; Ansari, Z.A.

    Tanaidaceans collected from mangrove pneumatophores on the west coast of India included females and mancae of a new species of the rare and plesiomorphic family Teleotanaidae, described herein as Teleotanais indiaensisi sp. nov. A key to the species...

  19. Descriptions of Indoerythrops typicus gen. nov., sp. nov. and Pleureythrops inscita new record from Indian waters (Crustacea: Mysidacea)

    Digital Repository Service at National Institute of Oceanography (India)

    Panampunnayil, S.U.

    Descriptions of Indoerythrops typicus, new genus and new species, and Pleurerythrops inscita, new record, from Indian waters are given. The new genus is distinguishable from the allied genera of the tribe Erythropini in having modified setae...

  20. Tissue specific structural variations of mitochondria of fish ectoparasite Argulus bengalensis Ramakrishna, 1951 (Crustacea: Branchiura: Functional implications

    Directory of Open Access Journals (Sweden)

    Anirban Banerjee

    2014-05-01

    Full Text Available We studied the fine structure of some classical and six variant mitochondria from different tissues viz. proboscis gland, spinal gland, ovary, testis, and muscle of a fish ectoparasite, Argulus bengalensis. In the proboscis gland and spinal gland, mitochondria are protected within vesicle to preserve their structure and activity from exposure to glandular synthesis for its parasitic mode of feeding. In the oocytes, mitochondria are larger and cylindrical in appearance. Oocyte mitochondria are highly dynamic and exhibit frequent fission and fusion. Those are clustered in the cytoplasm of previtellogenic oocytes which prepare for different synthetic activities for successful reproductive investment. In contrast, mitochondrial abundance is less in the male gametic lineage. The spermatocytes and the nurse cells in the testis have an unusual type of mitochondria, nebenkern which is formed by the fusions of number of mitochondria. A completely different type of mitochondrion is discovered in the flagellum of the spermatozoa. It is provided with fifteen numbers of singlet microtubules at its outer periphery which is a salient feature of the flagellum of this Branchiuran genus. This unique mitochondrion uses the microtubule tract for its movement to distribute energy efficiently along the axoneme. Such mitochondrion and microtubular association provide evidence in favor of phylogenetic relationship between Argulus and pentastomid Raillietiella. In striated muscle of thoracic appendages, mitochondria maintain tight junctions with the endoplasmic reticulum and remain in close apposition of the myofibrils which helps in Ca2+ uptake for stimulating continuous muscular activity required for ventilation of respiratory structures of the parasites.

  1. Faunal diversity of Cladocera (Crustacea: Branchiopoda in wetlands of Majuli (the largest river island, Assam, northeast India

    Directory of Open Access Journals (Sweden)

    Sharma, B. K.

    2014-06-01

    Full Text Available Our collections from the wetlands of Majuli, the largest river island of the world and a unique fluvial landform of the Brahmaputra river basin of northeast India, reveal 55 Cladocera species belonging to 36 genera. These represent ~46.0% and ~79.0% of the freshwater species and genera of the taxon known from India, respectively. The Indo-Chinese Alona kotovi is new record from India and the Indo-Chinese Chydorus angustirostris is new to northeast India. The Australasian Disperalona caudata, the Indo-Chinese Alona cheni, and the Oriental Celsinotum macronyx and Kurzia (Rostrokurzia brevilabris are other biogeographically notable elements while several species are of regional interest. The speciose and diverse Cladocera reflect habitat diversity and environmental heterogeneity of the sampled ecosystems. The fauna records rich diversity of the littoral-periphytonic taxa in general and the Chydoridae in particular. Majuli Cladocera is characterized by lack of Leydigiopsis, Daphnia spp. and Acroperus harpae; fewer Diaphanosoma spp., and uncommon occurrence of the Bosminidae and Moinidae as compared with our samples elsewhere from the floodplains of the Brahmaputra basin.

  2. Niphargus plurispinosus sp. n. (Crustacea, Amphipoda, a stygophile and hypotelminorheic representative from Central Europe

    Directory of Open Access Journals (Sweden)

    Igor Hudec

    2014-06-01

    Full Text Available The detailed description of the morphology of Niphargus plurispinosus sp. n. from Slovakia is presented. Over 300 specimens were collected from a permanent seepage spring on repeated visits between May 2011 and May 2013. The type locality is located in the foothills of the Zemplínske vrchy mountains in the East Slovakian Lowland (NE part of Pannonian Lowland - small, low and isolated hills formed during Neogene volcanic activity. Volcanic rocks draw together fragments of massives of Palaezoic and Mesozoic age as same as Neogene sediments. The new species can be classified as stygophile, living in the shallow subterranean habitat. The species has small subequal gnathopods, sexually dimorphic uropod III, sexually non-dimorphic uropod I in juveniles, dimorphic uropod 1 in adults. They are extremely different in the post-reproductive stage, when they have 2-4 dorsal spines (arranged in a transverse row on the telson and supporting dorsal spines.

  3. Platycuma bamberconfabulor sp. nov. (Crustacea: Cumacea: Nannastacidae) from Antarctica, with a note on the gut of Platycuma.

    Science.gov (United States)

    Gerken, Sarah; Watling, Les

    2015-01-01

    Platycuma bamberconfabulor sp. nov. is based on a specimen from the Ross Sea. The species can be distinguished from the other species in the genus through the combination of a laterally expanded and somewhat dorsoventrally flattened carapace, anterior margin of the carapace excavate in dorsal view, uropod peduncles less than twice as long as pleonite 6, and subequal pleonites 4 and 5. PMID:26250309

  4. 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.

  5. Role of salinity on food conversion efficiency and growth in juvenile penaeid shrimp Metapenaeus dobsoni (Crustacea/Arthropoda)

    Digital Repository Service at National Institute of Oceanography (India)

    Fernandes, Brenda; Achuthankutty, C.T.

    Growth parameters of juvenile Metapenaeus dobsoni, fed with fresh squid meat were estimated in 5, 15, 25 and 35 ppt salinities for 4 weeks. Although no significant differences were noticed in food ingestion rates, higher body weight (68.9% over...

  6. Caracterization de las trypsinas y amilasas de Penaeus vannamei (crustacea decapoda) : adaptacion a la composicion deln regimen alimenticio

    OpenAIRE

    Van Wormhoudt, Alain; Le Moullac, Gilles; Klein, Birgit; Sellos, Daniel

    1999-01-01

    Las tripsinas, entre las proteasas, y las amilasas, entre las carbohidrasas, son las enzimas más activas en Penaeus vannamei, un camarón de interés comercial, especialmente en Latinoamérica. Estas enzimas y sus cDNAS fueron caracterizados. En lo que respecta a las tripsinas, se reconocieron cinco isoformas y se analizaron sus cDNAs correspondientes, los cuales codifican una preproenzima de 225 aminoácidos conteniendo un supuesto precursor peptídico de 14 residuos y una secuencia señal alta...

  7. 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.

  8. Reproductive features of the deep-water rose shrimp, Parapenaeus longirostris (Crustacea: Penaeidae, in the Strait of Sicily

    Directory of Open Access Journals (Sweden)

    M.L. BIANCHINI

    2012-12-01

    Full Text Available The deep‑water rose shrimp, Parapenaeus longirostris (Lucas, 1846, is one of the most valuable and heavily exploited demersal species of the Mediterranean bottom trawl fisheries. The basic life traits of this shrimp, in particular its reproductive aspects, are regularly monitored during experimental trawl surveys carried out in the Mediterranean Sea. Gonadic condition and maturity status for estimating the size at onset of sexual maturity are commonly assessed in females, using macroscopic color scales, histologically validated only in a few geographical areas. In this study, histological analyses were performed on rose shrimps collected from a trawl survey carried out in the Strait of Sicily, in order to support the empirical 4‑stage macroscopic scale locally employed. Ovaries from females of different sizes, ranging between 16 mm and 40 mm carapace length, were collected and used for microscopic examination of their structure, for oocytes counts and for oocyte diameter frequency distributions; oocytes diameter was measured by imaging analysis. The collected data were also used to estimate other basic vital parameters of the rose shrimp population. The histological observations show a broad correspondence between ovarian development and macroscopic features; therefore, the classifications derived by the empirical scale remain suitable for estimating the maturity parameters.

  9. Potential exposure routes and accumulation kinetics for poly- and perfluorinated alkyl compounds for a freshwater amphipod: Gammarus spp. (Crustacea).

    Science.gov (United States)

    Bertin, Delphine; Labadie, Pierre; Ferrari, Benoît J D; Sapin, Alexandre; Garric, Jeanne; Geffard, Olivier; Budzinski, Hélène; Babut, Marc

    2016-07-01

    Gammarids were exposed to sediments from a deposition site located on the Rhône River (France) downstream of a fluoropolymer manufacturing plant. Gammarids accumulated to various extents four long-chain perfluoroalkyl carboxylic acids (PFCAs) from C9 to C13, one sulfonate, perfluorooctane sulfonate (PFOS) and three of its precursors (the perflurooctane sulfonamide (FOSA), the N-methyl perfluorooctane sulfonamidoacetic acid (MeFOSAA), the N-ethyl perfluorooctane sulfonamidoacetic acid (EtFOSAA) and the 6:2 fluorotelomer sulfonic acid (6:2 FTSA). Whatever the compound, the steady state was not achieved after a 3-week exposure; elimination was almost complete after a 3-week depuration period for perfluorononanoic acid (PFNA), PFOS, the three precursors and the 6:2FTSA. However, this was not the case for long-chain PFCAs, whose elimination rates decreased with increasing chain length. PFAS accumulation in gammarids occurred via the trophic and respiratory pathways, in proportions varying with the carbon chain length and the terminal moiety. PMID:27139118

  10. 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.

  11. Utilization of adult burrows by juveniles of the ghost shrimp, Callianassa japonica Ortmann: evidence from resin casts of burrows

    Digital Repository Service at National Institute of Oceanography (India)

    Tamaki, A.; Ikebe, K.; Muramatsu, K.; Ingole, B

    stream_size 9 stream_content_type text/plain stream_name Res_Crustacea_21_113.pdf.txt stream_source_info Res_Crustacea_21_113.pdf.txt Content-Encoding ISO-8859-1 Content-Type text/plain; charset=ISO-8859-1 ...

  12. The Isopoda and Tanaidacea of the Netherlands, including the description of a new species of Limnoria

    NARCIS (Netherlands)

    Holthuis, L.B.

    1949-01-01

    The Isopod and Tanaidacean Crustacea of the Netherlands have not been treated as a whole since 1889, when Hoek published the second part of his Crustacea Neerlandica dealing with the Isopoda and Amphipoda. Hoek in this paper mentioned 25 species of Isopoda, 9 of which are marine forms, 1 a freshwate

  13. Hábitats esenciales de condrictios (Chondrichthyes) costeros, y su relación con los procesos oceanográficos.

    OpenAIRE

    Cortés, F.

    2012-01-01

    The relationship between environmental variables (depth, temperature and salinity) and the abundance of sharks (Mustelus schmitti and Squatina guggenheim) and skates (Sympterygia bonapartii, Rioraja agassizi and Atlantoraja castelnaui) was analyzed in the Southwestern Atlantic coastal waters (between 34~'S and 42~'S at depths of less than 50 m from the coast line). Data were collected during research Cruises carried out by the National Institute of Fisheries Research and Development (INIDEP)...

  14. Biología de los camarones Peneidos del manglar de Guadalupe

    OpenAIRE

    Rojas-Beltrán, Ricardo

    1981-01-01

    Durante el desarrollo de dos campañas preliminares en 1976 hemos podido recolectar ocho especies de Peneidos en el manglar de Guadalupe. Las citaremos en orden de importancia: Penaeus (Melicerlus) aztecus subtilis, P. (M.) brasiliensis, P. (M.) duorarum notialis, P. (Litopenaeus) schmitti, Trachypenaeus similis similis, T. constrictus, Sicyonia wheeleri y S. laevigata. De éstas ocho especies las cuatro primeras presentan un gran interés comercial y las seis últimas se citan por primera vez pa...

  15. Further observations on zooplankton of the Potengi Estuary (Natal, Rio Grande do Norte, Brazil with special reference to the larvae of Brachyura (Crustacea, Decapoda

    Directory of Open Access Journals (Sweden)

    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.

  16. Fluctuaciones estacionales y ciclos de vida de los anfípodos [crustacea : peracarida : amphipoda] del Estrecho de Gibraltar aplicaciones en acuicultura

    OpenAIRE

    Baeza-Rojano Pageo, Elena

    2013-01-01

    Esta memoria versa sobre las fluctuaciones naturales y los ciclos de vida bajo condiciones controladas de las especies de anfípodos más representativas del sur de la Península Ibérica, así como de sus posibles aplicaciones en la acuicultura. Los anfípodos

  17. Infestation pattern and parasitic castration of the crustacean Riggia paranensis (Crustacea: Cymothoidea on the fresh water fish Cyphocharax gilbert (Teleostei: Curimatidae

    Directory of Open Access Journals (Sweden)

    Juliana de Souza Azevedo

    2006-09-01

    Full Text Available Cyphocharax gilbert infested by Riggia paranensis shows parasitic castration. The prevalence of parasitism in C. gilbert varied among different environments, being higher in the middle rio Itabapoana. Fish were collected monthly using two cast nets (thrown 30 times during the day and gillnets kept in the river during 12 hour, from sunset to sunrise, between September 1997 and August 2000. Infestation pattern was investigated on 1358 specimens. Most of them were infested (57.9%, with one or two parasites; the majority (62.9% was collected during the rainy season (spring-summer. The parasite did not show preference for sex or size of hosts. A total of 91.5% of the 511 examined parasites had a body size that represented 10.1% to 20% of host standard length. The reproductive condition of 311 specimens of R. paranensis was analyzed checking the presence of oocytes in the ovarian and eggs or embryos in the marsupium. Nearly 73% of them were at reproductive phase, and had a body size that represented 5.1% to 20% of host standard length. The size of the immature parasites varied from 0.1% to 5% of the host size. The results suggest that R. paranensis may adopt a fast growth rate strategy and increase the investment in reproduction when they occupy most of the host's pericardial space.Cyphocharax gilbert infestado por Riggia paranensis apresenta castração parasitária. A prevalência do parasito varia entre diferentes ambientes, sendo maior no trecho médio do rio Itabapoana. Os peixes foram coletados mensalmente neste rio usando duas tarrafas (lançadas por 30 vezes durante o dia e redes de espera por 12 horas, do crepúsculo ao amanhecer, entre setembro de 1997 e agosto de 2000. O padrão de infestação foi investigado em 1358 peixes. Peixes infestados apresentaram um ou dois parasitos, representando 57,9% da população e a maioria deles (62,9% foi coletada no período de maior precipitação (primavera-verão. O parasito não apresentou preferência por sexo ou tamanho do hospedeiro. No total, 91,5% de 511 parasitos examinados apresentaram um tamanho corpóreo que representou de 10,1% a 20% do comprimento padrão do hospedeiro. A condição reprodutiva em 311 espécimes R. paranensis foi analisada através da presença de oócitos no ovário e ovos ou embriões no marsúpio, sendo que cerca de 73% estavam em fase de reprodução, apresentando um tamanho corporal que variou entre 5,1% a 20% do comprimento padrão do hospedeiro. O tamanho dos parasitos imaturos variou de 0,1% a 5% do tamanho do hospedeiro. Os resultados sugerem que R. paranensis pode adotar uma estratégia de rápido crescimento e deve aumentar o investimento em reprodução quando ocupa grande parte do espaço disponível na cavidade pericardial do hospedeiro.

  18. 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.

  19. Natural diet of the spiny lobster, Panulirus echinatus Smith, 1869 (Crustacea: Decapoda: Palinuridae), from São Pedro and São Paulo Archipelago, Brazil.

    Science.gov (United States)

    Góes, C A; Lins-Oliveira, J E

    2009-02-01

    The natural diet of the spiny lobster (Panulirus echinatus) from the São Pedro and São Paulo Archipelago was determined by stomach contents analysis of sixty-eight adult lobsters collected during October 2002, March, July and August 2003. Food items were grouped by gross taxa representing 11 food categories. Analysis included a qualitative (Frequency of Occurrence of item i--FOi) and a quantitative method (Volume of item i--Vi). A Feed Index (FI = FOi x Vi / 100) proposed by Lauzanne (1975) was also used to indicate the importance of each food category (> 50: dominant, 25-50: essential, 10-25: unimportant, algae, calcareous algae, and rocks. The remaining food categories contributed to less than 30% of FOi and 10% of Vi. Although the Feed Index revealed no dominant food category in the diet of P. echinatus, fish was considered essential, crustaceans unimportant, and the remaining food categories were classified as secondary. According to the analysis, P. echinatus can be properly classified as an omnivorous and a generalist species, because it consumes a great diversity of organisms in several trophic levels. This species presents an opportunistic behaviour, feeding on the prey available at substratum. Future studies should address variations in natural diet related to sex, reproductive cycle, and seasonality. PMID:19347157

  20. Les crustacés de La Réunion (Crustacea, Decapoda) dans la zone marine du Piton de la Fournaise

    OpenAIRE

    Poupin, Joseph; Quod, Jean-Pascal; Zubia, Mayalen; Bollard, Stéphanie; Barrère, Alain; Magalon, Hélène

    2013-01-01

    Les crustacés décapodes récoltés dans la zone marine située au pied du volcan du Piton de la Fournaise à La Réunion, entre 0-800 m, sont étudiés à partir de récoltes faites en plongées (0-80 m) ou aux casiers (300-800 m). Au total 69 espèces sont reconnues. Dix huit de ces espèces sont signalées pour la première fois à La Réunion, dont 12 déterminées avec certitude : Anapagrides reesei, Carupella natalensis, Coralliocryptus caementa, Dardanus pedunculatus, Lophozozymus pulchellus, Lybia plumo...

  1. A new species of Halacarsantia Wolff, 1989 (Crustacea, Isopoda, Asellota, Santiidae from Wistari Reef, southern Great Barrier Reef, Australia

    Directory of Open Access Journals (Sweden)

    Michitaka Shimomura

    2012-03-01

    Full Text Available Halacarsantia acuta sp. n. is described from Wistari Reef, Capricorn Group, southern Great Barrier Reef, the first record of the genus from Australia. The new species differs from its congeners inantenna flagellum composed of 8 articles; epipod apically acute, without setae, broad maxilliped endite and pereopod 1 basis with a short projection. A key to species of the genus is provided.

  2. A new species of Numbakullidae Guţu & Heard, 2002 (Tanaidacea, Peracarida, Crustacea from the Great Barrier Reef, Australia

    Directory of Open Access Journals (Sweden)

    Anna Stępień

    2013-10-01

    Full Text Available A new species of Numbakulla Guţu & Heard, 2002 (Tanaidacea is described from Heron Island (southern Great Barrier Reef, Queensland collected during the Census of Coral Reefs Ecosystem (CReefs program. The new species is the third member of the family and can be recognized by the combination of characters as: length/width ratio of the body, which is 6:7, pereonite 4 longer than the rest, the presence of eyes, a blunt rostrum, antenna article 2 elongated, cheliped carpus with row of inner setae, pereopod 6 carpus with spines, pleopod endopod with denticles.

  3. Host-parasite interactions between the piranha Pygocentrus nattereri (Characiformes: Characidae and isopods and branchiurans (Crustacea in the rio Araguaia basin, Brazil

    Directory of Open Access Journals (Sweden)

    Lucélia Nobre Carvalho

    2004-06-01

    Full Text Available In the tropics, studies on the ecology of host-parasite interactions are incipient and generally related to taxonomic aspects. The main objective of the present work was to analyze ecological aspects and identify the metazoan fauna of ectoparasites that infest the piranha, Pygocentrus nattereri. In May 2002, field samples were collected in the rio Araguaia basin, State of Goiás (Brazil. A total of 252 individuals of P. nattereri were caught with fishhooks and 32.14% were infested with ectoparasite crustaceans. The recorded ectoparasites were branchiurans, Argulus sp. and Dolops carvalhoi and the isopods Braga patagonica, Anphira branchialis and Asotana sp. The prevalence and mean intensity of branchiurans (16.6% and 1.5, respectively and isopods (15.5% and 1.0, respectively were similar. Isopods were observed in the gills of the host; branchiurans were more frequent where the skin was thinner, and facilitated attachment and feeding. The ventral area, the base of the pectoral fin and the gular area were the most infested areas. The correlations between the standard length of the host and the variables intensity and prevalence of crustaceans parasitism, were significant only for branchiurans (rs = 0.2397, p = 0.0001; chi2 = 7.97; C = 0.19. These results suggest that both feeding sites and body size probably play an important role in the distribution and abundance of ectoparasites.Nos trópicos, os estudos sobre a ecologia de interações parasito-hospedeiro são incipientes, sendo a maioria de cunho taxonômico. O principal objetivo do presente estudo foi identificar a fauna metazoária de ectoparasitas e analisar aspectos ecológicos da piranha Pygocentrus nattereri. As coletas foram realizadas em maio de 2002, na bacia do rio Araguaia, GO. Com o auxílio de linha e anzol foram capturados 252 exemplares de P. nattereri, dos quais 32,14% estavam infestados por crustáceos ectoparasitos. As espécies de ectoparasitas registradas foram Argulus sp. e Dolops carvalhoi (Branchiura e Braga patagonica, Anphira branchialis e Asotana sp. (Isopoda. A prevalência e a intensidade média de branquiúros (16,6% e 1,5, respectivamente e isópodos (15,5% e 1,0, respectivamente foram similares. Isópodos foram observados nas brânquias do hospedeiro; os branquiúros foram mais freqüentes na região ventral, base da nadadeira peitoral e região gular. Nessas áreas, a pele é mais fina, facilitando a fixação e alimentação do parasita. As correlações entre o comprimento padrão do hospedeiro e as variáveis intensidade e prevalência de parasitismo foram significativas apenas para branquiúros (rs= 0, 2397, p= 0,0001; chi2 = 7,97; C= 0, 19, respectivamente. Os resultados sugerem que os sítios de alimentação e o tamanho corporal dos ectoparasitos provavelmente têm um papel importante na sua distribuição e abundância.

  4. Survival, growth and feeding rate of the mysid Neomysis integer (Crustacea: Mysidacea) on laboratory-made estuarine aggregates

    OpenAIRE

    Fockedey, N.; Hermans, S.; Mees, J.; Vincx, M.

    2005-01-01

    Laboratory-generated aggregates (flocs) made from natural estuarine water of the oligohaline part of the Schelde estuary (Belgium) were administered to the brackish water mysid Neomysis integer in order to determine their value as a dietary item. Survival, growth, intermoult period, growth factor and intermoult growth rate of subadult mysids (4 - 10 mm standard length) were monitored over 4.5 weeks in a roller table. In a first experiment, the effect of tidal dynamics on the floc formation pr...

  5. Cherax (Astaconephrops) pulcher, a new species of freshwater crayfish (Crustacea, Decapoda, Parastacidae) from the Kepala Burung (Vogelkop) Peninsula, Irian Jaya (West Papua), Indonesia.

    Science.gov (United States)

    Lukhaup, Christian

    2015-01-01

    A new species, Cherax (Astaconephrops) pulchersp. n., from Hoa Creek, close to the village Teminabuan in the southern-central part of the Kepala Burung (Vogelkop) Peninsula, West Papua, Indonesia, is described, figured and compared with the morphologically closest species, Cheraxboesemani Lukhaup & Pekny, 2008. PMID:26019660

  6. Cherax snowden, a new species of crayfish (Crustacea, Decapoda, Parastacidae) from the Kepala Burung (Vogelkop) Peninsula in Irian Jaya (West Papua), Indonesia.

    Science.gov (United States)

    Lukhaup, Christian; Panteleit, Jörn; Schrimpf, Anne

    2015-01-01

    A new species, Cherax snowden sp. n., from the Oinsok River Drainage, Sawiat District in the central part of the Kepala Burung (Vogelkop) Peninsula, West Papua, Indonesia, is described, figured and compared with the closest related species, Cherax holthuisi Lukhaup & Pekny, 2006. This species is collected and exported for ornamental purposes and its commercial name in the pet trade is "orange tip" or "green orange tip". Both species may be easily distinguished morphologically or by using sequence divergence, which is substantial, for considering Cherax snowden sp. n. to be a new species. PMID:26448698

  7. Cherax (Astaconephrops pulcher, a new species of freshwater crayfish (Crustacea, Decapoda, Parastacidae from the Kepala Burung (Vogelkop Peninsula, Irian Jaya (West Papua, Indonesia

    Directory of Open Access Journals (Sweden)

    Christian Lukhaup

    2015-05-01

    Full Text Available A new species, Cherax (Astaconephrops pulcher sp. n., from Hoa Creek, close to the village Teminabuan in the southern-central part of the Kepala Burung (Vogelkop Peninsula, West Papua, Indonesia, is described, figured and compared with the morphologically closest species, Cherax boesemani Lukhaup & Pekny, 2008.

  8. 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

    mandibles, the movement pattern gets increasingly stereotypical, with the mandibles performing but a single movement in a medio-lateral plane. From morphology, the mouthparts are subdivided into 20 parts, but from the functional analyses the 20 parts form 8 functional groups: 1, transporting mouthparts...... (maxilliped 2 endopod and maxilliped 3 endopod); 2, transporting-aligning mouthparts (maxilliped 1 basis); 3, sorting-aligning mouthparts (maxilla 1 basis and maxilla 2 basis); 4, current-generating mouthparts (flagella of maxilliped 2 and maxilliped 3 exopods); 5, cutting-crushing mouthparts (incisor and...

  9. Adaptation of digestive enzymes to dietary protein, carbohydrate and fibre levels and influence of protein and carbohydrate quality in Penaeus vannamei larvae (Crustacea, Decapoda)

    OpenAIRE

    Le Moullac, Gilles; Van Wormhoudt, Alain

    1994-01-01

    L'activité des enzymes digestives (trypsine, chymotrypsine et amylase) au cours des premiers stades larvaires de Penaeus vannamei est étudiée en relation avec l'alimentation. Les microparticules à base de caséine diminuent le contenu protéique soluble et les activités enzymatiques. L'activité spécifique de la trypsine est corrélée (p

  10. Global diversity and phylogeny of pelagic shrimps of the former genera Sergestes and Sergia (Crustacea, Dendrobranchiata, Sergestidae), with definition of eight new genera.

    Science.gov (United States)

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

    2014-01-01

    We revise the global diversity of the former genera Sergia and Sergestes which include 71 valid species. The revision is based on examination of more than 37,000 specimens from collections in the Natural History Museum of Denmark and the Museum of Natural History, Paris. We used 72 morphological characters (61 binary, 11 multistate) and Sicyonella antennata as an outgroup for cladistic analysis. There is no support for the genera Sergia and Sergestes as they have been defined until now. We define and diagnose eight genera of the former genus Sergia (Sergia and new genera Gardinerosergia, Phorcosergia, Prehensilosergia, Robustosergia, Scintillosergia, Challengerosergia, and Lucensosergia) and seven genera of the former genus Sergestes (Sergestes, Deosergestes, Eusergestes, Allosergestes, Parasergestes, Neosergestes, and a new genus Cornutosergestes). An identification key is presented for all genera of the family Sergestidae. The phylogeny of Sergestidae is mainly based on three categories of characters related to: (1) general decapod morphology, (2) male copulatory organs, and (3) photophores. Only simultaneous use of all three character types resulted in a resolved tree with minimal Bootstrap support 75 for each clade. Most genera are interzonal mesopelagic migrants, some are benthopelagic (Scintillosergia, Lucensosergia), bathypelagic (Sergia), or epipelagic (Cornutosergestes). Within each of meso- and benthopelagic genera there is one species with panoceanic distribution, while most species ranges are restricted to a single ocean. The genera demonstrate two different strategies expressed both in morphology and behavior: protective (Eusergestes, Sergestes, Cornutosergestes, Prehensilosergia, Scintillosergia, Lucensosergia, Challengerosergia, Gardinerosergia, Robustosergia, Phorcosergia, Sergia) and offensive (Neosergestes, Parasergestes, Allosergestes, Deosergestes). PMID:25409458

  11. Global diversity and phylogeny of pelagic shrimps of the former genera Sergestes and Sergia (Crustacea, Dendrobranchiata, Sergestidae, with definition of eight new genera.

    Directory of Open Access Journals (Sweden)

    Alexander L Vereshchaka

    Full Text Available We revise the global diversity of the former genera Sergia and Sergestes which include 71 valid species. The revision is based on examination of more than 37,000 specimens from collections in the Natural History Museum of Denmark and the Museum of Natural History, Paris. We used 72 morphological characters (61 binary, 11 multistate and Sicyonella antennata as an outgroup for cladistic analysis. There is no support for the genera Sergia and Sergestes as they have been defined until now. We define and diagnose eight genera of the former genus Sergia (Sergia and new genera Gardinerosergia, Phorcosergia, Prehensilosergia, Robustosergia, Scintillosergia, Challengerosergia, and Lucensosergia and seven genera of the former genus Sergestes (Sergestes, Deosergestes, Eusergestes, Allosergestes, Parasergestes, Neosergestes, and a new genus Cornutosergestes. An identification key is presented for all genera of the family Sergestidae. The phylogeny of Sergestidae is mainly based on three categories of characters related to: (1 general decapod morphology, (2 male copulatory organs, and (3 photophores. Only simultaneous use of all three character types resulted in a resolved tree with minimal Bootstrap support 75 for each clade. Most genera are interzonal mesopelagic migrants, some are benthopelagic (Scintillosergia, Lucensosergia, bathypelagic (Sergia, or epipelagic (Cornutosergestes. Within each of meso- and benthopelagic genera there is one species with panoceanic distribution, while most species ranges are restricted to a single ocean. The genera demonstrate two different strategies expressed both in morphology and behavior: protective (Eusergestes, Sergestes, Cornutosergestes, Prehensilosergia, Scintillosergia, Lucensosergia, Challengerosergia, Gardinerosergia, Robustosergia, Phorcosergia, Sergia and offensive (Neosergestes, Parasergestes, Allosergestes, Deosergestes.

  12. Global Diversity and Phylogeny of Pelagic Shrimps of the Former Genera Sergestes and Sergia (Crustacea, Dendrobranchiata, Sergestidae), with Definition of Eight New Genera

    OpenAIRE

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

    2014-01-01

    We revise the global diversity of the former genera Sergia and Sergestes which include 71 valid species. The revision is based on examination of more than 37,000 specimens from collections in the Natural History Museum of Denmark and the Museum of Natural History, Paris. We used 72 morphological characters (61 binary, 11 multistate) and Sicyonella antennata as an outgroup for cladistic analysis. There is no support for the genera Sergia and Sergestes as they have been defined until now. We de...

  13. Composition and distribution of Munnopsidae (Crustacea, Isopoda, Asellota), collected during the KuramBio expedition 2012 from the Kuril-Kamchatka Trench area

    Science.gov (United States)

    Malyutina, Marina V.; Brandt, Angelika

    2015-01-01

    The abyssal macrobenthos of the Kuril-Kamchatka Trench (KKT) area was sampled for the first time using a fine-meshed camera-epibenthic sledge (C-EBS) during the German-Russian KuramBio expedition 2012 (RV Sonne, 223 cruise). Crustaceans of the order Isopoda were one of the dominant macrobenthic taxa, and the family Munnopsidae was the most abundant and diverse among 17 collected asellotan families, comprising about 48% of all isopods. During the KuramBio expedition no less than 80 species of 28 genera and eight subfamilies of Munnopsidae were collected with 21 EBS hauls at 12 stations. About 80% species are new to science and half of the genera and the subfamily Lipomerinae are recorded for the first time in the Northwest Pacific. The most abundant and speciose subfamily was Eurycopinae (58% of all specimens and 29 % of species), followed by Ilyarachninae (12% and 16%). Most species are rare and occur with low abundance at one or few stations. Ten most numerous species belonging to the genera Eurycope (5 species), Microcope (2), Disconectes (1), Ilyarachna (1) and Aspidarachna (1) comprised 68% of all munnopsids. The species Eurycope sp.1 and Microcope ovata (Birstein, 1970) were the most abundant and frequent species, occurring at all stations. The highest abundance of Munnopsidae and high diversity, with 32 species, occurred at station 3-9 on the western slope of the KKT. The cluster analysis of the Bray-Curtis similarity shows a low similarity between stations. The least similar was station 1-10, with only 26% similarity with other stations. Low similarity also characterized station 3-9 (34%). The comparison with known data revealed differences in species composition of Munnopsidae of the abyssal plain of the KKT area and the fauna of adjacent bathyal and hadal zones. Similar ratios of the munnopsid subfamilies and genera and some similar species have been revealed for the KuramBio and ANDEEP areas.

  14. Two new species of Vestrogothia (Phosphatocopina,Crustacea) of Orsten-type preservation from the Upper Cambrian in western Hunan,South China

    Institute of Scientific and Technical Information of China (English)

    ZHANG HuaQiao; DONG XiPing

    2009-01-01

    Although fossils of Orsten-type preservation represented by Skaracarida and Phosphatocopina were first reported from the Middle and Upper Cambrian in western Hunan,South China in 2005,diversified phosphatocopine species have never been appropriately described and elucidated in terms of their evolutionary relationships.Here,we described two new species of Phosphatocopina,Vestrogothia anterispinata sp.nov.and V.bispinata sp.nov.The evolutionary relationship among all the valid spe-cies of Phosphatocopina is discussed and the phylogeny of Phosphatocopina is reestablished using cladistic analysis.Accordingly,phosphatocopines primitively evolved along two lineages:one evolved towards the emergence of lobes; the other evolved towards the emergence of dorsal spines.Respec-tively,lobes originated independently three times,and dorsal spines originated only once.With regard to the dorsal rims,interdorsum originated first,whereas dorsal furrow originated independently twice on the basis of interdorsum.Probably Hesslandona may represent a polyphyletic group,whereas Vestrogothia a monophyletic group.

  15. The genus Perissocytheridea Stephenson, 1938 (Crustacea: Ostracoda) and evidence of brackish water facies along the Oligo-Miocene, Pirabas Formation, eastern Amazonia, Brazil

    Science.gov (United States)

    Evangelista Nogueira, Anna Andressa; Ramos, Maria Inês Feijó

    2016-01-01

    Perissocytheridea Stephenson is characteristic of brackish water facies. In 57 samples from the Upper Oligocene to Lower Miocene, from five localities, Pirabas Formation, Pará State, Brazil eleven species have been identified. Among these species, four are new reports: Perissocytheridea punctoreticulata n. sp., Perissocytheridea largulateralis n. sp., Perissocytheridea colini n. sp. and Perissocytheridea pirabensis n. sp.; five species in open nomenclature: Perissocytheridea sp. 1, P. sp. 2, P. sp. 3, P. sp. 4, and P. sp. 5 and two species left in "aff." abbreviation: Perissocytheridea aff. Perissocytheridea pumila and Perissocytheridea aff. Perissocytheridea brachyforma subsp. excavata. The distributional pattern of the Perissocytheridea combined with the occurrence of foraminifera Elphidium and Ammonia in the studied sections supports the presence of the brackish water facies to the respective layers. Their quantitative variation through the studied sections indicate more than one phase of salinity reduction (about >5 and genus has a wide paleobiogeographical occurrence and stratigraphic distribution ranging from the Cretaceous to Recent, and already been recorded in the northern of South America, especially in the Neogene of Solimões Basin, but this is the first report of a neotropical genus to the Oligo-Miocene deposits of Pirabas Formation, northern Brazilian Coast, Pará State.

  16. A new species of Halacarsantia Wolff, 1989 (Crustacea, Isopoda, Asellota, Santiidae) from Wistari Reef, southern Great Barrier Reef, Australia

    OpenAIRE

    Michitaka Shimomura; Niel Bruce

    2012-01-01

    Abstract Halacarsantia acuta sp. n. is described from Wistari Reef, Capricorn Group, southern Great Barrier Reef, the first record of the genus from Australia. The new species differs from its congeners in having antenna flagellum composed of 8 articles; epipod apically acute, without setae, broad maxilliped endite and pereopod 1 basis with a short projection. A key to species of the genus is provided.

  17. New records of two species of the coral reef shrimp genus Thor Kingsley, 1878 (Crustacea: Decapoda: Thoridae) from the Ryukyu Islands, Japan.

    Science.gov (United States)

    Komai, Tomoyuki; Okuno, Junji; Minemizu, Ryo

    2015-01-01

    The caridean shrimp genus Thor Kingsley, 1878 (Thoridae) is currently represented by 14 species distributed in shallow tropical to subtropical waters in the Indo-Pacific, East Pacific and West Atlantic oceans. In this study, two species of the genus are reported on the basis of material from Okinawa and Kume islands in the Ryukyu Archipelago, southern Japan. Thor leptochelus (Xu & Li, 2015) n. comb., recently described from Xisha Islands, China and originally assigned to Thinora Bruce, 1997, is transferred to Thor. Relationship of the species to three congeneric species (T. cordelli Wicksten, 1996, T. spinipes Bruce, 1983 and T. spinosus Boone, 1935) is discussed. The second is T. marguitae Bruce, 1973, representing the rediscovery since the original description and new record for Japanese waters. The four specimens of T. leptochelus were all free-living, whereas the single specimen of T. marguitae was found to be associated with a solitary fungiid coral, as previously reported. PMID:26623904

  18. Life history traits in Darwinula stevensoni (Crustacea: Ostracoda from Southern European populations under controlled conditions and their relationship with genetic features

    Directory of Open Access Journals (Sweden)

    Paolo MENOZZI

    2001-02-01

    Full Text Available We describe life history traits of the ostracod Darwinula stevensoni through laboratory experiments. This small (about 0.7 mm, ancient, obligate parthenogenetic species appeared to be particulary difficult to handle as its long life cycle (up to 3-4 years has made lab experiments over several generations very difficult. D. stevensoni is an eurythermal and euryhaline species with low variability in size and shape (both of the carapace and the soft parts. Its genetic variability has also been found to be very low. Survival, clutch size, deposition timing and hatching were evaluated in acclimated and non-acclimated females from seven populations: six from Northern Italy and one from Spain. The samples were collected from three different habitats: four lakes, two streams and one spring. A genetic survey using starch gel electrophoresis had previously revealed that only Glucose phosphate isomerase (Gpi locus was polymorphic. A clone, homozygous at Gpi locus, is the most common in lacustrine and spring habitats in the whole biogeographic range. Surprisingly, two heterozygous clones dominate in Northern Italian lotic environments. Enzymatic activity of heterozygous and homozygous genotypes at Gpi locus was assayed in order to evaluate the relationship between Gpi activity and fitness. Survival and developmental time were not affected by acclimation, while reproductive potential decreased in acclimated females. In females from running waters, reproduction started later and lasted for a shorter time, clutch size was smaller, and hatching percentage lower than females from lakes. These differences are not directly correlated with differences in enzymatic activities at Gpi locus. This does not rule out an overall genetic control of these characteristics since, in a parthenogenetic species, the whole genome is transmitted without recombination. We stress the intriguing case of D. stevensoni in relation to the concept of the "general purpose genotype".

  19. Influence of environmental factors on the response of a natural population of Daphnia magna (Crustacea: Cladocera) to spinosad and Bacillus thuringiensis israelensis in Mediterranean coastal wetlands.

    Science.gov (United States)

    Duchet, C; Caquet, Th; Franquet, E; Lagneau, C; Lagadic, L

    2010-05-01

    The present study was undertaken to assess the impact of a candidate mosquito larvicide, spinosad (8, 17 and 33 microg L(-1)) on a field population of Daphnia magna under natural variations of water temperature and salinity, using Bti (0.16 and 0.50 microL L(-1)) as the reference larvicide. Microcosms (125 L) were placed in a shallow temporary marsh where D. magna was naturally present. The peak of salinity observed during the 21-day observation period may have been partly responsible for the decrease of daphnid population density in all the microcosms. It is also probably responsible for the absence of recovery in the microcosms treated with spinosad which caused a sharp decrease of D. magna abundance within the first two days following treatment whereas Bti had no effect. These results suggest that it may be difficult for a field population of daphnids to cope simultaneously with natural (water salinity and temperature) and anthropogenic (larvicides) stressors. PMID:19939529

  20. Monitoring downstream migrations of Eriocheir sinensis H. Milne Edwards, 1853 (Crustacea: Brachyura: Grapsoidea: Varunidae in the River Thames using capture data from a water abstraction intake

    Directory of Open Access Journals (Sweden)

    David Morritt

    2013-06-01

    Full Text Available The International Union for Conservation of Nature has cited Eriocheir sinensis as one of the world’s worst 100 invasive species. Outsidetheir native range, this alien species has had adverse impacts, both ecologically and economically, on river catchments. Understanding thelife cycle of the Chinese mitten crab, especially details of the migration period, is important for the potential control of this exotic species.The mitten crab has been reported from the River Thames, London, England and in this watershed the population continues to increase innumbers, disperse in a westerly direction and reports of a downstream migration date back to 1996. Recently, regular collections from arubbish screen at a River Thames water abstraction point were used to monitor the migration of adult crabs over three years (2008–2010.Details of size, sex and condition of the crabs were recorded as were data on the abstracted flow. The main migration period runs fromAugust to early November with peak numbers of crabs recorded in September/early October. In all years the sex ratio of captured crabs washeavily skewed towards males, which were significantly larger than females. Furthermore there is some evidence that female crabs movelater in the migration period than males and that peaks in numbers of both male and female crabs are associated with full moon periods; peaknumbers demonstrating significant lunar periodicity. In addition there is a weak association between crab numbers and abstraction flow rate.The key findings are used to recommend the timing of any future control measures that might be designed to reduce the population of thisinvasive species in the River Thames. These recommendations could also be applied to other river catchments where the species isproblematic.