Sample records for ascaridoidea

  1. Morphological and molecular characterization of Ortleppascaris sinensis sp. nov. (Nematoda: Ascaridoidea) from the Chinese alligator Alligator sinensis. (United States)

    Zhao, J H; Wang, S S; Tu, G J; Zhou, Y K; Wu, X B


    A new nematode species, Ortleppascaris sinensis sp. nov. (Ascaridoidea), is described from specimens found in the stomach and intestine of the Chinese alligator Alligator sinensis Fauvel, 1879 (Crocodilian: Alligatoridae) in the National Nature Reserve of Chinese Alligator (Chinese Crocodile Lake) in Anhui Province, China. This is the first description of O. sinensis sp. nov. in both China and this crocodile host, increasing its distribution in South Asia as well as expanding the number of helminths known to infect this crocodile. The detailed description of O. sinensis sp. nov., based on light and scanning electron microscopic examination, provides new taxonomic data for this species, and we also report sequences of the internal transcribed spacers (ITS), small subunit DNA segments (18S) and the cytochrome oxidase I (COI) gene. PMID:25882968

  2. Ophidascaris wangi sp. n. and O. najae (Gedoelst, 1916) (Ascaridida: Ascaridoidea) from snakes in China. (United States)

    Li, Liang; Guo, Yan-Ning; Li, Jian; Zhang, Lu-Ping


    Ophidascaris wangi sp. n. collected from the king rat snake Elaphe carinata (Günther) (Serpentes: Colubridae) in China is described using both light and scanning electron microscopy. The new species differs from its congeners in the presence of narrow lateral alae originating a short distance posterior to the base of the ventrolateral lips, its relatively long oesophagus (3.57-4.54 mm long, representing 6.6-7.6% of body length), its short spicules (1.89-2.14 mm long, representing 3.9-4.3% of body length), the number and arrangement of caudal papillae (49-57 pairs in total, arranged as follows: 43-51 pairs precloacal, 2 pairs joined paracloacal and 4 pairs postcloacal), the presence of a particular papilliform medioventral, postcloacal ornamentation and the morphology of the eggs and tip of the female tail. In addition, Ophidascaris najae (Gedoelst, 1916), collected from the king cobra Ophiophagus hannah Cantor (Serpentes: Elapidae) in China, is also redescribed. The morphology of the cervical papillae, labial denticles and phasmids of the female is described for the first time.

  3. Duplex quantitative real-time PCR assay for the detection and discrimination of the eggs of Toxocara canis and Toxocara cati (Nematoda, Ascaridoidea in soil and fecal samples

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    Durant Jean-Francois


    Full Text Available Abstract Background Toxocarosis is a zoonotic disease caused by Toxocara canis (T. canis and/or Toxocara cati (T. cati, two worldwide distributed roundworms which are parasites of canids and felids, respectively. Infections of humans occur through ingestion of embryonated eggs of T. canis or T. cati, when playing with soils contaminated with dogs or cats feces. Accordingly, the assessment of potential contamination of these areas with these roundworms eggs is paramount. Methods A duplex quantitative real-time PCR (2qPCR targeting the ribosomal RNA gene internal transcribed spacer (ITS2 has been developed and used for rapid and specific identification of T. canis and T. cati eggs in fecal and soil samples. The assay was set up on DNA samples extracted from 53 adult worms including T. canis, T. cati, T. leonina, Ascaris suum (A. suum and Parascaris equorum (P. equorum. The assay was used to assess the presence of T. cati eggs in several samples, including 12 clean soil samples spiked with eggs of either T. cati or A. suum, 10 actual soil samples randomly collected from playgrounds in Brussels, and fecal samples from cats, dogs, and other animals. 2qPCR results on dogs and cats fecal samples were compared with results from microscopic examination. Results 2qPCR assay allowed specific detection of T. canis and T. cati, whether adult worms, eggs spiked in soil or fecal samples. The 2qPCR limit of detection (LOD in spiked soil samples was 2 eggs per g of soil for a turnaround time of 3 hours. A perfect concordance was observed between 2qPCR assay and microscopic examination on dogs and cats feces. Conclusion The newly developed 2qPCR assay can be useful for high throughput prospective or retrospective detection of T.canis and/or T. cati eggs in fecal samples as well as in soil samples from playgrounds, parks and sandpits.

  4. Helmintos parasitos das espécies Scomberomorus cavalla (Cuvier e Scomberomorus maculatus (Mitchill do litoral cearense: Contracaecum fortalezae sp. n. (Nematoda, Ascaridoidea

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    Vera Lucia M. Klein


    Full Text Available De nematódeos encontrados parasitando estômago, intestinos delgado e grosso de Scomberomorus cavalla (Cuv. e Scomberomorus maculatus (Mitch. o autor propões para o gênero Contracaecum Railliet et Henry, 1912 uma nova espécie, C. fortalezae sp. n., que mais se aproxima de C. clavatum (Rud., 1809 Baylis, 1920 dela se diferenciando por possuir espículos desiguais, um curto ovejetor, útero opistodelfo, ovos menores e por apresentar em todos exemplares estudados ceco intestinal curto e ceco esofagiano longo.In this paper the author proposes a new species of the genus Contracaecum Railliet et Henry, 1912. Of the species under Contracaecum, Contracaecum clavatum (Rudolphi, 1809 Baylis, 1920 is the nearest to Contracaecum fortalezae sp. n. differing from the latter by the following aspects: The males have unequal spicules. The females have a short ovijector and parallel uteri directed backward and the eggs are smaller. In both sexes the intestinal cecum is always short and the ventricular posterior appendix is always long, while Contracaecum clavatum presents these structures in an inverse way, considering the lenght of them. Besides, the thorn-like formations at the posterior end of the body are different.

  5. Um nematodeo parasito do pinguim Spheniscus magellanicus (Forster (Ascaridoidea, Anisakidae A nematode parasite of the penguin Spheniscus magellanicus (Forster (Ascaroidea, Anisakidae

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    Cláudia Portes Santos


    Full Text Available O material estudado foi coletado no "pinguim naufragado", Sphenicus magellanicus (Forster, na baia de Guanabara, Rio de Janeiro e cedido pela bióloga Carla Chediak. Foram examinadas onze fêmeas e três machos, sendo depositados na coleção do Instituto Oswaldo Cruz (IOC sob o numero 31.639. Foi ainda examinado o material pertencente a coleção do IOC, ainda não identificado, tambem coletado do mesmo hospedeiro no Rio de Janeiro, de numeros 20.986 e 30.257.The nematodes were collected from the penguin Spheniscus magellanicus (Forster (Sphenisciformes. A study from the main species of Contracaecum that occur in penguins and piscivorous birds from the south hemisphere is made, more specifically the C. eudyptulae Johnston & Mawson, 1942a, C. eudyptes Johnston & Mawson, 1953, C. heardi Mawson, 1953, C. antarcticum Johnston, 1938, C. prevosli Tchéprakoff, 1966, C. spiculigerum (Rudolphi, 1809, C. osculatum (Rudolphi, 1802, C. scotti (Leiper & Atkinson, 1914 and C. pelagicum Johnston & Mawson, 1942b. C. pelagicum is redescribed and turns to be a new rference for Spheniscus magellanicus (Foster.

  6. Duplex quantitative real-time PCR assay for the detection and discrimination of the eggs of Toxocara canis and Toxocara cati (Nematoda, Ascaridoidea) in soil and fecal samples


    Durant Jean-Francois; Irenge Leonid M; Fogt-Wyrwas Renata; Dumont Catherine; Doucet Jean-Pierre; Mignon Bernard; Losson Bertrand; Gala Jean-Luc


    Abstract Background Toxocarosis is a zoonotic disease caused by Toxocara canis (T. canis) and/or Toxocara cati (T. cati), two worldwide distributed roundworms which are parasites of canids and felids, respectively. Infections of humans occur through ingestion of embryonated eggs of T. canis or T. cati, when playing with soils contaminated with dogs or cats feces. Accordingly, the assessment of potential contamination of these areas with these roundworms eggs is paramount. Methods A duplex qua...

  7. First Report of Lappetascaris lutjani Rasheed, 1965 (Nematoda, Ascaridoidea, Anisakidae Parasitizing Trachipterus arawatae (Pisces, Lampridiformes on the Atlantic Coast of Brazil

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    Vicente Joaquim Júlio


    Full Text Available New host and geographical records are reported for the nematode Lappetascaris lutjani Rasheed, 1965, parasitizing the marine fish Trachipterus arawatae Clark, 1881 in Brazilian waters. Morphometric data and illustrations of the parasites are included.

  8. Pseudoterranova cattani sp. nov. (Ascaridoidea: Anisakidae, a parasite of the South American sea lion Otaria byronia De Blainville from Chile Pseudoterranova cattani sp. nov. (Ascaridoidea: Anisakidae, un parásito del lobo marino común Otaria byronia De Blainville en Chile

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    Full Text Available The parasitic nematode Pseudoterranova cattani sp. nov. is described from the stomach of the South American sea lion Otaria byronia De Blainville, sampled along the coastline off central-south Chile, between 1980 and 1997. The adult and larvae of this species have been previously reported in the Southeastern Pacific Ocean as Phocanema decipiens Myers. Major differences with species from the North Atlantic and Northwest Pacific are based on the body size, number, distance and size of caudal pillaeSe describe al nemátodo parásito Pseudoterranova cattani sp. nov. encontrado en el estómago del lobo marino común Otaria byronia De Blainville, en muestras tomadas entre 1980 y 1997, a lo largo de la costa del centro-sur de Chile. Las larvas y adultos de esta especie han sido registrados en el océano Pacífico sudoriental como Phocanema decipiens Myers. Las principales diferencias con las especies del Atlántico norte y del Pacífico noroccidental se basan en el tamaño corporal y en el número, tamaño, distancia y proporciones de las papilas caudales

  9. First report of parasitism by Ophidascaris robertsi (Nematoda) in a sugar glider (Petaurus breviceps, Marsupialia). (United States)

    Gallego Agúndez, Miguel; Villaluenga Rodríguez, Jose Enrique; Juan-Sallés, Carles; Spratt, David M


    Third-stage larvae of Ophidascarsis robertsi (Nematoda: Ascaridoidea) were found on necropsy in a female sugar glider, Petaurus breviceps (Marsupialia: Petauridae), two in heart chambers and one free in the peritoneal cavity. The animal was bred in captivity and had previous contact with Australian pythons captured in nature, which could be the source of the infection. The histopathologic diagnosis was intraluminal and perivascular pulmonary hemorrhage possibly due to the parasitosis. It is the first report of parasitism by O. robertsi in a sugar glider.

  10. Lutz's spontaneous sedimentation technique and the paleoparasitological analysis of sambaqui (shell mound sediments

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    Morgana Camacho


    Full Text Available Parasite findings in sambaquis (shell mounds are scarce. Although the 121 shell mound samples were previously analysed in our laboratory, we only recently obtained the first positive results. In the sambaqui of Guapi, Rio de Janeiro, Brazil, paleoparasitological analysis was performed on sediment samples collected from various archaeological layers, including the superficial layer as a control. Eggs of Acanthocephala, Ascaridoidea and Heterakoidea were found in the archaeological layers. We applied various techniques and concluded that Lutz's spontaneous sedimentation technique is effective for concentrating parasite eggs in sambaqui soil for microscopic analysis.

  11. Baylisascariosis--infections of animals and humans with 'unusual' roundworms. (United States)

    Bauer, Christian


    The nematode genus Baylisascaris (order Ascaridida, superfamily Ascaridoidea) contains nine relatively host-specific, parasite species of carnivores, omnivores, herbivores, carnivorous marsupials or rodents. They have a facultative heteroxenous life cycle, at least under experimental conditions. Eggs passed in faeces embryonate in the environment and the second-stage larva infective for both definitive and intermediate hosts develops. In intermediate hosts larvae migrate extensively through tissues, where they grow and moult to the third-stage, causing extensive damage. All Baylisascaris spp. are considered a potential cause of visceral, ocular and/or neural larval migrans in mammals including humans and in birds. This paper summarises our current knowledge on the prevalence, biology, pathogenicity and zoonotic significance of three Baylisascaris species: B. transfuga, B. schroederi and B. procyonis which have as definitive hosts bears, giant pandas and raccoons (occasionally dogs), respectively. PMID:23339846

  12. Helminths of the Florida manatee, Trichechus manatus latirostris, with a discussion and summary of the parasites of sirenians. (United States)

    Beck, C A; Forrester, D J; Beck, C


    We examined 215 Florida manatees (Trichechus manatus latirostris) at necropsy to determine the helminth fauna. Six species were identified: Heterocheilus tunicatus (Nematoda: Ascaridoidea); Anoplocephala sp. (Cestoda: Cyclophyllidea); and 4 species of trematodes, Cochleotrema cochleotrema (Digenea: Opisthotrematidae), Chiorchis fabaceus (Digenea: Paramphistomatidae), Nudacotyle undicola (Digenea: Nudacotylidae), and Moniligerum blairi (Digenea: Opisthotrematidae). Seventy-three percent of the manatees examined were infected with at least 1 species of helminth. The mean number of species of helminths per infected manatee was 1.9 with a range of 1-4. Fifty-nine manatees were helminth-free; 30 of these were calves. No associations were found between the intensity of helminth infections and host sex, age class, season, and geographic location of recovery, or cause of death. Differences in parasite prevalence between age classes were highly significant for Chiorchis, Cochleotrema, and Heterocheilus, due to a low number of infected calves. A higher prevalence of Cochleotrema was found in manatees recovered from eastern Florida, and Heterocheilus was evident in significantly more manatees from western and souther Florida. Comparisons in the parasite fauna are made among Florida manatees and other sirenian populations, and a brief review of sirenian parasites is included. PMID:3397825

  13. Endoparasitic helminths of the harbour seal, Phoca vitulina, in the Netherlands (United States)

    Borgsteede, F. H. M.; Bus, H. G. J.; Verplanke, J. A. W.; van Burg, W. P. J.

    The endoparasitic helminth fauna of harbour seals which had died during the epidemic of the phocine distemper virus in 1988 was studied. Lungs, heart and gastrointestinal tracts of 94 animals collected along the Dutch coast were available for investigation. The following parasites and infection percentages were found: Nematoda: Dipetalonema spirocauda (24.5%), Otostrongylus circumlitus (6.4%), Parafilaroides gymnurus (24.5%), Ascaridoidea spec. (58.5%); Trematoda: Phagicola septentrionalis (66.0%), Cryptocotyle lingua (74.5%); Cestoda: Diphyllobothrium spec. (8.5%); Acanthocephala: Corynosoma strumosum (70.2%). The presence of worm species was not evenly distributed over the age classes. Seals younger than one year harboured fewer parasites. The highest percentages were found in 1 to 2 year old seals. The number of worms per seal varied greatly. The highest burden for ascarids was 253, for P. septentrionalis 123 000, for C. lingua 112 000 and for C. strumosum 251. A comparison of the present results with those described in the literature shows that in Dutch seals the same species were present and that numbers of worms were not higher than before the 1988 mass mortality. It is therefore concluded that helminth parasites did not cause the mass mortality.

  14. The complete mitochondrial genome of Toxascaris leonina: Comparison with other closely related species and phylogenetic implications. (United States)

    Liu, Guo-Hua; Zhou, Dong-Hui; Zhao, Lei; Xiong, Rong-Chuan; Liang, Jian-Ying; Zhu, Xing-Quan


    Adults of Toxascaris leonina (Nematoda: Ascarididae) live in the gastrointestinal tract of both dogs and cats, and cause significant economic losses and potential public health problem worldwide. Although many studies have given insights into this significant pathogen, to date, the complete mitochondrial (mt) genome sequence is still not available for T. leonina. Here, we sequenced the complete mt genome of T. leonina. This AT-rich (71.53%) mt genome (14,310bp) is circular and consists of 36 genes, including 12 genes for proteins, 2 genes for rRNA and 22 genes for tRNA. All mt genes of T. leonina are transcribed in the same direction. The gene order is the same as those of Ascaris spp. (Ascarididae), Toxocara spp. (Toxocaridae), Anisakis simplex and Contracaecum rudolphii B (Anisakidae), but distinct from that of Ascaridia spp. (Ascaridiidae). Phylogenetic analyses using concatenated amino acid sequences of 12 protein-coding genes by Bayesian inference (BI) showed distinct groups with high statistical support, and our data confirm that T. leonina is a member of the Ascarididae, and that this family is more closely related to the Toxocaridae rather than the Anisakidae within the Ascaridoidea. The determination of mt genome sequences of T. leonina provides novel genetic markers for studies into the systematics, population genetics and epidemiology of this parasite. PMID:24316156

  15. Studies on ascaridid, oxyurid and enoplid nematodes (Nematoda) from fishes of the Okavango River, Botswana. (United States)

    Moravec, Frantisek; Van As, Liesl L


    Based on light and scanning electron microscopical studies, eight species (five adult and three larval) of nematodes belonging to the Ascaridida, Oxyurida and Enoplida were collected from fishes of the Okavango River, Botswana, namely Falcaustra similis Moravec et Van As, 2004, Atractidae gen. sp. (only female) (both Cosmocercoidea), Cucullanus sp. (only female) (Seuratoidea), Cithariniella longicaudata sp. n., Synodontisia annulata sp. n. (both Oxyuroidea), Contracaecum sp. third-stage larvae, third-stage larvae of Galeiceps sp. (both Ascaridoidea) and Eustrongylides sp. fourth-stage larvae (Dioctophymatoidea). The new species Citharinella longicaudata (type host Schilbe intermedius Rüppel) is mainly characterised by the shape and size of cephalic papillae and the spicule 108 µm long, and Synodontisia annulata (type host S. intermedius) by the shape of cephalic papillae, body length of gravid females (4.88-5.33 mm) and a short spicule (66 µm long). The female specimen of Cucullanus sp. from Tilapia sparmanni Smith markedly differs from congeners parasitising inland fishes in Africa by the elongate pseudobuccal capsule and by the excretory pore far posterior to the oesophago-intestinal junction; apparently, it belongs to an undescribed species. Galeiceps larvae parasitising fishes are described for the first time. Cithariniella gonzalezi Van Waerebeke, Chabaud, Bain et Georges, 1988 is considered a junior synonym of C. khalili Petter, Vassiliadès et Troncy, 1972, and the previous records of Cithariniella citharini Khalil, 1964 from Synodontis spp. in Egypt concern, in fact, Cithariniella khalili Petter, Vassiliadès et Troncy, 1972. The specimens of Cithariniella reported by Koubková et al. (2010) from Paradistichodus dimidiatus (Pellegrin) in Senegal and misidentified as C. gonzalesi Van Waerebeke, Chabaud, Bain et Georges, 1988 are considered to represent a new species, C. koubkovae sp. n.; this is established by reference to the description and drawings

  16. Dípteros muscóides como vetores mecânicos de ovos de helmintos em jardim zoológico, Brasil Muscoid dipterans as helminth eggs mechanical vectors at the zoological garden, Brazil

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    Vanderleia Cristina de Oliveira


    Full Text Available OBJETIVO: Verificar as espécies de dípteros muscóides capazes de veicular ovos e larvas de helmintos e avaliar o potencial de contaminação dos dípteros capturados. MÉTODOS: A pesquisa foi realizada em dois pontos distintos do Jardim Zoológico da cidade do Rio de Janeiro, RJ, no período de maio de 1996 a abril de 1998. As capturas dos dípteros foram realizadas semanalmente com armadilhas contendo peixe em putrefação, que permaneceram expostas durante uma hora nos dois pontos: local 1- próximo à lixeira do zoológico e o local 2- perto do recinto do hipopótamo e das aves de rapina. Foram capturadas 41.080 moscas, sendo a espécie Chrysomya megacephala mais representativa com 69,34%, seguida de Chrysomya albiceps 11,22%, Musca domestica 7,15%, Chrysomya putoria 4,52%, Fannia sp. 3,12%, Ophyra sp. 2,53% e Atherigona orientalis 2,08%. As moscas capturadas tiveram a superfície dos corpos lavadas com água destilada e os tubos digestivos dissecados. RESULTADOS: Das espécies estudadas, C. megacephala e M. domestica apresentaram maior quantidade de ovos de helmintos na superfície do corpo e no conteúdo intestinal. Ovos de Ascaridoidea e Trichinelloidea prevaleceram no conteúdo intestinal de C. megacephala. Dos ovos de helmintos encontrados na superfície do corpo e no conteúdo intestinal foram identificados: Ascaris sp., Toxascaris sp., Toxocara sp., Trichuris sp., Capillaria sp., Oxiurídeos, Triconstrogilídeos e Acantocephala. Também foram encontradas larvas de helmintos na superfície do corpo dos dípteros. Houve diferenças significativas (nível de 5%, pelo teste F entre os diferentes pontos de capturas em relação ao número de ovos de helmintos encontrados nos dípteros. CONCLUSÕES: As fezes dos animais do jardim zoológico, encontradas freqüentemente nos abrigos e lixeiras, contribuíram para a proliferação dos dípteros muscóides, que assumem importante papel na veiculação de ovos de helmintos, principalmente pelo