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Anisakidae
The Anisakidae are a family of intestinal nematodes (roundworms). The larvae of these worms can cause anisakiasis when ingested by humans, in raw or insufficiently cooked fish. Anisakidae worms can infect many species of fish, birds, mammals and even reptiles. They have some traits that are common with other parasites. These include: spicules, tail shapes and caudal papillae. This family of parasites have a complex life cycle, meaning that they come in contact with more than one host throughout the duration of their life. Adult Anisakidae worms lay eggs in the gut of many species of marine mammals, and then these eggs are excreted from the host via fecal matter. Once these hatched larvae are in open water, they can be ingested by krill or other crustaceans. At this stage, the prevalence, or proportion of infected hosts, is rather low. The infected crustaceans can then be eaten by fish and cephalopods, where the parasite then furthers its development. Once the fish obtains the pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anisakis
''Anisakis'' (a·nuh·saa·keez) is a genus of parasitic nematodes that have life cycles involving fish and marine mammals. They are infective to humans and cause anisakiasis. People who produce immunoglobulin E in response to this parasite may subsequently have an allergic reaction, including anaphylaxis, after eating fish infected with ''Anisakis'' species. Etymology The genus ''Anisakis'' was defined in 1845 by Félix Dujardin as a subgenus of the genus ''Ascaris'' Linnaeus, 1758. Dujardin did not make explicit the etymology, but stated that the subgenus included the species in which the males have unequal spicules ("''mâles ayant des spicules inégaux''"); thus, the name ''Anisakis'' is based on ''anis-'' (Greek prefix for different) and ''akis'' (Greek for spine or spicule). Two species were included in the new subgenus, ''Ascaris'' (''Anisakis'') ''distans'' Rudolphi, 1809 and ''Ascaris'' (''Anisakis'') simplex Rudolphi, 1809. Life cycle ''Anisakis'' species have c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anisakiasis
''Anisakis'' (a·nuh·saa·keez) is a genus of parasitic nematodes that have life cycles involving fish and marine mammals. They are infective to humans and cause anisakiasis. People who produce immunoglobulin E in response to this parasite may subsequently have an allergic reaction, including anaphylaxis, after eating fish infected with ''Anisakis'' species. Etymology The genus ''Anisakis'' was defined in 1845 by Félix Dujardin as a subgenus of the genus ''Ascaris'' Linnaeus, 1758. Dujardin did not make explicit the etymology, but stated that the subgenus included the species in which the males have unequal spicules ("''mâles ayant des spicules inégaux''"); thus, the name ''Anisakis'' is based on ''anis-'' (Greek prefix for different) and ''akis'' (Greek for spine or spicule). Two species were included in the new subgenus, ''Ascaris'' (''Anisakis'') ''distans'' Rudolphi, 1809 and ''Ascaris'' (''Anisakis'') simplex Rudolphi, 1809. Life cycle ''Anisakis'' species have compl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Contracaecum
''Contracaecum'' is genus of parasitic nematodes from the family Anisakidae. These nematodes are parasites of warm-blooded, fish eating animals, i.e. mammals and birds, as sexually mature adults. The eggs and the successive stages of their larvae use invertebrates and increasing size classes of fishes as intermediate hosts. It is the only genus in the family Anisakidae which can infect terrestrial, marine and freshwater animals. Life cycle The adults live as parasites in the stomachs of piscivorous birds and mammals. As third stage larvae they attach to the stomach of the species of fish which are preyed on by their definitive host. When the intermediate host fish is eaten and reached the warm stomach of its predator the larvae of ''Contracaecum'' moult twice into adult males and females, producing eggs which are expelled into water in the faeces of the host. Where the water is shallow the eggs or larvae descend to the sea bed. Here they may be consumed by invertebrates while thos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anisakis Simplex
''Anisakis simplex'', known as the herring worm, is a species of nematode in the genus ''Anisakis''. Like other nematodes, it infects and settles in the organs of marine animals, such as salmon, Mackerel, mackerels and Squid, squids. It is commonly found in cold marine waters, such as the Pacific Ocean and Atlantic Ocean. This species begins as an egg found in the Feces, faeces of its host, and hatches as a second-stage larva in the ocean, where it survives for several days. This larva is then consumed by an intermediate Host (biology), host, usually a krill, and it develops into a third stage larva within the body of this intermediate host. The krill is then ingested by a Predation, predator, such as squid or fish, which act as the paratenic host for ''A. simplex''. The worm reaches the end of its life cycle when the paratenic host is ingested by a whale or another marine mammal. In the abdominal cavity of this final host, ''A. simplex'' develops into a fully mature worm and rep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terranova (roundworm)
''Terranova'' is a genus of parasitic nematodes. Species from this genus are known to parasitise sharks, rays, sawfishes, teleosts and crocodilians.Sprent, J.F.A. (1992"Parasites lost?"''International Journal for Parasitology'' 22(2): 139-151. doi: 10.1016/0020-7519(92)90095-3 However, in 2020, František Moravec and Jean-Lou Justine considered this taxon to be invalid on the ground that "its type species . e., ''T. antarctica''has been designated a ''species inquirenda''", and split many of its species into two new-described genera, ''Euterranova'' and ''Neoterranova ''Neoterranova'' is a genus of parasitic nematodes that have life cycles involving sharks and reptiles. The genus was created in 2020 to accommodate species which were previously included in'' Terranova'' Leiper & Atkinson, 1914 Leiper RT, Atkin ...''. The type specimen and so far only found adult individual available for feature classification of ''T. antarctica'' is a female, and many features for such pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudoterranova
''Pseudoterranova'' is a genus within the family Anisakidae of parasitic nematodes with an aquatic life cycle. The lifecycle of ''Pseudoterranova'' spp. involves marine mammals, pinnipeds (sea lions, seals and walruses) as definitive hosts, planktonic or benthic crustaceans as intermediate hosts and fish which act as second intermediate or paratenic hosts In biology and medicine, a host is a larger organism that harbours a smaller organism; whether a parasitic, a mutualistic, or a commensalist ''guest'' (symbiont). The guest is typically provided with nourishment and shelter. Examples include a .... In some regions, the rise in seal numbers has prefaced a significant increase in fish infected with ''P. decipiens'' which is of concern for fish health. Infection with ''Pseudoterranova'' may affect the health and swimming ability of the fish host and is therefore of concern for the survival of wild caught and farmed species. Species belonging to this genus have been demonstrated ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neoterranova
''Neoterranova'' is a genus of parasitic nematodes that have life cycles involving sharks and reptiles. The genus was created in 2020 to accommodate species which were previously included in'' Terranova'' Leiper & Atkinson, 1914 Leiper RT, Atkinson EL. 1914. Helminths of the British Antarctic Expedition, 1910–1913. Proceedings of the Zoological Society of London, pp. 222–226 a taxon considered to be invalid. Etymology The name ''Neoterranova'' is composed of ''Terranova'' (the name of a nematode genus) and the prefix ''Neo-'' (= new). The gender is feminine. Species The type-species is ''N. scoliodontis'' (Baylis, 1931) Moravec & Justine, 2020. It is a parasite of the stomach and intestine of the Tiger shark ''Galeocerdo cuvier'', first described in 1931.Baylis HA. 1931. Some Ascaridae from Queensland. Annals and Magazine of Natural History, Series, 10(8), 95–102. Other species are listed in the taxobox. See also ''Euterranova ''Euterranova'' is a genus of parasi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
František Moravec (parasitologist)
František Moravec (born 1 January 1939) is a Czech parasitologist who specialises on the Nematodes, especially the nematodes parasites of fishes. His research is mainly in the field of taxonomy of the Nematoda. Education and career Moravec was born on 1 January 1939 in Velká Bystřice. He was in high school in Olomouc then was a student in the Masaryk University in Brno, Czech Republic (at that time Czechoslovakia). For his Masters in 1962, he studied the parasitic worms of reptiles of Czechoslovakia. After graduation, he worked at the Institute of Parasitology of the Czech Academy of Sciences in České Budějovice, and in 1970 completed his thesis on nematodes parasites in fish. He is a world authority on Nematodes, especially their systematics and biology. Research Among the most important works by Moravec, Tomáš Scholz mentions his revision of the genera '' Rhabdochona'' and '' Anguillicola'', and also his clarification of the family Capillariidae, for which he propose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euterranova
''Euterranova'' is a genus of parasitic nematodes that have life cycles involving elasmobranchs. The genus was created in 2020 to accommodate species which were previously included in'' Terranova'' Leiper & Atkinson, 1914 Leiper RT, Atkinson EL. 1914. Helminths of the British Antarctic Expedition, 1910–1913. Proceedings of the Zoological Society of London, pp. 222–226 a taxon considered to be invalid. Etymology The name ''Euterranova'' is composed of ''Terranova'' (the name of a nematode genus) and the prefix ''Eu-'' (= proper, true). The gender is feminine. Species The type-species is ''E. dentiduplicata'' Moravec & Justine, 2020. It was described in 2020 from specimens from the stomach of the Zebra shark ''Stegostoma fasciatum'', collected from off New Caledonia. Other species are listed in the taxobox. All are parasites of elasmobranchs. An undescribed species (''Euterranova'' sp.) was also recorded from the shark ''Triaenodon obesus'' off New Caledonia. See also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematode
The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-Parasitism, parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments. Less formally, they are categorized as Helminths, but are taxonomically classified along with Arthropod, arthropods, Tardigrade, tardigrades and other moulting animalia, animals in the clade Ecdysozoa, and unlike platyhelminthe, flatworms, have tubular digestion, digestive systems with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species described to date vary by author and may change rapidly over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematode Families
The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments. Less formally, they are categorized as Helminths, but are taxonomically classified along with arthropods, tardigrades and other moulting animals in the clade Ecdysozoa, and unlike flatworms, have tubular digestive systems with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species described to date vary by author and may change rapidly over time. A 2013 survey of animal biodiversity published in the mega ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
