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Protomicrocotylidae
Protomicrocotylidae is a family of monogenean parasites in the order Mazocraeidea. The type-genus of the family is '' Protomicrocotyle''. The genus was created in 1922 by Thomas Harvey Johnston and Oscar Werner Tiegs for a worm previously described under the name ''Acanthodiscus mirabile'' by MacCallum in 1918.MacCallum, G. A. 1918: Notes on the genus ''Telorchis'' and other trematodes. Zoopathologica, 1, 81-97. The worm was parasitic on a crevalle jack of the New York Aquarium. Johnston & Tiegs originally proposed to create the subfamily Protomicrocotylinae, which was later raised to family level. Members of this family are elongate, flat, and long of 1 to several millimetres. The reproductive system includes many testes, located in the anterior region of the body between the ceca, and a single posterior ovary. The male copulatory organ usually has spines. The posterior attachment organ or haptor, which attaches the worm to the host, is asymmetrical and has three pai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Youngiopsis
Protomicrocotylidae is a family of monogenean parasites in the order Mazocraeidea. The type-genus of the family is '' Protomicrocotyle''. The genus was created in 1922 by Thomas Harvey Johnston and Oscar Werner Tiegs for a worm previously described under the name ''Acanthodiscus mirabile'' by MacCallum in 1918.MacCallum, G. A. 1918: Notes on the genus ''Telorchis'' and other trematodes. Zoopathologica, 1, 81-97. The worm was parasitic on a crevalle jack of the New York Aquarium. Johnston & Tiegs originally proposed to create the subfamily Protomicrocotylinae, which was later raised to family level. Members of this family are elongate, flat, and long of 1 to several millimetres. The reproductive system includes many testes, located in the anterior region of the body between the ceca, and a single posterior ovary. The male copulatory organ usually has spines. The posterior attachment organ or haptor, which attaches the worm to the host, is asymmetrical and has three pairs of sm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vallisiopsis
Protomicrocotylidae is a family of monogenean parasites in the order Mazocraeidea. The type-genus of the family is ''Protomicrocotyle''. The genus was created in 1922 by Thomas Harvey Johnston and Oscar Werner Tiegs for a worm previously described under the name ''Acanthodiscus mirabile'' by MacCallum in 1918.MacCallum, G. A. 1918: Notes on the genus ''Telorchis'' and other trematodes. Zoopathologica, 1, 81-97. The worm was parasitic on a crevalle jack of the New York Aquarium. Johnston & Tiegs originally proposed to create the subfamily Protomicrocotylinae, which was later raised to family level. Members of this family are elongate, flat, and long of 1 to several millimetres. The reproductive system includes many testes, located in the anterior region of the body between the ceca, and a single posterior ovary. The male copulatory organ usually has spines. The posterior attachment organ or haptor, which attaches the worm to the host, is asymmetrical and has three pairs of sma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mazocraeidea
Mazocraeidea is an order of flatworms in the subclass Polyopisthocotylea within the class Monogenea. The species of this order have various structures in the clamps of their posterior attachment organ, including additional sclerites in the Gastrocotylidae and related families. However, these additional sclerites, and even the clamps themselves, are lacking in certain members of the family Protomicrocotylidae. Families ;According to PESI: * Anthocotylidae Bychowsky, 1957 * Axinidae Monticelli, 1903 * Chauhaneidae Euzet & Trilles, 1960 * Diclidophoridae Fuhrmann, 1928 * Diplozoidae * Discocotylidae Price, 1936 * Gotocotylidae Yamaguti, 1963 * Heteraxinidae Unnithan, 1957 * Hexostomatidae Price, 1936 * Mazocraeidae Price, 1936 * Microcotylidae Taschenberg, 1879 * Octolabeidae * Plectanocotylidae Monticelli, 1903 * Protomicrocotylidae Johnston & Tiegs, 1922 * Pyragraphoridae Yamaguti, 1963 ;According to the World Register of Marine Species The World Register ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vestigiality
Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homology (biology), homologous features in related species. The emergence of vestigiality occurs by normal evolutionary processes, typically by loss of function of a feature that is no longer subject to Directional selection, positive Evolutionary pressure, selection pressures when it loses its value in a changing environment. The feature may be Negative selection (natural selection), selected against more urgently when its function becomes definitively harmful, but if the lack of the feature provides no advantage, and its presence provides no disadvantage, the feature may not be phased out by natural selection and persist across species. Examples of vestigial structures (also called degenerate, atrophied, or rudimentary orga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clamp (zoology)
Clamps are the main attachment structure of the Polyopisthocotylean monogeneans. Bychowsky, B. E. (1957) Monogenetic Trematodes. Their systematic and phylogeny. Akad. Nauka. USSR. English translation by the American Institute of Biological Science, Washington. 509 pp. These ectoparasitic worms have a variable number of clamps on their haptor (the posterior attachment organ); each clamp is attached to the host fish, generally to its gill. Clamps include sclerotised elements, called the sclerites, and muscles Muscle is a soft tissue, one of the four basic types of animal tissue. There are three types of muscle tissue in vertebrates: skeletal muscle, cardiac muscle, and smooth muscle. Muscle tissue gives skeletal muscles the ability to muscle contra .... The structure of clamps varies according to the groups within the Polyopisthocotylean monogeneans; microcotylids have relatively simple clamps, whereas gastrocotylids have more complex clamps. References {{Reflist Platyhel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lethacotyle
''Lethacotyle'' is a genus of polyopisthocotylean monogeneans, included in the family Protomicrocotylidae. The genus includes only two species: '' Lethacotyle fijiensis'' Manter & Price, 1953 Manter, H. W. & Price, D. F. 1953: Some Monogenetic Trematodes of marine fishes from Fiji. Proceedings of the Helminthological Society of Washington, 20, 105-112. , the type-species of the genus, and '' Lethacotyle vera'' Justine, Rahmouni, Gey, Schoelinck, & Hoberg, 2013 . Both species are parasitic on the gills of jacks in the Pacific Ocean.Ramalingam, K. 1966: A rare record of ''Lethacotyle'' (Monogenea), its post-oncomiracidial larva with observation on distribution. ''Current Science'', 35, 101-10PDFRamalingam, K. 1968: A redescription of ''Lethacotyle'' (Monogenea) and its post-oncomiracidial larva. Journal of the Madras University B, 35-36, 107-114. They are known only from three localities: off Fiji, Andaman Islands, and New Caledonia. The genus ''Lethacotyle'' is special in that i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
