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Squamodisc
Squamodiscs are epidermal structures, which are typical of and found only in certain monogeneans of the family Diplectanidae. There are, typically, two squamodiscs, one ventral and one dorsal, located on the haptor of the monogenean. Squamodiscs are usually made up of scales embedded in the epidermis, which appear from the outside as rodlets arranged in rows. According to the classical book of Bychowsky (1967), 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. “the Diplectanidae] have special paired attaching formations lying above the disc and also partially on it, on the dorsal and ventral sides in the shape of small rounded convexities equipped with numerous ..thorn-shaped little hooks or thin thread-like plates located more or less in concentric rows ("squamodisc")". Ultrastructural studies of squamodiscs have shown that they include ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calydiscoides
''Calydiscoides'' is a genus of monopisthocotylean monogeneans, included in the family Diplectanidae. The genus currently includes 16 species, which are all parasitic on the gills of marine fish of the family Lethrinidae and Nemipteridae. All species are from the Indo-Pacific Ocean. The type-species of the genus is '' Calydiscoides australis'' Young, 1969. Morphology All species of ''Calydiscoides'' are small animals, ranging 0.5–1 mm in length. As with most monogeneans, they are flat, with an anterior head bearing four oculi and head glands, a main elongate body and a posterior haptor. The digestive system includes an anterior muscular pharynx, and two lateral intestinal branches (or caeca); as in all Platyhelminthes, there is no anus. The haptor, in the posterior part of the body, is a specialized organ used to attach to the host. The haptor includes sclerotized elements, namely a ventral bar, two lateral (dorsal) bars, two ventral hooks, and two dorsal hooks, and fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lamellodiscus
''Lamellodiscus'' is a genus of monopisthocotylean monogeneans in the family Diplectanidae; all species of ''Lamellodiscus'' are small worms, Fish diseases and parasites, parasitic on the gills of teleost fish. The type-species of the genus is ''Lamellodiscus typicus'' Johnston & Oscar Werner Tiegs, Tiegs, 1922, a parasite of a Sparidae, sparid fish caught in Moreton Bay, Queensland, Australia. Johnston, T.H. & Oscar Werner Tiegs, Tiegs, O.W. (1922) New Gyrodactyloid Trematodes from Australian fishes together with a reclassification of the Super-Family Gyrodactyloidea. Proceedings of the Linnean Society of New South Wales, 47, 83–131PDF on BHL Etymology T. Harvey Johnston & Oscar Werner Tiegs, who created the genus in 1922, did not formally explain the etymology of the new name. However, their definition of the new genus "disc well developed, with the accessory locomotory disc (squamodisc) peculiarly modified in such a way as to present numerous concentric rows consisting each ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diplectanidae
The Diplectanidae are a family of monopisthocotylean monogeneans. They are all parasitic on the gills of fish (marine or freshwater). Diplectanids are small animals, generally around 1 mm in length. As parasites, they can be extremely numerous, up to several thousand on an individual fish. History The family Diplectanidae was proposed by the Italian parasitologist Francesco Saverio Monticelli, Monticelli in 1903 (as subfamily Diplectaninae). The status of the family and its components was later examined by various authors, including Johnston & Oscar Werner Tiegs, Tiegs (1922), Price (1937),Price, E. W. 1937: North American Monogenetic Trematodes. I. The superfamily Gyrodactyloidea ''Journal of the Washington Academy of Sciences'' 27, 146-164PDF Boris Evseevitch Bychowsky, Bychowsky (1957), Satyu Yamaguti, Yamaguti (1963), and Oliver (1987). Morphology Diplectanids are diagnosed by the combination of these three characters: * Presence of accessory adhesive organs on dorsal a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudorhabdosynochus Epinepheli (Monogenea, Diplectanidae) - Squamodiscs
''Pseudorhabdosynochus epinepheli'' is a Diplectanidae, diplectanid monogenean parasitic on the gills of species of groupers. It is the type species of the genus ''Pseudorhabdosynochus'' Satyu Yamaguti, Yamaguti, 1958. Description ''Pseudorhabdosynochus epinepheli'' is a small monogenean, about half a millimetre in length. Adults are hermaphrodite, hermaphroditic. The species has the general characteristics of other Diplectanidae, diplectanids, with a flat body and a posterior haptor, which is the organ by which the monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal, which are made up of numerous rows of rodlets. The reproductive organ include a single ovary and a single testis. The sclerotized male copulatory organ, or "quadriloculate organ", has the shape of a bean with four internal chambers, as in other species of ''Pseudorhabdosynochus''. The vagina also includes a sclerotized part, which is a complex structure. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
