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Ergasilidae
Ergasilidae is a widespread family of copepods and comprises many species. The type genus is ''Ergasilus''. With a few doubtful exceptions all ergasilids are parasitic on fishes. Biology Various species of Ergasilidae parasitise hosts in various habitats, mostly freshwater, but some attack marine species, especially euryhaline fishes such as mullet. Because the best-known species are adapted to attack the gill filaments of the fishes, Ergasilidae are known by common names such as ''gill lice''. However, some species have been found infesting, and presumably causing, external skin lesions of fish. Immature instars and mature males of Ergasilidae are fairly typical free-living planktonic copepods. The mature females also can swim competently and at least one species, ''Ergasilus chautauquaensis'', is not known to be parasitic at all. However, that is exceptional; most adult females are parasitic and have morphological adaptations for attacking the gills of host species of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abergasilus
''Abergasilus amplexus'' is a species of parasitic copepod endemic to euryhaline habitats in New Zealand. It is the only known species in the genus ''Abergasilus''. Description This species is unique among ergasilids in that it only has three pairs of legs: the fourth and fifth pairs are reduced to single spines or are completely absent. The second antenna is very distinctive, hooks on the last and penultimate segments creating an obviously claw-like structure, more obvious in the female. The male is free-living, forming part of the plankton. Both sexes have an average length of 0.5 mm. Hosts The main host appears to be '' Anguilla australis'': in Lake Ellesmere, infestation rates on this eel approach 100%, sometimes with over 100 parasites on the gills of a single fish. Other recorded host species include ''Anguilla dieffenbachii'', ''Arripis trutta'', '' Carassius auratus'', '' Galaxias maculatus'', ''Perca fluviatilis'', ''Pseudophycis bachus'', ''Retropinna retropinn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ergasilus
''Ergasilus'' is a genus of copepod crustaceans occurring in both the ocean and fresh water, often called gill lice. The females are parasitic upon the gills of fishes. Being copepods, gill lice have a single median eye on their head. The second antennae are modified into prehensile pincers. Male gill lice are free-living. Species include: *''Ergasilus anchoratus'' Markevich, 1946 *''Ergasilus arthrosis'' L. S. Roberts, 1969 *''Ergasilus auritus'' Markevich, 1940 *''Ergasilus briani'' Markevich, 1932 *''Ergasilus caeruleus'' C. B. Wilson, 1911 *''Ergasilus celestis'' J. F. Müller, 1937 *''Ergasilus centrarchidarum'' Wright, 1882 *''Ergasilus cerastes'' L. S. Roberts, 1969 *''Ergasilus chautauquaensis'' Fellows, 1887 *''Ergasilus clupeidarum'' S. K. Johnson & W. A. Rogers, 1972 *''Ergasilus cotti'' Kellicott, 1892 *''Ergasilus cyanopictus'' *''Ergasilus cyprinaceus'' W. A. Rogers, 1969 *''Ergasilus elongatus'' C. B. Wilson, 1916 *''Ergasilus felichthys'' (Pearse, 1947) *''Ergas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ergasilus
''Ergasilus'' is a genus of copepod crustaceans occurring in both the ocean and fresh water, often called gill lice. The females are parasitic upon the gills of fishes. Being copepods, gill lice have a single median eye on their head. The second antenna Antenna ( antennas or antennae) may refer to: Science and engineering * Antenna (radio), also known as an aerial, a transducer designed to transmit or receive electromagnetic (e.g., TV or radio) waves * Antennae Galaxies, the name of two collid ...e are modified into prehensile pincers. Male gill lice are free-living. Species include: *'' Ergasilus anchoratus'' Markevich, 1946 *'' Ergasilus arthrosis'' L. S. Roberts, 1969 *'' Ergasilus auritus'' Markevich, 1940 *'' Ergasilus briani'' Markevich, 1932 *'' Ergasilus caeruleus'' C. B. Wilson, 1911 *'' Ergasilus celestis'' J. F. Müller, 1937 *'' Ergasilus centrarchidarum'' Wright, 1882 *'' Ergasilus cerastes'' L. S. Roberts, 1969 *'' Ergasilus chautauquaensis'' Fellows, 1887 *' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tissue (biology)
In biology, tissue is a biological organizational level between cells and a complete organ. A tissue is an ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues. The English word "tissue" derives from the French word "tissu", the past participle of the verb tisser, "to weave". The study of tissues is known as histology or, in connection with disease, as histopathology. Xavier Bichat is considered as the "Father of Histology". Plant histology is studied in both plant anatomy and physiology. The classical tools for studying tissues are the paraffin block in which tissue is embedded and then sectioned, the histological stain, and the optical microscope. Developments in electron microscopy, immunofluorescence, and the use of frozen tissue-sections have enhanced the detail that can be observed in tissues. With these tools, the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
