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Argulus foliaceus : ウィキペディア英語版
Argulus foliaceus

''Argulus foliaceus'' is a species of crustacean in the family Argulidae, the fish lice. It is sometimes called the common fish louse.〔Soes, D. M., et al. (2010). (The Japanese fish louse ''Argulus japonicus'' new for The Netherlands. ) ''Lauterbornia'' 70, 11–17.〕 It is "the most common and widespread native argulid in the Palaearctic"〔Walker, P. D., et al. (2011). (The off-host survival and viability of a native and non-native fish louse (''Argulus'', Crustacea: Branchiura). ) ''Current Zoology'' 57(6) 828-35.〕 and "one of the most widespread crustacean ectoparasites of freshwater fish in the world", considering its distribution and range of hosts.〔Žiliukienė, V., et al. (2012). (Infestation of ''Argulus foliaceus'' L. on fish fry reared in illuminated cages. ) ''Veterinarija ir Zootechnika'' 57(79), 83–89.〕 It can cause the severe disease state argulosis in a wide variety of fish species. It is responsible for epizootic outbreaks that have led to the collapse of aquaculture operations.〔 Fish lice are not related to lice, which are insects.
==Description==
A typical fish louse of the genus ''Argulus'' is very flat with an oval or rounded carapace, two compound eyes, sucking mouthparts with a piercing stylet, and two suction cups it uses to attach to its host.〔Steckler, N. and R. P. E. Yanong. (''Argulus'' (Fish Louse) Infections in Fish. ) FA184. Florida Cooperative Extension Service. University of Florida IFAS. 2012.〕 These "suctorial organs" are the first of its two pairs of maxillae, modified in shape.〔Alaş, A., et al. (2010). (A study on the morphology of ''Argulus foliaceus'' Lin., 1758 (Crustacea; Branchiura) procured from Çavuşcu Lake (Central Anatolia-Turkey) with scanning electron microscopy. ) ''Turk J Biol'' 34, 147–51.〕 Its paired appendages have hooks and spines,〔 and are used for swimming.〔 ''A. foliaceus'' in particular is up to 7 millimeters long by 5 millimeters wide.〔 The female is larger than the male and has a visible pair of spermathecae on its posterior end, in which the male deposits sperm.〔

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