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Ophryotrocha eutrophila : ウィキペディア英語版 | Ophryotrocha eutrophila
Ophryotrocha eutrophila, is a species of polychaete worm.〔Wiklund, Helena, Adrian G. Glover, and Thomas G. Dahlgren. "Three new species of Ophryotrocha (Annelida: Dorvilleidae) from a whale-fall in the North-East Atlantic." Zootaxa 2228 (2009): 43-56.〕 ''Ophryotrocha eutrophila'' is named after its habitat, liking organically enriched environments (''eutrophic'' = “organically”; ''philus'' = “like”). This species resembles ''O. puerilis'' in jaw morphology. ''O. eutrophila'' is dimorphic, with males being than females, while possessing K-type maxillae. ''Ophryotrocha eutrophila'', however, differs from ''O. puerilis'' in the absence of eyes and the presence of a developed median pygidial stylus. ''O. eutrophila'' is also similar to ''O. Fabriae'', differing from the latter from its mandibles morphology.〔 ==Description==
It is a transparent colour, females possessing eggs larger than the males. Its body is elongated, tapering slightly at the end. Its prostomium counts with digitiform paired antennae inserted dorsally. Its palps are papilliform, inserted laterally on the prostomium. It lacks eyes. Its mandibles are rod-like, with anterior dentition. Its maxillae has 7 pairs of free denticles. It also counts with two peristomial segments without setae, its parapodia being uniramous and showing short dorsal and ventral cirri. Its supraacicular simple chaetae shows distal serration, while subacicular chaetae are compound, its blades showing serration. Its pygidium has a terminal anus, with two pygidial cirri being laterally inserted, as well as an unpaired appendage that is placed ventrally.〔
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