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Ophelina acuminata : ウィキペディア英語版 | Ophelina acuminata
''Ophelina acuminata'' is a species of marine annelids, found in the sublittoral mud and sand bottom. ==Morphology==
Body slender and 25–60 mm long, with 50 chaetae bearing segments. Colour yellowish or pearly grey with bright red gills, and all segments finely multi-annulated. The prostomium is conical, ending in a median progress with a slightly swollen tip and two big dorsolateral nuchal-crevasses. Except first, and two to three last segments, all chaetigers has long cirriform gills, and ventral cirri. Anus surmounded by a spoon shaped hood with a ventral opening, 20 fine annular rings and 14-20 long papillae along edge. On the ventral side of basis, two long cirrus, behind one unpaired longer cirri. .〔Kirkegaard, J. B. Danmarks Fauna 86, Havbørsteorme II. Copenhagen. Danmarks Naturhistoriske Forening, 1996.〕〔Hayward, P. J. & Ryland, J. S. Handbook of the Marine Fauna of North- West Europe. Oxford. Oxford University Press, 2010.〕
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