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Ophiura ophiura
''Ophiura ophiura'' or the serpent star is a species of brittle star in the order Ophiurida. It is typically found on coastal seabeds around northwestern Europe.〔
==Description==
''O. ophiura'' has a circular central disc up to 35 mm (1.5 in) wide and five radially arranged, narrow arms each up to long. The general colour is mottled reddish-brown with a paler underside. Both the top and the underside of the disc are covered with calcareous plates. The arms are joined to the top rather than the edge of the disc and further small, articulating plates allow the arms to bend from side to side. There are small spines on the arms which lie flat against the surface. There are four larger plates across the root of each arm with the outer pair having a comb-like edge, with twenty to thirty fine papillae in each.〔(''Ophiura ophiura'' (Linnaeus, 1758) ). ''National Museums of Northern Ireland''. Retrieved August 10, 2011.〕 There are a pair of pores between the underside plates at the root of the arms.〔(A brittlestar - ''Ophiura ophiura'' ). ''Marine Life Information Network''. Retrieved August 10, 2011.〕〔Barrett, J. & C. M. Yonge (1958) Collins Pocket Guide to the Sea Shore. Collins, London〕 There are five large mouth-shield plates on the underside of the disc which surround the central mouth. The teeth are in a vertical row above each of the five jaws and there are about five mouth papillae on each side of the jaw.〔(Macrobenthos of the North Sea - Echinodermata ). ''Marine Species Identification Portal''. Retrieved August 10, 2011.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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