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Ophiactis savignyi
''Ophiactis savignyi'' is a species of brittle star in the family Ophiactidae, commonly known as Savigny's brittle star or the little brittle star. It occurs in the tropical and subtropical parts of all the world's oceans and is thought to be the brittle star with the most widespread distribution.〔(【引用サイトリンク】title= ''Ophiactis savignyi'': Savigny's Brittle Star )〕 It was first described by the German zoologists Johannes Peter Müller and Franz Hermann Troschel in 1842. The specific name honours the French zoologist Marie Jules César Savigny.
==Description==
The disc of ''O. savignyi'' is up to in diameter. The aboral (upper) surface is covered by large overlapping scales and bears a scattering of spines, especially round the edges of the disc. The (usually) six arms are long, slender and tapering, and are composed of many segments with joints between them. Each segment bears five or six thorny spines. The aboral surface of the disc is a pale greenish-brown colour and the large, triangular radial shields, close to the origins of the arms, are contrastingly darker. The oral (under) surface is cream-coloured.〔
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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