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''Eucidaris'' is a genus of cidaroid sea urchins known as slate pencil urchins. They are characterised by a moderately thick test, a usually monocyclic apical disc, perforate and non-crenulate tubercles and nearly straight ambulacra with horizontal pore pairs. The primary spines are few and widely spaced, stout with blunt flat tips and beaded ornamentation and the secondary spines are short and apressed. They originated in the Miocene and extant members of the genus are found in the tropical Indo-Pacific Ocean, East Pacific, Atlantic Ocean and Caribbean Sea. ==Species== The World Register of Marine Species lists the following species:〔 * ''Eucidaris australiae'' Mortensen, 1950 * ''Eucidaris galapagensis'' Döderlein, 1887 * ''Eucidaris metularia'' (Lamarck, 1816) * ''Eucidaris thouarsii'' (L. Agassiz & Desor, 1846) * ''Eucidaris tribuloides'' (Lamarck, 1816) Eucidaris metularia.jpg|''Eucidaris metularia'' Eucidaris Baltimore Aquarium.jpg|''Eucidaris tribuloides'' Cidaroid urchin in Galapagos.jpg|''Eucidaris galapagensis'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eucidaris」の詳細全文を読む スポンサード リンク
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