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The Arbacioida are an order of sea urchins, consisting of a single family, the Arbaciidae. They are distinguished from other sea urchins by the presence of five separate plates around the anus. Unlike their close relatives, the Salenioida, all of the tubercles on their tests are of similar size. It contains these genera: * ''Arbacia'' Gray, 1835 * ''Arbaciella'' Mortensen, 1910a * ''Arbia'' Cooke, 1948† * ''Baueria'' Noetling, 1885† * ''Codiopsis'' L. Agassiz, in Agassiz & Desor, 1846† * ''Coelopleurus'' L. Agassiz, 1840a * ''Cottaldia'' Desor, 1856 † * ''Dialithocidaris'' A. Agassiz, 1898 * ''Habrocidaris'' A. Agassiz & Clark, 1907b * ''Podocidaris'' A. Agassiz, 1869 * ''Pygmaeocidaris'' Döderlein, 1905 * ''Sexpyga'' Shigei, 1975 * ''Tetrapygus'' L. Agassiz, 1841b ==References== * * 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「Arbacioida」の詳細全文を読む スポンサード リンク
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