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''Crepidula onyx'', the onyx slippersnail or onyx slipper snail, is a species of sea snail with gills, a marine gastropod mollusc in the family Calyptraeidae, the slipper snails and cup-and-saucer snails. ==Shell description== The shell of ''Crepidula onyx'' is up to 70 mm in length. The interior of the shell is glossy and is a strong tan to dark brown color, similar to the common colors of the mineral onyx. The "shelf" or "deck" is white. The shell of this species can be distinguished from the shell of ''Crepidula adunca'' by: * Its larger size, * The apex is low and near the margin of the shell, curved to one side and not markedly hooked (rather than high, hooked and centrally placed), * The interior shelf is notched at the ends, rather than curved forward at both ends, and * The periostracum is more prominent.〔Morris, Robert H. 2002. Intertidal Invertebrates of California: 690〕 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「Crepidula onyx」の詳細全文を読む スポンサード リンク
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