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Isognomon radiatus : ウィキペディア英語版 | Isognomon radiatus
''Isognomon radiatus'', Lister's tree oyster or the radial purse oyster, is a species of bivalve mollusc in the family Pteriidae. It can be found along the Atlantic coast of North America, ranging from southern Florida to Brazil and Bermuda. ==Description== Lister's tree oyster is an irregular, fan-shaped shell growing to about long. Each valve is a pale brown colour with whitish rays radiating from the umbo, the raised hump that is the first part of the shell to form when the animal is a juvenile. There are numerous sculptured concentric rings on the outside surface. It is attached to a hard substrate by byssus threads and often occurs in clusters.
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「Isognomon radiatus」の詳細全文を読む
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