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Akera
''Akera'' is a marine genus of sea hare in the family Akeridae, known from the late Callovian (Jurassic) to the recent periods.〔Gofas, S. (2012). Akera O.F. Müller, 1776. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137641 on 2012-03-31〕〔(Sepkoski's Online Genus Database ). Downloaded 14 October 2008.〕 ==Description== ''Akera'' is a primitive genus. These sea hares do not fit completely in their external shell; it just covers their visceral hump which is positioned at the posterior end of their bodies. Their streamlined bodies are adapted for burrowing.
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「Akera」の詳細全文を読む
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