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''Janolus'' is a genus of small to large sea slugs, or more accurately nudibranchs, marine gastropod mollusks, in the family Proctonotidae.〔 The name ''Janolus'' is derived from the two-headed god Janus, in ancient Roman mythology. Although these nudibranchs superficially resemble aeolid nudibranchs, this genus is in fact in the suborder Arminina. ==Description== Adult individuals of ''Janolus'' species can be between 2.5 cm to 8 cm long, depending on the species. They are semi-translucent and the body is covered in short cerata. The color of the cerata varies according to the species: in ''Janolus fuscus'' the cerata are orange and white tipped, whereas in ''Janolus barbarensis'' they are orange and blue tipped. 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「Janolus」の詳細全文を読む スポンサード リンク
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