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Cratera (genus) : ウィキペディア英語版 | Cratera (genus)
''Cratera'' is a genus of land planarians from South America. == Description == The genus ''Cratera'' is characterized by having a leaf-shaped body. Most species are between 3 and 7 cm long. The hundreds of eyes distributed along the body are monolobulated, i.e., simple and circular. The copulatory apparatus has a permanent conical penis occupying the entire male cavity. The final portion of the ejaculatory duct, the channel that guides sperm through the penis, has an expanded cavity that resembles a volcanic crater. It is very similar to the related genus ''Obama'', the main difference being the presence of trilobulated eyes in the latter.
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「Cratera (genus)」の詳細全文を読む
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