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Cancer (genus)
''Cancer'' is a genus of marine crabs in the family Cancridae. It includes 8 extant species and 3 extinct species, including familiar crabs of the littoral zone, such as the European edible crab (''Cancer pagurus''), the Jonah crab (''Cancer borealis'') and the red rock crab (''Cancer productus''). It is thought to have evolved from related genera in the Pacific Ocean in the Miocene.
==Description==
The species placed in the genus ''Cancer'' are united by the presence of a single posterolateral spine (on the edge of the carapace, towards the rear), anterolateral spines with deep fissures (on the carapace edge, towards the front), and a short extension of the carapace forward between the eyes.〔 Their claws are typically short, with grainy or smooth, rather than spiny, keels.〔 The carapace is typically oval, being 58%–66% as long as wide, and the eyes separated by 22%–29% of the carapace width.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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