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Oregonia (genus) : ウィキペディア英語版
Oregonia (genus)

''Oregonia'' is a genus of crabs, comprising two extant species and one fossil species: It is classified under the family Oregoniidae under the spider crab superfamily Majoidea.〔
==Description==
The members of the genus are characterized by subtriangular or suboblong carapaces moderately covered with small protrusions (tubercles). They have large spines on the rear margins of the eye orbits (the postorbital spine) that are situated quite far from the eyestalks. The male chelipeds are elongated. The palms (manus) of the claws are long, compressed, and widen on the outer ends. The walking legs (pereiopods) are slender and decrease in length regularly towards the back. The abdomen (pleon) has seven segments.

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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