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Oregonia bifurca
''Oregonia bifurca'', commonly known as the split-nose crab or the split-nose decorator crab, is a species of crabs belonging to the genus ''Oregonia''. It is a rare deep-water species that inhabits the tops of seamounts and guyots in the northeastern Pacific Ocean; from the Aleutian Islands, the Bering Sea, the Hawaiian–Emperor seamount chain, to the waters off British Columbia. It is closely related to the more common shallow-water species ''Oregonia gracilis'', the graceful decorator crab.
Like other majoid crabs, ''Oregonia bifurca'' are sexually dimorphic, with males larger than the females. The carapace length is about in males and in females. The entire body and the long and slender legs are covered densely with curving yellow hair.
==Taxonomy==
''Oregonia bifurca'' is one of the two extant species classified under the genus ''Oregonia'', the other being the graceful decorator crab (''Oregonia gracilis''). It belongs to the family Oregoniidae under the superfamily Majoidea ("spider crabs"). It was first described by the American carcinologist Mary J. Rathbun in 1902. The single type specimen (a female) was collected from a depth of about in the waters north of the Rat Islands of the Aleutian island chain (USS ''Albatross'' station 3785).
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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