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northern right whale dolphin
The northern right whale dolphin (''Lissodelphis borealis'') is a small and slender species of marine mammal found in the North Pacific Ocean. It travels in groups of up to 2000, often with other cetaceans, in deep waters of the North Pacific. The dolphin is one of two species of right whale dolphin, the other being found in cooler oceans of the southern hemisphere.
==Classification==
The species was first described by Titian Peale in 1848. The genus ''Lissodelphis'' is placed within Delphinidae, the oceanic dolphin family of cetaceans.〔 The epithet of the genus was derived from Greek ''lisso'', smooth, and ''delphis''; the specific epithet, ''borealis'', indicates the northern distribution. The common names for the species formerly included northern right whale porpoise, snake porpoise, and Pacific right whale porpoise.〔 Both species in the genus are also referred to by the name right whale dolphin, a name derived from the right whales ''Eubalaena'', which also lack a dorsal fin.〔
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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