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dwarf sperm whale
The dwarf sperm whale (''Kogia sima'', formerly ''Kogia simus'') is one of three extant species in the sperm whale family. They are not often sighted at sea, and most extant information comes from the study of stranded carcasses.
==Taxonomy==
Today, the dwarf sperm whale is generally classified as one of two species, along with the pygmy sperm whale, in the Kogiidae family and ''Kogia'' genus. It was not until 1966 that the two species were regarded as separate. Most taxonomists regard the family Kogiidae as belonging to the superfamily Physeteroidea, though some consider this taxon to be a subfamily (Kogiinae) of the family Physeteridae.
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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