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''Rhizocyon'' ("root dog") is an early member of the subfamily Borophaginae, an extinct subgroup of canids that were endemic to western North America during the Whitneyan and Arikareean stages) of the Oligocene epoch, living from ~33.3—20.6 Ma., existing for approximately . ''Rhizocyon'' was similar to a contemporary species, ''Archaeocyon leptodus'', from the Great Plains, but it shows a few subtle differences in the structure of the skull and dentition that indicate that ''Rhizocyon'' may be close to the ancestry of later borophagines. Only a single species, ''R. oregonensis'', is known and all fossils come from the John Day Formation in Oregon. ==Morphology== Fossil specimens of two individuals' body mass were examined by Legendre and Roth.〔S. Legendre and C. Roth. 1988. Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia). Historical Biology〕 *Specimen 1: . *Specimen 2: . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rhizocyon」の詳細全文を読む スポンサード リンク
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