| 词条 | Rhizocyon |
| 释义 |
| fossil_range = early Oligocene | display_parents = 2 | genus = Rhizocyon | parent_authority = Wang, Tedford, & Taylor, 1999 | species = oregonensis | authority = (Merriam, 1906) | range_map = Rhizocyon range.png | range_map_caption = Range of Rhizocyon based on fossil distribution }} 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 {{Mya|33.3-20.6|million years}}. 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. MorphologyFossil specimens of two individuals' body mass were examined by Legendre and Roth.[1]
Fossil distribution
Sister genera
Notes1. ^S. Legendre and C. Roth. 1988. Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia). Historical Biology References{{refbegin}}
7 : Borophagines|Oligocene canids|Aquitanian genus extinctions|Oligocene mammals of North America|Prehistoric mammal genera|Rupelian genus first appearances|Taxa named by Xiaoming Wang |
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