| 词条 | Otarocyon |
| 释义 |
| fossil_range = {{Fossil range|Early Oligocene|Late Oligocene}} | taxon = Otarocyon | authority = Wang, Tedford, & Taylor, 1999 | type_species = †Cynodesmus cooki | subdivision_ranks = Species | subdivision =
| range_map = Otarocyon range.png | range_map_caption = Range of Otarocyon based on fossil distribution }}Otarocyon ("large eared dog") is an extinct genus of the family Borophaginae ("bone-crushing dog"). It was a terrestrial canine which was small in size endemic to North America during the Orellan and Geringian stages of the Oligocene epoch, about 33.3—20.6 Ma (million years ago).[1] TaxonomyOtarocyon was a small borophagine characterized by a short, broad skull, a specialized middle ear, simple, tall premolar teeth, and molars that are incipiently adapted to a hypocarnivore diet. Despite its Oligocene age, the skull of Otarocyon shows several striking similarities to the living fennec fox (Vulpes zerda), particularly in the structure of its middle ear. The similarities are probably convergent, but they suggest that Otarocyon may have been similar in its appearance and habits.[2]MorphologyFossil specimens of two individuals' body mass were examined by Legendre and Roth.[3]
Species
In addition to its earlier age, O. macdonaldi differs from O. cooki in being smaller and in showing lesser development of the specializations that characterize the genus. O. macdonaldi is also the earliest known member of the subfamily Borophaginae, although the later appearing Archaeocyon was more primitive. Sister generaArchaeocyon, Oxetocyon and Rhizocyon. Fossil distribution
References1. ^PaleoBiology Database: Otarocyon Taxonomy, Species {{Canidae extinct nav}}{{Taxonbar|from=Q583006}}2. ^Phylogenetic systematics of the Borophaginae (Carnivora, Canidae) 3. ^S. Legendre and C. Roth. 1988. Correlation of carnassial tooth size and body weight in recent carnivores (Mammalia). Historical Biology 6 : Borophagines|Oligocene carnivorans|Chattian genus extinctions|Oligocene mammals of North America|Prehistoric mammal genera|Fossil taxa described in 1999 |
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