|
The Hesperocyoninae are a subfamily of extinct canids. ==Taxonomic history== The subfamily ''Hesperocyoninae'' was named by Martin (1989). The members were reassigned to the family Canidae (with no subfamily) by Xiaoming Wang in 1999.〔X. Wang, R. H. Tedford, and B. E. Taylor. 1999. (Phylogenetic systematics of the Borophaginae (Carnivora: Canidae) ). Bulletin of the American Museum of Natural History 243:1-392〕 ''Hesperocyoninae'' are basal canids that, according to Wang and Tedford, gave rise to the other canid groups, such as the Borophaginae and Caninae. This disused subfamily was endemic to North America, living from the Duchesnean stage of the Late Eocene through to the early Barstovian stage of the Miocene, lasting around 20 million years. It comprises 10 recognized genera and 26 recognized species; among these, four genera and species are new. Four major lineages can be defined based on shared characteristics: *''Mesocyon''-''Enhydrocyon'' clade *''Osbornodon'' clade *''Paraenhydrocyon'' *''Ectopocynus clade'' The genus ''Caedocyon'' probably forms a distinct clade of its own. ''Hesperocyon'', which lacks the shared derived characters that would include it within any of the aforementioned clades, is possibly ancestral to many of the lineages. Some evidence indicates the ''Paraenhydrocyon'' clade may be directly descended from ''Hesperocyon gregarius''. According to Xiaoming Wang,〔Wang, X. 1994. (Phylogenetic systematics of the Hesperocyoninae (Carnivora, Canidae) ). Bulletin of the American Museum of Natural History, 221:1-207. 〕 ''Hesperocyon coloradensis'' provides an important link between ''H. gregarius'' and the ''Mesocyon-Enhydrocyon'' clade. 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「Hesperocyoninae」の詳細全文を読む スポンサード リンク
|