Hesperocyoninae

Hesperocyoninae
Temporal range: Late Eocene–Middle Miocene
Skull of Mesocyon coryphaeus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Subfamily: †Hesperocyoninae
Genera

The extinct Hesperocyoninae are one of three subfamilies found within the canid family. The other two canid subfamilies are the extinct Borophaginae and extant Caninae.[1]

Taxonomic history

Canid subfamilies
 Canidae 

†Hesperocyoninae

Hesperocyoninae are basal canids that gave rise to the other two canid subfamilies, the Borophaginae and Caninae.[2] This 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. Four major lineages can be defined based on shared characteristics:

The genus Caedocyon, which is only known from a single partial cranium that shows some Paraenhydrocyon affinities, probably represents another independent lineage.[3]

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, Hesperocyon coloradensis provides an important link between H. gregarius and the Mesocyon-Enhydrocyon clade.[3]

Extinction

According to an analysis of the fossil record of North American fossil carnivorans, the decline of hesperocyonines to extinction during the period from about 20 to 10 million years ago was driven by competition with felids and borophagines.[4]

  • Fluctuation of species within Canidae over 40 million years
    Fluctuation of species within Canidae over 40 million years
  • Phylogeny of Hesperocyoninae related to Borophaginae and canines by R.L. Tedford, 1977
    Phylogeny of Hesperocyoninae related to Borophaginae and canines by R.L. Tedford, 1977
  • Hesperocyoninae species per unit of time
    Hesperocyoninae species per unit of time

References

  1. ^ Miklosi, Adam (2015). Dog Behaviour, Evolution, and Cognition. Oxford Biology (2 ed.). Oxford University Press. pp. 103–107. ISBN 978-0199545667.
  2. ^ Wang, X.; Tedford, R.H. (2008). Dogs, Their Fossil Relatives and Evolutionary History. Columbia University Press. pp. 23–31. ISBN 978-0-231-13528-3.
  3. ^ a b Wang, X. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora, Canidae). Bulletin of the American Museum of Natural History, 221:1-207.
  4. ^ Silvestro, D.; Antonelli, A.; Salamin, N.; Quental, T. B. (2015). "The role of clade competition in the diversification of North American canids". Proceedings of the National Academy of Sciences. 112 (28): 8684–8689. Bibcode:2015PNAS..112.8684S. doi:10.1073/pnas.1502803112. PMC 4507235. PMID 26124128.

Further reading

  • Xiaoming Wang, Richard H. Tedford, Mauricio Antón, Dogs: Their Fossil Relatives and Evolutionary History, New York : Columbia University Press, 2008; ISBN 978-0-231-13528-3


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