Toxodontia
Toxodontia Temporal range:
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Mixotoxodon | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | †Notoungulata |
Suborder: | †Toxodontia |
Families[2] | |
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Toxodontia
Description
Notohippidae was also present during the Casamayoran but tend to have more hypsodont cheek teeth than isotemnids. Pampahippus, one of the earliest genera in this family was, nevertheless, low-crowned with densely packed cheek teeth. Its primitiveness is suggested by the retained paraconids on the lower molars. Eomorphippus, a Mustersan notohippid, was moderately hypsodont, Deseadan genera such as Rhynchippus and Eurygenium were very high-crowned, and Santacrucian genera had acquired cementum on the crowns similar to equids.[4]
The last toxodont family from the early Tertiary are the
Toxodontids first appeared during the Oligocene in the form of Proadinotherium. Another well-known toxodontid is Nesodon, a medium-sized Miocene toxodontid descended from Proadinotherium which had converted its second upper incisors into tusks. Toxodon itself evolved during the Pliocene alongside the related Trigodon, an equally large mammal which possessed a horn projecting from its forehead, in the same way as a modern rhinoceros. Toxodon was a huge herbivore (about the size of a modern black rhinoceros) with four toes on each foot.
Notes
- S2CID 232116246.
- ^ "Toxodonta". Mikko's Phylogeny Archive. Archived from the original on June 22, 2013. Retrieved 26 June 2009.
- ^ Toxodontia in the Paleobiology Database. Retrieved April 2013.
- ^ a b c d Rose 2006, pp. 230–1
References
- McKenna, Malcolm C.; Bell, Susan K. (1997). Classification of Mammals Above the Species Level. New York: Columbia University Press. OCLC 37345734.
- Rose, Kenneth David (2006). The beginning of the age of mammals. Baltimore: JHU Press. ISBN 0801884721.