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Eutheriodontia

eutheriodontia
1986

Groups

†Therocephalia
Cynodontia

Eutheriodontia is a clade of therapsids that includes therocephalians and cynodonts The clade was erected in 1986, and a close relationship between therocephalians and cynodonts has been recognized for many years Therocephalians and cynodonts are thought to have diverged in the Middle Permian, and each group independently evolved mammal-like features, including a secondary palate and the loss of a postorbital bar these features were retained in mammals, which are considered a derived group of cynodonts Mammalian features that both groups inherited from a common ancestor include the loss of teeth on the palate, the expansion of the epipterygoid bone at the base of the skull an area called the alisphenoid in mammals, and the narrowing of the skull roof to a narrow sagittal crest running between large temporal openings[1]

References

  1. ^ Rubidge, BS; Sidor, CA 2001 "Evolutionary patterns among Permo-Triassic therapsids" PDF Annual Review of Ecology, Evolution, and Systematics 32: 449–480 doi:101146/annurevecolsys32081501114113 Archived from the original PDF on 2012-03-21 


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    29.10.2014


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