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Temporal range: PermianUpper Triassic
with massive attachments for jaw muscles
Scientific classification
Cast of the skull of Kayentatherium.[1][2] It had a skull about 10cm (4 inches) in length.

The Cynodonts are a sub-order of the Therapsida. Cynodonts, one of the most diverse groups of therapsids, are named after their dog-like teeth.

The taxon is a clade which includes modern mammals and their extinct close relatives, the Mammaliaformes.

The cynodonts lived in all continents, and their fossil record begins in the Upper Permian 256 million years ago.[3]

The extinct members of the group were victims of the End-Triassic extinction event, but the line that led to the mammals survived.

References[change | change source]

  1. Kermack D. 1982. A new tritylodont from the Kayenta Formation of Arizona. Zoological Journal of the Linnean Society, 76 1-17.
  2. Sues, Hans-Dieter & F.A. Jenkins 2006. The postcranial skeleton of Kayentatherium wellesi from the Lower Jurassic Kayenta Formation of Arizona and the phylogenetic significance of postcranial features in tritylodontid cynodonts. In: Carrano Matthew T; Gaudin T.J; Blob R.W. and Wible J.R., Amniote Paleobiology: perspectivers on the evolution of mammals, birds, and reptiles. University of Chicago Press. 114-152
  3. PaleoBiology Database: Cynodontia, basic info