Temporal range: Late Permian-Recent,
Examples of cynodonts.

1st row: Dvinia prima, Trirachodon berryi;
2nd row: Brasilitherium riograndensis, Megazostrodon rudnerae;
3rd row: Ornithorhynchus anatinus (platypus), Loxodonta africana (African bush elephant).

Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Eutheriodontia
Clade: Cynodontia
Owen, 1861

The cynodonts (lit.'dog-teeth') (clade Cynodontia) are a clade of eutheriodont therapsids that first appeared in the Late Permian (approximately 260 mya), and extensively diversified after the Permian–Triassic extinction event. Cynodonts had a wide variety of lifestyles, including carnivory and herbivory. Mammals are cynodonts, as are their extinct ancestors and close relatives, having evolved from advanced probainognathian cynodonts during the Late Triassic. All other cynodont lines went extinct, with the last known non-mammalian cynodont group, the Tritylodontidae, having its youngest records in the Early Cretaceous.

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