Cynodontia

Cynodontia memiliki tampilan paling mirip mamalia, seperti gigi yang membesar, lamina lenyap, palate sekunder bertulang, dentisi postcanine, rusuk lumbar lenyap dan begitu juga parasagittal gait, dengan mamalia pertama sejati muncul pada akhir zaman Trias.
Cynodontia terbagi menjadi
Diviniidae
Mammalia
Procynosuchidae
Galesauridae
Thrinaxodontidae
Cynognathidae
Gomphodonta
Chiniquodontidae
Probainognathidae
Tritheledontidae

Referensi :
Hopson, JA (1991), Systematics of the nonmammalian Synapsida and implications for patterns of evolution in synapsids, in H-P Schultze & L Trueb [eds], Origins of the Higher Groups of Tetrapods: Controversy and Consensus. Comstock, pp. 635-693
Rowe, T (1996), Coevolution of the mammalian middle ear and neocortex. Science 273: 651-654

Sumber gambar : http://www.bertsgeschiedenissite.nl/geschiedenis%20aarde/cynodontia.htm