Temporal range: Upper Triassic 225 mya
Skull features, such as the housing of the cochlea, suggest that Adelobasileus is a transitional form in the evolution from cynodonts to end-Triassic mammals. For this reason, it may be close to the common ancestor of modern mammals. They move very fast according to the history of their sleek body type.
- Lucas S.G. & Hunt A.P. 1990. The oldest mammal. New Mexico Journal of Science 30 (1): 41–49.
- Lucas S.G. & Luo Z. 1993. Adelobasileus from the upper Triassic of west Texas: the oldest mammal. J. Vert. Paleont 13 (3): 309–334.