Adelobasileus

Adelobasileus is a genus of mammal-like synapsid from the Late Triassic (Carnian), about 225 million years ago. It is known only from a partial skull recovered from the Tecovas formation in western Texas, southern United States, referred to the species Adelobasileus cromptoni.

Adelobasileus Temporal range: Late Triassic, 225 Ma PreЄ Є O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Therapsida
Clade:	Cynodontia
Genus:	†Adelobasileus Lucas & Hunt, 1990
Species:	†A. cromptoni
Binomial name
†Adelobasileus cromptoni Lucas & Hunt, 1990

Roughly contemporary with the mammaliaform Tikitherium, Adelobasileus predates the non-mammalian cynodonts Tritylodontidae and Tritheledontidae by 10 million years. In fact, distinct cranial features, especially the housing of the cochlea, suggest that Adelobasileus is a transitional form in the character transformation from cynodonts to Triassic mammals. For this reason, it is thought to be the common ancestor of all modern mammals or a close relative of the common ancestor. Though traditionally classified as a mammal by trait-based taxonomy, it is outside the crown group containing all true mammals.[1]