From Wikipedia, the free encyclopedia
Jump to: navigation, search
Temporal range: Late Carnian
Adelobasileus BW.jpg
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
(unranked): Amniota
Class: Synapsida
Order: Therapsida
(unranked): Mammaliamorpha
Genus: Adelobasileus
Species: A. cromptoni
Binomial name
Adelobasileus cromptoni
Lucas & Hunt 1990

Adelobasileus cromptoni is a species of an extinct genus of mammal 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.

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.


  • Lucas, SG; Hunt, AP (1990). "The oldest mammal". New Mexico Journal of Science 30 (1): 41–49. 
  • Lucas, SG; Luo, Z (September 1993). "Adelobasileus from the upper Triassic of west Texas: the oldest mammal". J. Vert. Paleont 13 (3): 309–334. doi:10.1080/02724634.1993.10011512. 

External links[edit]