| Adelobasileus Temporal range: Late Triassic, | |
|---|---|
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| Life restoration | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Clade: | Cynodontia |
| Clade: | Mammaliamorpha |
| Genus: | † Adelobasileus Lucas & Hunt, 1990 |
| Species: | †A. cromptoni |
| Binomial name | |
| †Adelobasileus cromptoni | |
Adelobasileus cromptoni is a genus of mammaliamorph cynodonts from the Late Triassic (Carnian to Rhaetian), about 225 - 220 million years ago. It is known only from a partial skull recovered from the Tecovas Formation in western Texas and partial specimens from the Chinle Formation in Arizona, Southern United States.
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Distinct cranial features, especially the housing of the cochlea, suggest that Adelobasileus is a transitional form in the character transformation from non-mammaliaform cynodonts to mammaliaforms. For this reason, it is thought to be a close relative of the common ancestor of all modern mammals. Though formerly classified as a mammal by trait-based taxonomy, it is currently placed outside the crown group containing all true mammals. [1]
