Adelobasileus
| Adelobasileus Temporal range:Late Triassic,
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|---|---|
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| Life restoration | |
Scientific classification
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Clade: | Cynodontia |
| Clade: | Mammaliamorpha |
| Genus: | †Adelobasileus Lucas & Hunt, 1990 |
| Species: | †A. cromptoni
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| Binomial name | |
| †Adelobasileus cromptoni | |
Adelobasileusis a genus ofmammaliamorphcynodontsfrom theLate Triassic(CarniantoRhaetian), about 225 - 220 million years ago. It is known only from a partial skull recovered from theTecovas Formationin westernTexasand partial specimen fossils from theChinle FormationinArizona,Southern United States.The species name isAdelobasileus cromptoni.
Adelobasileuspredates and descends from the non-mammalian cynodontsTritylodontidaeandTritheledontidaeby 10 million years. Distinctcranialfeatures, especially the housing of thecochlea,suggest thatAdelobasileusis atransitional formin the character transformation from non-mammaliaform cynodonts to mammaliaforms. For this reason, it is thought to be a close relative of thecommon ancestorof all modern mammals. Though formerly classified as a mammal by trait-based taxonomy, it is outside thecrown groupcontaining all true mammals.[1]
References
[edit]- ^Rowe, T. S. (1988)."Definition, diagnosis, and origin of Mammalia"(PDF).Journal of Vertebrate Paleontology.8(3): 241–264.doi:10.1080/02724634.1988.10011708.
Sources
[edit]- 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 and central Arizona: the oldest mammal".J. Vertebr. Paleontol.13(3): 309–334.doi:10.1080/02724634.1993.10011512.
External links
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