Mammaliamorpha
Mammaliamorpha is a clade of cynodonts. It contains the clades Tritylodontidae and Mammaliaformes, as well as a few genera that do not belong to either of these groups. The family Tritheledontidae has also been placed in Mammaliamorpha by some phylogenetic analyses, but has been recovered outside the clade by others.[1] According to a 2022 study based on inner ear anatomy, Mammaliamorpha may be the clade in which endothermy ("warm-bloodedness") first appeared in the mammalian lineage.[2]
| Mammaliamorphs | |
|---|---|
 | |
| Skull of Kayentatherium wellesi, a tritylodontid | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Clade: | Cynodontia |
| Clade: | Prozostrodontia |
| Clade: | Mammaliamorpha Rowe, 1988 |
| Subgroups | |
Classification
Mammaliamorpha was named in 1988 by the American palaeontologist Timothy B. Rowe, who defined it as comprising "the last common ancestor of Tritylodontidae and Mammalia, and all its descendants".[3]
The cladogram below is adapted from the 2019 description of the mammaliamorph Pseudotherium by Rachel V. S. Wallace and colleagues:[1]
| Probainognathia |
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
References
- Wallace, R. V. S.; Martínez, R.; Rowe, T. (2019). "First record of a basal mammaliamorph from the early Late Triassic Ischigualasto Formation of Argentina". PLOS ONE. 14 (8): e0218791. doi:10.1371/journal.pone.0218791.
- Araújo; et al. (28 Jul 2022). "Inner ear biomechanics reveals a Late Triassic origin for mammalian endothermy" (PDF). Nature. 607. doi:10.1038/s41586-022-04963-z.
- Rowe, Timothy (1988). "Definition, diagnosis, and origin of Mammalia". Journal of Vertebrate Paleontology. 8 (3): 241–264. doi:10.1080/02724634.1988.10011708.
