Mammaliamorpha

Mammaliamorphs; Temporal range: Late Triassic (Carnian), ; 232–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Skull of Kayentatherium wellesi, a tritylodontid
	Manatee
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Clade:	Cynodontia
Clade:	Prozostrodontia
Clade:	Mammaliamorpha; Rowe, 1988
Subgroups
	†Adelobasileus; †Botucaraitherium; †Brasilodon; †Pseudotherium?; †Sinoconodon; †Tikiodon; †Tritylodontidae; †Tritheledontidae?; Mammaliaformes;

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]

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]