Millerosauria

Millerosauria is a proposed extinct order of early reptiles that contains the families Millerettidae and Eunotosauridae. It was named in 1957 by Watson and represents a group of reptiles that were thought to be ancestral to Eosuchia (a now-defunct clade roughly corresponding to the non-saurian Neodiapsida) and modern reptiles.^[1] Many cladistic studies have interpreted members of the Millerosauria as an early-diverging group of 'parareptiles', but some phylogenetic analyses have demonstrated that 'Parareptilia' represents a group of unrelated early reptiles and is therefore polyphyletic.^[2][3] In 2025, Jenkins et al. recovered the subgroup Millerettidae close to Neodiapsida as the earliest-diverging group in the clade Parapleurota.^[4]

Millerosauria Temporal range: Middle to Late Permian, 265.8–251 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Reconstructed skull of Milleretta
Fossil of Eunotosaurus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Subclass:	†Parareptilia
Order:	†Millerosauria Watson, 1957
Families
†Millerettidae †Eunotosauridae?
Synonyms
Millerosauroidea Romer, 1966

Eunotosaurus has been recovered as a stem-turtle in some cladistic studies.^[5]