Millerettidae

Millerettidae is an extinct family of early reptiles from the Middle Permian to the Late Permian period (Capitanian - Changhsingian stages) of South Africa and possibly Russia. Although they were interpreted as a group of 'parareptiles', recent anatomical studies and phylogenetic analyses have suggested that they are better interpreted as close relatives of the Neodiapsida as part of the larger clade Parapleurota. The millerettids were small insectivores and probably resembled modern lizards in appearance and lifestyle, even possessing a tympanum, or eardrum, on the side of their skull.

Milleretta is an extinct genus of millerettid stem-group reptile from the Late Permian of what is now South Africa. Fossils have been found in the Balfour Formation. Its only known species is Milleretta rubidgei, although several other species of millerettid have been synonymized with this genus. Milleretta and its close relatives are unique among Paleozoic stem reptiles in that it secondarily closed an upper and lower temporal fenestra during ontogeny.

Millerosaurus is an extinct genus of millerettid reptiles from the Late Permian (Changhsingian stage) of South Africa. Jenkins et al. (2025) recognized both species of Millerosaurus as juvenile individuals of Milleretta, since the observed anatomical differences can be explained by changes seen through ontogeny in the latter. Under this reinterpretation, Millerosaurus would be a junior synonym of Milleretta.