A moderately coherent group of primitive reptiles constituting an order of the subclass Anapsida. Most members are characterized by a closed cheek (temporal) region. The order is divided into four suborders: Captorhinomorpha, Millerosauria, Procolophonia, and Pareiasauria. Except for the Procolophonia, which continue into the Late Triassic, Captorhinida are confined to the Permo-Carboniferous. They lived in lowlands, where they were associated with amphibians and synapsid reptiles. Some of the smaller animals of the Captorhinomorpha and the Millerosauria fed primarily on insects and small vertebrates, but the larger genera were exclusively herbivorous. Along with the caseid pelycosaurs, they were the dominant consumers of vegetation in the middle Permian ecosystems.