Chiniquodon.

This list of therapsids is an attempt to create a comprehensive listing of all genera that … Therapsids were the stock that gave rise to mammals.

Synapsids —not to be confused with therapsids, which are a subordinate group to synapsids—are a group of animals that includes mammals and every animal more closely related to mammals than to the other members of the amniote clade, such as reptiles and birds.

Despite this nickname, therapsids were neither mammals nor reptiles, but an intermediate stage between the two classes. ... Anteosaurus looked remarkably like a dinosaur caught halfway between evolving into a... Arctops .

Therapsids evolved from a permian pelycosaurs. Therapsids, also known as therapsida, are a group of synapsids that includes mammals ' early evolutionary ancestors, hence their nickname of 'mammal-like reptiles'. Some of the therapsids, or "mammal-like reptiles," of the Permianperiod were very mammal-like indeed. Meet the Therapsids—The "Mammal-Like Reptiles" The timing and sequence can't be pinned down precisely, but paleontologists believe that sometime during the early Permian period, a branch of pelycosaurs evolved into reptiles called "therapsids" (otherwise known as "mammal-like reptiles"). Pictures and Profiles of Therapsids Anteosaurus . Anteosaurus. Therapsid, any member of a major order (Therapsida) of reptiles of Permian and Triassic time (from 299 million to 200 million years ago). Therapsids were small to moderate-sized animals with several mammalian skeletal characteristics, such as: fewer bones in the skull than the other reptiles, differentiated teeth (incisors, canines, and cheek teeth) and a bony palate which permitted breathing while chewing. Chiniquodon .