The face is much shorter than any other pelycosaur except edaphosaurs. The supratemporal in "Eothyris parkeyi" is much more extremely developed than in any other pelycosaur. The skull measure of "Eothyris parkeyi" is an extremely smaller than for a pelycosaur. "Varanops" was a large pelycosaur, around the size of the modern monitor lizards. The biggest carnivorous pelycosaur was "Dimetrodon angelensis", which could reach and . Caseasauria refers to a pelycosaur side-branch, or clade, that did not leave any descendants. "Pantelosaurus" was first described by von Huene (1925) as a pelycosaur. Mammal-like Reptiles' or pelycosaur is based on the morphology of their dentary and marginal teeth.