Synapsida

Synapsids are a group of animals that includes mammals and every animal more closely related to mammals than to other living amniotes. They are easily separated from other amniotes by having a temporal fenestra, an opening low in the skull roof behind each eye, leaving a bony arch beneath each. For more information, visit the Wikipedia entry Get back to Animalia
†Cynognathus	†Dicynodonts	†Dimetrodon	†Edaphosaurus
†Estemmenosuchus	†Gorgonopsians	Mammals	†Moschops
†Procynosuchus	†Sphenacodon	†Trochosaurus