Synapsids

Mammals
(reptile-like mammals) (Pelycosaur)
 * † (Dimetrodon)
 * (upright)
 * Eutherapsida
 * † ia
 * † ia
 * † ia (Lystrosaurus)
 * ia
 * ia
 * ia
 * (mammals)
 * † (Dimetrodon)
 * (upright)
 * Eutherapsida
 * † ia
 * † ia
 * † ia (Lystrosaurus)
 * ia
 * ia
 * ia
 * (mammals)
 * Eutherapsida
 * † ia
 * † ia
 * † ia (Lystrosaurus)
 * ia
 * ia
 * ia
 * (mammals)
 * ia
 * ia
 * ia
 * (mammals)
 * ia
 * (mammals)