Category:Sphenacodontoidea
From EverybodyWiki Bios & Wiki
Articles relating to the Sphenacodontoidea, a node-based clade that is defined to include the most recent common ancestor of the Sphenacodontidae and the Therapsida and their descendants (including mammals). They are defined according to a number of specialised characteristics concerning proportions of the bones of the skull and the teeth.
