Sphenacodontoidea


Sphenacodontoidea is a node-based clade that is defined to include the most recent common ancestor of the Sphenacodontidae and the Therapsida and their descendants. They are defined according to a number of specialised characteristics concerning .
The Sphenacodontoidea evolved from earlier Sphenacodontia such as Haptodus via a number of transitional stages of small, unspecialised pelycosaurs.

Classification

The following taxonomy follows Fröbisch et al. and Benson unless otherwise noted.
Class Synapsida