Eric Walker added Therapsida to Sphenacodontoidea, and added Sphenacodontoidea to Sphenacodontia

Eric Walker added Sphenacodontoidea to Sphenacodontia, and added Sphenacodontia to Sphenacomorpha

Eric Walker added Dicynodontia and Eutherapsida and Therapsid - Wikipedia to Therapsida, and added Therapsida to Sphenacodontoidea