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 Sphenacodontia to Sphenacomorpha, and added Sphenacomorpha to Haptodontiformes