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

Eric Walker added Sphenacomorpha to Haptodontiformes, and added Haptodontiformes to Eupelycosauria

Eric Walker added Haptodontiformes to Eupelycosauria, and added Eupelycosauria to Synapsids