Ciri yang membedakan Eupelycosauria denganCaseasauria berdasarkan pada detil proporsi tulang tertentu di tengkoral. Termasuklah tulang subratemporal sempit (sementara caseasauria besar) dan tulang depan dengan hubungan lebih lebar ke margin atas orbit
Batang utama Eupelycosauria berisikan dua cabang berikut setelah terpisah dengan Varanopseidae dan Opiacodonthidae, yaitu
Edaphosauridae
Sphenacodontia
Referensi:
Colbert EH (1969), Evolution of the Vertebrates. John Wiley & Sons.
Hopson JA & HR Barghusen (1986), An analysis of therapsid relationships in N Hotton, III, PD MacLean, JJ Roth & EC Roth (eds.), The Ecology and Biology of Mammal-like Reptiles, Smithsonian Inst. Press, pp. 83-106.
Lund R (2000), The new actinopterygian order Guildayichthyiformes from the Lower Carboniferous of Montana (USA). Geodiversitas 22: 171-206.
Modesto SP (1995), The skull of the herbivorous synapsid Edaphosaurus boanerges from the Lower Permian of Texas. Palaeontology, 38: 213–239.
Modesto SP, CA Sidor, BS Rubidge & J Welman (2001), A second varanopseid skull from the Upper Permian of South Africa: implications for Late Permian 'pelycosaur' evolution. Lethaia 34: 249-259.
Reisz RR (1986), Pelycosauria, Encylopedia of Paleoherpetology, Part 17A, Fischer Verlag.
Ruxton GD (2001), Heat loss from giant extinct reptiles. Proc. R. Soc. Lond. B 268: 1921–1924.
Sumber gambar : http://scienceblogs.com/tetrapodzoology/2007/07/survivors_diggers_herbivores_f.php
