Titanophoneus potens (Efremov 1938) Middle Permian, 3-5 m length was a basal dinocephalid derived from Phthinosuchus (above). So, it's not a basal dinocephalian, but basal to the tapinocephalids. It emphasized the anterior interlocking teeth while reducing the posterior teeth.

Overall larger than and distinct from Biarmosuchus, the skull of Titanophoneus had a further upturned premaxilla. Only after the canine did the maxilla turn back toward the jaw joint. The jugal descended creating a slightly larger lateral fenestra. The skull roof was narrower. The bones over each orbit were more robust, perhaps for head-banging rituals that were taken to further extremes in Ulemosaurus (see below). The reflected lamina was further separated from the rest of the jaw. The anterior teeth were larger and interlocked.

The dorsal neural spines were angled posteriorly. The caudal neural spines were greatly reduced. The dorsal ribs were deeper, enclosing a larger gut, another trait of plant-eaters. The ventral pelvis was shorter. The fibula was relatively more gracile. The hands and feet were relatively smaller.

Broom R 1911. On some new South African Permian reptiles. Proceedings of the Zoological Society of London 81(4):1073-1082.

Efremov IA 1938. The Recovery of a Triassic Anomodont in the Orenburg Province: Comptes Rendus Doklady l’Academie des Sciences de l’Union des Sovietiques Socialistes Republiques 20 (2-3): 227-229.

Gregory W 1926. The skeleton of Moschops capensis, a dinocephalian reptile from the Permian of South Africa. Bulletin of the American Museum of Natural History 56 (3): 179–251.

Hopson JA and Barghusen HR 1986. An Analysis of Therapsid Relationships. Pp. 83-106 in The Ecology and Biology of Mammal-Like Reptiles ed. by Nocholas Hotton III, Paul D. MacLean, Jan J. Roth and E. Carol Roth, Smithsonian Institute Press, Washington and London.

Orlov YA 1958. The carnivorous dinocephalians of the Isheevo fauna (titanosuchians). Trudi. Paleon. Inst., Acad. Sci. U.S.S.R. 72: 3-113

wiki/Titanophoneus