Olivierosuchus
Olivierosuchus is an extinct genus of therocephalian therapsids. It is a member of the family Akidnognathidae. Fossils of "Olivierosuchus" have been found from the Early Triassic "Lystrosaurus" Assemblage Zone in South Africa. Unlike other akidnognathids such as "Moschorhinus", it has a narrow snout and fewer postcanine teeth. As a distinguishing feature, "Olivierosuchus" also has a sharp ridge near the choana, an opening in the skull palate. Bumps and projections cover the pterygoid, a bone that forms part of the palate. "Olivierosuchus" was a top predator of the lower "Lystrosaurus" Assemblage Zone (LAZ) and lived alongside other large therapsids like  Moschorhinus. The high diversity of akidnognathids in the LAZ suggests that the group recovered quickly from the Permian-Triassic extinction event, a mass extinction in which many other therapsid groups disappeared. A burrow cast described in 2010 from the LAZ has been attributed to "Olivierosuchus" or a related therocephalian. The burrow is straight and wide and includes an entry ramp and living chamber. Remains of a juvenile "Lystrosaurus" dicynodont were found in the cast, but the individual was likely too small to dig the burrow. It is possible that the burrow was home to an "Olivierosuchus" that had stashed the  remains of the dicynodont as its prey in the tunnel. Carnivorous tetrapods typically create straight burrows and often store food in them, providing evidence for this interpretation of the South African burrow.