The large therocephalian hunters probably evolved in the north of Pangea, the single enormous Permian super-continent, before moving south. Gorgonopsids moved in the opposite
The largest ever gorgonopsids was Inostrancevia (after Russian geologist Alexander Inostrantzev - 40cm-48cm skull). When not being nasty to little Dicynodon, the
Inostrancevias most likely went after big pareiasaurs, like the heavily armored Scutosaurus.
Dicynodon, namesake of the dicynodont group, was one of the more common animals of its time. These tubby, low-slung
'two tuskers' pread from Southern Africa all the way to Central Asia.
Dicynodon species differed slightly but Russian D. trautscholdi can be compared with the South African D. trigonocephalus.