3. Tribe Therocephalia
Temporal opening large, bounded below by squamosal and jugal, above by the parietal or the connected postorbital and squamosal.[1] No quadratojugals[2]; quadrates small; a parietal foramen; squamosals large; no preparietal. Teeth conical, four or five in premaxilla; one or two large upper caniniform teeth, and five to nine smaller ones posteriorly; no secondary palate, or a rudimentary one (? Scaloposaurus); prevomers separated or fused (Scaloposaurus); an interpterygoidal opening; large posterior palatine vacuities; palate with few or no teeth; postfrontals small or absent; parietal region usually narrow. Mandible with loose symphysis, long dentary, and large coronoid; posterior elements not reduced. Postcranial skeleton largely unknown.
Family Scylacosauridae. Middle and Upper Permian. Alopecodon Broom, Pardosuchus Broom, Glanosuchus Broom, Scylacosaurus Broom, Pristerognathus Seeley, Ictidosaurus Broom, Alopecognathus Broom, Scylacorhinus Broom, South Africa.
Family Ictidosuchidae. Middle and Upper Permian. Ictidosuchus Broom, Arnognathus Broom, Cerdodon Broom, South Africa.
Family Lycosuchidae. Middle and Upper Permian. Lycosuchus Broom, Trochosuchus Broom, Hyaenasuchus Broom, South Africa.
Family Scaloposauridae. Middle and Upper Permian. Scaloposaurus Owen, Ictidognathus Broom, Simorhinella Broom, Icticephalus Broom, Akidnognathus Haughton, South Africa.
Family Alopecopsidae. Middle and Upper Permian. Alopecopsis Broom, Scymnopsis Broom, South Africa.
Family Whaitsidae. Whaitsia Haughton, South Africa.
Family doubtful. Middle and Upper Permian. Lycosaurus Owen, Eriphostoma Broom, Lycorhinus Broom, Scymnorhinus Broom, Alopecorhinus Broom, Scylacoides Broom, South Africa.
