Species: simus BROOM, 1905
Etymology: Greek, simos, "flat nose."
Holotype: SAM 5866
Locality: Aliwal North, Eastern Cape Province, South Africa.
Horizon: Burgersdorp Formation, Tarkastad Subgroup.
Biostratigraphy: Cynognathus zone (Kannemeyeria-Diademodon zone, KEYSER, 1979, SACS, 1980, Kannemeyeria zone, KEYSER & SMITH, 1977-77).
Age: Spathian Stage, uppermost Scythian Epoch to Anisian Stage, lowermost Mid Triassic Epoch, Early to Middle Triassic.
Material: Imperfect skull.