Species: simus SEELEY, 1895
Etymology: Greek, simos, "flat nose."
Holotype: BMNH R2582
Locality: Molteno Pass, Nieuweveld, Beaufort West, Western Cape Province, South Africa.
Horizon: Hoedemaker member, Middle Teekloof Formation.
Biostratigraphy: Tropidostoma zone (Tropidostoma-Endothidon Assemblage zone KEYSER, 1979, SACS, 1980, Tropidostoma microtrema zone KEYSER & SMITH, 1977-78, Lower Cistecephalus zone KITCHING, 1970, 1977, Endothiodon zone, WATSON, 1914).
Age: Tatarian Age, Lopingian Subepoch, Zechstein Epoch, Late Permian.
Material: Anterior part of skull.