Genus: Nythosaurus OWEN, 1876
Etymology:

Species: larvatus OWEN, 1876
Etymology: Greek, Obscure Lizard.

Holotype: NHMUK PV (old BMNH R847) R1715

Locality: "Tafelberg", Sneewberg, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Late Olenekian, Early Scythian Epoch, Early Triassic.

Material: Fragmentary skull.

Refereed material:

BMNH R 1715: Cast of brain-cavity.

Note: According to HAUGHTON & BRINK, 1954

Holotype: BMNH R 1715

Locality: East side of Commissie Drift, Caledon River, Free (Orange Free) State, South Africa.

Horizon: Katberg Formation, Beaufort Group.

Biostratigraphy: Lystrosaurus Assemblage zone (Lystrosaurus-Thrinaxodon zone, KEYSER, 1979, SACS, 1980, Procolophon zone, Lystrosaurus zone, WATSON, 1914, BROOM, 1906).

Age: Early Scythian Epoch, Early Triassic.

Material: Imperfect skull.