Genus: Rotaurisaurus YATES, 1999
Etymology: Latin, rotundus, “circular”, Latin, auris, “ear”, and latinised Greek, sauros, “lizard”: Circular ear lizard.

Species: contundo YATES, 1999
Etymology: Latin, cuntundere, "to squash": Referes to the preservation of the holotype.

Holotype: UTGD 87795

Locality: Crisp and Gunn’s Quarry, West Hobart, Tasmania, Australia.

Horizon: Red siltstone, about 12 m from the base of Poets Road Member of the Knocklofty Sandstone.


Age: Dinererian Substage, Early Nammalian Stage, Middle Scythian (Early Triassic) Epoch, Early Triassic.

Material: Crushed skull and probably associated incomplete left mandibular ramus of an ?adult individual.