Rhigosaurus glacialis is a species of therocephalian therapsid. Its fossilized remains have been found in the Fremouw Formation of Antarctica and Australia. Part of a juvenile skull was found near Mount Kenyon, Antarctica. The holotype of the partial skull shows evidence of promiment upper and lower canine teeth.[1]
The genus name Rhigosaurus comes from the Greek Greek, Modern (1453-);: rhigos, meaning cold, and Greek, Modern (1453-);: sauros, meaning lizard or reptile. The name was coined by Edwin Harris Colbert and James William Kitching, who described the species in 1981 based on a fossil found in 1970-1971. They described it as robust and small in size. The fossil skull was NaN36 long and NaN26 across at the widest point.[2]
Modern paleontologists such as Christian Sidor consider the species a nomen dubium. Sidor describes it as an "indeterminate juvenile baurioid" and suggests that the name Rhigosaurus be discontinued.[3]