Full reference: J. M. Clark and J. A. Hopson. 1985. Distinctive mammal-like reptile from Mexico and its bearing on the phylogeny of the Tritylodontidae. Nature 315(6018):398-400
Sister taxa: none
Type specimen: IGM 3492, a skull. Its type locality is Huizachal Canyon, which is in a Pliensbachian floodplain siltstone in the La Boca Formation of Mexico.