Full reference: R. C. Fox, G. P. Youzwyshyn, and D. W. Krause. 1992. Post-Jurassic mammal-like reptile from the Palaeocene. Nature 358:233-235
Sister taxa: none
Type specimen: UALVP 32358, a mandible (left ddentary with three posteriormost teeth). Its type locality is Cochrane 2, which is in a Ti1 fluvial-lacustrine siltstone in the Paskapoo Formation of Canada.