Full reference: R. Estes and B. SanchÝz. 1982. New discoglossid and palaeobatrachid frogs from the Late Cretaceous of Wyoming and Montana, and a review of other frogs from the Lance and Hell Creek Formations. Journal of Vertebrate Paleontology 2(1):9-20
Sister taxa: none
Type specimen: UCMP 125827, a set of postcrania. Its type locality is Bushy Tailed Blowout, which is in a Lancian terrestrial horizon in the Lance Formation of Wyoming.