Full reference: N. D. Newell. 1957. Notes on certain primitive heterodont pelecypods. American Museum Novitates 1857:1-14
Sister taxa: none
Type specimen: AMNH 28016. Its type locality is AMNH342, Torrey Lake, which is in a Wordian shallow subtidal limestone in the Park City Formation of Wyoming.
Average measurements (in mm): shell length 125.0, valve length 247.6