PaleoDB taxon number: 373710
Full reference: W. J. Zinsmeister. 1983. New Late Paleocene molluscs from the Simi Hills, Ventura County, Califonia. Journal of Paleontology 57(6):1282-1303
Type specimen: UCR 6873/181, a shell. Its type locality is Meier Canyon, which is in a Thanetian open shallow subtidal conglomerate in the Simi Formation of California.
Average measurements (in mm): shell 12.0 x 14.0