Bivalvia - Ostreida - Gryphaeidae

Full reference: R. L. Squires and R. Demetrion. 1990. New Eocene Marine Bivalves from Baja California Sur, Mexico. Journal of Paleontology 64(3):382-391

Belongs to Pycnodonte (Pegma) according to R. L. Squires and R. Demetrion 1990

Sister taxa: none

Type specimen: IGM 5069, a shell

Ecology: stationary epifaunal suspension feeder