Bivalvia - Ostreida - Gryphaeidae
Alternative spelling: Pegma
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
Parent taxon: Pycnodonte according to R. L. Squires and R. A. Demetrion 1992
See also Sepkoski 2002 and Squires and Demetrion 1990
Sister taxa: Gryphaea belli, Pycnodonta frauscheri, Pycnodonta rarilamella, Pycnodonta vesicularis, Pycnodonte (Costeina), Pycnodonte (Crenostrea), Pycnodonte (Gigantostrea), Pycnodonte (Phygraea), Pycnodonte (Pycnodonte), Pycnodonte amakusensis, Pycnodonte costei, Pycnodonte erici, Pycnodonte ewekoroensis, Pycnodonte gryphovicinus, Pycnodonte heermanni, Pycnodonte loeli, Pycnodonte nigeriensis, Pycnodonte percrassa, Pycnodonte squarrosa, Pycnodonte trigonalis, Pycnodonte vesicularis
Subtaxa: Pycnodonte (Pegma) bajaensis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Eocene of Mexico (6 collections)
Total: 6 collections each including a single occurrence