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. Demetrion 1990

Sister taxa: Gryphaea belli, Pycnodonte (Crenostrea), Pycnodonte (Gigantostrea), Pycnodonte (Phygraea), Pycnodonte (Pycnodonte), Pycnodonte amakusensis, Pycnodonte costei, Pycnodonte heermanni, Pycnodonte percrassa, Pycnodonte squarrosa, Pycnodonte trigonalis, Pycnodonte vesicularis

Subtaxa: Pycnodonte (Pegma) bajaensis

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Type: Pycnodonte (Pegma) bajaensis

Ecology: stationary epifaunal suspension feeder