Bivalvia - Ostreida - Gryphaeidae
Parent taxon: Pycnodonte according to E. J. Moore 1987
See also Woodring 1982
Sister taxa: Gryphaea belli, Pycnodonta frauscheri, Pycnodonta rarilamella, Pycnodonta vesicularis, Pycnodonte (Costeina), Pycnodonte (Crenostrea), Pycnodonte (Gigantostrea), Pycnodonte (Pegma), Pycnodonte (Phygraea), 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 (Pycnodonte) callifera Pycnodonte (Pycnodonte) gryphina Pycnodonte (Pycnodonte) howelli Pycnodonte (Pycnodonte) radiata Pycnodonte (Pycnodonte) wiedeyi Pycnodonte (Pycnodonte) ynezana
Type: Pycnodonte radiata
Ecology: stationary epifaunal suspension feeder
Distribution:
• Miocene of Panama (1 collection), United States (2: California)
• Oligocene of Bulgaria (8), Denmark (3), France (1), Germany (1)
• Eocene of Bulgaria (2), the Netherlands (2), Senegal (1), the United Kingdom (1)
• Cretaceous of United States (9: California)
Total: 31 collections including 32 occurrences