| Name | Age | Stage | Formation | Member | Comment |
|---|---|---|---|---|---|
| Pycnodonte (Pycnodonte) mutabilis Morton,1828 | Cretaceous | Lower Maestrichtian | Demopolis | - | found with Exogyra cancellata |
| Pycnodonte panda
Morton, 1833 | Cretaceous | - | Eutaw | Tombigbee Sand | no photo yet |
| Pycnodonte (Phygraea) convexa
Say, 1820 | Cretaceous | Campanian | Mooreville | Lower | - |
| Pycnodonte (Phygraea) aucella
Roemer, 1849 | Cretaceous | Middle Santonian | Austin Chalk | - | formation type locality |
| Pycnodonte wratheri | Cretaceous | Santonian | L. Austin Chalk, Mooreville | - | no photo yet |
| Pycnodonte newberryi | Cretaceous | Turonian | Dakota Sandstone | Gryphaea | Found 3m above E. olisoponensis conglomerate |
| Pycnodonte kansasense | Cretaceous | L Turonian | Greenhorn | not yet collected | |
| Pycnodonte wardii | Cretaceous | Lower Albian | Glen Rose | lower | - |
