| Name | Age | Stage | Formation | Member | Comment |
|---|---|---|---|---|---|
| Gryphaea (Gryphaea) planoconvexa fratera | Jurassic | Bajocian | Twin Creek | Sliderock | Utah no photo yet |
| Gryphaea (Gryphaea) nebrascensis | Jurassic | Bajocian | Twin Creek | - | Wyoming no photo yet |
| Gryphaea (Gryphaea) nevadensis | Triassic | Karnic | Luning | - | Nevada no photo yet |
| Gryphaea (Gryphaea) culebra | Jurassic | - | Unnamed | - | Idaho - not yet collected |