Reptilia - Testudines - Pantrionychidae
Full reference: S. E. Jasinski, A. B. Heckert, C. Sailar, A. J. Lichtig, S. G. Lucas and P. Dodson. 2022. A softshell turtle (Testudines: Trionychidae: Plastomeninae) from the uppermost Cretaceous (Maastrichtian) Hell Creek Formation, North Dakota, USA, with implications for the evolutionary relationships of plastomenines and other trionychids. Cretaceous Research 135:105172
Parent taxon: Plastomenidae according to S. E. Jasinski et al. 2022
Sister taxa: Aspideretoides, Atoposemys, Gilmoremys, Jimemys
Subtaxa: Helopanoplia Hutchemys Plastomenus
Ecology: aquatic omnivore
Distribution:
• Eocene of United States (12: North Dakota, Utah, Wyoming collections)
• Clarkforkian of United States (5: Montana, Wyoming)
• Paleocene of United States (31: Colorado, Montana, New Mexico, Utah, Wyoming)
• Cretaceous of United States (73: Arizona, Colorado, Montana, North Dakota, South Dakota, Texas, Utah, Wyoming)
Total: 121 collections including 126 occurrences