†subfamily Protopsephurinae Grande and Bemis 1996 (paddlefish)
Osteichthyes - Acipenseriformes - Polyodontidae
Full reference: L. Grande and W. E. Bemis. 1996. Interrelationships of Acipenseriformes, with comments on "Chondrostei". In: M. L. J. Stiassny, L. R. Parenti & G. D. Johnson (eds.), Interrelationships of Fishes. Academic Press, San Diego 85-115
Parent taxon: Polyodontidae according to J. S. Nelson et al. 2016
See also Grande and Bemis 1996 and Grande et al. 2002
Sister taxa: Hesperopsephurus, Pholidurus, Psephuroides
Subtaxa: Polyodonti Protopsephurus
Ecology: nektobenthic carnivore
Distribution:
• Paleocene of United States (1: Montana collection)
• Cretaceous of China (3), United States (5: Montana, New Mexico, Wyoming)
Total: 9 collections each including a single occurrence