Genus: Pugiopsephurus HILTON, DURING, GRANDE & AHLBERG, 2023
Etymology: Latin, pugio, "dagger" and Greek, psephurus, a recently extinct genus of Polyodontidae with similarly short gill rakers.
Species: inundatus HILTON, DURING, GRANDE & AHLBERG, 2023
Etymology: Latin, adjective, meaning flooded, in reference to the seiche wave that has been implicated in the mass burial of fishes at the Tanis site.
Holotype: DMNH EPV.138508
Locality: Tanis Site, Bowman County, North Dakota.
Horizon: Hell Creek Formaton.
Biostratigraphy:
Age: Lancian age, Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Portions of the skull, rostrum, pectoral girdle, and fin and anterior portion of body exposed in ventral view.