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.