Species: latipinnis COPE, 1869
Etymology:
Holotype: USNM 27678
Locality: 8 km east of Fort Wallace, on the Smokey Hill River, Logan County, Kansas.
Horizon: Smoky Hill Member, Niobrara Formation.
Biostratigraphy: Hesperornis zone.
Age: Santonian or Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.
Material: Fragmentary skull and fragmentary skeleton.
Note: Gastroliths were found (WILLISTON, 1893, WHITTLE & EVERHART, 2000)