Genus: Dolichorhynchops WILLISON, 1903
Etymology: Greek, dolikhos, “long”, Greek, rhygkhos, “snout, beak”, Greek, ops, “face”: Long beak face.

Species: osborni WILLISTON, 1903
Etymology:
= Polycotylus osborni (WILLISTON, 1903) WATSON, 1951?
= Trinacromerium osborni (WILLISTON, 1903) KUHN, 1934

Holotype: KUVP 1300

Locality: Unknown, east of Wallace, Logan County, Kansas.

Horizon: Smoky Hill Member, Niobrara Formation.

Biostratigraphy: Hesperornis zone.

Age: Santonian or Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Skull and incomplete skeleton.
Note: Gastroliths were found (WILLISTON, 1893, WHITTLE & EVERHART, 2000)