Genus: Claosaurus non MARSH, 1890

Species: affinis WIELAND, 1903 (nomen dubium)
Etymology: Latin, ad +‎ finis, “boundary."
= Trachodon (“Claosaurus) affinis (WIELAND, 1903) KUHN, 1936 (nomen dubium)

Holotype: YPM 3219

Locality: West side of Cheyenne River, nearly opposite Corral Draw, near Red Shirt, Custer County, South Dakota.

Horizon: Pierre Formation.


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

Material: Proximal phalanx digits, II, IV and third phalanx digit IV.