Species: copei (WIELAND, 1909) HOOKS, 1998
Etymology: In honor of E. D. Cope.
= Protostega copei WIELAND, 1909
= Archelon copei (WIELAND, 1909) ZANGERL, 1953

Holotype: YPM 1787

Locality: Hackberry Creek Valley, Gove County, Kansas.

Horizon: Niobrara Formation.

Biostratigraphy:

Age: Late Cretaceous.

Material: Nearly complete specimen.

Referred material:

USNM 11649: Fragmentary shell and skeleton.