Species: latipinnis COPE, 1869
Etymology:
Referred material:
MARTIN, SCHUMACHER PARRIS & GRANDSTAFF, 1998
Locality: SDSM V9011, South Dakota.
Horizon: 1 meter below the Niobrara/Pierre contact.
Biostratigraphy:
Age: Late Cretaceous.
Material:
SDSM 23020: Nearly complete articulated skeleton.
Note: Paleopathology, humerus shows avascular necrosis (ROTHSCHILDS & STORRS, 2003)