Species: snowii (WILLISTON, 1890) WELLES, 1943
Etymology:
Referred material:
= Alzadasaurus pembertoni WELLES & BUMP, 1949
Etymology:Holotype: Museum of Geology, South Dakota School of Mines and Technology, No. 451
Locality: 25 miles south of Chamberlain and 11 miles northeast of Iona, Missouri River, Lyman County, South Dakota.
Horizon: Sharon Springs Member, Pierre Shale.
Biostratigraphy:
Age: Upper Lower to Lower Middle Campanian Stage, Senonian Subepoch, Upper Gulf Epoch, Late Cretaceous
Material: Skull and nearly complete skeleton.
Note: Paleopathology, humerus shows avascular necrosis (ROTHSCHILDS & STORRS, 2003)