Holotype

Welles, Samuel P. (1943) Elasmosaurid Plesiosaurs with description of new material from California and Colorado; Memoirs of the University of California, 13(3), pp.125-254.

Refered Specimen

Everhart, Michael J. (2006) The occurrence of elasmosaurids (Reptilia: Plesiosauria) in the Niobrara Chalk of Western Kansas; Paludicila, 5(4), pp.170-183