Catopsalis

Catopsalis is a possibly invalid genus of extinct mammal from the Paleocene of North America. This animal was a relatively large member of the extinct order of Multituberculata. Most Multituberculates were much smaller.

At one time, the genus was also formally reported from the upper Cretaceous of Mongolia. However, that material was subsequently referred to the genera of Djadochtatherium and Catopsbaatar. Catopsalis is within the suborder of Cimolodonta and a member of the superfamily Taeniolabidoidea.

Recent research suggests that "Catopsalis" is actually a paraphyletic assemblage, and one species, C. joyneri, has been moved to its own genus, Valenopsalis.

The species Catopsalis alexanderi was named by Middleton M.D. in 1982. It is found in the Puercan (Paleocene)-age Littleton Local Fauna of Colorado, Montana and Wyoming (United States), dating from 66 - 63 million years ago. Specimens are included in the collections of the American Museum of Natural History in New York and the Peabody Museum of Natural History at Yale University. This species was a relative heavyweight among multituberculates.

The species Catopsalis calgariensis was named by Russell L.S. in 1926. Remains were found in Paleocene-age strata of Wyoming and Alberta, Canada. The holotype, collected in 1924, is in the collection of Alberta University. Further material is in the possession of Wyoming University. This species was a large heavyweight.