Xanclomys

Xanclomys is a small mammal from the Paleocene of North America. It was a genus within the extinct order of Multituberculata.
For those of a technical inclination, it's within the Suborder of Cimolodonta, family Neoplagiaulacidae.

Genus: Xanclomys Rigby JK, 1980
Aka: Xancolomys

Species: Xanclomys mcgrewi Rigby JK, 1980
Place: Swain Quarry, Wyoming
Country: USA
Age: Torrejonian, Paleocene
Remarks: Affinities are uncertain. There's perhaps a second, unnamed species scurrying around somewhere.
Reference: Rigby (1980), Swain Quarry of the Fort Union Formation, Middle Paleocene (Torrejonian), Carbon County, Wyoming: geologic setting and mammalian fauna. Evolutionary Monographs, 3, vi+179pp.

Page reference: Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.

(This information has been derived from [1] (http://home.arcor.de/ktdykes/ptilodon.htm) MESOZOIC MAMMALS; Ptilodontoidea, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)