Acheronodon

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

Genus: Acheronodon Archibald JD, 1982

Species: Acheronodon garbani Archibald JD, 1982
Place: Tullock Formation, Montana & ?Porcupine Hills, Alberta
Country: USA & ?Canada
Age: Puercan, Paleocene
Remarks: The holotype[?] was found in Montana.
Reference: Archibald (1982), A study of Mammalia and geology across the Cretaceous-Tertiary boundary in Garfield County, Montana. Univ. Calif. Publ. Geol. Sci. 122, p.1-286.

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/taenio.htm) MESOZOIC MAMMALS; Eucosmodontidae, Microcosmodontidae and Taeniolabidoidea, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)