Mammalia - Multituberculata - Eucosmodontidae
Parent taxon: Cimolodonta according to Z. Kielan-Jaworowska and J. H. Hurum 2001
See also Clemens and Kielan-Jaworowska 1979, Kielan-Jaworowska 1969, Kielan-Jaworowska 1974, Kielan-Jaworowska 1980, Kielan-Jaworowska et al. 2004, Lofgren et al. 2005, McKenna and Bell 1997 and Sloan and Van Valen 1965
Sister taxa: Boffiidae, Bryceomys, Cedaromys, Cimexomys, Cimolomyidae, Corriebaataridae, Dakotamys, Djadochtatherioidea, Kogaionidae, Microcosmodontidae, Paracimexomys, Ptilodontoidea, Taeniolabidoidea, Uzbekbaatar, Viridomys, Yubaatar
Subtaxa: Clemensodon Eucosmodon Eucosmodontinae
Type: Eucosmodon
Ecology: arboreal omnivore
Distribution:
• Eocene of United States (37: Colorado, Wyoming collections)
• Cf2 of United States (1: Wyoming)
• Paleocene of Canada (10: Alberta, Saskatchewan), United States (62: Montana, New Mexico, Texas, Utah, Wyoming)
• Cretaceous of Mexico (1), Mongolia (1), United States (5: New Mexico, Wyoming)
Total: 117 collections including 137 occurrences