Full reference: O. C. Marsh. 1875. Notice of new Tertiary mammals, IV. American Journal of Science, series 3 9(51):239-250
Parent taxon: Cimolesta according to M. C. McKenna and S. K. Bell 1997
See also Carroll 1988, Cope 1875, Flower and Lydekker 1891, Gadow 1898, Hay 1902, Jaekel 1911, Marsh 1875 and McKenna 1975
Sister taxa: Apatotheria, Cimolestidae, Didelphodonta, Ernanodonta, Palaeoryctida, Pantodonta, Pantolesta, Pentacodontidae, Sarcodontidae, Todralestidae
Subtaxa: Azygonyx Basalina Benaius Dysnoetodon Esthonychidae Kuanchuanius Lofochaius Meiostylodon Plethorodon Simplodon Yuesthonychidae
Distribution:
• Eocene of Canada (1: British Columbia collection), China (8), France (9), India (3), Japan (3), Mexico (1), Pakistan (2), the United Kingdom (1), United States (332: California, Colorado, New Jersey, New Mexico, Utah, Virginia, Wyoming)
• Clarkforkian of United States (48: Colorado, Wyoming)
• Paleocene of China (8), United States (1: Wyoming)
Total: 417 collections including 448 occurrences