Archetypomys is an extinct genus of early Eocene rodent and the only member of the family Archetypomyidae. A single species, Archetypomys erlianensis, has been described from Inner Mongolia. Archetypomys was a very small rodent intermediate in morphology between the basal rodent family Alagomyidae and more advanced rodents (Meng et al., 2007).
- Meng, J., C. Li, X. Ni, Y. Wang, and K.C. Beard. 2007. A new Eocene rodent from the lower Arshanto Formation in the Nuhetingboerhe (Camp Margetts) area, Inner Mongolia. American Museum Novitates, 3569:1-18. 
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