Found in 4 samples

United States: Thomas Farm (Unit 15) (Early Miocene), Thomas Farm (Unit 11) (Early Miocene), Thomas Farm (Unit 6-7) (Early Miocene), Thomas Farm (Unit 5) (Early Miocene)

See also Proheteromys, Proheteromys latidens, Proheteromys sp., Proheteromys sulculus, Proheteromys thorpei