What is "acheronodon"

Acheronodon is a genus of herbivorous arboreal mammal which belongs to the family Microcosmodontidae and which was endemic to North America during the Early Paleocene subepoch (66—56.8 mya) and in existence for approximately .

It is a member of the extinct order Multituberculata and lies within the suborder Cimolodonta.

The species Acheronodon garbani is known from fossils found in the Puercan (Paleocene)-age formations of Tullock Formation in Montana (United States) and possible specimens from the Porcupine Hills in Alberta, Canada. The holotype was found in Montana.