Mammalia - Rodentia - Florentiamyidae
Parent taxon: Rodentia according to W. W. Korth et al. 2022
See also Carroll 1988
Sister taxa: Alagomyidae, Allactagidae, Allomyidae, Anomalomyidae, Anomaluroidea, Aplodontoidea, Archetypomyidae, Callodontomys, Castorimorpha, Cavina, Cercolabidae, Conilurus, Cricetidae, Ctenohystrica, Cylindrodontidae, Dolosimus, Downsimys, Echinomyidae, Ectropomys, Entoptychidae, Epeiromys, Eryomyidae, Eryomyina, Gliroidea, Homocentrus, Hystricognatha, Ischyromyidae, Ischyromyiformes, Ivanantonia, Megacricetodontidae, Muriformia, Mylagaulidae, Myodonta, Myomorpha, Pairomys, Paramyidae, Petauristidae, Pipestoneomyidae, Protrogomorpha, Pseudomys, Quercymys, Remyidae, Sciurognathi, Sciuroidea, Sciuromorpha, Siphneidae, Taeniodus, Theridomyoidea, Yuomyidae, Zamoramys, Zelomyidae
Subtaxa: Ecclesimus Fanimus Florentiamys Hitonkala Kirkomys Sanctimus
Ecology: ground dwelling herbivore
Distribution:
• Miocene of United States (5: Nebraska, South Dakota collections)
• Harrisonian of United States (6: Nebraska)
• Arikareean of United States (15: California, Florida, Nebraska, Oregon, South Dakota, Wyoming)
• Oligocene of Canada (2: Saskatchewan), United States (26: Colorado, Nebraska, Oregon, South Dakota)
• Eocene to Oligocene of United States (1: Nebraska)
Total: 55 collections including 71 occurrences