Mammalia - Rodentia - Aplodontidae

Full reference: W. W. Korth, C. A. Boyd, J. J. Person and D. Anderson. 2022. Fossil mammals from ant mounds situated on exposures of the Big Cottonwood Creek Member of the Chadron Formation (latest Eocene - Early Oligocene), Sioux County, Nebraska. Paludicola 13(4):191-344

Parent taxon: Prosciurinae according to W. W. Korth et al. 2022

Sister taxa: Campestrallomys, Ephemeromys, Oropyctis, Pelycomys, Pseudallomys

Subtaxa: Costepeiromys attasorus

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Type: Costepeiromys attasorus

Ecology: fossorial herbivore

Distribution: found only at Arner Ranch ant mounds (Eocene to Oligocene of Nebraska)

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Specimen images are retrieved through the ePANDDA API.