Arctodontomys simplicidens (extinct)
Variant names:
 Microsyops simplicidens

Latitudinal range: 41.5° to 41.8°
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Found in two samples

United States: Big Multi Quarry (Late Palaeocene), Mark's Locality (Late Palaeocene)

See also Arctodontomys, Arctodontomys sp., Arctodontomys wilsoni