NotoparamysNotoparamys is an extinct genus of paramyine rodent that lived in North America during the Wasatchian.DescriptionNotoparamys possessed a midbrain partially exposed between the cerebellum and cerebrum but lacked visible rostral colliculi. The incisor enamel of Notoparamys costilloi was pauciserial. The mandibular fourth premolar of N. costilloi had a pattern of Hunter-Schreger bands known as an S-type schmelzmuster. Occlusion in N. costilloi was characterised by mesiolingual movement of the mandibular molars across the maxillary ones in a similar fashion to the closely related Paramys.