What is "bryceomys"

Bryceomys is an extinct mammal that lived during the late Cretaceous period (between 100 and 66 million years ago) and thus shared the world with dinosaurs. It was a member of the also extinct order of Multituberculata. It was within the suborder of Cimolodonta, and a member of the Paracimexomys group.

The genus Bryceomys ("Bryce mouse", after Bryce Canyon National Park) was named by Eaton J.G. in 1995.