well understood. In the late 20th century, it was generally agreed that Eurymylus, which lived in eastern Asia and dates back to the late Paleocene or early...

rodents) arose. However, the more completely known eurymylids, including Eurymylus, Heomys, Matutinia, and Rhombomylus, appear to represent a monophyletic...

has been considered primitive. Some early representatives, including Eurymylus, lack HSB, but others, including Matutinia and some mimotonids, have double-layered...