Cranial foramina and relationships of Eutypomys (Rodentia, Eutypomyidae). American Museum novitates ; no. 2626

Abstract

"Derived characters of the sphenopalatine, interorbital, and dorsal palatine foramina are shared by the Eutypomyidae and Castoridae. These support the hypothesis that the two families had common ancestry in a stem species from which no other rodent groups are descended. The two families may be included in a monophyletic superfamily, Catoroidea"--P. [1].