Synonyms: Hystrichomorpha, Hystricomorpha
Parent taxon: Rodentia according to C. Montgelard et al. 2002
See also Ameghino 1894, Ameghino 1897, Carroll 1988, Coster et al. 2010, Gadow 1898, Hay 1902, Huchon et al. 2007, Nowak 1999, Paula Couto 1956, Sostillo et al. 2014 and Wilson and Reeder 2005
Sister taxa: Alagomyidae, Allactagidae, Allomyidae, Anomalomyidae, Anomaluroidea, Aplodontoidea, Archetypomyidae, Callodontomys, Castorimorpha, Cavina, Cercolabidae, Conilurus, Cricetidae, Cylindrodontidae, Dolosimus, Downsimys, Echinomyidae, Ectropomys, Entoptychidae, Epeiromys, Eryomyidae, Eryomyina, Florentiamyidae, Gliroidea, Homocentrus, Hystricognatha, Ischyromyidae, Ischyromyiformes, Ivanantonia, Megacricetodontidae, Muriformia, Mylagaulidae, Myodonta, Myomorpha, Pairomys, Paramyidae, Petauristidae, Pipestoneomyidae, Protrogomorpha, Pseudomys, Quercymys, Remyidae, Sciurognathi, Sciuroidea, Sciuromorpha, Siphneidae, Taeniodus, Theridomyoidea, Yuomyidae, Zamoramys, Zelomyidae
Subtaxa: Coendidae Ctenodactyloidea Hystricognathi Paradoxomyidae Pseudoneoreomys Thryonomyoidea Viscacidae
Ecology: ground dwelling herbivore