Due to similar cranial morphology, the nutria was once considered a close relative of the Caribbeanhutias and placed together with them in the familyCapromyidae.[1] Later, it was more accepted to place it in its own family, the Myocastoridae.[2] Recent molecular studies place them in the familyEchimyidae, in the tribeMyocastorini.[3][4][5]
^Woods, C.A.; Howland, E.B. (1979). "Adaptive Radiation of Capromyid Rodents: Anatomy of the Masticatory Apparatus".Journal of Mammalogy.60 (1):95–116.doi:10.2307/1379762.JSTOR1379762.
^Woods, C. A. (1982). "The history and classification of South American Hystricognath rodents: reflections on the far away and long ago". In Mares, M. A.; Genoways, H. H. (eds.).Mammalian Biology in South America. Pittsburgh: University of Pittsburgh. pp. 377–392.
^Galewski, Thomas; Mauffrey, Jean-François; Leite, Yuri L. R.; Patton, James L.; Douzery, Emmanuel J. P. (2005). "Ecomorphological diversification among South American spiny rats (Rodentia; Echimyidae): a phylogenetic and chronological approach".Molecular Phylogenetics and Evolution.34 (3):601–615.Bibcode:2005MolPE..34..601G.doi:10.1016/j.ympev.2004.11.015.PMID15683932.
^Upham, Nathan S.; Patterson, Bruce D. (2012). "Diversification and biogeography of the Neotropical caviomorph lineage Octodontoidea (Rodentia: Hystricognathi)".Molecular Phylogenetics and Evolution.63 (2):417–429.Bibcode:2012MolPE..63..417U.doi:10.1016/j.ympev.2012.01.020.PMID22327013.
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