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Myocastor; Temporal range: Late Miocene - Recent
	Nutria (Myocastor coypus)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Placentalia
Order:	Rodentia
Family:	Echimyidae
Subfamily:	Echimyinae
Tribe:	Myocastorini
Genus:	Myocastor; Kerr, 1792
Species
	Myocastor coypus; †Myocastor columnaris; †Myocastor obesus; †Myocastor paranensis;

Myocastor (from Ancient Greek μῦς (mûs) 'rat, mouse', and κάστωρ (kástōr) 'beaver')^[1]^[2] is a genus of rodent that contains the living nutria (or coypu), as well as several fossil species.

Taxonomy

Due to similar cranial morphology, the nutria was once considered a close relative of the Caribbean hutias and placed together with them in the family Capromyidae.^[3] Later, it was more accepted to place it in its own family, the Myocastoridae.^[4] Recent molecular studies place them in the family Echimyidae, in the tribe Myocastorini.^[5]^[6]^[7]

Fossil record

Kerber et al. (2013) recognize the following species as valid:^[8]

Myocastor columnaris (Middle Pleistocene)
Myocastor obesus (Late Miocene)
Myocastor paranensis (Late Miocene)

Other species described but no longer considered valid include Myocastor minor, Myocastor perditus, and Myocastor priscus.

References

^ Bailly, Anatole (1981). Abrégé du dictionnaire grec français. Paris: Hachette. ISBN 978-2-01-003528-9. OCLC 461974285.
^ Bailly, Anatole. "Greek-French dictionary online". www.tabularium.be. Archived from the original on 2022-03-18. Retrieved 2017-01-24.
^ 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. JSTOR 1379762.
^ 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. PMID 15683932.
^ 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. PMID 22327013.
^ Fabre, Pierre-Henri; Upham, Nathan S.; Emmons, Louise H.; Justy, Fabienne; Leite, Yuri L. R.; Loss, Ana Carolina; Orlando, Ludovic; Tilak, Marie-Ka; Patterson, Bruce D.; Douzery, Emmanuel J. P. (2017-03-01). "Mitogenomic Phylogeny, Diversification, and Biogeography of South American Spiny Rats". Molecular Biology and Evolution. 34 (3): 613–633. doi:10.1093/molbev/msw261. ISSN 0737-4038. PMID 28025278.
^ Kerber, L. (2013). "Late Quaternary fossil record of Myocastor Kerr, 1792 (Rodentia: Hystricognathi: Caviomorpha) from Brazil with taxonomical and environmental remarks". Quaternary International: 1–12.

[1] Bailly, Anatole (1981). Abrégé du dictionnaire grec français. Paris: Hachette. ISBN 978-2-01-003528-9. OCLC 461974285.

[2] Bailly, Anatole. "Greek-French dictionary online". www.tabularium.be. Archived from the original on 2022-03-18. Retrieved 2017-01-24.

[3] 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. JSTOR 1379762.

[Woods1982-4] 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.

[Galewski2005-5] 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. PMID 15683932.

[Upham2012-6] 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. PMID 22327013.

[Fabre2017-7] Fabre, Pierre-Henri; Upham, Nathan S.; Emmons, Louise H.; Justy, Fabienne; Leite, Yuri L. R.; Loss, Ana Carolina; Orlando, Ludovic; Tilak, Marie-Ka; Patterson, Bruce D.; Douzery, Emmanuel J. P. (2017-03-01). "Mitogenomic Phylogeny, Diversification, and Biogeography of South American Spiny Rats". Molecular Biology and Evolution. 34 (3): 613–633. doi:10.1093/molbev/msw261. ISSN 0737-4038. PMID 28025278.

[8] Kerber, L. (2013). "Late Quaternary fossil record of Myocastor Kerr, 1792 (Rodentia: Hystricognathi: Caviomorpha) from Brazil with taxonomical and environmental remarks". Quaternary International: 1–12.

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Taxonomy

Fossil record

References

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Myocastor Temporal range: Late Miocene - Recent

Nutria (Myocastor coypus)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Placentalia
Order:	Rodentia
Family:	Echimyidae
Subfamily:	Echimyinae
Tribe:	Myocastorini
Genus:	Myocastor Kerr, 1792
Species
Myocastor coypus †Myocastor columnaris †Myocastor obesus †Myocastor paranensis