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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Ordo: Therapsida
Cladus: Theriodontia
Subordo: Cynodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohort: Theria
Cohort: Eutheria
Cohort: Placentalia
Cladus: Boreoeutheria
Superordo: Euarchontoglires
Ordo: Rodentia
Subordo: Myomorpha
Superfamilia: Muroidea

Familia: Cricetidae
Subfamilia: Neotominae
Tribus: Reithrodontomyini
Genus: Isthmomys
Species (2): I. flavidus – I. pirrensis

Isthmomys Hooper & Musser, 1964: 12

Type species: Megadontomys flavidus Bangs, 1902, by original designation.
Primary references

Hooper, E.T. & Musser, G.G. 1964. Notes on classification of the rodent genus Peromyscus. Occasional Papers Museum of Zoology, University of Michigan 635: 1–13. handle Reference page.


Isthmomys in Mammal Species of the World.
Wilson, Don E. & Reeder, DeeAnn M. (Editors) 2005. Mammal Species of the World – A Taxonomic and Geographic Reference. Third edition. ISBN 0-8018-8221-4.

Isthmomys is a genus of rodent in the family Cricetidae, belonging to the tribe Reithrodontomyini. Species are:

Yellow isthmus rat (Isthmomys flavidus)
Mount Pirri isthmus rat (Isthmomys pirrensis)


Anthony, H. E. 1916. Panama Mammals Collected in 1914–1915. Bulletin of the American Museum of Natural History 35: 357–377.
Bangs, Outram. 1902. Chiriqui Mammalia: Megadontomys flavidus. Bulletin of the Museum of Comparative Zoology at Harvard College 8: 27–29.
Carleton, M. D. 1980. Phylogenetic relationships in neotomine-peromyscine rodents (Muroidea) and a reappraisal of the dichotomy within New World Cricetinae.
Cuartas-Calle, Carlos Auturo and Javier Muñoz-Arango. 2003. Lista de los Mamiferos (Mammalia: Theria) del departamento de Antioquia, Colombia. Biota Colombiana 4, no. 1: 65–78.
Goldman, Edward. 1912. New Mammals from Eastern Panama. Smithsonian Miscellaneous Collections 60, no. 2: 1–18.
Goldman, Edward. 1920. Mammals of Panama. Smithsonian Miscellaneous Collections 69, no. 5.
Goodwin, George G. 1946. Mammals of Costa Rica. Bulletin of the American Museum of Natural History 87, no. 5.
Hall, E.R. and K.R. Kelson. 1958 The Mammals of North America. New York: Ronald Press Co.
Handley, Charles. 1966. Checklist of the Mammals of Panama. In Ectoparasites of Panama, ed. Wenzel and Tipton:753–796. Chicago, Illinois: Field Museum of Natural History.
Hooper, Emmet T. and Guy Musser. 1964. Notes on the classification of the rodent genus Peromyscus. Occasional Papers of the Museum of Zoology, University of Michigan, no. 635.
Linzey, Alicia and James N. Layne. 1974. Comparative morphology of spermatozoa of the rodent genus Peromyscus (Muridae). American Museum Novitates, no. 2532.
Linzey, Alicia and James N. Layne. 1969. Comparative morphology of the male reproductive tract in the rodent genus Peromyscus (Muridae). American Museum Novitates, no. 2355: 1–46.
Middleton, John R. 2007. A Systematic Revision of Genus Isthmomys (Rodentia: Cricetidae). Master's Thesis, Texas Tech University, Lubbock Texas.
Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore.
Stangl, F. B. and R. J. Baker. 1984. Evolutionary relationships in Peromyscus: congruence in chromosomal, genic, and classical data sets. Journal of Mammalogy 65, no. 4: 643–654.

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