Classification
The Mexican deer mouse belongs to the mexicanus species group within the genus Peromyscus. Genetic analysis has shown that its closest relatives are the Yucatan, Guatemalan, Chiapan, and naked-eared deer mice. Indeed, these were so similar genetically that the Mexican deermouse may be paraphyletic with respect to some or all of the other named species.
Seven sub-species of Mexican deer mouse are currently recognised:
- P. m. mexicanus - Veracruz
- P. m. angelensis - Oaxaca coastal lowlands
- P. m. azulensis - Juchitán highlands, Oaxaca
- P. m. putlaensis - Putla District, Oaxaca
- P. m. saxatilis - Central America
- P. m. teapensis - Tabasco
- P. m. totontepecus - Sierra Norte de Oaxaca
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