Greenbaum's Deermouse is another species that came to light in 2022 during a detailed review of the Peromyscus boylii complex in the mountains of western Mexico. Populations around Dos Aguas and Aguililla, in western Michoacán, were found to have genetics and a karyotype distinct enough from their relatives to justify species status. The name honours Ira Greenbaum, a specialist in the cytogenetics of North American rodents.
Greenbaum's Deermouse is a medium-sized mouse, with the brown colouring and long bicoloured tail typical of the Peromyscus boylii complex. No published external features reliably distinguish it from its closest relatives without genetic or chromosomal data.
No published descriptions of its tracks or droppings exist to distinguish Greenbaum's Deermouse in the field from other Peromyscus boylii complex species. It shares mountain habitat with these species in western Michoacán.
Greenbaum's Deermouse lives in mountain forest in the west of Michoacán state, around Dos Aguas and Aguililla, in west-central Mexico.
Not evaluated by the IUCN.
Described in 2022 and with a very restricted distribution, no published information exists on population trends.
Deforestation of mountain forest for agriculture and timber production in western Michoacán is the most probable general pressure on its restricted habitat.
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