Taxonomy
- Kingdom: Animalia
- Phylum: Chordata
- Class: Mammalia
- Order: Rodentia
- Family: Geomyidae
- Genus: Cratogeomys
- Species: Cratogeomys merriami (Rogers, 1932)
- Common names: Michoacan pocket gopher, Merriam's pocket gopher
Description
The Michoacan pocket gopher is a medium‑sized fossorial rodent. Adults have a head‑and‑body length of approximately 120–150 mm and a short tail measuring 20–35 mm. The pelage is generally a uniform brown to reddish‑brown on the dorsal surface, fading to a lighter, sometimes grayish, ventral side. As with other members of Geomyidae, the species possesses large, clawed forelimbs adapted for digging and external cheek pouches (pockets) used for transporting food. The incisors are ever‑growing and project forward, facilitating soil displacement.
Distribution and habitat
Cratogeomys merriami is endemic to Mexico, with a distribution centered in the central‑western states of Michoacán, Guerrero, and adjacent regions of Jalisco. The species occupies a range of montane and sub‑montane habitats, including pine‑oak forests, grassy meadows, and agricultural lands at elevations roughly between 1,500 and 2,800 m above sea level. It prefers soils that are loose enough for extensive burrowing activity.
Behavior and ecology
The Michoacan pocket gopher is a solitary, primarily nocturnal digger. It constructs extensive underground tunnel systems that include nest chambers, food caches, and ventilation shafts. Diet consists mainly of underground plant parts such as roots, tubers, and rhizomes. Reproduction is seasonal; females give birth to litters of 2–5 young after a gestation period of about 30 days. The species plays a notable role in soil aeration and nutrient mixing within its ecosystem.
Conservation status
The International Union for Conservation of Nature (IUCN) currently classifies Cratogeomys merriami as Least Concern. The assessment notes that the species has a relatively wide distribution, presumed large population, and no major widespread threats identified. However, localized habitat alteration due to agriculture and urban expansion may affect some populations.
References
- IUCN Red List of Threatened Species. Cratogeomys merriami: Least Concern.
- Musser, G. G., & Carleton, M. D. (2005). Superfamily Muroidea. In Mammal Species of the World (3rd ed.). Johns Hopkins University Press.
- Reid, R. (2013). “Pocket Gophers (Family Geomyidae).” Mammalian Species, 895, 1‑19.
