A rodent of the Mesoamerican highlands, the Highland Rice Rat is a very close relative of other Mexican cloud-forest rice rats from which it was only clearly distinguished following recent molecular phylogenetic studies. It lives at some of the highest elevations occupied by any rodent of its group in the region, with populations documented above 3,000 metres. It inhabits the humid understorey of mountain forest in an area split between southern Mexico and Guatemala—a habitat type whose naturally fragmented distribution across separate mountain ranges promotes the emergence of species with very restricted ranges like this one. Its already delicate conservation status is aggravated by how little is still known about its basic biology.
A small rodent with dark brown fur displaying a somewhat more striped or streaked pattern than other related species in its group, a compact body and a moderately long tail. It is easily confused with other species from the same Mesoamerican cloud-forest rodent complex, which require genetic analysis for reliable identification; its presence at higher altitudes than sister species helps guide identification without guaranteeing it entirely.
Small tracks and signs: track 1.5-2 cm long, with 4 front toes and 5 hind toes. Small, elongated droppings 4-6 mm long, left scattered along paths through dense vegetation on the mountain forest floor. It builds nests and shelters in hollows beneath fallen logs, roots, or moss-covered rock crevices in the humid understorey typical of the high-elevation cloud forest where it lives.
Cloud forest and mountain forest with a dense, humid understorey, generally between 1,250 and 3,250 m elevation—one of the highest ranges occupied by any rodent of its group in the region. Distributed across mountainous areas of Guatemala and southern Mexico, in an area fragmented across different ranges.
Omnivorous, feeding on seeds, fruit, fungi, and invertebrates from the mountain forest floor.
Terrestrial and probably nocturnal, it lives hidden among the dense vegetation of the mountain forest floor. As it is a species only resolved taxonomically relatively recently, many details of its social and reproductive behaviour are still being documented.
Its populations are considered to be in marked decline due to the ongoing loss of the mountain forest on which it depends. Its conservation situation is more critical than that of other related species from lower elevations, given the greater fragmentation of its high-altitude habitat.
Deforestation and fragmentation of mountain forest caused by agricultural and livestock expansion, alongside the altitudinal shift of the humidity conditions necessary for this ecosystem due to climate change—a risk particularly relevant for a species already confined to the highest elevations of its group.
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