760.

Chiapan Climbing Rat

Tylomys bullaris

French: Tylomys de Tuxtla / German: Chiapas-Kletterratte / Spanish: Rata trepadora de Chiapas

Taxonomy. T ylomys bullaris Merriam, 1901, “Tuxtla [Gutiérrez], Chiapas, Mexico.”

Tylomys bullaris is known from less than ten specimens. It may be a subspecies of 1. nudicaudus . Monotypic.

Distribution. SE Mexico, known only in Tuxtla Gutiérrez and surroundings, NW Chiapas.

Descriptive notes. Head-body 166 mm, tail 158 mm; weight 182 g. Measurements and description of the Chiapan Climbing Rat are based on the type specimen, ajuvenile male. Back is dull gray; upperlip, patch next to nose, and belly are white. Ears are large and bare. Hindlegs are brown to toes. Tail is long, naked, and bicolored;first two-thirds are dark and remaining one-third is white. Interparietal is broad, and zygomatic arch is wide. Auditory bullae are markedly inflated and globose at tops.

Habitat. Tropical deciduous forest at elevations of ¢.550 m.

Food and Feeding. No information.

Breeding. No information.

Activity patterns. The Chiapan Climbing Rat is nocturnal and, like other species of Tylomys, probably semi-arboreal.

Movements, Home range and Social organization. Like other species of Tylomys, the Chiapan Climbing Rat is probably solitary.

Status and Conservation. Classified as Critically Endangered on The IUCN Red List. The Chiapan Climbing Rat is only known from the type locality, with a presumed extent of occurrence less than 100 km?®. Its overall and no doubt small population is probably affected by habitat alteration from urbanization and farming.

Bibliography. Alvarez-Castaneda et al. (2015), Espinoza (2002, 2014b), Espinoza & Martinez (2010), Musser & Carleton (2005), Ramirez-Pulido, Gonzalez-Ruiz et al. (2014), Reid (2009), Wilson & Cole (2000).