663.

Anderson’s Oldfield Mouse

Thomasomys andersoni

French: Thomasomys d/Anderson / German: Anderson-Paramomaus / Spanish: Raton de erial de Anderson

Other common names: Anderson's Thomasomys

Taxonomy. Thomasomys andersoni Salazar-Bravo & Yates, 2007, Corani hydroelectric plant, Cochabamba, Bolivia.

This species is monotypic.

Distribution. E Andean slopes in WC Bolivia (La Paz and Cochabamba departments).

Descriptive notes. Head-body 108-110 mm, tail 122-128 mm, ear 20-21 mm, hindfoot 22-26 mm; weight 35-38 g. Fur of Anderson’s Oldfield Mouse is soft, dense, and comparatively long (average 11 mm). Dorsum is dull brownish olive; venter is olive buff, with yellowish tinge and distinct yellow pectoral markings. Ears are comparatively large and blackish brown. Mystacial vibrissae are moderately long, extending slightly beyond posterior margin of pinnae when bent. Tail is slightly longer than head-body length (113-116%), with short terminal pencil 8-10 mm long. Hindfootis relatively short and broad, with dorsal chocolate-brown metatarsal patch that contrasts with white digits. Hallux is relatively short. Chromosomal complement is 2n = 44 and FN = 42.

Habitat. Upper montane rainforest.

Food and Feeding. No information.

Breeding. No information.

Activity patterns. Anderson’s Oldfield Mouse is probably arboreal; specimens in type series were recorded at ¢.2 m aboveground in a short tree at the bottom of a small ravine.

Movements, Home range and Social organization. No information.

Status and Conservation. Not assessed on The IUCN Red Lust.

Bibliography. Pacheco (2003, 2015b), SalazarBravo & Yates (2007), Voss et al. (2001).