652.

Distinguished Oldfield Mouse

Thomasomys notatus

French: Thomasomys a pattes sombres / German: Edle Paramomaus / Spanish: Raton de erial distinguido

Other common names: Dusky-footed Thomasomys

Taxonomy. Thomasomys notatus Thomas, 1917, Torontoy, Cusco, Peru.

This species is monotypic.

Distribution. E slopes of the C Andes of Peru.

Descriptive notes. Head-body 110-128 mm, tail 105-130 mm, ear 18-23 mm, hindfoot 24-27 mm. No specific data are available for body weight. Fur of the Distinguished Oldfield Mouseis thick and rather woolly. Dorsal fur is comparatively short (average 6-9 mm) and ocherous tawny, with perceptible dorsal stripe present, grayer on head, and tawnier posteriorly. Venter is soiled whitish. Fur above hindfeet has dark brown metatarsal patch, and sides and digits are whitish. Eye-ring is present and dark. Lips and throat are white and contrast sharply with dorsal color. Ears are blackish, contrasting with head and whitish post-auricular patch. Mystacial vibrissae are long, extending backward distinctly beyond pinnae when bent. Tail is long, blackish brown, and unicolored or incipiently bicolored; its ventral side is indistinctly paler on proximal one-quarter and short-haired, with small tuft of long hair at tip. Hindfoot is moderately broad, without gap between thenar and hypothenar pads and with long hallux, extending to interphalangeal joint of second digit. Protuberance of anusis raised.

Habitat. Mainly montane forests at elevations of 1400-3400 m.

Food and Feeding. The Distinguished Oldfield Mouse eats several species of Cyperaceae and Poaceae (89-2%) and arthropods (less than 5%).

Breeding. No information.

Activity patterns. No information.

Movements, Home range and Social organization. Apparently the Distinguished Oldfield Mouse is not abundant in montane forests of Cusco.

Status and Conservation. Classified as Least Concern on The IUCN Red List. The Distinguished Oldfield Mouse is widely distribution in 182,420 km? and presumably has a large overall population. It occurs in several protected areas and probably is tolerant of some degree of habitat modification. The Distinguished Oldfield Mouse is currently considered endemic to the Peruvian Andes but could be present in Yungas habitats of Ecuador and Bolivia.

Bibliography. Cassola (2016s), Eisenberg & Redford (1999), Emmons et al. (2001), Gardner (1976), Gardner & Patton (1976), Leo & Romo (1992), Medina et al. (2012), Noblecilla & Pacheco (2012), Pacheco (2003, 2015b), Pacheco et al. (2009), Patton (1986), Quintana (2011), SalazarBravo & Yates (2007), Thomas (1917d, 1920d, 1926¢), Vivar (2006).