Thomasomys ladewi, Anthony, 1926

Don E. Wilson, Russell A. Mittermeier & Thomas E. Lacher, Jr, 2017, Cricetidae, Handbook of the Mammals of the World – Volume 7 Rodents II, Barcelona: Lynx Edicions, pp. 204-535 : 502

665.

Ladew’s Oldfield Mouse

Thomasomys ladewi

French: Thomasomys de Ladew / German: Ladew-Paramomaus / Spanish: Ratén de erial de Ladew

Other common names: Ladew’s Thomasomys

Taxonomy. 7 Thomasomys ladewi Anthony, 1926 , “Rio Aceramarca, northeast of La Paz, Bolivia, altitude 10,800 feet [= 3292 ml.” This species is monotypic.

Distribution. Restricted region in La Paz Department, NW Bolivia.

Descriptive notes. Head-body 120-138 mm, tail 158 mm, ear 20-23 mm, hindfoot 28-33 mm; weight 42-64 g. Fur of Ladew’s Oldfield Mouse is soft, lax, and long. Dorsal and ventral pelage is plumbeous butis tipped sooty black, fuscous, and brown on back; cheeks, sides, and lower rump are darker than mid-back; underparts are pale smoke gray to drab gray; pectoral area is darker than rest of underparts; and hands,feet, and tail (above and below) are grayish brown. Mystacial vibrissae are moderately long, extending slightly past posterior margins of pinnae when bent. Hallux is moderately long, with claw not extending more than about one-halfthe length offirst phalanx of second digit. Tail is longer than head-body length (107-132%), with very dispersed hair, and terminates in white tip.

Habitat. Rocky and wooded hillsides in montane forests at elevations of 2360-3300 m.

Food and Feeding. No information.

Breeding. No information.

Activity patterns. No information.

Movements, Home range and Social organization. No information.

Status and Conservation. Classified as Least Concern on The IUCN Red List. Ladew’s Oldfield Mouse is widely distributed, presumably has a large overall population, and is unlikely to be declining enough to be listed in a threatened category.

Bibliography. Anderson (1997), Anthony (1926a), Eisenberg & Redford (1999), Pacheco (2003, 2015b), Pacheco et al. (2009).

Figures

622. Unicolored Oldfield Mouse (Thomasomys monochromos), 623. Venezuelan Oldfield Mouse (Thomasomys emeritus), 624. Dressy Oldfield Mouse (Thomasomys vestitus), 625. Woodland Oldfield Mouse (Thomasomys hylophilus), 626. Niceforo Maria’s Oldfield Mouse (Thomasomys nicefor), 627. Popayan Oldfield Mouse (Thomasomys popayanus), 628. Shortfaced Oldfield Mouse (Thomasomys baeops), 629. Snow-footed Oldfield Mouse (Thomasomys niveipes), 630. Principal Oldfield Mouse (Thomasomys princeps), 631. Silky Oldfield Mouse (Thomasomys bombycinus), 632. Red Andean Oldfield Mouse (Thomasomys auricularis), 633. Cinnamon-colored Oldfield Mouse (Thomasomys cinnameus), 634. Central Andes Oldfield Mouse (Thomasomys contradictus), 635. Ashy-bellied Oldfield Mouse (Thomasomys cinererventer), 636. Colombian Oldfield Mouse (Thomasomys dispar), 637. Soft-furred Oldfield Mouse (Thomasomys laniger), 638. Ash-colored Oldfield Mouse (Thomasomys cinereus), 639. Wandering Oldfield Mouse (Thomasomys erro), 640. Paramo Oldfield Mouse (Thomasomys paramorum), 641. Forest Oldfield Mouse (Thomasomys silvestris), 642. Smoky Oldfield Mouse (Thomasomys fumeus), 643. Pichincha Oldfield Mouse (Thomasomys vulcani), 644. Ucucha Oldfield Mouse (Thomasomys ucucha), 645. Taczanowski’s Oldfield Mouse (Thomasomys taczanowsku), 646. Golden Oldfield Mouse (Thomasomys aureus), 647. White-tipped Oldfield Mouse (Thomasomys caudivarius), 648. Hudson's Oldfield Mouse (Thomasomys hudsoni), 649. Reddish-backed Oldfield Mouse (Thomasomys pyrrhonotus), 650. Montane Oldfield Mouse (Thomasomys oreas), 651. Cajamarca Oldfield Mouse (Thomasomys praetor), 652. Distinguished Oldfield Mouse (Thomasomys notatus), 653. Apeco Oldfield Mouse (Thomasomys apeco), 654. Peruvian Oldfield Mouse (Thomasomys eleusis), 655. Strong-tailed Oldfield Mouse (Thomasomys ischyrus), 656. Reddish-nosed Oldfield Mouse (Thomasomys rosalinda), 657. Large-eared Oldfield Mouse (Thomasomys macrotis), 658. Ashaninka Oldfield Mouse (Thomasomys onkiro), 659. Inca Oldfield Mouse (Thomasomys incanus), 660. Kalinowski’s Oldfield Mouse (Thomasomys kalinowskii), 661. Slender Oldfield Mouse (Thomasomys gracilis), 662. Daphne’s Oldfield Mouse (Thomasomys daphne), 663. Anderson’s Oldfield Mouse (Thomasomys andersoni), 664. Austral Oldfield Mouse (Thomasomys australis), 665. Ladew’s Oldfield Mouse (Thomasomys ladewi)

Distribution. Restricted region in La Paz Department, NW Bolivia.