Thomasomys silvestris, Anthony, 1924

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 : 496

641.

Forest Oldfield Mouse

Thomasomys silvestris

French: Thomasomys sylvestre / German: \Wald-Paramomaus / Spanish: Raton de erial de bosque

Other common names: Forest Thomasomys, Sylvan Thomasomys

Taxonomy. Thomasomys silvestris Anthony, 1924 , “Las Maquinas [Las Maquinas], on Santo Domingo trail, west of Corazon, Western Andes [Pichincha], Ecuador; altitude 7000 feet [=°2134°m].” This species is monotypic.

Distribution. W Andes slope of Ecuador; records from E slope in Morona Santiago need confirmation.

Descriptive notes. Head-body 95-127 mm, tail 139-157 mm, ear 18 mm, hindfoot 28-30 mm. No specific data are available for body weight. Dorsum of the Forest Oldfield Mouse varies from brownish cast (hairs slate-colored basally and tipped with raw umber or mummy-brown) to much darker, more sooty tone; venter is uniformly gray plumbeous, washed with light brown, and not countershaded with dorsal pelage. Mystacial vibrissae are moderately long and extend slightly beyond posterior margin of pinnae when bent. Ears are moderately long and clove-brown. Tail is distinctly long (112-150% of head-body length), slender, almost naked, and almost uniformly clove-brown above and slightly lighter below, with terminal white tip. Hindfoot is moderately long, narrow, and clove-brown above, with distinct gap between thenar and hypothenar pads.

Habitat. Montane forest, subtropical forest, temperate forest, and adjacent paramo at elevations of 1800-4500 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 Lust.

Bibliography. Anthony (1924a), Brito & Ojala-Barbour (2016), Lee et al. (2011), Luna & Pacheco (2002), Musser & Carleton (2005), Pacheco (2003, 2015b, 2016h), Tirira (2007), Voss (2003).

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. W Andes slope of Ecuador; records from E slope in Morona Santiago need confirmation.