Chibchanomys orcesi, Jenkins & Barnett, 1997

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 : 406

publication ID	https://doi.org/ 10.5281/zenodo.6707142
DOI	https://doi.org/10.5281/zenodo.6726738
persistent identifier	https://treatment.plazi.org/id/03F06D13-FFD1-2018-08AF-16DE00FDF924
treatment provided by	Carolina
scientific name	Chibchanomys orcesi
status

Treatment

343. View Plate 19: Cricetidae

Orces’s Andean Water Mouse

Chibchanomys orcesi View in CoL

French: Ichthyomys d'Orces / German: Orces-Andenwassermaus / Spanish: Raton de agua de Orces

Other common names: Las Cajas Ichthyomyine, Las Cajas Water Mouse

Taxonomy. Chibchanomys orcesi Jenkins & Barnett, 1997 View in CoL , Lake Luspa, Las Cajas, Provincia Azuay, Ecuador.

This species is monotypic.

Distribution. S Ecuador to C Peru. View Figure

Descriptive notes. Head-body 103-107 mm, tail 108-122 mm, ear 9-14 mm, hindfoot 19-24 mm; weight 35-50 g. Orces’s Andean Water Mouse is relatively small. Dorsum is gray-black, contrasting silvery or pale-gray venter. Supraorbital vibrissae are absent, and pinnae are small and hidden by fur of head. Manus has five separate plantar pads. Pes has peripheral rigid silvery hairs, and claw of pedal fifth digit extends beyond first interphalangeal joint of fourth digit. Tail is longer than headbody length.

Habitat. Mountain streams in grassy paramo at elevations of 2400-3700 m.

Food and Feeding. Diet mainly consists of aquatic insects and smallfish.

Breeding. No information.

Activity patterns. Orces’s Andean Water Mouse is nocturnal and semi-aquatic.

Movements, Home range and Social organization. Orces’s Andean Water Mouse is solitary. It is a rare species, and has a low population density and restricted range.

Status and Conservation. Classified as Data Deficient on The IUCN Red List. This classification 1s due to lack of information on extent of occurrence, threats, status, and ecological requirements of Orces’s Andean Water Mouse.

Bibliography. Barnett (1997 1999), Jenkins & Barnett (1997), Voss (2015b).

Figures

321. Groove-toothed Cotton Rat (Sigmodon alstoni), 322. Ecuadorean Cotton Rat (Sigmodon inopinatus), 323. Peruvian Cotton Rat (Sigmodon peruanus), 324. White-eared Cotton Rat (Sigmodon leucotis), 325. Tawny-bellied Cotton Rat (Sigmodon fulviventer), 326. Yellow-nosed Cotton Rat (Sigmodon ochrognathus), 327. Hispid Cotton Rat (Sigmodon hispidus), 328. West Mexican Cotton Rat (Sigmodon mascotensis), 329. Arizona Cotton Rat (Sigmodon arizonae), 330. Toltec Cotton Rat (Sigmodon toltecus), 331. Allen’s Cotton Rat (Sigmodon alleni), 332. Burmeister’s Cotton Rat (Sigmodon hirsutus), 333. Montane Cotton Rat (Sigmodon zanjonensis), 334. Miahuatlan Cotton Rat (Sigmodon planifrons), 335. Musso’s Fish-eating Rat (Neusticomys mussoi), 336. Montane Fish-eating Rat (Neusticomys monticolus), 337. Voss’s Fish-eating Rat (Neusticomys vossi), 338. Venezuelan Fish-eating Rat (Neusticomys venezuelae), 339. Guianan Fish-eating Rat (Neusticomys oyapocki), 340. Ferreira’s Fish-eating Rat (Neusticomys ferreirai), 341. Peruvian Fish-eating Rat (Neusticomys peruviensis), 342. Northern Andean Water Mouse (Chibchanomys trichotis), 343. Orces’s Andean Water Mouse (Chibchanomys orcesi), 344. Earless Water Mouse (Anotomys leander), 345. Pittier’s Crab-eating Rat (Ichthyomys pittieri), 346. Common Crab-eating Rat (Ichthyomys hydrobates), 347. Tweedy’s Crab-eating Rat (Ichthyomys tweedii), 348. Stolzmann’s Crab-eating Rat (Ichthyomys stolzmanni), 349. Goldman's Water Mouse (Rheomys raptor), 350. Thomas's Water Mouse (Rheomys thomasi), 351. Underwood’s Water Mouse (Rheomys underwoodi), 352. Mexican Water Mouse (Rheomys mexicanus)