Fuchoreutes naso Sclater 1891
Creators: name: Don E. Wilson
name: Russell A. Mittermeier
name: Thomas E. Lacher, Jr
Publisher: name: Lynx Edicions
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Dipodidae
Fuchoreutes
Fuchoreutes naso

description: 8.
Long-eared Jerboa
Fuchoreutes naso
French: Gerboise a longues oreilles / German: RiesenohrSpringmaus / Spanish: Jerbo de orejas largas
Taxonomy. Euchoreutes naso Sclater, 1891,
“probably...sandy plains round city of Yarkand,” Xinjiang, China.
Three subspecies are recognized.
Subspecies and Distribution.
E. n. naso Sclater, 1891 — W China (Tarim Basin in S Xinjiang).
E. n. alashanicus A. B. Howell, 1928 — N China (Helan [= Alashan] Mts, Ordos Desert, and Qaidam Basin in Gansu, W Inner Mongolia [= Nei Mongol], and N Qinghai) and S Mongolia.
E. n. ywuensis Ma Yong & Li Sirua, 1979 — NW China (E Dzungarian Basin in NE Xinjiang).
Descriptive notes. Head-body 90-105 mm, tail 145-180 mm, ear 39-49 mm, hindfoot 39-46 mm; weight 23-45 g. There is no significant secondary sexual dimorphism. Condylo-basal lengths of skulls are 25-28 mm, mastoid breadths are 14-2-17-5 mm, and maxillary tooth row lengths are 4-2-5-5 mm. Head and dorsum are ocherous gray; sides and ventral pelage are pure white; and tail banner is notflattened, with narrow white basal ring, long black subterminal field, and relatively short white terminal tuft. Toes of hindfeet are covered from below with brushes of relatively short soft hairs; external hairs of brushes are white and internal hairs black or dark brown; conic calluses at bases of toes are present. Auditory bullae are significantly inflated and project from under braincase laterally and caudally. Mastoid cavity is large and completely subdivided into three sections by septa. In volume, mastoid cavity is about equal in size to tympanic cavity. Front surfaces of incisors are white. P! is large, about two times larger in diameter than M?. Molars are low-crowned, with tuberculous surfaces; crown heights of unworn molars are ¢.50% of their lengths; and tubercula are high, with sharp-pointed tops. Glans penis is massive, cylindrical, significantly elongated, with one shallow longitudinal dorsal fold not subdivided into lobes, and without aciculae or scales on its surface. Os penis (baculum) is large (its length about equal to length of glans penis), straight, with small flat horizontal broadenings at proximal end and not broadening distal end, which is bent vertically at the right angle. Chromosomal complement has 2n = 48 and FN = 92.
Habitat. Flat sandy and sandy-gravel terraces in true and extra-arid desert. The Longeared Jerboa avoids non-stabilized sands.
Food and Feeding. The Long-eared Jerboa specializes on insects; plant materials are less than 5% of the diet.
Breeding. Pregnant Long-eared Jerboas were recorded in southern Xinjiang in May and Mongolia in July. Litters have 2-6 young (average 3-1).
Activity patterns. The Long-eared Jerboais strongly nocturnal.
Movements, Home range and Social organization. Home ranges of Long-eared Jerboas are 2-14-5 ha for males and 2-2-8 ha for females. Home ranges are isolated or weakly overlap. Burrows are simple and have two entrances and one nest chamber at a depth of ¢.30 cm.
Status and Conservation. Classified as Least Concern on The IUCN Red List.
Bibliography. Sokolov et al. (1996), Stubbe et al. (2007), Zhang Yongzu et al. (1997).
description: Published as part of Don E. Wilson, Russell A. Mittermeier & Thomas E. Lacher, Jr, 2017, Dipodidae, pp. 81-100 in Handbook of the Mammals of the World – Volume 7 Rodents II, Barcelona :Lynx Edicions on page 1, DOI: 10.5281/zenodo.6591722