Salpingotus kozlovi Vinogradov 1922
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
Salpingotus
Salpingotus kozlovi

description: 2.
Kozlov’s Pygmy Jerboa
Salpingotus kozlovi
French: Gerboise de Kozlov / German: Kozlov-Dreizehenzwergspringmaus / Spanish: Jerbo pigmeo de Kozlov
Other common names: Three-toed Dwarf Jerboa
Taxonomy. Salpingotus kozlovi Vinogradov, 1922,
Khara-Khoto, Inner Mongolia, China.
Salpingotus kozlovi is in the subgenus Salpingotus. Two subspecies recognized.
Subspecies and Distribution.
S.k.kozloviVinogradov,1922—NChina(NXinjiang,NWGansu,WInnerMongolia[=NeiMongol],Ningxia,andNWShaanxi)andSMongolia.
S. k. xiangi Hou Lanxin & Jiang Wei, 1994 — W China (S Xinjiang).
Descriptive notes. Head-body 52-68 mm, tail 110-135 mm, ear 11-16 mm, hindfoot 24-28 mm; weight 12-20 g. Kozlov’s Pygmy Jerboa is very small; females are slightly larger than males. Condylobasal lengths of skulls are 18:2—-20-4 mm, mastoid breadths are 16-5-19-3 mm, and maxillary tooth row lengths are 3:4-3-9 mm. Head and dorsum are light sandy or ocherous sandy, with scattered gray on rear part of back; sides and ventral pelage are pure white. Tail is long, covered with scattered long hairs forming darkgray terminal tuft, and itis fatty only in the anterior one-third in adults in the second one-half of summer. Hindfeet have three toes, covered below with dense brushes of white hairs, and conic calluses at bases of toes are absent. Ears are short and tubiform. Auditory bullae are greatly inflated and strongly projecting from under braincase laterally and caudally. Mastoid cavity is large and completely subdivided into three sections by septum. In volume, mastoid cavity is about twice as large as tympanic cavity. Front surfaces of incisors are yellow. P' is present and about equal in diameter to M?. Molars are low-crowned, with tuberculous surfaces; crown heights of unworn molars are 70% of their length. Glans penis is small, thin, elongated, cone-shaped, and not subdivided into lobes, with surface covered by extremely small plaques not differentiated in size. Os penis (baculum) is rudimentary and 12chislike; its length is about equal to one-tenth of the length of glans penis. Most individuals have a chromosomal complement of 2n = 54 and FN = 92; however, some individuals have chromosome mosaics with 2n in different cells varying from 53 to 58 (most frequently 54 and 58). There are probably are two pairs of supernumerary chromosomes.
Habitat. Sand dunes in deserts, usually covered by scattered saxaul (Haloxylon aphyllum, Amaranthaceae) shrubs.
Food and Feeding. Diets of Kozlov’s Pygmy Jerboas contain about equal amounts of seeds and insects. Foraging typically involves ploughing nose through sandy surface of a dune in search of seeds and insects.
Breeding. Pregnant Kozlov's Pygmy Jerboas were recorded in southern Xinjiang in April-May and Mongolia in July. Females produce one litter per year. Litters have 1-5 young (average 2-6).
Activity patterns. Kozlov’s Pygmy Jerboa is strongly nocturnal. Hibernation starts in September, but it is not known when it ends.
Movements, Home range and Social organization. Home range of Kozlov’s PygmyJerboa is ¢.0-3 ha. Social interactions are mainly agonistic but distant (avoiding), usually without direct fighting. Summer burrows are simple, with one entrance and one nest chamber 5-7 cm in diameter at depths of 20-25 cm.
Status and Conservation. Classified as Least Concern on The [UCN Red List.
Bibliography. Hou Lanxin & Jiang Wei (1994), Sokolov et al. (1996), 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 83, DOI: 10.5281/zenodo.6591722