Eastern thick-tailed gerbil
| Eastern thick-tailed gerbil | ||||||||||||
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| Stylodipus andrewsi | ||||||||||||
| Allen , 1925 |
The eastern thick-tailed jerboa ( Stylodipus andrewsi ) is a rodent species from the genus of the thick-tailed jerboa ( Stylodipus ). It occurs in the north of the People's Republic of China and in Mongolia .
features
The eastern thick-tailed jerboa reaches a head-torso length of 11.3 to 13.0 centimeters with a tail 13.5 to 15.0 centimeters in length and a weight of about 60 grams. The rear foot length is 50 to 59 millimeters, the ear length 16 to 18 millimeters. The fur on the back is straw yellow, the head gray on top with whitish spots over the eyes and characteristic white spots behind the ears. A white stripe runs across the hip and the belly is completely white in color. The tail is noticeably thickened by subcutaneous adipose tissue and covered with yellow hair, which becomes longer at the tip of the tail and forms a flat, feather-like fan. The last 30 millimeters of the tail are black. The hind foot has three toes, of which the middle is the longest, the soles of the feet are hairy and have a brush-like pad under the toes.
| 1 | · | 0 | · | 1 | · | 3 | = 18 |
| 1 | · | 0 | · | 0 | · | 3 |
In contrast to the western thick-tailed gerbil ( Stylodipus telum ), the species has upper premolars and the tympanic cavity (bulla tympanica) is significantly larger. In addition, the bony snout (rostrum) is longer and has longer nasal bones .
The animals have a one in the upper jaw per half incisor tooth trained incisors (incisive) to which a tooth gap ( diastema follows). This is followed by a premolar and three molars . In contrast, they do not have a premolar in the lower jaw. In total, they have a set of 18 teeth.
distribution
The eastern thick-tailed jerboa occurs in the north of the People's Republic of China and neighboring Mongolia . In the People's Republic of China it is known from the provinces of Nei Mongol , Ningxia and Gansu . In Mongolia she lives in the Gobi desert in the Alashan area and parts of the eastern and northern Gobi.
Way of life
The eastern thick-tailed gerbil is nocturnal and lives in sandy semi-deserts, grassy areas and also in coniferous forest and bush habitats. It feeds on green parts of plants, roots and seeds. The animals have offspring once a year, the litter consists of two to four young animals.
Systematics
The eastern thick-tailed jerboa is classified as an independent species within the genus of the thick-tailed jerboa ( Stylodipus ), which consists of three species. The first scientific description comes from Glover Morrill Allen from 1925, who described the species on the basis of individuals on the Ussuk from Camp Ondai Sair in Mongolia. Sometimes it is combined into one species with the western thick-tailed jerboa ( Stylodipus telum ).
Status, threat and protection
The Eastern Big-tailed Jerboa is classified as Least Concern by the International Union for Conservation of Nature and Natural Resources (IUCN). This is justified with the large distribution area and the assumed large stocks of the species, partly also in protected areas, as well as the not very strong decline in stocks. There are no known factors that could endanger the survival of this species.
supporting documents
- ↑ a b c d e Andrew T. Smith: Andrews' Three-Toed Jerboa. In: Andrew T. Smith , Yan Xie: A Guide to the Mammals of China. Princeton University Press, Princeton NJ 2008, ISBN 978-0-691-09984-2 , p. 205.
- ↑ Andrew T. Smith: Family Dipodidae / Subfamily Allactaginae. In: Andrew T. Smith , Yan Xie: A Guide to the Mammals of China. Princeton University Press, Princeton NJ 2008, ISBN 978-0-691-09984-2 , pp. 198-199.
- ↑ a b c Stylodipus andrewsi in the IUCN Red List of Threatened Species 2015.4. Posted by: N. Batsaikhan, D. Avirmed, D. Tinnin, AT Smith, 2008. Retrieved July 4, 2016.
- ↑ a b Stylodipus andrewsi ( Memento from July 4, 2016 in the Internet Archive ). In: Don E. Wilson , DeeAnn M. Reeder (Eds.): Mammal Species of the World. A taxonomic and geographic Reference. 2 volumes. 3. Edition. Johns Hopkins University Press, Baltimore MD 2005, ISBN 0-8018-8221-4 .
literature
- Andrew T. Smith: Andrews' Three-Toed Jerboa. In: Andrew T. Smith , Yan Xie: A Guide to the Mammals of China. Princeton University Press, Princeton NJ 2008, ISBN 978-0-691-09984-2 , p. 205.
Web links
- Stylodipus andrewsi inthe IUCN Red List of Threatened Species 2015.4. Posted by: N. Batsaikhan, D. Avirmed, D. Tinnin, AT Smith, 2008. Retrieved July 4, 2016.