Western thick-tailed jerboa
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Western thick-tailed jerboa ( Stylodipus telum ) |
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| Stylodipus telum | ||||||||||||
| ( Lichtenstein , 1823) |
The western thick-tailed jerboa ( Stylodipus telum ) is a species of rodent from the genus of the thick-tailed jerboa ( Stylodipus ). It occurs in the north of the Chinese auto troop area Xinjiang as well as in Kazakhstan , Uzbekistan , Turkmenistan and the eastern Ukraine as well as the northern Caucasus .
features
The western thick-tailed jerboa reaches a head-torso length of 10.4 to 13.3 centimeters with a tail of 14.0 to 16.5 centimeters in length and a weight of about 70 to 90 grams. The rear foot length is 50 to 54 millimeters, the ear length 15 to 21 millimeters. The back fur is light grayish yellow in summer with a dark tint, which is formed by tentacles with black-gray tips. The sides of the body are light straw yellow and also darkly tinted. The top of the head is colored dark. A white stripe runs across the hips.
| 1 | · | 0 | · | 0 | · | 3 | = 16 |
In contrast to the eastern thick-tailed gerbil ( Stylodipus andrewsi ), the adult animals of the species have no upper premolars and the tympanic cavity (bulla tympanica) is significantly smaller. In addition, the bony snout (rostrum) is shorter and has shorter 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 three molars , premolars missing. In total, they have a set of 16 teeth.
distribution
The western thick-tailed jerboa occurs in the north of the Chinese autonomous region of Xinjiang as well as in Kazakhstan , Uzbekistan , Turkmenistan and the eastern Ukraine and the northern Caucasus .
Way of life
The western thick-tailed jerboa is nocturnal and lives in desert and semi-desert areas, although it does not only appear in sandy regions and prefers loamy soils. It is associated with salt plants and Artemisia , but is also found in pine stands. Unlike most jerboa, it moves running and not jumping. It feeds on green parts of plants, buds, roots and seeds. The animals live in permanent burrows that reach a length of 100 to 270 centimeters and a depth of 20 to 120 centimeters and have several exits that are closed by earth blocks. They are territorial and same-sex animal territories do not overlap.
The animals have offspring twice a year in spring and autumn; the litter consists of two to four young animals.
Systematics
The western 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 Hinrich Lichtenstein from 1923, who described the species using individuals from the northeastern shore of the Aral Sea in Kazakhstan . The eastern thick-tailed gerbil ( Stylodipus andrewsi ) is sometimes added to this species, but mostly they are regarded as separate species.
Status, threat and protection
The western big-tailed jerboa is classified by the International Union for Conservation of Nature and Natural Resources (IUCN) as Least Concern. This is justified with the very large distribution area and the assumed large populations of the species. There are no inventories and in parts of the distribution area there were declines in populations, however, there are no known factors that could endanger the existence of this species.
supporting documents
- ↑ a b c d e f 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 , pp. 205-206.
- ↑ 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 Stylodipus telum ( Memento of the original from July 4, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . 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 .
- ↑ a b Stylodipus telum in the Red List of Threatened Species of the IUCN 2015.4. Posted by: K. Tsytsulina, N. Formozov, I. Zagorodnyuk, B. Sheftel, 2008. Retrieved July 4, 2016.
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 , pp. 205-206.
Web links
- Stylodipus telum inthe IUCN Red List of Threatened Species 2015.4. Posted by: K. Tsytsulina, N. Formozov, I. Zagorodnyuk, B. Sheftel, 2008. Retrieved July 4, 2016.