Amur long-clawed shrew
| Amur long-clawed shrew | ||||||||||||
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Sorex unguiculatus in Tama Zoo , Japan |
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| Scientific name | ||||||||||||
| Sorex unguiculatus | ||||||||||||
| Dobson , 1890 |
The Amur long-clawed shrew ( Sorex unguiculatus ) is a species of shrew from the genus of the red -toothed shrew ( Sorex ). It occurs in Russia , in the northeastern People's Republic of China , in northeastern Korea and on several Japanese islands.
features
With a head-torso length of 7.0 to 9.1 centimeters and a weight of about 6 to 10 grams, the Amur long-clawed shrew is one of the large species of shrew. The tail reaches a length of 41 to 51 millimeters - and is thus shorter than the rest of the body - the rear foot from 12 to 14 millimeters. The back and peritoneum are dark brown, the belly is a little lighter and slightly gray. The front feet are wide with claws more than three millimeters long, which are significantly longer than those of the rear feet.
| 1 | · | 5 | · | 1 | · | 3 | = 32 |
| 1 | · | 1 | · | 1 | · | 3 |
The skull has a total length of 19 to 21 millimeters. As most species of the genus has the type in the maxilla per half an incisor (incisor) and then five unicuspid teeth, a Vorbackenzahn (premolar) and three molars (molar). In the lower jaw, however, it has a single canine behind the incisor. Overall, the animals have a set of 32 teeth. The tooth roots are colored red as in most red-toothed shrews. The first three single-pointed teeth of the upper jaw decrease slightly in size from one another, the second can also be smaller. However, all three teeth are significantly larger than the following two.
The genome of the Amur long-clawed shrew consists of a diploid chromosome set of 2n = 42 (FN = 68-70).
distribution
The distribution area of the Amur long-clawed shrew is in the extreme northwest of the Asian continent on the Pacific Ocean . It comes in Russia from the estuary of the Amur to Vladivostok including the offshore island Sakhalin , in the northeastern People's Republic of China in the provinces of Heilongjiang and the east Nei Mongol , in the northeast of Korea and on the Japanese islands Rebun , Rishiri , Teuri , Moyuyuri , Yagishiri and Daikoku before.
Way of life
The Amur long-clawed shrew occurs in very different habitats from the lowlands to the mountainous regions, where it mainly populates the leaf litter and the upper layers of the earth. The species reaches a particularly high density in open areas and meadows. It lives partially burrowing in the ground and feeds on invertebrates, especially earthworms and insects as well as snails. In China the species lives partly sympatric with S. caecutiens and S. isodon .
In the southern part of the distribution area, the breeding season extends from early April to late September, in the Amur area it only lasts during the summer months. The females give birth to up to three litters each year, each with three to seven young.
Systematics
The Amur long-clawed shrew is classified as an independent species within the genus of the red -toothed shrew ( Sorex ), which consists of around 80 species. The first scientific description comes from George Edward Dobson from 1890, who described it from the island of Sakhalin and from the area of Nikolayevsk on the Amur in Russia. Within the genus, the species is classified in the subgenus Sorex and assigned to the S. caecutiens group.
Apart from the nominate form Sorex unguiculatus unguiculatus, no further subspecies are distinguished within the species .
Threat and protection
The Amur long-clawed shrew is classified by the International Union for Conservation of Nature and Natural Resources (IUCN) as not endangered (least concern) due to its large distribution area and the non-existent threat to the population.
literature
- Robert S. Hoffmann, Darrin Lunde: Long-Clawed Shrew. 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. 319-320.
Web links
- Sorex unguiculatus inthe IUCN 2013 Red List of Threatened Species . Posted by: H. Abe, SD Ohdachi, K. Tsytsulina, 2008. Retrieved January 2, 2014.
supporting documents
- ↑ a b c d e Robert S. Hoffmann, Darrin Lunde: Long-Clawed Shrew. 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. 319-320.
- ↑ a b c d e Sorex unguiculatus ( Memento from January 3, 2014 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 .
- ↑ a b c d Sorex unguiculatus in the Red List of Threatened Species of the IUCN 2013.2. Posted by: H. Abe, SD Ohdachi, K. Tsytsulina, 2008. Retrieved January 2, 2014.