Hainan white-toothed shrew
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| Wang , 1966 |
The Hainan white-toothed shrew ( Crocidura wuchihensis ) is a species of shrew from the genus of the white-toothed shrew ( Crocidura ). It is likely to be endemic to the Chinese island of Hainan , but may also be found in other parts of Southeast Asia.
features
With a head-torso length of 5.5 to 6.5 centimeters and a weight of 3.5 to 6 grams, the Hainan white-toothed shrew is one of the smaller shrew species in Asia and is therefore slightly smaller than the Indochina white-toothed shrew found in Southeast Asia ( Crocidura indochinensis ). The tail reaches a length of 35 to 42 millimeters. The hind foot is 10 to 13 millimeters long and the ear 6 to 9 millimeters. The back fur is dark brown-gray, with the individual hairs iron gray at the base and brown near the tips, sometimes with a silver-gray tip. The belly is a little grayer and the tops of the feet are whitish with brown pigmentation to the side. The tail is brown with long bristles on top. It can only be reliably distinguished from the Indochina white-toothed shrew by the proportions of the skull and, above all, the somewhat narrower skull.
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The skull has a total length of 15 to 17 millimeters. Like all species of the genus, the species has one incisor per half in the upper jaw and then three single-pointed teeth, a premolar and three molars . In the lower jaw, however, it has a single canine behind the incisor. In total, the animals have a set of 28 teeth. As with all white-toothed shrews, the tooth roots are not pigmented in contrast to those of the red- toothed shrews.
distribution
The Hainan white-toothed shrew is probably endemic to the island of Hainan , which belongs to the People's Republic of China , but other animals ascribed to the species have been found in the Chinese autonomous region of Guangxi and in the province of Yunnan as well as in Vietnam . However, these animals could also be assigned to a new, as yet undescribed species. The height distribution ranges from 1300 to 1500 meters.
Way of life
As with many species of shrew, the way of life of the Hainan white-toothed shrew is largely unexplored. It is found mostly in forests and like all shrews, this species feeds on invertebrates, especially insects. Nothing is known about reproduction.
Systematics
The Hainan white-toothed shrew is classified as an independent species within the genus of the white-toothed shrew ( Crocidura ), which consists of around 170 species. The first scientific description comes from Wang Sung from 1966, where the type locality is Mt. Wuchih on the Chinese island of Hainan. This species was temporarily assigned together with the Indochina white-toothed shrew ( Crocidura indochinensis ) to the Horsfield white-toothed shrew ( Crocidura horsfieldii ) living in Sri Lanka and India , but today both are considered separate species. Animals found in the north of Vietnam and assigned to the species could, however, be assigned to a new, as yet undescribed species. This is also suggested by molecular genetic data, as these initially limit the Hainan white-toothed shrew to Hainan. As a result, this is more closely related to the Zaitsev white-toothed shrew ( Crocidura zaitsevi ), but the animals from Guangxi are related to the Indochina white-toothed shrew. The Guangxi population is therefore an independent species.
Today, apart from the nominate form Crocidura wuchihensis wuchihensis, no further subspecies are distinguished within the species .
Threat and protection
The International Union for Conservation of Nature and Natural Resources (IUCN) does not classify the Hainan white-toothed shrew into a hazard category due to the lack of data on taxonomy, population and threat, and instead lists it as "insufficient data" (data deficient). There are no known dangers to its existence, but if the species is dependent on undisturbed forests, habitat changes through deforestation and conversion into human settlement and agricultural areas will become a potential threat.
literature
- Robert S. Hoffmann, Darrin Lunde: Wuchi 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 , p. 302.
Web links
- Crocidura wuchihensis inthe IUCN Red List of Threatened Species 2013.2. Posted by: D. Lunde, 2008. Retrieved January 18, 2014.
supporting documents
- ↑ a b c d Robert S. Hoffmann, Darrin Lunde: Wuchi 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 , p. 302.
- ↑ a b c Crocidura wuchihensis in the Red List of Threatened Species of the IUCN 2013.2. Posted by: D. Lunde, 2008. Retrieved January 18, 2014.
- ↑ Paulina D. Jenkins, Darrin P. Lunde, Clive B. Moncrieff: Descriptions of new species of Crocidura (Soricomorpha: Soricidae) from mainland Southeast Asia, with synopses of previously described species and remarks on biogeography. In: RS Voss, MC Carleton (Ed.): Systematic mammalogy: contributions in honor of Guy G. Musser. Bulletin of the American Museum of Natural History 331, 2009, pp. 356-405
- ↑ a b c d e f Crocidura wuchihensis . 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 .
- ↑ Shaw Tsen-Hwang, Wang Sung, Lu Chang-Kwun, Chang Luan-Kuang: A survey of the mammals of Hainan Island, China. Acta Zootaxonomica Sinica 3, 1966, pp. 260-276 ( [1] )
- ↑ Shunde Chen, Jiao Qing, Zhu Liu, Yang Liu, Mingkun Tang, Robert W. Murphy, Yingting Pu, Xuming Wang, Keyi Tang, Keji Guo, Xuelong Jiang, Shaoying Liu: Multilocus phylogeny and cryptic diversity of white-toothed shrews ( Mammalia, Eulipotyphla, Crocidura) in China. BMC Evolutionary Biology 20, 2020, p. 29, doi: 10.1186 / s12862-020-1588-8