Black-eared bank vole

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Black-eared bank vole
Systematics
Superfamily : Mice-like (Muroidea)
Family : Burrowers (Cricetidae)
Subfamily : Voles (arvicolinae)
Tribe : Myodini
Genre : Père david voles ( Eothenomys )
Type : Black-eared bank vole
Scientific name
Eothenomys olitor
( Thomas , 1911)

The black- eared bank vole or black-eared red-backed vole ( Eothenomys olitor ) is a rodent species from the subfamily of voles (Arvicolinae). It occurs in southern China in Yunnan , Sichuan and Guizhou .

features

The black-eared bank vole is the smallest species of the genus and reaches a head-trunk length of 8.0 to 9.2 centimeters with a tail of 2.9 to 3.9 centimeters in length . The rear foot length is 14 to 17 millimeters, the ear length 9 to 11 millimeters. It resembles the Père David's bank vole ( Eothenomys melanogaster ) in appearance , but is smaller. The back fur is dark brown to blackish brown and can be almost black. The peritoneum is slate gray. The tail and feet are brown to dark brown. The skull is small and flattened dorsoventrally compared to related species. An important distinguishing feature from other species of the genus is the expression of the enamel folds on molar M2, in which the first of the three folds on the tongue side of the tooth is relatively large.

distribution

The black-eared bank vole is found in the mountainous regions of southern China in Yunnan and southern Sichuan and western Guizhou . The distribution area is highly fragmented and extends in Yunnan from the area between the Saluen and the Mekong over the Ailao Shan to the area east of the Mekong and the adjacent areas of Sichuan and Guizhou.

Way of life

Almost no information is available about the way of life of the species. The Yunnan bank vole lives in mountain forest regions at altitudes of 1,800 to 3,350 meters.

Systematics

The black-eared bank vole is classified as an independent species within the genus Eothenomys , which consists of eight species. The first scientific description comes from the British zoologist Oldfield Thomas , who described the species in 1911 using individuals from northeast Yunnan around Zhaotong from a height of 2042 meters. The species was assigned to the genus or subgenus Anteliomys , but is now classified in the Eothenomys chinensis species complex within the genus Eothenomys .

Smith & Yan Xie 2009 describe two subspecies for the distribution areas in China:

  • Eothenomys olitor olitor in northeastern Yunnan in the Zhaotong area .
  • Eothenomys olitor hypolitor from the west of Yunnan around Yingjiang

Status, threat and protection

The black-eared bank vole is classified as Least Concern by the International Union for Conservation of Nature and Natural Resources (IUCN). This is justified with the relatively large distribution area and the assumed large populations of the species that also occur in protected areas. Potential endangerment risks for the species are not known.

supporting documents

  1. ↑ a b c d Darrin Lunde, Andrew T. Smith: Black-Earred Chinese Vole. 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. 225.
  2. ↑ a b c Eothenomys olitor . 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 .
  3. ↑ a b c d Eothenomys olitor in the IUCN Red List of Threatened Species 2016.2. Listed by: AT Smith, CH Johnston, 2008. Retrieved October 21, 2016.

literature

  • Darrin Lunde, Andrew T. Smith: Black-Earred Chinese Vole. 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. 225.

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