Crocidura tanakae
| Crocidura tanakae | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
skull |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Crocidura tanakae | ||||||||||||
| Kuroda , 1938 |
Crocidura tanakae is a species of shrew from the genus of the white-toothed shrew ( Crocidura ). It is endemic to the island of Taiwan .
features
With a head-torso length of 7.0 to 8.6 centimeters, Crocidura tanakae is one of the medium-sized shrew species. The tail reaches a length of 47 to 62 millimeters. The rear foot is 12 to 14 millimeters long. The back fur is smoky brown to dark gray-black, on the belly side the color changes gradually to a dark gray. The summer fur is a little darker than the winter fur. The tail is dark brown on the top and a little lighter on the underside, but not clearly contrasted. The species corresponds in its appearance to the eyelash shrew ( Crocidura attenuata ), which occurs on the Chinese mainland and as a subspecies of which it was originally classified, and can only be reliably distinguished from it by examining the genome.
| 1 | · | 3 | · | 1 | · | 3 | = 28 |
| 1 | · | 1 | · | 1 | · | 3 |
The skull has a total length of 20 to 22 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.
The genome of the eyelash shrew was examined in 1997 and 2001 in both the island population in Taiwan and in individuals from mainland China. It was found that the diploid chromosome set on the Chinese mainland consists of 2n = 35–38 (FN = 54) compared to 2n = 40 (FN = 56) on Taiwan. On this basis, the Taiwanese form was raised to the species status of Crocidura tanakae .
distribution
Crocidura tanakae is endemic to the island of Taiwan . The altitude distribution extends to about 2200 meters.
Way of life
Like many shrew species, the way of life of Crocidura tanakae is largely unexplored. It lives in different habitats, especially in grassy areas, bamboo forests and other forest areas and bushes. Like all shrews, this species feeds on invertebrates, mostly insects and worms. Little is known about reproduction, dams with one to three embryos were identified in February and March.
Systematics
Crocidura tanakae is classified as an independent species within the genus of white-toothed shrews ( Crocidura ), which consists of around 170 species. The first scientific description comes from Kuroda from 1938 and referred to an individual from the center of the island of Taiwan. At times it was considered a subspecies and island form of C. attenuata , but has since been separated from this species due to a significantly different genome and is now an independent species.
Today, apart from the nominate form Crocidura tanakae tanakae, no further subspecies are distinguished within the species .
Threat and protection
Crocidura tanakae is classified by the International Union for Conservation of Nature and Natural Resources (IUCN) as least concern due to the assumed large populations in Taiwan and the non-existent endangerment and adaptability to different habitats .
literature
- Robert S. Hoffmann, Darrin Lunde: Taiwanese 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. 301-302.
Web links
- Crocidura tanakae inthe IUCN 2013 Red List of Threatened Species . Listed by: AT Smith, CH Johnston, 2008. Retrieved January 18, 2014.
supporting documents
- ↑ a b c d e Robert S. Hoffmann, Darrin Lunde: Taiwanese 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. 301-302.
- ↑ Crocidura attenuata ( Memento of the original from January 16, 2014 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 Crocidura tanakae in the IUCN Red List of Threatened Species 2013.2. Listed by: AT Smith, CH Johnston, 2008. Retrieved January 18, 2014.
- ↑ a b c d Crocidura tanakae ( Memento of the original from February 3, 2014 in the Internet Archive ) Info: The archive link has been 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 .
