Ryukyu spiny rat

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Ryukyu spiny rat
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Muridae
Genus: Tokudaia
Species: T. osimensis
Binomial name
Tokudaia osimensis
(Y. Abe, 1934)
Tokudaia osimensis distribution.png

The Ryukyu spiny rat (Tokudaia osimensis) is a species of rodent in the family Muridae.[2] Endemic to the Amami (Ryukyu) islands in Japan, its natural habitat is temperate forests. The karyotype has an odd diploid number, 2n = 25.[2] Like its relative T. tokunoshimensis, it has lost its Y chromosome and SRY gene.[3]

See also[edit]


  1. ^ Ishii, N.; Kaneko, Y. (2008). "Tokudaia osimensis". IUCN Red List of Threatened Species. Version 2014.2. International Union for Conservation of Nature. Retrieved 2014-10-14. 
  2. ^ a b Musser, G. G.; Carleton, M. D. (2005). "Superfamily Muroidea". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. p. 1513. ISBN 978-0-8018-8221-0. OCLC 62265494. 
  3. ^ KAYOKO GEJI (August 23, 2012). "Y chromosome losing all genes, but men won't become extinct". The Asahi Shimbun. Retrieved 11 January 2014.