IUCN threat status:

Critically Endangered (CR)


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Muennink's spiny rat

Muennink's spiny rat (Tokudaia muenninki) is a species of rodent in the family Muridae.[2] Endemic to Okinawa Island, Japan, its natural habitat is temperate forests. The karyotype has 2n = 44.[2] Its sex chromosomes are abnormally large, while the other two species in Tokudaia have lost their Y chromosome.[3]

In March 2008, the first wild specimen in over 30 years was caught in the northern part of Okinawa island.[4]


  1. ^ Ishii, N.; Kaneko, Y. (2008). "Tokudaia muenninki". 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. pp. 1512–1513. ISBN 978-0-8018-8221-0. OCLC 62265494. 
  3. ^ Murata, C.; Yamada, F.; Kawauchi, N.; Matsuda, Y.; Kuroiwa, A. (2011-12-24). "The Y chromosome of the Okinawa spiny rat, Tokudaia muenninki, was rescued through fusion with an autosome". Chromosome Research 20: 111–125. doi:10.1007/s10577-011-9268-6.  edit
  4. ^ 幻のネズミ、30年ぶり捕獲 沖縄北部の絶滅危惧種


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