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Temporal range: Late Pleistocene to Recent
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Muridae
Subfamily: Murinae
Tribe: Apodemurini
Genus: Tokudaia
Kuroda, 1943

See text.

Tokudaia is a genus of murine rodent native to Japan.[1] Known as Ryūkyū spiny rats or spinous country-rats, population groups exist on several non-contiguous islands.[2] Despite differences in name and appearance, they are the closest living relatives of the Eurasian field mouse (Apodemus). Of the three species, both T. osimensis and T. tokunoshimensis have lost their Y chromosome and SRY gene; the sex chromosomes of T. muenninki, on the other hand, are abnormally large.[3]

Named species are:[3]

At least Tokudaia osimensis may be a cryptic species complex.

See also[edit]


  1. ^ Musser, G.G.; Carleton, M.D. (2005). "Genus Tokudaia". In Wilson, D.E.; Reeder, D.M. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 1512–1513. ISBN 978-0-8018-8221-0. OCLC 62265494. 
  2. ^ Mammalian Genome article
  3. ^ a b 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. 

External links[edit]

Data related to Tokudaia at Wikispecies