| Tokudaia Temporal range: Late Pleistocene to Recent
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Rodentia |
| Family: | Muridae |
| Tribe: | Apodemini |
| Genus: | Tokudaia Kuroda, 1943 |
| Type species | |
| Rattus jerdoini osimensis[1] | |
| Species | |
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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]
- Muennink's spiny rat, Tokudaia muenninki
- Ryukyu spiny rat, Tokudaia osimensis
- Tokunoshima spiny rat, Tokudaia tokunoshimensis
At least Tokudaia osimensis may be a cryptic species complex.
- ^ a b Musser, G. G.; Carleton, M. D. (2005). "Genus Tokudaia". In Wilson, D. E.; Reeder, D. M. (eds.). 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.
- ^ Sutou, S.; Mitsui, Y.; Tsuchiya, K. (2001). "Sex determination without the Y Chromosome in two Japanese rodents Tokudaia osimensis osimensis and Tokudaia osimensis spp". Mammalian Genome. 12 (1): 17–21. doi:10.1007/s003350010228.
- ^ 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.