Tokudaia
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.This Murinae article is a stub.