the japanese river otter became extinct on august 28, 2012.
when did the japanese river otter become extinct?
august 28 , 2012
the ("lutra lutra whiteleyi") is an extinct variety of otter formerly widespread in japan. dating back to the 1880s, it was even seen in tokyo. the population suddenly shrank in the 1930s, and the mammal nearly vanished. since then, it has only been spotted several times, in 1964 in the seto inland sea, and in the uwa sea in 1972 and 1973. the last official sighting was in the southern part of kōchi prefecture in 1979, when it was photographed in the mouth of the shinjo river in susaki. it was subsequently classified as a "critically endangered" species on the japanese red list. on august 28, 2012, the japanese river otter was officially declared extinct by the ministry of the environment. it is the official animal symbol of ehime prefecture. in february 2017, a wild otter was caught on camera on tsushima island, nagasaki prefecture. however, it is not known whether the observed otter was a japanese river otter.
japanese river otter
research done in the early 1990s by the department of biology of kochi university in japan revealed some interesting facts about the genes of the japanese river otter. for many years, it was thought that the japanese river otter was a subspecies of the eurasian otter "lutra lutra". however, the studies done in kochi university revealed something different. by comparing the mitochondrial cytochrome b gene of a mummified japanese river otter corpse with eurasian otters from latvia and china, it was proven that the japanese river otter was actually different, and was therefore not a subspecies. the name for the japanese river otter was then changed from "l. l. whiteleyi" to "lutra nippon".
japanese river otter