East Asia
The East Asia Region extends from the Amur River in Russia south through Japan, Korea, China, Indochina and Indonesia, and west to include India. A total of 356 species (87 genera) are known from the region in three families: Unionidae, Margaritiferidae and Etheriidae. The East Asia Region ranks second in species richness after Nearctica.
The East Region is subdivided into seven subregions, each with a characteristic freshwater mussel assemblage. The low-richness basins north of the Amur draining into the Bering Sea and Sea of Okhotsk comprise Beringia (AS1; 3 gen, 3 spp.). The Amur-Korea Subregion (AS2; 17 gen, 30 spp. ) includes the Amur Basin and rivers draining to the Sea of Japan and the Yellow Sea, as far south as the Liao He Basin. Japan, Sakhalin Island, and the Kuril Islands are group as the Japan-Sakhalin Subregion (AS3; 14 gen, 28 spp.). The Yangtze-Huang Subregion (AS4; 27 gen, 85 spp.) covers the basins from the Pei River south through the Qiantang, as well as Taiwan. The area from southern China to the western Thailand, including the Mekong, is the Indochina Subregion (AS5; 43 gen, 145 spp.). The larger islands of Indonesia and the Philippines we group as the Sunda-Philippines Subregion (AS6; 16 gen, 31 spp.).The India-Myanmar Subregion (AS7; 19 gen, 81 spp.) extends from the Salween River in the east to the Indus on its western frontier. New Guinea is part of the Australasian Region, and Sulawesi does not seem to have any freshwater mussels.
Endemic species are marked with an asterisk (*). Beringia Subregion (AS1)
Amur-Korea Subregion (AS2)
Japan-Sakhalin Subregion (AS3)
Yangtze-Huang Subregion (AS4)
Indochina Subregion (AS5)
Sunda-Philippines Subregion (AS6)
India-Myanmar Subregion (AS7)
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