Subspecies and Distribution. N.a.asiaeorientalisPilleri&Gihr,1972—middleandlowerreachesoftheYangtze River,CChina. N. a. sunameri Pilleri & Gihr, 1975 — shallow marine waters of E Asia; records are known from Japan, South Korea, China, and Taiwan. Occurrence in North Korea is not documented butis strongly suspected, and a stranding record from the island of Okinawa, S Japan, is considered to be extralimital. in Phocoenidae

Subspecies and Distribution. N.a.asiaeorientalisPilleri&Gihr,1972—middleandlowerreachesoftheYangtze River,CChina. N. a. sunameri Pilleri & Gihr, 1975 — shallow marine waters of E Asia; records are known from Japan, South Korea, China, and Taiwan. Occurrence in North Korea is not documented butis strongly suspected, and a stranding record from the island of Okinawa, S Japan, is considered to be extralimital.