The East Asian finless porpoise (Neophocaena asiaeorientalis sunameri) is a small, freshwater cetacean species. This species is a group of small-sized, toothed whales that are mainly distributed in southern and eastern Asia. Their distribution includes the coastal waters of the western Pacific Ocean, Indian Ocean, Sea of Japan, and they also appear in the Bohai Sea, Yellow Sea, East China Sea, South China Sea, and middle and lower reaches of the Yangtze River in Chinese waters. Previous research found that the genetic differentiation between the Yangtze finless porpoise (N. a. asiaeorientalis) and East Asian finless porpoise reached interspecific level.
