Erhaia
Erhaia is a genus of small to minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Amnicolidae. "Erhaia" is the type genus of the tribe Erhaiini, which is now a synonym of the subfamily Amnicolinae. "Erhaia" (also within the tribe Erhaiini) was originally described as a genus within the Pomatiopsidae in 1985, but Wilke et al. (2000, 2001) moved it to the Amnicolidae. Distribution. The distribution of "Erhaia" includes southern China and India. The center of biodiversity of "Erhaia" in China is located in the provinces of Hunan, Hubei and Sichuan. Distribution also  includes Fujian Province. There is also scattered occurrences of "Erhaia" in Yunnan Province. These snails live in the Yangtze River drainage and in the Mekong River drainage (1 species). Description. The length of the shell of this species is up to 3.9 mm. Species. Species within the genus "Erhaia" include: Synonyms: Ecology. "Erhaia" lives in streams in mountainous areas.