clade Hypsogastropoda Erhaia is a genus of small to minute[3] 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.

[1] Erhaia (also within the tribe Erhaiini) was originally described as a genus within the Pomatiopsidae in 1985,[2] but Wilke et al. (2000, 2001) moved it to the Amnicolidae.

[4][5] The distribution of Erhaia includes southern China and India.

[6] The center of biodiversity of Erhaia in China is located in the provinces of Hunan, Hubei and Sichuan.