What is "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.