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.Wilke T., Davis G. M., Gong X. & Liu H.-X. (2000). "Erhaia (Gastropoda: Rissooidea): phylogenetic relationships and the question of Paragonimus coevolution in Asia". American Journal of Tropical Medicine and Hygiene 62(4): 453-459. , PDF.Wilke T., Davis G. M., Falniowski A., Giusti F., Bodon M. & Szarowska M. (2001). "Molecular systematics of Hydrobiidae (Mollusca: Gastropoda: Rissooidea): testing monophyly and phylogenetic relationships". Proceedings of the Academy of Natural Sciences of Philadelphia 151: 1-21 JSTOR.
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: Erhaia daliensis Davis & Kuo, 1985 Erhaia gongjianguoi (Kang, 1983) Erhaia hubiensis (Liu, Zhang & Wang, 1983) Erhaia jianouensis (Liu & Zhang, 1979) Erhaia kunmingensis Davis & Kuo, 1985 Erhaia lii (Kang) Erhaia nainitalensis Davis & Rao, 1997Davis G. M. & Rao S. (1997). "Discovery of Erhaia (Gastropoda: Pomatiopsidae) in northern India with description of a new genus of Erhaiini from China". Proceedings of the Academy of Natural Sciences of Philadelphia 48: 273-299. JSTOR. Erhaia robusta (Kang, 1986) Erhaia sheminensis Erhaia wangchuki Gittenberger, Sherub & Stelbrink, 2017 Erhaia wantanensis Erhaia wufengensis
Synonyms: Erhaia chinensis Davis et al. 1985 and Erhaia chinensis Davis & Kang, 1995Davis G. M. & Kang Z. B. (1995). "Advances in the Systematics of Erhaia (Gastropoda: Pomatiopsidae) from the People's Republic of China". Proceedings of the Academy of Natural Sciences of Philadelphia 146: 391-427. JSTOR. are synonyms of Chencuia chinensis Liu & Zhang, 1979
Ecology Erhaia lives in streams in mountainous areas.
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