Hydrodynastes is a small genus of large colubrid snakes in the subfamily Dipsadinae. The genus is endemic to South America.Freiberg M (1982). Snakes of South America Hong Kong: T.F.H. Publications. 189 pp. . (Hydrodynastes, pp. 78-79, 99, 132-133 + photographs on pp. 5, 47, 50).
Species Two species are recognized:
Hydrodynastes bicinctus (Herrmann, 1804) Hydrodynastes gigas (A.M.C. Duméril, Bibron & A.H.A. Duméril, 1854)
References
Further reading Fitzinger L (1843). Systema Reptilium, Fasciculus Primus, Amblyglossae. Vienna: Braumüller & Seidel. 106 pp. + indices. (Genus Hydrodynastes, new genus, p. 25). (in Latin). Franco FL, Fernandes DS, Bentim BM (2007). "A new species of Hydrodynastes Fitzinger, 1843 from central Brazil (Serpentes: Colubridae: Xenodontidae)". Zootaxa 1613: 57–65. (Hydrodynastes melanogigas, new species).