Home - Taxonomy - Geography - Biodiversity - Literature - Purchase RepFocus Recent updates Citation: Midtgaard, Rune. RepFocus - A Survey of the Reptiles of the World. (www.repfocus.dk). Latest update: July 4th, 2026. Taxonomy of the family Dipsadidae Bibliography of the genus Hydromorphus Biodiversity of the family Dipsadidae Genus Hydromorphus Central American Water Snakes Zentralamerikanische Wassernattern Centralamerikanske Vandsnoge 1859 Hydromorphus Peters (type species: Hydromorphus concolor Peters 1859) Contents: 2 species, of which 1 (50.0%) is endemic. Endemism: 0% 100% Distribution: Costa Rica, Guatemala, Honduras, Nicaragua, Panama. Meristic and other data of the world's snakes. Compiled by V. Wallach Key to abbreviations Head drawings of the genus Hydromorphus. Compiled by V. Wallach Hydromorphus concolor Common Central American Water Snake, Costa Rican Water Snake, Tropical Seep Snake Gewöhnliche Zentralamerikanische Wassernatter Almindelig Centralamerikansk Vandsnog 1859 Hydromorphus concolor Peters 1942 Hydromorphus clarki Dunn (Savage & Donnelly 1988) Distribution: Costa Rica, Guatemala, Honduras, Nicaragua, Panama. Hydromorphus dunni Panamanian Water Snake, (Dunn's Water Snake) Panamaische Wassernatter Panamansk Vandsnog 1942 Hydromorphus dunni Slevin Distribution: Panama.