HydromorphusHydromorphus is a genus of snakes in the subfamily Dipsadinae.Geographic rangeThe genus Hydromorphus is endemic to Central America.SpeciesTwo species are recognized as being valid.Hydromorphus concolor - Costa Rica water snakeHydromorphus dunni - Dunn's water snakeEtymologyThe specific name, dunni, is in honor of American herpetologist Emmett Reid Dunn.