Genus Nerodia is a group of non-venomous water snakes that are mostly found in North America. These snakes have been assigned different synonyms over the years due to taxonomical reclassifications. Some of these synonyms include: Regina, Neroida, Amphiesma, and Natrix. Regina, which is derived from the Latin word for queen, was used because of the snakes' slender bodies and highly patterned scales. Neroida and Amphiesma were used to describe the snake's aquatic and semi-aquatic nature. Natrix was used because of the similarities in appearance to the common European grass snake. Despite changes in classification and nomenclature, the Genus Nerodia remains an important group of snakes that are essential to the ecosystems they inhabit.