Sierra garter snake, Couch's garter snake, western aquatic garter snake (Thamnophis couchii)

Thamnophis couchii is a species in the Thamnophis genus. It is commonly known as Sierra garter snake, Couch's garter snake, western aquatic garter snake This name is unplaced name for the species in the family Colubridae subfamily Natricinae, . . This species is found in California and Oregon in the United States.