 It lives on black lava rock habitat near the waters of Sulphur Gay.The Islas Revillagigedo nightsnake is believed to be most closely related to populations of snakes from in the Sonora-Sinaloa state border area of mainland Mexico and Isla Santa Catalina in the Gulf of California.The Clarion nightsnake likely originated from the dispersal of an ancestor that traveled by sea from a river basin in Sonora to Clarion.