The sixgill stingray, Hexatrygon bickelli, is an unusual species of deep-sea ray. It is distinguished by its long, soft snout and six pairs of gill slits (all other rays have five). It is the sole member of the genus Hexatrygon and the family Hexatrygonidae. Although several species of Hexatrygon have been described historically, it is now believed that they may represent variations in a single, widespread species.
