Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Pisces Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes Order Myliobatiformes Compagno, 1973 - stingrays Family Hexatrygonidae Heemstra & Smith, 1980 - sixgill stingrays