Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801 Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838 Order †Symmoriida Zangerl, 1981 see Order Symmoriiformes Zangerl, 1981 Genus †"Stethacantus" see Genus Stethacanthus Newberry, 1890