Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Superclass Agnatha Haeckel, 1895 see Class Agnatha Cope, 1889 Class Monorhina Haeckel, 1895 see Class Cephalaspidomorphi Kiaer & Stensiö, 1920 Subclass Hyperotreti see Order Myxiniformes