Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Myopterygii - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade Teleostomi Bonaparte, 1836
               Euteleostomi - bony vertebrates
                 Class Actinopterygii Woodward, 1891 - ray-finned fishes
                   Subclass Neopterygii Regan, 1923
                     Halecomorphi Cope, 1872 see Division Halecomorphi Cope, 1872
                       Order †Parasemionotiformes Lehman, 1966 [monotypic]
                         Family †Parasemionotidae Stensiö, 1932
                           1 Genus †Parasemionotus Piveteau, 1929
                           2 Genus †Watsonulus Brough, 1939