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
                     Division Teleostei Müller, 1845 see Infraclass Teleostei Müller, 1845
                       Elopocephala see Supercohort Teleocephala de Pinna, 1996
                         Clupeocephala
                           Subdivision Euteleostei Greenwood et al., 1966 [monophyletic?] see Cohort Euteleosteomorpha (Greenwood et al., 1966)
                             Superorder Protacanthopterygii Greenwood et al., 1966 see Subcohort Protacanthopterygii Greenwood et al., 1966
                               Order Argentiniformes Johnson & Patterson, 1996 - marine smelts
                                 Suborder Alepocephaloidei
                                   Family Alepocephalidae - slickheads
                                     Genus Xenodermichthys Günther, 1878