Chordata Bateson, 1885 - chordates
   Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758
     Subclass Actinopteri Cope, 1871 see [unranked] Actinopteri Cope, 1871
       Order Isospondyli Cope, 1887 see Order Osteoglossiformes Berg, 1940
         Suborder Clupeoidei Rafinesque, 1810
           Family Ancylostylidae [monotypic]
             Genus Ancylostylos Gorjanovic-Kramberger, 1895