Chordata Bateson, 1885 - chordates
   Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758
     Subclass Actinopteri Cope, 1871 see Class Actinopteri Cope, 1871
       Superorder Ganoidei (Agassiz)
         Order Halecomorphi Cope, 1872 see Division Halecomorphi Cope, 1872
           Family †Pachycormidae Lydekker, 1889, "nom. praeval."