Chordata Bateson, 1885 - chordates
   Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758
     Subclass Crossopterygii Huxley, 1861 see Infraclass Crossopterygii Huxley, 1861
       Order Rhipidistia (Cope, 1887) see [unranked] Rhipidistia Cope, 1887
         106 Family Lepidosirenidae Stirton, 1953 - South American lungfishes
         107 Family Protopteridae - African lungfishes
         93 Family †Holoptychidae see Family Holoptychiidae Owen, 1859
         94 Family †Megalichthyidae Hay, 1902