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 Bonaparte, 1841 - South American lungfishes
         107 Family Protopteridae Peters, 1855 - African lungfishes
         93 Family †Holoptychidae see Family Holoptychiidae Giebel, 1847
         94 Family †Megalichthyidae Hay, 1902