Chordata Bateson, 1885 - chordates
   Class Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758
     Subclass Actinopteri Cope, 1871 see Class Actinopteri Cope, 1871
       Order Isospondyli Cope, 1887 see Order Osteoglossiformes Berg, 1940
         Suborder Osteoglossoidea see Order Osteoglossiformes Berg, 1940
           156 Family Osteoglossidae Bonaparte, 1845 - bonytongues
           157 Family Arapaimidae Bonaparte, 1846 - arapaimas
           158 Family Clupisudidae Jordan, 1923
           159 Family Pantodontidae Peters, 1876 [monotypic] - freshwater butterfly fishes