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 Osteoglossoidea see Order Osteoglossiformes Berg, 1940
           156 Family Osteoglossidae Bonaparte, 1845 - bonytongues and arapaimas
           157 Family Arapaimidae Bonaparte, 1846
           158 Family Clupisudidae Jordan, 1923
           159 Family Pantodontidae Peters, 1876 [monotypic]