Class Actinopterygii Woodward, 1891 - ray-finned fishes
   Subclass Neopterygii Regan, 1923
     Infraclass Teleostei Müller, 1845
       Supercohort Teleocephala de Pinna, 1996
         Cohort Osteoglossomorpha Greenwood et al., 1966
           Order Osteoglossiformes Berg, 1940 - bonytongues
             1 Family †Ostariostomatidae Schaeffer, 1949
             2.1 Family Mormyridae Bonaparte, 1831 - elephantfishes
             2.2 Family Notopteridae Bleeker, 1851 - knifefishes
             2.3 Family Osteoglossidae Bonaparte, 1845 - bonytongues and arapaimas