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
             Family Osteoglossidae Bonaparte, 1845 - bonytongues and arapaimas
               1 Genus Heterotis Rüppell, 1828
               2 Genus Arapaima Müller, 1843