Class Actinopterygii Woodward, 1891 - ray-finned fishes
   Subclass Neopterygii Regan, 1923
     Infraclass Teleostei Müller, 1845
       Supercohort Teleocephala de Pinna, 1996
         Clupeocephala
           Cohort Euteleosteomorpha (Greenwood et al., 1966)
             Subcohort Protacanthopterygii Greenwood et al., 1966
               Order Salmoniformes Rafinesque, 1810 - trouts
                 Suborder Osmeroidei
                   Superfamily Galaxioidea
                     Family Retropinnidae - New Zealand smelts
                       1 Genus Retropinna Gill, 1863