Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Class Actinopterygii Woodward, 1891 - ray-finned fishes
       Order Cypriniformes Rafinesque, 1810 - carps
         Family Cyprinidae Rafinesque, 1815 - minnows and carps
           Genus Aaptosyax Rainboth, 1991
             Aaptosyax grypus Rainboth, 1991