Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Gasterosteiformes Gill, 1872 - sticklebacks
           1 Family Hypoptychidae - sand-eels
           2 Family Gasterosteidae Günther, 1859 - sticklebacks
           3 Family Aulorhynchidae - tubesnouts
           4 Family Indostomidae
           5 Family Pegasidae - seamoths