[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Pisces
     Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi
       Order Syngnathiiformes Bailly, Eschmeyer, Froese, Quéro, van der Land, Costello, Zavodnik, Serrão Santos & Mora Porteiro, 2001, orth. inval. see Order Syngnathiformes Berg, 1940
         Family Syngnathidae Günther, 1870 - pipefishes and seahorses
           Genus Hippocampus Rafinesque, 1810 - seahorse
             1 Hippocampus hippocampus (C. Linnaeus, 1758) - short-snouted seahorse
             2 Hippocampus ramulosus Leach, in Leach & Nodder, 1814 see Hippocampus guttulatus Cuvier, 1829