[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Pisces
     Class Osteichthyes Huxley, 1880 - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
       Order Perciformes Bleeker, 1859 - perches
         Family Istiophoridae Rafinesque, 1815 - billfishes and marlins
           Genus Tetrapturus Rafinesque, 1810
             1 Tetrapturus albidus Poey, 1860 - skilligalee
             2 Tetrapturus belone Rafinesque, 1810 - Mediterranean shortbill spearfish
             3 Tetrapturus georgii Lowe, 1841 - roundscale spearfish
             4 Tetrapturus pfluegeri Robins & de Sylva, 1963 - Atlantic longbill spearfish