living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
             Class Agnatha Cope, 1889
               Order Petromyzoniformes see Order Petromyzontiformes Berg, 1940
                 Family Petromyzonidae Bonaparte, 1831 see Family Petromyzontidae Bonaparte, 1831
                   Genus Petromyzon Linnaeus, 1758
                     Petromyzon marinus Linnaeus, 1758 - eel sucker