Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
Count: [*†*] 3p;8c;66o;519f;3514g;510s;2ss; ‡3s; †1p;8c;86o;266f;698g;38s
   Phylum Chordata Bateson, 1885 - chordates
  Count: [*†*] 8c;66o;519f;3513g;510s;2ss; ‡3s; †7c;86o;265f;696g;38s
     Subphylum Craniata auct.
    Count: [*†*] 5c;62o;517f;3511g;510s;2ss; ‡3s; †7c;86o;265f;695g;38s
       Vertebrata Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
      Count: [*†*] 4c;61o;516f;3504g;505s;2ss; ‡3s; †7c;86o;265f;691g;36s
         Superclass Petromyzontomorphi [monotypic]
        Count: [*†*] 1c;1o;3f;10g;6s; †1f;2g;2s
           Class Petromyzontida [monotypic] - lampreys see Class Petromyzonti
          Count: [*†*] 1o;3f;10g;6s; †1f;2g;2s
             Order Petromyzontiformes Berg, 1940 - lampreys
            Count: [*†*] 3f;10g;6s; †1f;2g;2s
               Family Petromyzontidae Bonaparte, 1831, sedis mutabilis - lampreys
              Count: [*] 8g;5s
                 Subfamily Lampetrinae
                Count: [*] 6g;4s
                   Genus Lethenteron Creaser & Hubbs, 1922
                  Count: -