Fishes
   Class Cephalaspidomorphi Moy-Thomas & Mile, 1971
     Order Petromyzontiformes Berg, 1940 - lampreys
       Family Petromyzontidae Bonaparte, 1832 - lampreys
         Subfamily Petromyzontinae
           01 Genus Agnathomyzon Gracianow, 1907
           02 Genus Ammocoetus Duméril, 1812
           03 Genus Bathymyzon Gill, 1883
           04 Genus Caspiomyzon Berg, 1906
           05 Genus Entosphenus Gill, 1862
           06 Genus Eudontomyzon Regan, 1911
           07 Genus Haploglossa Gracianov, 1906
           08 Genus Ichthyomyzon Girard, 1858
           09 Genus Lampetra Gray, 1851 see Genus Lampetra Bonnaterre, 1788
           10 Genus Lampetra Bonnaterre, 1788
           11 Genus Lampreda Rafinesque, 1815, nom. nud.
           12 Genus Lethenteron Creaser & Hubbs, 1922
           13 Genus Oceanomyzon Fowler, 1908
           14 Genus Okkelbergia Creaser & Hubbs, 1922
           15 Genus Petromyzon Linnaeus, 1758
           16 Genus Pricus Rafinesque, 1815, nom. nud.
           17 Genus Reighardina Creaser & Hubbs, 1922
           18 Genus Scolecosoma Girard, 1858
           19 Genus Tetrapleurodon Creaser & Hubbs, 1922