Petromyzontiformes
Agnathomyzon
Ammocaetes Berthold, 1827
Ammocetes Fleming, 1822
Ammocites Berthold, 1827
Ammocoetes Cuvier, 1817
Ammocoetus Duméril, 1812
Bathymyzon Gill, 1883
Batymyzon
Caragola
Caspiomyzon Berg, 1906
Chilopterus Philippi, 1858
Dionisia
Entospheneus
Eudontomyzon Regan, 1911
Exodomegas Gill, 1883
Exomegas Burmeister, 1868
Geotria Gray, 1851
Gilpichthys Bardack & Richardson, 1977
Haploglossa Gratzianow, 1907
Ichthyomyzon Girard, 1858
Lampetra Bonnaterre, 1788
Lampreda Rafinesque, 1815
Lethenteron Creaser & Hubbs, 1922
Macrophthalmia
Mesomyzon Chang, Zhang & Miao, 2006
Mordacia Gray, 1851
Myxinikela Bardack, 1991
Neomordacia
Oceanomyzon
Okkelbergia Creaser & Hubbs, 1922
Petromyzon Linnaeus, 1758
Pricus Rafinesque, 1815
Priscomyzon Gess, Coates & Rubidge, 2006
Reighardina Creaser & Hubbs, 1922
Scolecosoma Girard, 1858
Tetrapleurodon Creaser & Hubbs, 1922
Thysanochilus
Velasia