1. Subfamily Lampetrinae Fowler, 1958
   1. Genus Caspiomyzon Berg, 1906
   2. Genus Entosphenus Gill, 1862
   3. Genus Lampetra Bonnaterre, 1788
   4. Genus Lethenteron Creaser & Hubbs, 1922
2. Genus Occidentis Carim, Auringer, Docker, Renaud, Clemens, Blanchard, Parker & Young, 2024
3. Subfamily Petromyzontinae Bonaparte, 1831
   1. Genus Petromyzon Linnaeus, 1758
   2. Genus Agnathomyzon Gratzianov, 1907 accepted as Caspiomyzon Berg, 1906
   3. Genus Bathymyzon Gill, 1883 accepted as Petromyzon Linnaeus, 1758 (unaccepted > junior subjective synonym)
   4. Genus Batymyzon Gill, 1883 accepted as Bathymyzon Gill, 1883 accepted as Petromyzon Linnaeus, 1758 (unaccepted > misspelling - incorrect subsequent spelling)
4. Genus Entospheneus Gill, 1862 accepted as Entosphenus Gill, 1862 (unaccepted > misspelling - incorrect subsequent spelling)
5. Subfamily Geotriinae Gill, 1893 accepted as Geotriidae Gill, 1893 (unaccepted > superseded rank)
   1. Genus Dionisia Lahille, 1915 accepted as Geotria Gray, 1851
   2. Genus Exomegas Gill, 1883 accepted as Geotria Gray, 1851
   3. Genus Macrophthalmia Plate, 1897 accepted as Geotria Gray, 1851
   4. Genus Neomordacia Castelnau, 1872 accepted as Geotria Gray, 1851
   5. Genus Thysanochilus Philippi, 1857 accepted as Geotria Gray, 1851
   6. Genus Velasia Gray, 1851 accepted as Geotria Gray, 1851
   7. Genus Yarra Castelnau, 1872 accepted as Geotria Gray, 1851
6. Genus Oceanomyzon Fowler, 1908 accepted as Petromyzon Linnaeus, 1758 (unaccepted > junior subjective synonym)

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