n = 44
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Petromyzon acutidens | Philippi, 1865 | Mordacia lapicida | Mordaciidae | Chilean lamprey |
| Petromyzon americanus | Lesueur, 1818 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon anwandteri | Philippi, 1863 | Mordacia lapicida | Mordaciidae | Chilean lamprey |
| Petromyzon appendix | DeKay, 1842 | Lethenteron appendix | Petromyzontidae | American brook lamprey |
| Petromyzon argenteus | Bloch, 1795 | Lampetra fluviatilis | Petromyzontidae | River lamprey |
| Petromyzon ayresii | Günther, 1870 | Lampetra ayresii | Petromyzontidae | Western river lamprey |
| Petromyzon bairdii | Gill, 1883 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon bdellium | Jordan, 1885 | Ichthyomyzon bdellium | Petromyzontidae | Ohio lamprey |
| Petromyzon bicolor | Shaw, 1804 | Lampetra planeri | Petromyzontidae | European brook lamprey |
| Petromyzon borealis | Girard, 1858 | Lethenteron camtschaticum | Petromyzontidae | Arctic lamprey |
| Petromyzon branchialis | Linnaeus, 1758 | Lampetra fluviatilis | Petromyzontidae | River lamprey |
| Petromyzon ciliatus | Ayres, 1855 | Entosphenus tridentatus | Petromyzontidae | Pacific lamprey |
| Petromyzon cirrhatus | Forster, 1801 | Eptatretus cirrhatus | Myxinidae | Broadgilled hagfish |
| Petromyzon danfordi | (Regan, 1911) | Eudontomyzon danfordi | Petromyzontidae | Carpathian lamprey |
| Petromyzon dentex | Anikin, 1905 | Lethenteron camtschaticum | Petromyzontidae | Arctic lamprey |
| Petromyzon epihexodon | (Gill, 1862) | Entosphenus tridentatus | Petromyzontidae | Pacific lamprey |
| Petromyzon ernstii | Dybowski, 1872 | Lethenteron camtschaticum | Petromyzontidae | Arctic lamprey |
| Petromyzon fluviatilis | Linnaeus, 1758 | Lampetra fluviatilis | Petromyzontidae | River lamprey |
| Petromyzon fluviatilis larvalis | Smitt, 1895 | Lampetra planeri | Petromyzontidae | European brook lamprey |
| Petromyzon fonki | Philippi, 1865 | Geotria australis | Geotriidae | Pouched lamprey |
| Petromyzon japonicus | Martens, 1868 | Lethenteron camtschaticum | Petromyzontidae | Arctic lamprey |
| Petromyzon jurae | MacCulloch, 1819 | Lampetra fluviatilis | Petromyzontidae | River lamprey |
| Petromyzon kessleri | Anikin, 1905 | Lethenteron kessleri | Petromyzontidae | Siberian brook lamprey |
| Petromyzon lampetra | Pallas, 1814 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon lividus | Girard, 1858 | Entosphenus tridentatus | Petromyzontidae | Pacific lamprey |
| Petromyzon lumbricalis | Pallas, 1814 | Lethenteron camtschaticum | Petromyzontidae | Arctic lamprey |
| Petromyzon macrostomus | Burmeister, 1868 | Geotria macrostoma | Geotriidae | |
| Petromyzon maculosus | Gronow, 1854 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon marinus | Linnaeus, 1758 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon marinus camtschaticus | Tilesius, 1811 | Lethenteron camtschaticum | Petromyzontidae | Arctic lamprey |
| Petromyzon marinus dorsatus | Wilder, 1883 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon marinus unicolor | Gage, 1928 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon mordax | Richardson, 1846 | Mordacia mordax | Mordaciidae | Shorthead lamprey |
| Petromyzon niger | Lacepède, 1802 | Lampetra planeri | Petromyzontidae | European brook lamprey |
| Petromyzon nigricans | Lesueur, 1818 | Petromyzon marinus | Petromyzontidae | Sea lamprey |
| Petromyzon omalii | Beneden, 1857 | Lampetra fluviatilis | Petromyzontidae | River lamprey |
| Petromyzon onki | Philippi, 1865 | Geotria australis | Geotriidae | Pouched lamprey |
| Petromyzon planeri | Bloch, 1784 | Lampetra planeri | Petromyzontidae | European brook lamprey |
| Petromyzon plumbeus | Shaw, 1804 | Lampetra planeri | Petromyzontidae | European brook lamprey |
| Petromyzon reissneri | Dybowski, 1869 | Lethenteron reissneri | Petromyzontidae | Far Eastern brook lamprey |
| Petromyzon sanguisuga | Lacepède, 1800 | Lampetra fluviatilis | Petromyzontidae | River lamprey |
| Petromyzon septoeuil | Lacepède, 1802 | Lampetra planeri | Petromyzontidae | European brook lamprey |
| Petromyzon tridentatus | Richardson, 1836 | Entosphenus tridentatus | Petromyzontidae | Pacific lamprey |
| Petromyzon wagneri | Kessler, 1870 | Caspiomyzon wagneri | Petromyzontidae | Caspian lamprey |