Hyperoartia/Petromyzontida (Lampreys)
Order: Petromyzontiformes
Family: [Geotriidae (Pouched Lamprey)]
—No subordinate taxa
Family: [Mordaciidae (Southern Topeyed Lampreys)]
—No subordinate taxa
Family: Petromyzontidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Eudontomyzon sp. nov. 'Migratory' | - | Ukranian migratory lamprey | late 1800's | Ukraine | Extinct | Access |
| Lampetra minima | Bond & Kan, 1973 | Miller Lake lamprey | - | Miller Lake, Oregon, USA | Rediscovered | Access |
| Tetrapleurodon spadiceus | (Bean, 1887) | Chapala lamprey, Mexican lamprey | 1987 | Mexico | Missing | Access |