Family Petromyzontidae

Caspiomyzon - The Caspian lamprey, Caspiomyzon wagneri, is a species of lamprey native to the Caspian Sea.

Eudontomyzon - IUCN 2008 Red List - Eudontomyzon sp.

Geotria - It is a species of lamprey that occurs throughout much of the southern hemisphere.

Lampetra - Lampetra is a genus of fish in the Petromyzontidae family.

Lethenteron - Lethenteron is a genus of fish in the Petromyzontidae family.

Mordacia - Mordacia is the sole genus of the subfamily Mordacinae of the family Petromyzontidae.

Petromyzon - The life cycle of sea lampreys is anadromous, like that of salmon.