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Wild About Illinois Fishes!
Family Petromyzontidae - Lamprey Family
Family: Petromyzontidae - Lampreys have a skeleton made of cartilage and a long, tube-shaped body. They have seven gill openings on each side of the head. These animals lack pectoral and pelvic fins, have only one nostril and no jaws. Some lampreys do not feed as adults while others act as a parasite on fishes, attaching with their mouth and scraping flesh and fluids with the teeth on their tongue and oral disc. There are no scales on the body. A larval lamprey is known as an ammocoete.
chestnut lamprey (Ichthyomyzon castaneus)
northern brook lamprey (Ichthyomyzon fossor) [state endangered]
silver lamprey (Ichthyomyzon unicuspis)
least brook lamprey (Lampetra aepyptera) [state threatened]
American brook lamprey (Lethenteron appendix) [state threatened]
sea lamprey (Petromyzon marinus) [nonnative]