What species is a lamprey?

Lampreys are jawless fish belonging to the order Petromyzontiformes. They are characterized by their elongated bodies, a toothed, funnel-shaped mouth, and a lack of paired fins. Lampreys are often found in freshwater and saltwater environments, where some species are parasitic, attaching to other fish to feed on their blood and tissues, while others are non-parasitic and have different life cycles.