upright=1.2|thumb|Sea lamprey, Petromyzon marinusthumb|Mouth of a sea lamprey, [[Petromyzon marinus]] thumb|318x318px|Median plane|Median section of lamprey demonstrating internal anatomy thumb|Microscopic cross section through the pharynx of a larva from an unknown lamprey species
A lamprey is a jawless fish with a distinctive circular, sucker-like mouth lined with teeth that it uses to attach to and feed on other fish. Lampreys are scientifically important because they represent an ancient lineage of vertebrates and are studied to understand vertebrate evolution and development.
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upright=1.2|thumb|Sea lamprey, Petromyzon marinusthumb|Mouth of a sea lamprey, [[Petromyzon marinus]] thumb|318x318px|Median plane|Median section of lamprey demonstrating internal anatomy thumb|Microscopic cross section through the pharynx of a larva from an unknown lamprey species
Lampreys (sometimes inaccurately called lamprey eels) are a group of jawless fish composing the order Petromyzontiformes , sole order in the class Petromyzontida. The adult lamprey is characterized by a toothed, funnel-like, sucking mouth. The common name "lamprey" is probably derived from Latin , which may mean "stone licker" ( "to lick" + "stone"), though the etymology is uncertain. "Lamprey" is sometimes seen for the plural form.
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