Order
Petromyzontiformes (Lampreys)
Entosphenus tridentatus. Photo: (c) spow9781, some rights reserved (CC BY-NC)
Lampreys (sometimes also called, inaccurately, lamprey eels) are any jawless fish of the order Petromyzontiformes, placed in the superclass Cyclostomata. The adult lamprey may be characterized by a toothed, funnel-like sucking mouth. The common name “lamprey” is probably derived from Latin lampetra, which may mean “stone licker” (lambere “to lick” + petra “stone”), though the etymology is uncertain.
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