Lamprey
Geotriidae
Mordaciidae
Petromyzontidae
† Mayomyzontidae
Lampreys (sometimes also called lamprey eels) are an order of jawless fish, the adults of which are characterized by a toothed, funnel-like sucking mouth. The common name "lamprey" is derived from lampetra, which translated from Latin means "stone licker" (lambere "to lick" + petra "stone").
While lampreys are well known for those species which bore into the flesh of other fish to suck their blood, most species of lamprey are not parasitic and never feed on other fish. The lampreys are a very ancient lineage of vertebrates, though their exact relationship to hagfishes and jawed vertebrates is still a matter of dispute.
Read more about Lamprey: Characteristics, Distribution, Life Cycle, Taxonomy and Systematics, As Food, As Pests, Folklore, In Literature