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lamprey
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Illustration of a Petromyzon, a jawless fish with an elongated, eel-like body and a rounded mouth, shown with a scale bar indicating 10 centimeters and 4 inches for size reference. lamprey sea lamprey: mouth lamprey
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Illustration of a Petromyzon, a jawless fish with an elongated, eel-like body and a rounded mouth, shown with a scale bar indicating 10 centimeters and 4 inches for size reference.
lamprey (Petromyzon) Ranging between 11 and 120 cm (4.3–47.2 inches) in length, sea lampreys are among the most primitive of all living vertebrates.

lamprey

agnathan vertebrate
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lamprey, any of about 43 species of primitive fishlike jawless vertebrates placed with hagfishes in the class Agnatha. Lampreys belong to the family Petromyzonidae. They live in coastal and fresh waters and are found in temperate regions around the world, except Africa. The eel-like, scaleless animals range from about 15 to 100 cm (6 to 40 inches) long. They have well-developed eyes, one or two dorsal fins, a tail fin, a single nostril on top...

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