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agnathan
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lamprey 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. Vertebrate species counts Illustration of a Myxine, or hagfish, showing its long, slender, eel-like body with smooth skin. A scale bar below indicates length in centimeters and inches for size reference. A branching diagram shows the evolutionary relationships among fossil and modern jawless fishes (Agnatha), with illustrations of Petromyzon, Myxine, Pharyngolepis, Pteraspis, Hemicyclaspis, and Drepanaspis along a timeline from the Ordovician period to the present. phyletic family tree for fishes
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Dromedary camels (Camelus dromedarius). Animals, mammals.
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agnathan: Media

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Images

lamprey
Lamprey (Lampetra) on rainbow trout.
Oxford Scientific Films/Bruce Coleman Ltd.
lamprey (Petromyzon)
Ranging between 11 and 120 cm (4.3–47.2 inches) in length, sea lampreys are among...
Encyclopædia Britannica, Inc.
hagfish
Hagfish (Myxine).
Encyclopædia Britannica, Inc.
systematic division of Agnatha
Systematic division of fossil and recent Agnatha.
Encyclopædia Britannica, Inc.
phyletic family tree for fishes
Phyletic family tree for fishes.
Encyclopædia Britannica, Inc.

Interactives

Vertebrate species counts
Vertebrates are separated into several groups, with the bony fishes (Osteichthyes)...
Encyclopædia Britannica, Inc.
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