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Encyclopedic overview
Agnatha, the jawless vertebrates was formerly a superclass of jawless fishes. Most species are prehistoric or extinct, however there are about 60 modern species in the Agnaths superclass, divided into two classes:
Class Myxini (family Myxinidae) - the hagfish
Excerpted from Wikipedia’s “Category:Agnatha” article, available under the CC BY-SA 4.0 licence.