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In older classifications, extant forms—that is, the lampreys and hagfishes— were grouped collectively as Cyclostomata (round mouth). It is now thought that the similarities between lampreys and hagfishes are primitive vertebrate features not essentially indicative of an in depth relationship. Lampreys share many similarities with jawed vertebrates (gnathostomes)—such as the flexibility to manage the ion focus within the physique, the nervous regulation of
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