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What does it mean when cyclostomata are ectoparasites of other vertebrates?

Answer»

Agnatha (GREEK, "no jaws") is a superclass of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct (conodonts and ostracoderms) species. The group is sister to all VERTEBRATES with jaws, KNOWN as gnathostomes. ... There is no PARENTAL care in the Agnatha CLASS.



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