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agnathansA jawless, heavily armored fish that appeared in the Devonian.
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agnathansthe "jawless fishes", a group that includes the modern hagfish and lamphrey. As their name suggests, they have no jaws. The skeleton is cartilaginous and they have no paired pectoral or pelv [..]
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agnathansA jawless, heavily armored fish that appeared in the Devonian
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