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The most primitive of all known representatives of the earliest fishes are probably the remarkable Pleuracanthida, the genera Pleuracanthus, Xenacanthus, Orthocanthus, etc. We find well-preserved remains of them in the Permian period. Among the extinct earlier sharks of the Tertiary period there were some twice as large as the biggest living fishes; Carcharodon was more than 100 feet long.
Ernst Heinrich Philipp August Haeckel - The Evolution of Man — Volume 2
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