Among marine Mesozoic reptiles, each of the groups broadly known as ichthyosaurs, plesiosaurs, mosasaurs and crocodiles were polyphyletic in a marked degree. [Please select]
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_, 102, 156, 255 Plesiosaurs (plē’ zi ō sawrz), i, 40, 45, 50 Pliny, the elder, i, 186; the younger, i, 535, ii, 38 Pliocene (plī’ ō sēn) Age, i, 52, 58, 60, 68 _sq. [Please select]
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For a time the armor-clad fishes held undisputed sway; then their reign was ended by the coming of the sharks, who in their turn gave way to the fish-lizards, the Ichthyosaurs and Plesiosaurs. [Please select]
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