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Gastropods

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310 million years ago, gastropods, including drilling univalves, periwinkles, and snails, were present in the ancient seas, while bivalve gastropods like mussels, clams, oysters, and scallops have remained almost unchanged. 59:2.12

290 million years ago, gastropods, brachiopods, sponges, and reef-building corals continued to increase, with warm seas bathing the polar coasts. 59:3.7

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