Phylum Mollusca: soft bodied invertebrates, most with a calcium carbonate shell at some life stage, including snails, clams, octopuses and squid. A body plan distinct enough from every arthropod group above that it forms its own phylum rather than a class within one.
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1. Wikipedia: Mollusca
WikipediaMollusca, lead sectionQuote, Mollusca, lead section
Nearly all produce eggs, from which may emerge trochophore larvae, more complex veliger larvae, or miniature adults.
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