|The molluscs compose the large phylum of invertebrate animals known as the phylum Mollusca. Around 85,000 extant species of molluscs are recognized. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not only in size and in anatomical structure, but also in behaviour and in habitat.
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Opinions vary about the number of classes of molluscs, this table shows the three most "common" classes in collectors world
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Clams, oysters, scallops, geoducks, mussels...
Squid, octopus, cuttlefish, nautilus...
All the snails and slugs
including abalone, limpets, conch, nudibranchs, sea hares, sea butterfly...