As the second largest phylum of invertebrate life, there are around 85,000 species of extant molluscs recognised. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. The phylum is divided into several classes although, as shown below, only a few of these are of particular relevance to the marine aquarist.

The thumbail images below represent portals into each of these different classes. Click or touch a thumbnail to investigate.

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