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Fact file

Molluscs Proper name: Phylum Mollusca (moll-us-cah)
Examples: Slugs, snails, cockles, mussels, octopus, squid

Numbers of species: About 98,000
Where they are found: In the oceans, in freshwater and on land

Description: Molluscs have soft bodies, and many have some type of shell. Snails have coiled shells, and cockles and mussels have a two-part shell - they are called bivalves. Some molluscs, like the octopus, do not have a shell.

Need to know: The octopus is supposed to be the most intelligent of all the invertebrates - it has very fast reactions, a large brain, and well developed eyes.

Find out more about molluscs
Find out more about fossil molluscs

Go back to the Tree of life to find out more about other living things.