by Niel Bruce and Alison MacDiarmid
Crustaceans are diverse – some are less than a millimetre long and others are over half a metre, there are lobsters and those shaped like worms, and some are thin discs and others are totally enclosed in shells. Belonging to the same group as insects, spiders, mites and scorpions, they are the bugs of the sea.
Main image: A squat lobster
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