These days, when someone talks about worms, we automatically think of viruses affecting our computer.

However, this large and diverse group of invertebrates is an important part of the Great Barrier Reef community, and is often involved in complex relationships with other marine creatures.

The term “worm” applies to a number of different phyla (groups), and they are grouped based on their individual structures. Nematode worms are covered in a flexible outer layer, similar in structure to our fingernails, and completely lack cilia for locomotion.

Annelid worms, on the other hand, have a more typical “worm” shape, with a segmented body and a distinct head. The classic Christmas tree or fanworm, is a great example.

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