Other invertebrate groups include:
Annelids are segmented worms with soft bodies. Most of the worm’s body consists of identical segments, giving it a ‘ringed’ appearance.
Nematodes are tiny, thin worms without segments. Many species are free-living but others are parasites that cause disease. For example, hookworms can infect humans.
Molluscs usually have a broad muscular foot and may also have a shell. Examples of molluscs include snails, slugs, squids and octopuses.