Annelids are a large group of free-living worms. There are three primary sub-groups of annelids: - oligochaetes: worms with few hairs in both terrestrial and aquatic habitats, e.g. earthworms and Tubifex worms - polychaetes: worms with many hairs, found mainly in marine habitats - hirudinea: ectoparasitic and carnivorous species with few hairs, e.g. leeches |
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