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Annelids Temporal range: Cambrian – Recent | |
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Glycera sp. | |
Scientific classification | |
Kingdom: | |
Superphylum: | |
Phylum: | Annelida Lamarck, 1809 |
Classes and subclasses | |
Class Polychaeta (paraphyletic?) |
Annelids are a phylum of invertebrate worms. They are the segmented worms, with over 17,000 known species.
Well known species are earthworms and leeches. Annelids can be found in most wet environments. Some of these species are parasitic or mutualistic. This means they live together with (or inside) another organism. A mutualistic relationship is beneficial to both organisms. Their size varies from under a millimetre to about 3 metres. The largest known species is the seep tube worm (Lamellibrachia lymnesi), which is related to the giant tube worm.