The word wyrm is derived from Old English. In biology, the term worm refers to the paraphyletic taxon vermes, which was used by Carolus Linnaeus and Jean-Baptiste Lamarck to describe all non-arthropod invertebrate animals. Free-living worms do not reside on land, preferring to live in marine or freshwater habitats or burrowing underground. Various varieties of worms live inside the bodies of other animals, occupying a small number of parasitic niches. Worms range in size from microscopic to over 1 metre (3.3 feet) in length for marine polychaete worms (bristle worms), 6.7 metres (22 feet) for the African giant earthworm, Microchaetus rappi, and 58 metres (190 feet) for the marine nemertean worm (bootlace worm), Lineus longissimus. ![]() ![]() ![]() Worms are bilateral animals with a long cylindrical tube-like body, no limbs, and no eyes that come in a variety of shapes and sizes (not always).
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