Worms can also be referred to as helminths, especially in clinical terminology while relating to parasitic worms, in particular the nematoda (roundworms) and cestoda (tapeworms) which are living in the intestines of their host. Invertebrate animals typically called "worms" encompass annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms ("bootlace worms"), marine chaetognatha (arrow worms), priapulid worms, and bug larvae which includes grubs and maggots. Most animals known as "worms" are invertebrates, but the time period is likewise used for the amphibian caecilians and the slowworm anguis, a legless burrowing lizard. The name stems from the old english phrase wyrm. In biology, "worm" refers to an out of date taxon, vermes, utilized by carolus linnaeus and jean-baptiste lamarck for all non-arthropod invertebrate animals, now visible to be paraphyletic.
Loose-living malicious program species do no longer stay on land, but instead, stay in marine or freshwater environments, or underground by means of burrowing. Diverse kinds of malicious program occupy a small kind of parasitic niches, living within the our bodies of other animals. 7 metres (22 feet) for the african giant earthworm, microchaetus rappi, and fifty eight metres (190 toes) for the marine nemertean bug (bootlace worm), lineus longissimus. Three toes) in period for marine polychaete worms (bristle worms), 6. Worms vary in size from microscopic to over 1 metre (3. Worms are many extraordinary distantly associated animals that typically have an extended cylindrical tube-like frame, no limbs, and no eyes.
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