The term worm is made use of in daily language to explain several different distantly associated animals that normally have a long cylindrical tube-like physical body and also no legs. Numerous types of worm inhabit a tiny variety of parasitic niches, living inside the bodies of various other animals. Free-living worm species do not live on land, however as an alternative live in aquatic or freshwater atmospheres, or underground by burrowing.
In biology, "worm" refers to an out-of-date taxon (vermes) made use of by Carolus Linnaeus as well as Jean-Baptiste Lamarck for all non-arthropod invertebrate pets, and also stems from the Old English word wyrm. Many pets called "worms" are invertebrates, yet the term is additionally used for the amphibian caecilians and also the slow worm Anguis, a legless burrowing lizard. Invertebrate pets generally called "worms" include annelids (earthworms), nematodes (roundworms), platyhelminthes (flatworms), marine polychaete worms (bristle worms), aquatic nemertean worms ("bootlace worms"), marine Chaetognatha (arrowhead worms), priapulid worms, and insect larvae such as maggots and grubs.
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