Lamarck started the process in 1793, when he labelled the Vermes une espèce de chaos (a kind of chaos) and divided them into three new phyla: worms, echinoderms, and polyps (which included corals and jellyfish). Since then, his Insecta (which included crustaceans and arachnids) and Vermes have been renamed or broken up, while his Insecta (which included crustaceans and arachnids) and Vermes have been renamed or broken up. The animals were grouped into three kingdoms in his initial concept, with Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia as the classes. Linnaeus published his Systema Naturae in 1758, which included the first hierarchical classification. In taxonomy, the term worm refers to an obsolete classification system called Vermes, which was used by Carl Linnaeus and Jean- Baptiste Lamarck to classify all non-arthropod invertebrates but is now considered polyphyletic. Lungworm is a parasitic worm that can be found in a variety of animal species, including fish and cats. When a person or animal is described to have worms, it signifies that it is infected with parasitic worms, most commonly roundworms or tapeworms. Worms are also referred to as helminths in medical terminology when they are parasitic worms that live in the intestines of their hosts, such as the Nematoda (roundworms) and Cestoda (tapeworms). Annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms ( bootlace worms), priapulid worms, and insect larvae such as grubs and maggots are examples of invertebrate organisms frequently referred to as worms. Invertebrates are most commonly referred to as worms, but the name is also applied to amphibians and the slowworm Anguis, a legless burrowing lizard.
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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