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Worms vary in size from microscopic to over 1 metre (3.3 ft) in length for marine polychaete worms (bristle worms);[1] 6.7 metres (22 ft) for the African giant earthworm, Microchaetus rappi;[2] and 58 metres (190 ft) for the marine nemertean worm (bootlace worm), Lineus longissimus.[3] Various types of worm occupy a small variety of parasitic niches, living inside the bodies of other animals. Free-living worm species do not live on land but instead live in marine or freshwater environments or underground by burrowing.

In biology, "worm" refers to an obsolete taxon, Vermes, used by Carolus Linnaeus and Jean-Baptiste Lamarck for all non-arthropod invertebrate animals, now seen to be paraphyletic. The name stems from the Old English word wyrm. Most animals called "worms" are invertebrates, but the term is also used for the amphibian caecilians and the slowworm Anguis, a legless burrowing lizard. Invertebrate animals commonly called "worms" include annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms ("bootlace worms"), marine Chaetognatha (arrow worms), priapulid worms, and insect larvae such as grubs and maggots.

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In taxonomy, "worm" refers to an obsolete grouping, Vermes, used by Carl Linnaeus and Jean-Baptiste Lamarck for all non-arthropod invertebrate animals, now seen to be polyphyletic. In 1758, Linnaeus created the first hierarchical classification in his Systema Naturae.[4] In his original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then the last four have all been subsumed into a single phylum, the Chordata, while his Insecta (which included the crustaceans and arachnids) and Vermes have been renamed or broken up. The process was begun in 1793 by Lamarck, who called the Vermes une espce de chaos (a sort of chaos)[a] and split the group into three new phyla, worms, echinoderms, and polyps (which contained corals and jellyfish). By 1809, in his Philosophie Zoologique, Lamarck had created 9 phyla apart from vertebrates (where he still had 4 phyla: mammals, birds, reptiles, and fish) and molluscs, namely cirripedes, annelids, crustaceans, arachnids, insects, worms, radiates, polyps, and infusorians.[6] Chordates are remarkably wormlike by ancestry.[7]

In the 13th century, worms were recognized in Europe as part of the category of reptiles that consisted of a miscellany of egg-laying creatures, including "snakes, various fantastic monsters, lizards, assorted amphibians", as recorded by Vincent of Beauvais in his Mirror of Nature.[8] In everyday language, the term worm is also applied to various other living forms such as larvae, insects, millipedes, centipedes, shipworms (teredo worms), or even some vertebrates (creatures with a backbone) such as blindworms and caecilians. Worms include several groups. The three main phyla are:

Familiar worms include the earthworms, members of phylum Annelida. Other invertebrate groups may be called worms, especially colloquially. In particular, many unrelated insect larvae are called "worms", such as the railroad worm, woodworm, glowworm, bloodworm, butterworm, inchworm, mealworm, silkworm, and woolly bear worm.

Worms may also be called helminths, particularly in medical terminology when referring to parasitic worms, especially the Nematoda (roundworms) and Cestoda (tapeworms). Hence, "helminthology" is the study of parasitic worms. When a human or an animal, such as a dog or horse, is said to "have worms", it means that it is infested with parasitic worms, typically roundworms or tapeworms. Deworming is a method to kill off the worms that have infected a human or animal by giving anthelmintic drugs.

Lobopodians are an informal grouping of extinct panarthropods from the Cambrian to the Carboniferous that are often called worms or "worm-like animals" despite having had legs in the form of stubby lobopods. Likewise, the extant Onychophora are sometimes called velvet worms despite possessing stubby legs.

Jumping worms, are non-native, invasive earthworms first confirmed in Wisconsin in 2013. Native to eastern Asia, they present challenges to homeowners, gardeners and forest managers. Jumping worms get their name from their behavior. When disturbed, they thrash, spring into the air and can even shed their tails to escape.

Endemic to parts of Asia, jumping worms (Amynthas spp.) first arrived in North America sometime in the late 19th century, probably in imported plants and other horticultural and agricultural materials. Since then, jumping worms have become widespread across much of the northeast, southeast and midwestern U.S. In 2013, jumping worms were confirmed for the first time in the upper Midwest, at the University of Wisconsin-Madison Arboretum.

Surprisingly, all earthworms in Wisconsin are non-native. There have been no native earthworms in Wisconsin since the last glacier moved through the state thousands of years ago, scouring the landscape down to the bedrock. The familiar earthworms we see in our gardens and on our fishing hooks originated in Europe, brought here by settlers. Although all earthworms can harm landscapes and forests, jumping worms may pose a bigger threat than European worms.

Jumping worms can quickly transform soil into dry, granular pellets with a texture like discarded coffee grounds. This altered soil structure is often unaccommodating to ornamental and garden plants and inhospitable to many native plant species. In addition, they can deplete the soil of nutrients, impact soil organisms, and in many cases, invasive plants thrive where jumping worms live.

Unlike most other kinds of earthworms, jumping worms are parthenogenic - they self-fertilize and do not need mates to reproduce. Each new generation begins with the production of hardened egg capsules, known as cocoons, that overwinter in the soil to hatch the following spring. Jumping worm cocoons are resistant to cold and drought and are as tiny as mustard seeds. Since they greatly resemble small bits of dirt, they are hard to see and so are often unknowingly moved in soil, mulch, potted plants, etc.

All earthworms, not just jumping worms, can harm forests by changing the soil structure and forest floor vegetation. Their feeding can result in a loss of soil moisture, compacted soil, exposed roots, erosion and an increase of pathogens and non-native plants. The result is less diversity of native plants and animals in delicate forest ecosystems.

Unwelcome guests: Beware the emergence of dreaded jumping worms [exit DNR] by Kathy Stahl, co-chair of the Lower Chippewa Invasives Partnership. A well-written article first published in the Dunn county News on July 7, 2018.

There are many different types of intestinal worms, but the most common is threadworm (also called pinworm). Threadworm is a type of roundworm that is commonly found in preschool and school-aged children, however the whole family can become infected.

Jumping worms include three similar-looking species: Amynthas tokioensis, Amynthas agrestis, and Metaphire hilgendorfi, all of which are in the family Megascolecidae. Two or three species often occur in the same location.

Michigan Distribution: Jumping worms were first recorded in Michigan in 2008 in Oakland County. Numerous unverified reports suggest jumping worms could be widespread in the Lower Peninsula.

Local Concern: Individual worms can reproduce without a mate (parthenogenesis) and their populations can increase quickly. They consume large amounts of leaf litter, destroying this important organic layer while displacing or out-competing native species including insects, salamanders, ground nesting birds and other earthworms. As the worms consume organic matter, they change the composition of the soil, making it less favorable for natural fungi and bacteria as well as for plant growth. In forests, this could affect native plant regeneration. In lawns and gardens, this could mean harm to ornamental plantings and turf.

Means of Introduction or Spread: Jumping worms can be spread through infested mulch, compost, potted or balled and burlapped plants, transplanting, or through bait release. Community compost and mulch piles or any resources where soil or plant material comes from multiple locations have the potential to spread jumping worms.

A worm virus refers to a malicious program that replicates itself, automatically spreading through a network. In this definition of computer worms, the worm virus exploits vulnerabilities in your security software to steal sensitive information, install backdoors that can be used to access the system, corrupt files, and do other kinds of harm.

One of the best ways to get malware protection from computer viruses and worms is to use powerful security software. A strong antivirus product will be able to combat phishing, spyware, malware, Trojans, and other cyber threats.

Anytime you open an email you are not expecting, particularly from senders you do not know, check for suspicious attachments or links. They may contain worms or a command that automatically downloads a worm onto your computer.

If your operating system is up-to-date with the most recent version, you are more likely to be protected from worms and other malware. Manufacturers are constantly on the lookout for vulnerabilities, and they often release patches that address them in operating system updates.

Traditionally, worms have been raised for fishing bait as well as a protein and enzyme source for various products, including animal food and biodegradable cleansers. Worms have also been used to manage agricultural wastes such as dairy manure. They convert waste into worm manure (also known as worm castings), a nutrient-rich, biologically beneficial soil product.

Vermicomposting is the use of worms as a composting method to produce vermicompost. Vermiculture is worm farming for the production of worms. In recent years, worm farming has been practiced on both a small and large scale with three complementary goals in mind: waste diversion, vermicomposting, and vermiculture. ff782bc1db