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The nematodes ( / ˈnɛmətoʊdz / NEM-ə-tohdz or NEEM-; Greek: Νηματώδη; Latin: Nematoda ), roundworms or eelworms constitute the phylum Nematoda. [3] [4] They are a diverse animal phylum inhabiting a broad range of environments. Most species are free-living, feeding on microorganisms, but there are many that are parasitic. [3] .
May 30, 2024 · Nematodes are among the most abundant animals on Earth. They occur as parasites in animals and plants or as free-living forms in soil, fresh water, marine environments, and even such unusual places as vinegar. Learn more about nematodes, including the diseases they cause.
Otherwise known as roundworms, nematodes live as either free-living organisms in terrestrial and aquatic organisms or as parasites in plants and animals. Defining characteristics include a round, elongated, invertebrate body and measure anywhere from 0.1 millimeters to over 3 feet in some parasitic nematodes.
Jul 1, 2018 · What Are Nematodes? Often referred to as roundworms, nematodes are not closely related to true worms. They are multicellular insects with smooth, unsegmented bodies. The nematode species that...
Feb 3, 2015 · What is a Nematode? Iowa PBS. 120K subscribers. Subscribed. 996. 161K views 9 years ago. So, what is a nematode? Nematodes are animals, worms to be precise, and numerous ones at that. Experts...
Nematodes are simple roundworms. Colorless, unsegmented, and lacking appendages, nematodes may be free-living, predaceous, or parasitic. Many of the parasitic species cause important diseases of plants, animals, and humans. Other species are beneficial in attacking insect pests, mostly sterilizing or otherwise debilitating their hosts.
Nematodes have been reported from every continent on earth and occur in deserts, swamps, the oceans, the tropics and Antarctica. Usually nematodes are invisible to all but a few specialists because most are microscopic and transparent. How many nematodes are there?
Aug 29, 2023 · Commonly referred to as roundworms ( Ascaris lumbricoides ), whipworms ( Trichuris trichiura ), pinworms ( Enterobius vermicularis ), and hookworms ( Necator americanus, Ancylostoma duodenale, and A ceylanicum ), intestinal nematodes are complex, nonsegmented, multicellular worms that comprise more than a dozen species of soil-transmitted ...
Oct 7, 2013 · Approximately half of the world’s human population is infected with gastrointestinal nematodes: about 3.5 billion cases, of which 450 million, mostly children, are seriously ill. Approximately 8–15% of crop losses are attributed to nematodes worldwide, with a cost of at least $80 billion.
The body of a nematode is long and narrow, resembling a tiny thread in many cases, and this is the origin of the group's name. The word "nematode" comes from a Greek word nema that means "thread". The epidermis (skin) of a nematode is highly unusual; it is not composed of cells like other animals, but instead is a mass of cellular material and nuclei without separate membranes.
