Nematode
Nematode species can be difficult to distinguish from one another. Estimates of the number of nematode. species described to date vary by author and may change rapidly over time. The word nematoda comes from the Modern Latin: ‘thread-like, of the nature of nature’
About Nematode in brief
The nematodes or roundworms constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a broad range of environments. Nematode species can be difficult to distinguish from one another. Estimates of the number of nematode. species described to date vary by author and may change rapidly over time. A 2013 survey of animal biodiversity published in the mega journal Zootaxa puts this figure at over 25,000. The roughly 2,271 genera are placed in 256 families. The many parasitic forms include pathogens in most plants and animals. A third of the genera occur as parasites of vertebrates; about 35 nematodes species occur in humans. In total, 4.4 × 1020 Nematodes inhabit the Earth’s topsoil, or approximately 60 billion for each human, with the highest densities observed in tundra and boreal forests. Their numerical dominance, often exceeding a million individuals per square meter and accounting for about 80% of all individual animals on earth. Their diversity of lifecycles, and their presence at various trophic levels point to an important role in many ecosystems. They have been shown to play crucial roles in polar ecosystems. The word nematoda comes from the Modern Latin Latin: ‘thread-like, of the nature of nature’. In 1758, some nematodas were included in the Linnaeus genera Vernaeus, Verneus, and Acantho.
Along with Nematomorpha, they came to be called Nematoidea, erroneously included with Trempho and Nematorpha. It was treated as a family by Burmeister, but it was later treated as Nematodales by von Acthorpe. The term is from Greek ntr. ntr. ‘Nematode,’ which means ‘worm’ or ‘parasite’, and is now used to refer to the entire phylum, not just the parasites of plants and other animals. It is also used as a name for the genus Nematoderma, which is a group of moulting animals in the clade Ecdysozoa, and has a tubular digestive system with openings at both ends. Like tardigrades they have a reduced number of Hox genes, but as their sister phylum has kept the ancestral protostome Hox genotype, it shows that the reduction has occurred within the nematODE phylum. They represent 90% of. all animals on the ocean floor. They are found in every part of the earth’s lithosphere, even at great depths, 0. 9–3. 6 km below the surface of the Earth in gold mines in South Africa. The number of species is estimated to be as low as 40,000 species. In short, if all the matter in the universe except the nem atodes were swept away, our world would still be dimly recognizable, and if, as disembodied spirits, we could then investigate it, we should find its mountains, hills, vales, rivers, lakes, and oceans.
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This page is based on the article Nematode published in Wikipedia (as of Nov. 29, 2020) and was automatically summarized using artificial intelligence.
