7. Nematodes STT2043.pptx - Scientific classification...

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Scientific classification Kingdom: Animalia Subkingdom: Eumetazoa (unranked): Bilateria Phylum: Nematoda Diesing , 1861
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The nematodes (pronounced nɛmətoʊdz / ) or roundworms ( phylum Nematoda) are the most diverse phylum of pseudocoelomates , and one of the most diverse of all animals . Nematode species are very difficult to distinguish; over 28,000 have been described, [1] of which over 16,000 are parasitic . It has been estimated that the total number of nematode species might be approximately 1,000,000. [2] Unlike cnidarians or flatworms , roundworms have a digestive system that is like a tube with openings at both ends.
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NEMATODES Nematodes are small, slender, colourless, round-worms of the Phylum: Nemathelminthes; Class: Nematoda. About 17,000 species are konown to man, but only a fraction of these have been identified as parasites either of plants, insects or other animals and man. Parasitic nematodes are usually shorter than 2 mm in length (average 1 mm). Nematodes are present in water and on land; practically every cubic centimeter of arable soil on Earth contains between 20 to 50 nematodes. Some species can survive in dry conditions for a considerable time, but to be active they need moisture. They either live on plant roots as ecto-parasites or enter plant tissues via the roots abnd become endo-parasites in roots, leaves or stems.
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They reproduce inside plant tissue. Ecto-parasites (and some endo- parasites) retain their slender body and mobility throughout life.
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