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aschelminth in Science
Any of various, mostly microscopic wormlike invertebrates of the group Aschelminthes, including the nematodes, rotifers, and gastrotrichs. Aschelminths typically inhabit water or moist soil, are often parasitic, and have complex internal structures. The status of the Aschelminthes as a single taxonomic group is controversial, and many researchers consider its members to be separate phyla.
The American Heritage® Science Dictionary
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Encyclopedia Article for aschelminth

phylum of wormlike invertebrates, mostly of microscopic size. The phylum includes five diverse classes: Nematoda (or Nemata), Rotifera, Gastrotricha, Kinorhyncha (or Echinodera), and Nematomorpha. The American zoologist Libbie H. Hyman, in her classic textbooks on the invertebrates, originally included Priapulida as a class of the aschelminths, but Priapulida are usually not now included.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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