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Definition of NEMATHELMINTHES
in some classifications: a phylum including the nematodes and horsehair worms and sometimes the acanthocephalans, rotifers, gastrotrichs, and minute marine organisms of a related class (Kinorhyncha) which are all more or less wormlike animals with a cylindrical unsegmented body covered by an ectoderm without cilia that secretes an external cuticle
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