The gastrotrichs (phylum Gastrotricha), commonly referred to as hairybacks, are a group of microscopic (0.06-3.0 mm), worm-like, pseudocoelomate animals, and are widely distributed and abundant in freshwater and marine environments. They are mostly benthic and live within the periphyton, the layer of tiny organisms and detritus that is found on th...
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http://en.wikipedia.org/wiki/Gastrotrich
any of about 1,800 species of the class Gastrotricha, a group of microscopic aquatic invertebrates belonging to the phylum Aschelminthes. They occur ... [3 related articles]
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http://www.britannica.com/eb/a-z/g/12
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