
Harpacticoida is an order of copepods, in the subphylum Crustacea. This order comprises 463 genera and about 3,000 species; its members are benthic copepods found throughout the world in the marine environment (most families) and in fresh water (essentially the Ameiridae, Parastenocarididae and the Canthocamptidae). A few of them are planktonic or...
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http://en.wikipedia.org/wiki/Harpacticoida

(from the article `crustacean`) ...MormonilloidaAntennule with 3 or 4 long segments and long setae; fifth leg absent; marine.Order HarpacticoidaAntennules short; abdomen not ...
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http://www.britannica.com/eb/a-z/h/18

Harpacticoida A diverse order of typically free-living copepod crustaceans which are mainly epibenthic, burrowing or interstitial forms, occasionally planktonic or parasitic; characterized by the fusion of the inner branch (endopod) of the fifth leg to its base; feeding primarily on algae and a variety of microorganisms. It contains about 3,000 spe...
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http://www.wordinfo.info/words/index/info/view_unit/3439/
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