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What is a daphnia?

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<p><em><strong>Daphnia</strong></em> are small, planktonic crustaceans, between 0.2 and 5&nbsp;mm in length. <em>Daphnia</em> are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas because of their saltatory swimming style (although fleas are insects and thus only very distantly related). They live in various aquatic environments ranging from acidic swamps to freshwater lakes, ponds, streams and rivers.</p>
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<h2>Contents</h2>
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<li class="toclevel-1"><span class="tocnumber">1</span> <span class="toctext">Biology</span></li>
<li class="toclevel-1"><span class="tocnumber">2</span> <span class="toctext">Reproduction</span></li>
<li class="toclevel-1"><span class="tocnumber">3</span> <span class="toctext">Lifespan</span></li>
<li class="toclevel-1"><span class="tocnumber">4</span> <span class="toctext">Uses</span></li>
<li class="toclevel-1"><span class="tocnumber">5</span> <span class="toctext">Ecology</span></li>
<li class="toclevel-1"><span class="tocnumber">6</span> <span class="toctext">External links</span></li>
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<h2><span class="mw-headline">Biology</span></h2>
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<div style="WIDTH: 182px" class="thumbinner"><img class="thumbimage" border="0" alt="" width="180" height="295" src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Daphnia.png/180px-Daphnia.png" width="180" height="295" />
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Anatomy of <em>Daphnia</em></div>
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<h2><span class="mw-headline">Reproduction</span></h2>
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<div style="WIDTH: 182px" class="thumbinner"><img class="thumbimage" border="0" alt="" width="180" height="147" src="http://upload.wikimedia.org/wikipedia/commons/thumb/5/52/Daphnid_GLERL_1.jpg/180px-Daphnid_GLERL_1.jpg" width="180" height="147" />
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Resting egg pouch (ephippium) and the juvenile Daphnid that just hatched from it.</div>
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<h2><span class="mw-headline">External links</span></h2>
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<li><a class="external text" title="http://daphnia.cgb.indiana.edu/" rel="nofollow" href="http://daphnia.cgb.indiana.edu/" rel="nofollow"><font color="#800080">Daphnia Genomics Consortium</font></a></li> <li><a class="external text" title="http://mblaquaculture.com/content/organisms/daphnids.php" rel="nofollow" href="http://mblaquaculture.com/content/organisms/daphnids.php" rel="nofollow"><font color="#0066cc">Daphnia Images and Information at MBL Aquaculture</font></a></li> <li><a class="external text" title="http://www.caudata.org/daphnia/#anatomy" rel="nofollow" href="http://www.caudata.org/daphnia/#anatomy" rel="nofollow"><font color="#0066cc">Daphnia: An Aquarist's Guide</font></a></li> <li><a class="external text" title="http://www.waterflea.org/" rel="nofollow" href="http://www.waterflea.org/" rel="nofollow"><font color="#0066cc">Waterflea.org: a Community resource for cladoceran biology</font></a></li>
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