
1) Branchiopod 2) Branchiopod crustacean 3) Branchiopodan 4) Water flea
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https://www.crosswordclues.com/clue/daphnia
[subgenus] Daphnia is one of the three subgenera of the genus Daphnia, the others being Australodaphnia and Ctenodaphnia. A number of species inquirendae are also included in the subgenus: ...
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http://en.wikipedia.org/wiki/Daphnia_(subgenus)

• (n.) A genus of the genus Daphnia.
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http://thinkexist.com/dictionary/meaning/daphnia/

The water flea, common crustaceans found in freshwater lakes, ponds, and slow moving streams. Cultivated or collected in the wild as fish food.
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http://www.aquahobby.com/articles/e_glossary.php

well-known water flea (q.v.) genus.[1 related articles]
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http://www.britannica.com/eb/a-z/d/8

A cladoceran (zooplankton) genus that is very common in lake ecosystems and is often used as a test animal for toxicity bioassays.
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http://www.encyclo.co.uk/visitor-contributions.php
Daph'ni·a noun [ New Latin ]
(Zoology) A genus of the genus
Daphnia .
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http://www.encyclo.co.uk/webster/D/6

Daphnia is a genus of minute crustaceans belonging to the division Branchiopoda. They are the water-fleas. The best-known species is the Daphnia pulex, or 'branch-horned' water-flea, which is a favourite microscopic object. The head is prolonged into a snout, and is provided with a single, central, compound eye; it is also furnished with antennae, ...
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http://www.probertencyclopaedia.com/browse/BD.HTM

[
n] - minute freshwater crustacean having a round body enclosed in a transparent shell
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http://www.webdictionary.co.uk/definition.php?query=daphnia
noun minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae
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https://www.encyclo.co.uk/local/20974
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