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[daf-nee-uh] /ˈdæf ni ə/
a genus of tiny, freshwater crustaceans having a transparent body, used in biological research and as food for tropical fish.
Compare water flea.
Origin of Daphnia
1840-50; < New Latin, perhaps after Daphne; see -ia Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for Daphnia
Historical Examples
  • Wolfgang Ostwald has produced experimentally, through variation of temperature, dimorphism of form in Daphnia.

  • Such small creatures as Daphnia pulex, Cyclops quadricornis and Rotifera should be introduced into ponds.

    Amateur Fish Culture Charles Edward Walker
  • Both Daphnia and Cyclops are bred in stagnant water in which there should be a good stock of weeds.

    Amateur Fish Culture Charles Edward Walker
  • Daphnia must be reared in a stagnant pond, the fresh-water shrimp (Gammarus pulex) in running water, with plenty of weeds.

    Amateur Fish Culture Charles Edward Walker
  • Some of these belong to the genus Daphnia, and differ from the species found in other situations by their glassy transparency.

    The Life of Crustacea William Thomas Calman
  • Of Crustaceae: near the sea-shore a Pagurus existed in astonishing numbers, and in the sweet waters a Daphnia.

    The Highlands of Ethiopia William Cornwallis Harris
  • The recovery or death of the Daphnia depends therefore on the issue of the struggle.

  • I have already spoken of the fresh-water shrimp and the water-flea (Daphnia pulex).

    Amateur Fish Culture Charles Edward Walker
  • The water-flea, Daphnia (a crustacean), lays two kinds of eggs known as “summer” and “winter” eggs.

British Dictionary definitions for Daphnia


any water flea of the genus Daphnia, having a rounded body enclosed in a transparent shell and bearing branched swimming antennae
Word Origin
C19: from New Latin, probably from Daphne
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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