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News Release 11-025
The Most Genes in an Animal? Tiny Crustacean Holds the Record
New "model organism" to help environmental health protection
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![a Daphnia or water flea.](/news/mmg/media/images/daphnia1_f.jpg)
The tiny water flea Daphnia has the most genes of any animal, some 31,000.
Credit: Paul Hebert, University of Guelph
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![Photo of a Daphnia, or water flea, with a clonal brood of offspring.](/news/mmg/media/images/daphnia2_f.jpg)
Daphnia, or water flea, with a clonal brood of offspring.
Credit: Paul Hebert, University of Guelph
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![the defensive helmet that helps protect Daphnia against predators.](/news/mmg/media/images/daphnia3_f1.jpg)
A defensive helmet helps protect Daphnia against predators.
Credit: Paul Hebert, University of Guelph
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![a Daphnia with mild defensive neckteeth.](/news/mmg/media/images/daphnia4_f.jpg)
Daphnia with mild defensive neckteeth; the teeth are used against predators.
Credit: Paul Hebert, University of Guelph
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![two juvenile Daphnia with and without defensive neckteeth.](/news/mmg/media/images/daphnia5_f.jpg)
Juvenile Daphnia with and without defensive neckteeth.
Credit: Christian Laforsch, Ludwig-Maximilians-Universitat, Munich
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![Cover of the February 4, 2011 issue of the journal Science.](/news/mmg/media/images/science_020411_f.jpg)
The researchers' findings are described in the February 4, 2011 issue of the journal Science.
Credit: Copyright AAAS 2011
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