Dryopidae is a family of beetles, commonly named long-toed water beetles, in the superfamily Byrrhoidea. It was described by Billberg in 1820. Long-toed water beetles are named for their extended claws. Adults have dense hairs, which allow the beetles to breathe while underwater. The flight muscles of the females weaken as they age. When the pupae...
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http://en.wikipedia.org/wiki/Dryopidae
Dryopidae is a family of beetles of the order Coleoptera, divided into two groups or subfamilies: dryopids proper and elmids. They all have strikingly long limbs with two large claws. The beetles spend much of their time under water.
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http://www.probertencyclopaedia.com/browse/BD.HTM
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