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diving beetle

noun
1.
any of numerous predaceous water beetles of the family Dytiscidae, having the body adapted for swimming.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for diving beetle
  • Another likely predator is a blind species of the predaceous diving beetle family.
  • Above, right: diving beetle, a voracious lake predator.
British Dictionary definitions for diving beetle

diving beetle

noun
1.
any of the aquatic predatory beetles of the widely distributed family Dytiscidae, characterized by flattened hindlegs adapted for swimming and diving
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for diving beetle

any of more than 4,000 species of carnivorous, aquatic beetles (insect order Coleoptera) that prey on organisms ranging from other insects to fish larger than themselves. Diving beetles are oval and flat and range in length from 1.5 mm to more than 35 mm (0.06 to more than 1.4 inches). They are well adapted to an aquatic environment. The hind pair of legs is long, flattened, and fringed to provide surface area that aids in flotation and swimming. The spiracles (openings through which the beetle breathes) are on the abdomen just under the tips of the wing covers (elytra). When in a resting position, below the water surface on an incline with the head down, the beetle raises the tips of the elytra and breathes through the spiracles. When ready to dive, it stores a supply of air under its wings for breathing while under water. Diving beetles are so streamlined that the males of some species have sucker-like cups on the first pair of legs so that they can hold on to the smooth surface of the female during mating.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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