water beetle

noun
any of various aquatic beetles, as a predaceous diving beetle.

Origin:
1660–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
water beetle
 
n
See whirligig beetle any of various beetles of the families Dysticidae, Hydrophilidae, etc, that live most of the time in freshwater ponds, rivers, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

water beetle

any of several thousand species of aquatic beetles (order Coleoptera), including members of the families Haliplidae (crawling water beetles), Amphizoidae (trout-stream beetles), Hygrobiidae (screech beetles), Gyrinidae (whirligig beetles), Noteridae (burrowing water beetles), Hydrophilidae (water scavenger beetles), Dryopidae (long-toed water beetles), and Dytiscidae (true water beetles, also known as diving beetles or predaceous diving beetles). For additional information on groups and species of water beetles, see predaceous diving beetle; water scavenger beetle; whirligig beetle.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Bored with mice and rabbits, she buys a fish tank and installs a water beetle, thinking she might find inspiration for a new work.
The round shape of the crawling water beetle makes it difficult for it to swim in fast water.
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