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单词 water beetle
释义

water beetle


water beetle

n. Any of various aquatic beetles, especially the diving beetles of the family Dytiscidae, having a smooth oval body and flattened and fringed hind legs used for swimming.

water beetle

n (Animals) any of various beetles of the families Dysticidae, Hydrophilidae, etc, that live most of the time in freshwater ponds, rivers, etc. See whirligig beetle

wa′ter bee`tle


n. any of various aquatic beetles, as a predaceous diving beetle of the family Dytiscidae. [1660–70]
Thesaurus
Noun1.water beetle - any of numerous aquatic beetles usually having a smooth oval body and flattened hind legs for swimmingwater beetle - any of numerous aquatic beetles usually having a smooth oval body and flattened hind legs for swimmingbeetle - insect having biting mouthparts and front wings modified to form horny covers overlying the membranous rear wingsDytiscidae, family Dytiscidae - water beetles

water beetle


water beetle,

name for aquatic beetlesbeetle,
common name for insects of the order Coleoptera, which, with more than 300,000 described species, is the largest of the insect orders. Beetles have chewing mouthparts and well-developed antennae.
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 of several families. They should not be confused with water bugswater bug,
name for a large number of water-living bugs, comprising several families of the order Hemiptera (true bugs). All have jointed, sharp, sucking beaks, breathe air, and undergo gradual metamorphosis (see insect).
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, which are true bugs (order Hemiptera). The predaceous diving beetles (family Dytiscidae) are a large group, widespread in quiet streams and ponds. They are black, brown, or greenish, .08 to 1.57 in. (3–40 mm) long, with smooth oval bodies and hairy, oarlike hind legs. There is a cavity beneath the wings for holding an air supply, so the diving beetle can remain submerged for long periods; however, the insect often hangs head down from the surface, exposing the openings (spiracles) of the last two of its breathing tubes, located at the tip of the abdomen. Both the adults and the long, conspicuously segmented larvae prey on a variety of animals, including snails and fish much larger than themselves. Adults of most species are strong fliers, and many are attracted to lights at night. The water scavenger beetles (family Hydrophilidae), of similar appearance, are abundant in marshy places in warm parts of the world and feed on water plants and decaying matter. Their larvae are predaceous. The whirligig beetles (family Gyrinidae) are oval, shiny, blue-black to dark brown beetles, about 3/4 in. (19 mm) long. They are found in groups in sheltered places, spinning around on the surface of the water. They feed on small insects on the surface and seldom dive. There are several other groups of water beetles, all classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, class Insecta, order Coleoptera.

water beetle


Related to water beetle: Water scavenger beetle
  • noun

Words related to water beetle

noun any of numerous aquatic beetles usually having a smooth oval body and flattened hind legs for swimming

Related Words

  • beetle
  • Dytiscidae
  • family Dytiscidae
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