Dytiscidae


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Dytiscidae

[dī′tis·ə‚dē]
(invertebrate zoology)
The predacious diving beetles, a family of coleopteran insects in the suborder Adephaga.

Dytiscidae

 

(predacious diving beetles), a family of water beetles. The body is elongate-oval and flattened; less frequently it is convex. The beetles range in length from 1.5 to 50 mm. The oar-shaped hind legs are for swimming; the forelegs are prehensile. The elongated larvae have legs fitted for swimming, a large head, and sickle-shaped mandibles. The mandibles have ducts for sucking in prey.

Predacious diving beetles are widely distributed. Of the approximately 2,500 species, more than 270 are found in the USSR. The beetles live in fresh or, less frequently, brackish waters; they breathe air, which is stored under the elytra. At night the beetles often emerge from the water and fly. They pupate in soil near the water. The beetles and larvae are active predators and eat various aquatic invertebrates, including the larvae of mosquitoes. Large species, such as Dystiscus marginalis, even prey on tadpoles and young fish, thus sometimes adversely affecting the fishing industry.

References in periodicals archive ?
Familias: Haliplidae, Dytiscidae, Gyrinidae, Hydrophilidae y Staphylinidae.
The most diverse family across all GLR wetland ponds was Dytiscidae (Coleoptera), which was represented by 20 genera, followed by the family Libellulidae (Odonata) with 14 genera.
The large number of species exclusive to this sampling method were Lepidoptera (61 species) and aquatic beetles (26 species in the families: Dytiscidae, Gyrinidae, Haliplidae, and Hydrophilidae).
Haliplidae, Dytiscidae, Gyrinidae, Hydrophilidae, Heteroceridae, Parnidae, Georissidae, Cyathoceridae).
Of all these species, 4 were from Haliplidae, one species was from Noteridae, and 42 species were from Dytiscidae.
La clase Insecta estuvo representada por las abundancias mas altas con cuatro ordenes importantes, de los cuales los coleopteros tuvieron el mayor numero de taxones, con tres familias de escarabajos acuaticos: Hydrophilidae, Dytiscidae y Noterida; los odonatos, los dipteros y los hemipteros mostraron abundancias menores.
El trabajo hace enfasis en organismos de ambientes lenticos, listando especies de los ordenes Hemiptera (Heteroptera) y Coleoptera (fundamentalmente especies de las familias Dytiscidae e Hydrophilidae, ademas de Noteridae, Gyrinidae, Lutrochidae y Dryopidae en mucho menor medida) tipicos de este tipo de ambientes.
IVI CIPO LPAT LVEN Nematoda + + + + Oligochaeta + + + + Narapa bonettoi + + + - Hirudinea - + - + Thiaridae - + - + Corbiculidae + + - + Mytilidae - + - - Hydracarina + + + + Cladocera + + + + Ostracoda + + + + Calanoida + + + + Cyclopoida + + + + Entomobryidae + + + + Sminthuridae - - - + Polymitarcyidae + + + + Leptohyphidae + + - + Baetidae - + - + Gomphidae + + - + Coenagronidae - + - - Hydropsychidae + + - - Polycentropodidae + + - - Hydroptilidae - + - - Dytiscidae + - - + Hydrophilidae + - - - Elmidae + + - + Ceratopogonidae + + + + Chaoboridae - - + - Chironomidae + + + + Culicidae + - - - Tabela 1.
The family Dytiscidae is a model group for testing co-occurrence and exclusion mechanisms since numerous species of the family interact in isolated, aquatic habitats and are ubiquitous throughout landscapes.
10), por otro lado Elmidae (adulto), Dytiscidae (adulto) y Ceratopogonidae se presentaron con mayor abundancia en los sitios intermitentes que permanentes (test de Mann-Whitney, p<0.