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 ?
Heterelmis fue el genero de mas amplia distribucion con excepcion de dos estaciones de muestreo, seguido por Microcylloepus y Cylloepus que se reportaron en quince del total de las estaciones, mientras que Copelatus, Dryops, Berosus, Oulimnius y Scirtes solo fueron encontrados en uno de los 29 puntos de muestreo.
Finalmente, en los de rango estrecho se ubican un numero abundante de generos (once de los 27 registrados), entre los que se encuentran Andogyrus, Berosus, Tropisternus, Promoresia, Copelatus y Pseudodisersus (Tabla 4).
Abundancia * organismos Adephaga Dytiscidae Copelatus 2 (r) 0.
The objectives of this study are to describe the mature larva of Copelatus caelatipennis princeps, with an emphasis on chaetotaxy of thoracic appendages, and to assess the life cycle strategy and reproductive habitat requirements of this southeastern population.
Mature larvae of Copelatus were collected between 19 April and 4 May 1998 with triangular dip nets from three temporary roadside habitats (33[degrees] 14' 26"N, 83[degrees] 33' 10"W; 33[degrees] 14' 24"N, 83[degrees] 33' 27"W; 33[degrees] 13' 47"N, 83[degrees] 33' 04"W) in Jasper County, Georgia (Fig.
Mature larvae of Copelatus were present from 19 April through 4 May 1998 in three roadside woodland habitats where they were most frequently collected from within clumps of inundated terrestrial grasses.
Colymbetinae Colymbetini Rhantus signatus signatus (Fabricius) X Copelatinae Copelatini Copelatus alternatus Sharp X Copelatus longicornis Sharp X Dytiscinae Aciliini Thermonectus nobilis Zimmermann Thermonectus succinctus (Aube) Aubehydrini Notaticus fasciatus Cybistrini Megadytes laevigatus (Olivier) Megadytes latus (Fabricius) Hydaticini Hydaticus sp.
15) Copelatus Erichson Mandibulas con surco cerrado, sin denticulos robustos en el margen interno (Fig.
La subfamilia Copelatinae estuvo registrada por una especie no identificada de Copelatus, que fue recogida solamente en los arroyos de altura (Tabla I).
signatus (Fabricius) Copelatinae Copelatini Copelatus sp.
La subfamilia Copelatinae esta compuesta por tres generos en la Region Neotropical, de los cuales Copelatus Erichson es el unico presente en la Argentina.