Trichoptera


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Related to Trichoptera: Plecoptera, Ephemeroptera, Raphidioptera

Trichoptera

[trə′käp·tə·rə]
(invertebrate zoology)
The caddis flies, an aquatic order of the class Insecta; larvae are wormlike and adults have two pairs of well-veined hairy wings, long antennae, and mouthparts capable of lapping only liquids.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Trichoptera

 

(caddis flies), an order of aquatic insects that undergo complete metamorphosis. Caddis flies have two pairs of wings with reduced venation, one pair of filiform antennae, and poorly developed mouth organs. The body and wings are covered with hairs; the coloration is brown or yellowish brown. The body length is 1.5–25 mm, and the wingspread is 5–70 mm. Of the approximately 5,500 species of caddis flies, about 600 are found in the USSR.

Caddis flies have an interesting life cycle. Annular, cylindrical, or discoid gelatinous egg-clutches are deposited on underwater plants and rocks. After hatching, the larvae move about the bottom and soon start feeding and constructing cases or snaring nets. They molt four to six times. The campodeiform larvae of the suborder Annulipalpia have flattened abdomens and deep strangulations between body segments. The majority, mostly predators, live freely without cases; they construct snaring nets (Polycentropus), funnels (Neureclipsis), or chambers (Hydropsyche). The caterpillar-like larvae of the suborder Integ-ripalpia have cylindrical abdomens and superficial strangulations between body segments. They live in cases made from mineral or vegetable particles; the cases are in the form of tubes or, less frequently, little caverns.

Before pupation, the larvae of all species of caddis flies build themselves a case with openings for water circulation. At first the pupa lives in the case, but later it gnaws through the top with its mandibles and swims to the surface. It swims by mean of its second pair of long legs. The pupa finally crawls out of the water and is transformed into the adult fly.

The larvae of caddis flies live in the clear waters of lakes, rivers, and streams. Hence, they serve as indicators of water quality. Adults stay near the water, amid vegetation. The larvae are important as food for whitefish, grayling, European bream, tench, Eurasian perch, ides, and other fishes that feed on benthos.

REFERENCES

Martynov, A. V. “Rucheiniki.” In Prakticheskaia entomologiia, fasc. 5. Leningrad, 1924.
Lepneva, S. G. Lichinki i kukolki podotriada kol’chatoshchupikovykh. Moscow-Leningrad, 1964. (Fauna SSSR: Rucheiniki, vol. 2, fasc. 1.)
Lepneva, S. G. Lichinki i kukolki podotriada tsel’noshchupikovykh. Moscow-Leningrad, 1966. (Fauna SSSR: Rucheiniki, vol. 2, fasc. 2.)
Kachalova, O. L. Rucheiniki rek Latvii. Riga, 1972.

O. L. KACHALOVA

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Rasmussen, Species diversity and ecology of Trichoptera (Caddisflies) and Plecoptera (Stoneflies) in Ravine ecosystems of Northern Florida [Ph.D.
After rearrangement of sites to groups according to differentiating environmental descriptors (control, HPP dam, below HPP dam), statistically significant differences were found in NT, EPT taxa number, H', total abundance of macroinvertebrates (ind.[m.sup.-2]) and relative (%) abundance of Plecoptera, Trichoptera EPT, Chironomidae and Oligochaeta in the Virvyte River (Figs 5, 3; Table 4).
En la Figura 6, se puede observar que en la temporada humeda los items alimenticios Coleoptera indeterminados, Trichoptera indeterminados, Diptera indeterminados, Hydrobiosidae, Hydroptilidae, Hydropsychidae, Baetidae, Simuliidae y Leptohyphidae, se encuentran como items de consumo raro, donde su composicion por numero es mas importante (aun siendo baja) que su composicion por peso.
8: Insecta II (Hemiptera, Me galoptra, Neuroptera, Trichoptera and Lepidoptera).
In addition to this, Uvarov (1940) states that Ernodes Redtenbacher,1908 is preoccupied by Ernodes Wallegren, 1891 (Trichoptera).
Baldock BM: Peritrich ciliates epizoic on larvae of Brachycentrus subnubilus (Trichoptera): importance in relation to the total protozoan population in streams.
Their prey included various insects including Trichoptera, Coleoptera, and Ensifera.
The EPT/chironomid metric is calculated as a ratio of the aquatic insect larval groups Ephemeroptera, Plecoptera, and Trichoptera (indicators of good water quality), and the dipteran larvae of the family Chironomidae (indicators of poor water quality).