Trichoptera

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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.

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

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1, early instar trichopteran larvae - 27; COLEOPTERA: Stenelmis sp.
In Missouri, trichopterans dominated the diet (LaVal & LaVal 1980).
The following 19 species are added to the list of Arkansas endemics: two fungi, three gastropods, one araneid, two opilionids, two pseudoscorpions, one diplopod, three collembolans, two trichopterans, one coleopteran, one dipteran, and one hymenopteran.
0 mm HCW) primarily ate Baetis tricaudatus Dodds and Ephemerella subvaria McDunnough nymphs, as well as chironomids and some trichopterans.
8%) were the second ranked prey taxa consumed by common shiner, whereas trichopterans (mainly leptocerids) (22.
Sculpin from 15% embedded streams consumed ephemeropterans, trichopterans, and lepidopterans while sculpin from 35% embedded streams consumed trichopterans and chironomids.
genera) of ephemeropterans (mayflies), plecopterans (stoneflies), and trichopterans (caddisflies) in the sample.
Ephemeropterans were second most abundant (30% occurrence, 13% by weight), followed by terrestrial insects (20%, 9%), and trichopterans (18%, 4%).
2004) and trichopterans (Fairchild and Holomuzki, 2005; Gall and Brodie, 2009) have been especially well-documented.
Finally, bats may have been unable to specialize on cicadas as they often have a patchy dispersion (Dybas and Davis, 1962; Dybas and Lloyd, 1974; Oberdorster and Grant, 2006); however, bats will occasionally specialize on patchy resources such as flying ants, termites, trichopterans, Asiatic oak weevils (Cyrtepistomus castaneus) and spotted cucumber beetles (Diabrotica undecimpunctata) (Agosta et al.
Food of the New Zealand trichopterans Hydrobiosis parumbripennis McFarlane and Hydropsyche colonica McLachlan.
After the 3 July sample, no single foods were as heavily eaten as the scarabaeids had been earlier, but the most important ones were green pentatomids, unidentified beetles, scarabaeid beetles and trichopteraris in early June; trichopterans, scarabaeids, green pentatomids, and carabids in late June; trichopterans and Carabidae in early July; and trichopterans, Diabrotica, ichneumonids, and scarabaeids in late July.