British Insects: the families of Caddis flies (Trichoptera)

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L. Watson and M. J. Dallwitz

Polycentropidae Ulmer

Adults. Antennae much shorter than the fore-wings to about as long as the fore-wings; stout. Ocelli absent. Maxillary palps 5 segmented; filiform, with cylindrical segments; the terminal segment flexible, multi-articulated, annulated and generally relatively elongated. The mesoscutum with a pair of warts.

The fore-wings 6–13 mm long; with a median cell; with a discoidal cell (this small); apical forks 4 (Cyrnus lacking no. 1), or 5 (mostly with all five present). The hind-wings similar in width to the fore-wings; without a median cell; with a discoidal cell, or without a discoidal cell; apical forks 2 (forks 2 and five only, in Holocentropus and Cyrnus), or 3 (1, 2 and 5, in Plectrocnemia and Polycentropus), or 4 (1, 2, 3 and 5 in Neureclipsis).

Front tibia 3 spurred. Middle tibia 4 spurred. Hind tibia 4 spurred.

Larvae. The larvae case-less and free swimming; forming silken nets; campodeoid. The labrum sclerotized. The anterior margin of the pronotum sclerotized, but only lightly so. The mesonotum entirely membranous. The metanotum entirely membranous.

Comments. The larvae greenish.

British representation. 13 species. Genera: Cyrnus, Holocentropus, Neureclipsis, Plectrocnemia, Polycentropus.

Illustrations. • Wings of assorted Trichoptera. • Plectronemia and Holocentropus: larvae.


To view the illustrations with detailed captions, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. British insects: the families of Caddis flies (Trichoptera). Version: 29th December 2011. http://delta-intkey.com’.

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