British Insects: the families of Caddis flies (Trichoptera)


L. Watson and M. J. Dallwitz

Rhyacophilidae Stephens

Adults. Antennae much shorter than the fore-wings to about as long as the fore-wings; slender; with a short first segment. Ocelli present. Maxillary palps 5 segmented; filiform, with cylindrical segments; the terminal segment inflexible, not multi-articulated, not annulated, and not much elongated.

The fore-wings (8–)10–15(–16) mm long; without a discoidal cell; apical forks 5 (i.e., with 1, 2, 3, 4 and 5). The hind-wings similar in width to the fore-wings; without a discoidal cell; apical forks 4 (with 1, 2, 3 and 5).

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

Larvae. The larvae case-less and free swimming; not net-forming; campodeoid. The labrum sclerotized. The anterior margin of the pronotum sclerotized, but only lightly so. The mesonotum entirely membranous. The metanotum entirely membranous. Abdominal segment 1 without retractable papillae. The larva with the terminal abdominal prolegs free of one another.

British representation. 4 species. Genera: Rhyacophila.

Illustrations. • Wings of assorted Trichoptera. • Rhyacophila sp.: larva.

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.’.