British Insects: the families of Caddis flies (Trichoptera)


L. Watson and M. J. Dallwitz

Hydropsychidae Curtis

Adults. Antennae about as long as the fore-wings to considerably longer than the fore-wings; with an elongated first segment to with a short first segment. Ocelli absent. Maxillary palps 5 segmented; filiform, with cylindrical segments; the terminal segment flexible, multi-articulated, annulated and generally relatively elongated. The mesoscutum without warts.

The fore-wings 7–12 mm long; with a discoidal cell; apical forks 5 (i.e., 1, 2, 3, 4 and 5). The hind-wings similar in width to the fore-wings to wider than the fore-wings; with a median cell, or without a median cell; with a discoidal cell; apical forks 4 (1, 2, 3 and 5).

Front tibia 2 spurred. Middle tibia 2 spurred. Hind tibia 4 spurred.

Larvae. The larvae constructing fixed retreats of stones and vegetable dèbris; forming silken nets (the wide net constructed adjacent to the entrance of the shelter); campodeoid. The mesonotum sclerotized; entire. The metanotum sclerotized; entire, or divided longitudinally into two sclerites. Abdominal segment 1 without retractable papillae. The larva with the terminal abdominal prolegs free of one another.

Comments. If the larvae are mainly vegetarian (see Riek, 1970), the function of the net is unclear.

British representation. 10 species. Genera: Cheumatopsyche, Diplectrona, Hydropsyche.

Illustrations. • Hydropsyche fulvipes Curtis: B. Ent. 601. • Hydropsyche fulvipes Curtis: B. Ent. 601, legend+text. • Hydropsyche fulvipes Curtis: B. Ent. 601, text cont.. • Wings of assorted Trichoptera. • Hydropsyche: larva. • Diplectrona felix: Stephens VI, 1835 (as Aphelocheira flavomaculata).

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.’.