British Insects: the families of Caddis flies (Trichoptera)

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L. Watson and M. J. Dallwitz

Philopotamidae Wallengr.

Adults. Antennae with a short first segment. Ocelli present. Maxillary palps 5 segmented. The maxillary palps of males 5 segmented. Maxillary palps filiform, with cylindrical segments; the terminal segment flexible, multi-articulated, annulated and generally relatively elongated (Chimarra marginata), or inflexible, not multi-articulated, not annulated, and not much elongated (?). The mesoscutum without warts.

The fore-wings 6–11 mm long; with a discoidal cell; apical forks 5 (i.e., with forks 1, 2, 3, 4 and 5). The hind-wings similar in width to the fore-wings; with a discoidal cell; apical forks 4 (forks 1, 2, 3 and 5).

Front tibia 1 spurred, or 2 spurred. Middle tibia 4 spurred. Hind tibia 4 spurred.

Larvae. The larvae constructing fixed, silken tubes, or case-less and free swimming; forming silken nets; campodeoid. The labrum not 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.

Comments. The larvae whitish with a chestnut-coloured head.

British representation. 5 species. Genera: Chimarra, Philopotamus, Wormaldia.

Illustrations. • Chimarra marginata (Marginated Caddis-fly: B. Ent. 561). • Chimarra marginata (B. Ent. 561, legend+text). • Chimarra marginata : B. Ent. 561, text cont.). • Chimarra marginata, female: Stephens VI, 1835. • Wings of assorted Trichoptera. • Philopotamus montanus: 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. http://delta-intkey.com’.

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