British Insects: the families of Caddis flies (Trichoptera)


L. Watson and M. J. Dallwitz

Beraeidae Wallengr.

Adults. Adults quite small to minute; black. Antennae about as long as the fore-wings; fairly stout; with an elongated first segment. Ocelli absent. Maxillary palps 5 segmented; the terminal segment inflexible, not multi-articulated, not annulated, and not much elongated. The scutellum exhibiting a pair of warts.

The fore-wings 4–6 mm long; without a median cell; without a discoidal cell; apical forks not reliably interpretable, the neuration being “unstable and irregular”. The hind-wings narrower than the fore-wings to similar in width to the fore-wings; without a discoidal cell; apical forks not safely interpretable.

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

Larvae. The larvae constructing and living in transportable cases; eruciform. The right mandible exibiting a brush of hairs on its inner (concave) surface. The thorax without a prosternal horn. The mesonotum sclerotized; divided longitudinally into two sclerites. The metanotum entirely membranous; bearing brushes of bristles. The metasternum with no more than a median pair of bristles. Abdominal segment 1 with retractable papillae; 8 with a lateral comb of fine spicules. The larva with the terminal abdominal prolegs fused basally, forming an ostensible tenth segment.

Comments. The hind tarsal claw of the larva elongated, as long as the tarsus.

British representation. 4 species. Genera: Beraea, Bereodes, Ernodes.

Illustrations. • Beraea, Ernodes, Bereodes: wing venation.

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.’.