British Insects: the families of Caddis flies (Trichoptera)


L. Watson and M. J. Dallwitz

Molannidae Wallengr.

Adults. Adults not minute. Antennae about as long as the fore-wings (to slightly longer); rather stout. Ocelli absent. Maxillary palps 5 segmented; the terminal segment inflexible, not multi-articulated, not annulated, and not much elongated.

The fringes of the wings shorter than the maximum width of the hind-wings (the wings long and very narrow, with rounded apices, the fore-wings densely pubescent). The fore-wings 10–15 mm long; without a discoidal cell; apical forks not reliably interpretable, the neuration unconventional. The hind-wings similar in width to the fore-wings; without a discoidal cell; apical forks not reliably interpretable.

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

Larvae. The larvae constructing and living in transportable cases. The larval case shield-shaped, and made of sand grains, with wing-like lateral extensions. The larvae eruciform. The mesonotum sclerotized; entire (cf. Hickin’s figure), or divided into four sclerites (cf. his key!). The metanotum entirely membranous.

British representation. 2 species. Genera: Molanna.

Illustrations. • Molanna angustata Curtis: B. Ent. 716. • Molanna angustata Curtis: B. Ent. 716, legend+text. • Molanna angustata Curtis: B. Ent. 716, text cont.. • Molanna angustata: Stephens VI, 1835. • Molanna angustata: wing venation, maxillary palp. • Molanna angustata: larva and case.

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.’.