British Insects: the Families of Diptera


L. Watson and M. J. Dallwitz




Adult insects. Slender-bodied; stilt-legged. Antennae 8–16 segmented; ‘simple’; not aristate. Ocelli present. Eyes rounded, well separated. The maxillary palps 3–5 segmented; drooping. Thorax without a continuous dorsal suture. Posterior division of pronotum with one or more long bristles. Wing veins reaching the margin 6–8 (? - fewer than 9). Wings without a discal cell; without a sub-apical cell; without a closed anal cell. Sub-costa short and ending free. The leading edge veins markedly stronger than the rest (?). Media and cubitus veins connected via a cross vein or by a fusion. Wings with the lower calypter much reduced or absent. Tibiae apically spurred. Feet without a triple pad. Abdomen constricted basally.

Larvae and pupae. The larvae terrestrial; eucephalic. The pupae without a puparium.

Classification. Suborder Nematocera; Division Bibionomorpha; Superfamily Sciaroidea.

British representation. 3 species in Britain. Genera 2; Ditomyia, Symmerus.

Illustrations. • Ditomyia fasciata (from Walker).

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 Diptera. Version: 1st January 2012.’.