British Insects: the Families of Diptera


L. Watson and M. J. Dallwitz



Adult insects. Small to medium-sized (6–8 mm long); slender-bodied; stilt-legged. The back of the head very concave. Antennae 2–6 segmented; ‘modified’; aristate; the arista dorsal. The second antennal segment not grooved. Ptilinal suture clearly defined. Post-vertical orbital bristles present; divergent. Mouthparts functional. The maxillary palps 1 segmented; porrect. Vibrissae absent. Thorax without a continuous dorsal suture; without well defined posterior calli. Wing venation complete, in the sense of exhibiting 1st and 2nd basal, anal and discal cells. Wings with a discal cell; with a closed anal cell (apically very convex). The costa with one break (near the end of R1). Sub-costa apparent; reaching the costa independently of vein 1. Wing vein 6 present. Wings with the lower calypter much reduced or absent. The hind femora not thickened with spines beneath as in Megamerinidae. Tibiae without a dorsal pre-apical bristle. Hind tibiae without strong bristles in the basal 4/5.

Larvae and pupae. The larvae acephalic. The pupae enclosed within a puparium.

Comments. Very long, thin flies, with the head silvery-topped.

Classification. Suborder Brachycera; Division Muscomorpha Schizophora Acalyptratae; Superfamily Diopsoidea.

British representation. 1 species in Britain. Genera 1; Tanypeza longimana.

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.’.