British Insects: the Families of Diptera


L. Watson and M. J. Dallwitz



Adult insects. Very small (about 2.5 mm long); winged. Antennae 3 segmented (third segment short, rounded); ‘modified’; aristate; the arista dorsal (pubescent). The second antennal segment not grooved. Ptilinal suture clearly defined. Ocellar bristles absent. Post-vertical orbital bristles absent. Mouthparts functional. The maxillary palps 1 segmented; porrect. Vibrissae present (two strong pairs). Thorax without a continuous dorsal suture; without well defined posterior calli. Wing venation incomplete, in the sense of lacking one or more of the cells. Wings without a discal cell; with a closed anal cell. The anal cell short. The costa with one break (at the apex of the sub-costa). Sub-costa apparent; reaching the costa independently of vein 1. Wing vein 4 extending far beyond the end of the first basal cell (the first basal cell about 1/5 the length of the wing). Wings with the lower calypter much reduced or absent. Tibiae with a dorsal pre-apical bristle to without a dorsal pre-apical bristle (the bristle indistinct). Hind tibiae without strong bristles in the basal 4/5.

Larvae and pupae. The larvae terrestrial; saprophagous (on decomposing material around tree wounds); acephalic. The pupae enclosed within a puparium.

Comments. A shining brown fly, with a large mouth.

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

British representation. 1 species in Britain. Genera 1; Aulacigaster leucopeza.

Illustrations. • Aulacigaster.

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.’.