British Insects: the Families of Diptera


L. Watson and M. J. Dallwitz



Lesser House-flies.

Life style non-parasitic.

Adult insects. Small to medium-sized; robustly-built. Antennae 2–6 segmented; ‘modified’. The second antennal segment distinctly grooved above. Ptilinal suture clearly defined. Mouthparts functional. The maxillary palps 1 segmented; porrect. Thorax with the dorsal suture continuous across the middle; with well defined posterior calli. Hypopleural bristles absent. Wings with a discal cell; without a sub-apical cell; with a closed anal cell. The anal cell short. Sub-costa apparent; reaching the costa independently of vein 1. The leading edge veins not noticeably stronger than the rest. Wings without a sharp bend in vein 4. Wing vein 6 present; falling short of the wing margin (very short). Wing vein 7 present; falling short of the wing margin (sharply curved). Wings with a well developed lower calypter. Hind tibiae with strong bristles in the basal 4/5.

Larvae and pupae. The larvae aquatic to terrestrial (often in semi-liquid media); saprophagous, or coprophagous, or consuming stored produce, or mycophagous (generally associated with decaying matter or excrement); acephalic. The pupae enclosed within a puparium.

Comments. Frons never with crossed bristles.

Classification. Suborder Brachycera; Division Muscomorpha Schizophora Calyptratae; Superfamily Muscoidea.

British representation. 60 species in Britain. Genera 2; Fannia, Piezura.

Illustrations. • Fannia (Hammond).

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.’.