British Insects: the Families of Diptera
| British Insects: the Families of Diptera | |
Adult insects. Very small. Antennae 3 segmented (third segment long or short); ‘modified’. Antennae aristate; the bristle dorsal (pubescent or short-plumose). The second antennal segment not grooved. Ptilinal suture clearly defined. Post-vertical orbital bristles present; convergent. Mouthparts functional. The maxillary palps 1 segmented; porrect. Vibrissae present (one pair). Thorax without a continuous dorsal suture; without well defined posterior calli. Wings with a discal cell to without a discal cell (the cross-vein separating discal cell from basal cell incomplete); without a sub-apical cell; with a closed anal cell. The anal cell short. The costa with one break (near the end of vein 1), or with two breaks (sometimes also near the humeral cross-vein). Sub-costa apparent; joining vein 1 well short of the costa (visible and distinct only basally). Vein 6 present. Wings with the lower calypter much reduced or absent. Tibiae with a dorsal pre-apical bristle. Hind tibiae without strong bristles in the basal 4/5.
Larvae and pupae. Larvae acephalic. Pupa enclosed within a puparium.
Comments. Very small greyish or brownish-grey flies, with complete wing venation.
Classification. Suborder Brachycera; Division Muscomorpha Schizophora Acalyptratae; Superfamily Ephydroidea.
British representation: Genera 1; 6 species.
Illustrations: • Diastata.
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: 9th April 2007. http://delta-intkey.com’.
