Asteiidae

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Classification

BRACHYCERA, Muscomorpha Schizophora Acalyptratae, Opomyzoidea

Number of British species: 7

Size: S

Difficulty: 2-3

Characters

Minute to small (1-3 mm), delicate, often weakly sclerotized flies with yellow-black or dark colours, male almost always with distinct interfrontal stripes. Arista sometimes bare or pubescent but usually with a characteristic zigzag of longer or shorter alternating rays; Ocelli present Ocellar bristles present or absent; Postvertical bristles weak, parallel, diverging or absent; 0-2 pairs of frontal bristles, if present, curving forward or backward; interfrontal bristles sometimes present immediately above the antennae; scattered interfrontal setulae present; vibrissae absent to present. Wing unmarked; costa continuous; vein Sc incomplete; crossvein BM-Cu and cell cup absent. Tibiae without dorsal preapical bristle.

Biology

The larvae have been found under the bark of trees and have been reared from flower heads (inflorescences) and rotting or dry organic matter; larvae of Leiomyza have been associated with fungi. The adults are often found on flowers, on low vegetation, near sap exuding from tree wounds, and relatively often on windows indoors, or in case of one genus (Leiomyza) near or on mushrooms and bracket fungi in shaded places. Adults of the species Astiosoma rufifrons Duda is attracted to wood ash after bonfires especially during the evening.

Identification

 
families/brachycera/acalyptrates/asteiidae.txt · Last modified: 2008/05/24 17:00 (external edit)     Back to top
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