Operation of the alula as an indicator of gear change in hoverflies.

  title={Operation of the alula as an indicator of gear change in hoverflies.},
  author={Simon M. Walker and Adrian Lloyd Thomas and Graham K. Taylor},
  journal={Journal of the Royal Society, Interface},
  volume={9 71},
The alula is a hinged flap found at the base of the wings of most brachyceran Diptera. The alula accounts for up to 10 per cent of the total wing area in hoverflies (Syrphidae), and its hinged arrangement allows the wings to be swept back over the thorax and abdomen at rest. The alula is actuated via the third axillary sclerite, which is a component of the wing hinge that is involved in wing retraction and control. The third axillary sclerite has also been implicated in the gear change… CONTINUE READING
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