Strepsipteran forewings are haltere-like organs of equilibrium

@article{Pix2005StrepsipteranFA,
  title={Strepsipteran forewings are haltere-like organs of equilibrium},
  author={Waltraud Pix and Gerbera Nalbach and Jochen Zeil},
  journal={Naturwissenschaften},
  year={2005},
  volume={80},
  pages={371-374}
}
The forewings of male Strepsiptera share striking morphological similarities with the hindwing-derived halteres of flies [1-3] that are known to be gyroscopic organs of equilibrium [4-6]. In a combined study of functional morphology and behavior we show for the first time conclusively that the specialized forewings in male Strepsiptera play the same role as halteres in flies. Rotational movements of the animal produce Coriolis forces at the rapidly oscillating clubshaped forewings. These forces… 

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Compensatory head reactions of flies to imposed body rotations in yaw, pitch and roll are quantitatively analysed and the haltere is characterized as a sense organ for maintaining equilibrium as well as a method to mimick rotational stimuli by subjecting the body of a flying fly to vibrations.

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The halteres of the blowfly Calliphora

  • G. Nalbach
  • Physics, Education
    Journal of Comparative Physiology A
  • 2004
TLDR
From these considerations it is concluded that Coriolis forces play the major role in detecting body rotations.

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