The unusual visual system of the Strepsiptera: external eye and neuropils

  title={The unusual visual system of the Strepsiptera: external eye and neuropils},
  author={Elke K. Buschbeck and Birgit Ehmer and Ronald R. Hoy},
  journal={Journal of Comparative Physiology A},
Adult males of the insect order Strepsiptera are characterized by an unusual visual system that may use design principles from compound as well as simple eyes. The lenses of this eye are unusually large and focus images onto extended retinae. The light-gathering ability of the lens is sufficient to resolve multiple points of an image in each optical unit. We regard each unit as an independent image-forming eye that contributes an inverted partial image. Each partial image is re-inverted by… 
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It is suggested that the disposition of locust ocelli, the spectral sensitivity and the temporal and spatial filtering characteristics of their L neurons suit these cells well to the task of detecting instability in flight.
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Analysis of trilobite vision is strengthened by the use of new mathematical approaches to compound eye design, which implies that function of the holochroal eye was similar to that of modern arthropods, and that they were used in moderate to dim intensities of light.
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The behavioural data strongly suggest that, at least for the optomotor response, the resolution of the strepsipteran compound eye is limited by the ommatidial sampling array and not by the array of retinula cells within each o mmatidium.
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