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The visual pigments of peripheral retinula cells in fly eyes have been investigated by microspectrophotometry in vivo. Since flies have a pupil mechanism (Kirschfeld and Franceschini, 1969) which may invalidate the visual pigment measurements, the technique has been applied to the pupil-less mutant chalky of the blowflyCalliphora erythrocephala. It proves that the data acquired previously from wild type blowflies with the in vivo method (Stavenga et al., 1973) are indeed reliable.

Fly visual pigments difference in visual pigments of blowfly and dronefly peripheral retinula cells