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• W2048894805 abstract "The rhabdom of the compound eye of the whirligig beetle Gyrinus natator is continuous throughout, with a distal section formed by the rhabdomere of the retinula cell 1, and a proximal section formed by the rhabdomeres of the cells 2–7, plus the basal cell 8. The dorsal and the ventral eyes, although structurally similar, differ in the shape of the distal rhabdomere and the lengths of the various components of the eye. In course of the adaptation to darkness, the length of the cell 1 rhabdomere is increased by 50% in the dorsal eye as compared with 80% in the ventral eye. The crystalline tract is reduced to one-fourth in the dorsal eye, but it is completely reduced in the ventral eye. Therefore the space between the dioptric system and the basal part of the rhabdom is not only the result of the reduction of the crystalline tract but also, in a high proportion, of the elongation of the rhabdomere 1. This is documented by the proximal displacement of the entire zone of the basal rhabdom and of the changing shape of the basement membrane. As there is no screening pigment between the dioptric system and the basal part of the rhabdom in the dark-adapted state, the enlarged space represents a clear zone. Since a wide clear zone allows light from several facets to affect a particular rhabdom, the light sensitivity is probably increased. The displacement of the basal section of the rhabdom represents a mechanism of adaptation not previously described. Under conditions of adaptation to light, the basement membrane in both the dorsal and ventral eyes is convexly arched (as the cornea) into the capsule of the eye. Under condition of adaptation to darkness, the basement membrane of the ventral eye is evenly stretched, whereas in the dorsal eye it is convexly arched into the head capsule. In the course of adaptation to darkness, the screening pigments of the primary pigment cells are shifted distally. This leads to an enlarged aperture. The pigments of the secondary pigment cells are then placed in the terminal cell areas. This produces the pigment-free clear zone of a superposition-eye, which is penetrated only by the thin rhabdomere 1. The question as to what extent the beetle is able to use the principles of both an apposition- and a superposition-eye is raised. In my experiments, a selective adaptation to green or UV light was not detectable. The probability of perception of polarized light also seems to be low." @default.
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• W2048894805 date "1976-01-01" @default.
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• W2048894805 title "Adaptationserscheinungen in den komplexaugen von Gyrinus natator L. (Coleoptera : Gyrinidae)" @default.
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• W2048894805 doi "https://doi.org/10.1016/0020-7322(76)90009-x" @default.
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