Abstract
The apposition compound eye ofArtemia sp. (a brine shrimp) has a glycogen lens inside the crystalline cone. Owing to the absence of a corneal lens, the glycogen lens is solely responsible for the focusing on the rhabdom tip. Examination of the light-dark adaptation mechanism revealed the following: 1. No pigment migration and only small changes in the palisade. 2. A slight increase in diameter of the distal part of the rhabdom during dark adaptation. 3. A pronounced shortening of the cone during dark adaptation, resulting in a reduced distance between the glycogen lens and the rhabdom. 4. Simultaneous with (3), the glycogen lens elongates as the radii of curvature of the refracting surfaces decrease.
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