Summary
The structure of the eyespots of the free-swimming larva ofPolystoma integerrimum (Monogenea, Polystomatidae) was studied by electron microscopy. Each eyespot is rhabdomeric in type, with one cup-shaped supportive cell and one sensory cell. The supportive cell is characterized by concentric rows of platelets, separated by 120 nm. This entirely new structure in a platyhelminth acts like a concave mirror of a telescope in concentrating the light. Moreover, at each interface of lamellae of platelets, light is amplified. InPolystoma, the light concentration occurs by reflection whereas it occurs by refraction in all other platyhelminths studied up to now. Among the monogenean Trematodes, all the Polystomatidae appear to present this reflecting system.
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Fournier, A., Combes, C. Structure of photoreceptors ofpolystoma integerrimum (platyhelminths, monogenea). Zoomorphologie 91, 147–155 (1978). https://doi.org/10.1007/BF00993858
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DOI: https://doi.org/10.1007/BF00993858