Summary
The ommatidia in the two dorsal rows at the rim of the eye of Aglais urticae differ from all the other ommatidia of the large dorsal area, in rhabdom structure, length, and configuration of the ninth retinula cell. The type of rhabdom in this dorsal rim zone provides the structural prerequisites for the reception of polarized light; functional subdivision of the retina into two parts is indicated.
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Kolb, G. Retinal ultrastructure in the dorsal rim and large dorsal area of the eye of Aglais urticae (Lepidoptera). Zoomorphology 106, 244–246 (1986). https://doi.org/10.1007/BF00312045
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DOI: https://doi.org/10.1007/BF00312045