Abstract
IN entomology the real compound eye (excluding the agglomerated eye) is considered to be provided with the hexagonal facet either in its outer or inner layer of the cornea. It is well known that the size of the facet is uniform, in most of the compound eye of insects with some exceptional cases, such as the eyes of a certain Tabanid-fly and dragon-fly, and moth of Psilogramma increta. The first type of the eye is formed by two divided parts with large and mall facets, the second type of the eye has facets the size of which increases from ventrally to dorsally, and the third type of the eye has small facets at the peripheral part and has larger facets the size of which increases toward the centre of the eye. I have found that the compound eye of a butterfly of Leptidea (Pieridae) has two kinds of deformed hexagonal facet which differ in the size intermingling together with an irregular arrangement in the whole surface of the eye as shown in Fig. 1.
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References
Yagi, N., and Koyama, N., The Compound Eye of Lepidoptera: Approach from Organic Evolution (Maruzen Co., Tokyo, 1963).
Müller, J., Zur vergleichenden Physiologie des Gesichtsinnes der Menschen und der Tiere (Leipzig, 1826).
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YAGI, N. A New Type of the Compound Eye. Nature 201, 527 (1964). https://doi.org/10.1038/201527a0
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DOI: https://doi.org/10.1038/201527a0
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