Compound eyes fall into two groups : apposition eyes, which form multiple inverted images, and superposition eyes, which form a single erect image.
2.
There are several exceptions to this rule, such as with the diurnal Zygaenidae and Sytomidae families of moths, both of which have apposition eyes, or the nocturnal Hedyloidea family of butterflies, which are nocturnal and feature superposition eyes.
3.
Optical superposition eyes are constrained to a spherical shape, but other forms of compound eyes may deform to a shape where more ommatidia are aligned to, say, the horizon, without altering the size or density of individual ommatidia.
4.
The compound eyes of " C . dipterum " show a striking sexual dimorphism, whereby females have lateral apposition eyes, while the males'eyes have an additional dorsal " turban-shaped " parts that function as superposition eyes.
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