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thank you all.

I read in Miguel Tolra's article that flies have a mosaic view! :| The ommatidia projects very tiny and long tubes that diverge.. hence the mosaic view. But it doesn't tell anything about the reason of colourful eyes in Tephritidae like this one (rthere are other flies that have colourful eyes like Ulidiidae, ect..). Can anyone add more info about this question? Thank you