Rhabdometric and ciliary eyes

Isn’t that a great title? Insects have compound eyes with rhabodmetric receptors; veretbrates have simple eyes with ciliary receptors. But if you go back far enough, looking at polychaete marine worms for example, you find hints of an ancestor that had both kinds of eyes. Read all about it (with diagrams!) in Pharyngula: Rhabdometric and ciliary eyes.

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