Submitted by Beginning_Exam6255 t3_11s4pgr in askscience
aggasalk t1_jceibkp wrote
all animal eyes use photopigments that are descended from a common ancestor - whether or not that thing (a basal eumetazoan, which would have looked more like a sponge larva than any animal you've ever seen) had eyes, I think probably not. but it seems that, having evolved these supremely useful molecules, evolution figured out pretty quickly the best way to make use of them ("build an eye").
(if there is something recent suggesting a common ancestor to all eyes, i'd really like to see it!)
djublonskopf t1_jcknpvv wrote
There was some genetic work that suggested that the common ancestor of all bilaterians had some kind of simple eye:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1088535/
Basically because Pax6 or its homologues are involved in pretty much all bilaterian eye development.
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