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   clacke (clacke@libranet.de)'s status on Wednesday, 15-Mar-2023 00:24:36 JST clacke

   • Dr. Dan Killam
   @alex @dantheclamman Even better:
   
   "In some species of marine slugs (Onchidium), individual animals possess two eye types. The first type is a pair of cephalic eyes structurally similar to other lens eyes of gastropods. The second eye type is a lens eye that projects from the back of the animal."
   
   To this layman it sounds like eyes in such different positions would make it more likely that they have independent heritage, but maybe some actual biologist will tell me that's likely not the case at all and that's not how that works.
   • Embed this notice
     Dr. Dan Killam (dantheclamman@scicomm.xyz)'s status on Wednesday, 15-Mar-2023 13:07:53 JST Dr. Dan Killam

     in reply to

     @clacke @alex I will avoid speculating on eye evolution because that's a famously controversial field that I don't know enough about :blob_laughing: ! But yes many mollusks have redundant systems of photosensing, including the examples you both have mentioned. Even giant clams have literal eyes with simple retinas that can resolve shapes, but also sense light through the activity of their symbiotic algae

     clacke likes this.