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Ink production in cephalopods and gastropods
A series of striking convergences can be found in the sea-hares (Aplysia), a group of gastropods and only remotely related to the cephalopods. Not only do they emit ink clouds (the colour is derived from ingested red algae), but they also employ chemical cues that assist in defense.
Compound eyes in arthropods
It is clear that amongst the arthropods as a whole the compound eye has evolved at least twice, and possibly even more times.