Mating Pteraeolidia ianthina’s.
Adult Pteraeolidia are able to consume and harvest microscopic dinoflagellates that were in a previous symbiotic relationship with Pteraeolidia ‘s food, Hydroids. The nudibranch farms these zooxanthellae within its own digestive diverticula.
It is those symbiotic dinoflagellates that give the species such a variety of colours, from brown to blue and purple. Juveniles of the species are white, having not incorporated any zooxanthellae yet.
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