Coloration of reef organisms
 
 

photograph of a Christmas-tree nudibranch Learchis poica courtesy Anne Dupont, FloridaThis is a trick question...let's see if you fell for it:

The eyes of nudibranchs are small, cannot form images, and are unable to distinguish colours. Moreover, nudibranchs are without exception hermaphroditic . So, of course the colours are not sexually based!

 
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