The surface layer of some copepods produces brilliant flashes of interference colors via microscopic plates that reflect light.

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"A strange copepod called Sapphirina shows dramatic interference colours. Microscopic plates in its surface layers are so arranged as to produce a flash of colour when viewed from certain angles. From other angles, the copepod appears quite transparent." (Foy and Oxford Scientific Films 1982:65)

The grand design: Form and colour in animalsBLA Publishing Limited for J.M.Dent & Sons Ltd, Aldine House, LondonJune 25, 1983
Sally Foy

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