Coloured scanning electron micrograph (SEM) of Marine copepod (crustacean; Actitius sp.). Actitius is a genus of marine, calanoid copepods in the family Metridinidae. All species in the family can produce blue-green bioluminescence. The light is produced in specialized glands in the copepod. Magnification x5.5 when shortest axis printed at 25 millimetres.
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