This ctenophore Beroe forskalii illustrates one of the reasons that many transparent organisms have pigmented guts. It has just ingested a lobate ctenophore Leucothea, and if the lights were off, the glow of the luminescing prey would be visible to passing creatures. The Beroe is swimming from right to left in this picture, and its mouth is at the left. (Approx. length 12 cm)

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