WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Water flea. Light microscope footage of the head of a water flea (Daphnia sp.). Daphnia are small freshwater planktonic crustaceans. Prominent here are the organism's compound eye (black area, top) and the gut (green, lower frame). Within its body, individual blood cells are seen circulating. Daphnia are around one millimetre in length. Their transparent bodies have made them a popular subject for microscopy and physiological studies, and they are a model organism in biology.
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