PETR JAN JURACKA / SCIENCE PHOTO LIBRARY PETR JAN JURACKA / SCIENCE PHOTO LIBRARY
Water flea spina. Scanning electron micrograph (SEM) showing the spina of a water flea (Daphnia hrbaceki). Water fleas (order Cladocera) are small crustaceans, commonly found in fresh water. They are filter feeders that ingest algae, protozoa or organic matter, and are a constituent of plankton. Magnification: x580, when printed 10 centimetres wide.
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