PETR JAN JURACKA / SCIENCE PHOTO LIBRARY PETR JAN JURACKA / SCIENCE PHOTO LIBRARY
Water flea (Bosmina longirostris). Coloured scanning electron micrograph (SEM) of a water flea. 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. This specimen was found in the Netherlands and measures 0.3mm across.
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