FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Waterflea (Daphnia sp.) head. Brightfield illuminated light micrograph of the head of a water flea, showing its antennae (upper left). 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: x86 when printed 10 centimetres wide.
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