MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Hydra, water flea and rotifers, polarized light micrograph. The Hydra is at right, with a Ceriodaphnia water flea at left. At top is part of a colony of Lacinularia rotifer. Hydra are small simple predatory fresh-water animals. They catch small swimming crustaceans such as water fleas using stinging and adhesive cells on their tentacles. Water fleas are small crustaceans, commonly found in fresh water. Rotifers are microscopic aquatic animals that are related to roundworms. Dark field illumination. Magnification: x40 when printed at 10 centimetres tall.
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