STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Hydra budding. Coloured scanning electron micrograph (SEM) of a Hydra sp. freshwater hydrozoan budding. Hydra commonly reproduce by budding - a form of asexual reproduction in which a new organism develops from an outgrowth or bud on another one (as seen here). They catch small swimming crustaceans such as daphnia using stinging and adhesive cells on their tentacles (top). Prey is ingested via a mouth (circular, upper centre) at the base of the tentacles. Magnification: x50, when printed 10 centimetres wide.
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