WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Obelia hydrozoan. Light microscope footage of a polyp from a colony of Obelia sp. hydrozoans. These sessile marine hydrozoans form stalked colonies. The polyps' tentacles are used to capture passing plankton organisms on which they feed. There is also a free swimming medusa stage. Magnification: x44 at 10 centimetres wide.
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