Obelia hydrozoan, light micrograph

Obelia hydrozoan, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Obelia hydrozoan. Light micrograph of feeding polyps (hydranths) forming part of an Obelia geniculata hydroid colony. The feeding polyps are each surrounded by a cup (hydrotheca), and consist of a tubular body leading to a globular hypostome, which ends in the mouth. Around the top of the tube are solid tentacles that contain many stinging cells (nematocysts). These inject poison into the prey, after which the prey is passed to the mouth and later the body where it is digested. Magnification: x36 when printed at 10 centimetres high.

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Keywords: anatomical, anatomy, animal, biological, biology, cells, coelenterate, colonial, colony, fauna, feeding polyp, feeding polyps, hydranth, hydranths, hydrotheca, hydrozoa, hydrozoan, hydrozoid, hypostome, invertebrate, invertebrates, light micrograph, light microscope, lm, marine biology, mouth, nature, nematocyst, nematocysts, obelia geniculata, poison, polyp, polyps, stinging cell, tentacle, tentacles, wildlife, zoological, zoology

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