LM of colonial hydroid Obelia sp

LM of colonial hydroid Obelia sp

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Credit: DR CLIVE KOCHER/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of the colonial hydroid Obelia sp. , showing pairs of blastozooid and feeding polyps attached to a central stolon (red stalk). The stolon net covers large areas of stones, seaweed, buoys and flotsam, sending out tiny branches perpendicularly, up to 4cm in length. Obelia (order Thecaphora-Leptomedusae), posseses a flask-like envelope into which the polyp heads can retract. A division of labour exists in the colony: the blastozooid polyps (no tentacles) containing medusal buds are concerned with reproduction, whilst the ones with tentacles take in food. Magnification: x25 at 35mm size.

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Keywords: animal, coelenterate, colonial, hydroid, invertebrate, invertebrates, light micrograph, nature, obelia, wildlife, zoology

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