Hydra sp. polyp

Hydra sp. polyp

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Credit: ERIC GRAVE/SCIENCE PHOTO LIBRARY

Caption: Hydra polyp. Light micrograph of a freshwater coelenterate polyp, Hydra sp., asexually reproducing by budding off a daughter polyp. The anterior of the creature consists of a mouth surrounded by tentacles. These capture food such as small water fleas and algal cells which float past on the current. They are then passed to the mouth; waste is also excreted through the mouth. In good feeding conditions Hydra sp. reproduce asexually, but sexually reproduce by releasing sexual cells into the water for fertilisation when conditions are poor. Magnification: x13 at 35mm size.

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Keywords: animal, asexual reproduction, budding, ceoelenterate, coelenterate, freshwater, hydra, invertebrate, invertebrates, light micrograph, nature, polyp, wildlife, zoology

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