Hydra

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If undisturbed, the body and tentacles may occasionally sway gently. If disturbed, a hydra usually shortens until it is a tiny ball.

Keywords

hydra, jellyfish, polyp, coelenterata, fresh-water polyp

Galleries

Jellyfish

Source

Buel P. Colton, Zoology: Descriptive and Practical (Boston:D.C. Heath & Co., 1903) 313

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