Hydra (genus)

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Scope note
Members of a genus containing freshwater invertebrate animals of very simple structure, the body having the form of a cylindrical tube, with a mouth surrounded by a ring of tentacles with stinging thread-cells, usually living attached to objects or plants, though able to float or move by cartwheeling from base to tentables; they reproduce by buds or eggs.
Hydra
Accepted term: 13-May-2024