Hydra (genus)

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Hydra americana
Hydra attenuata (or Hydra vulgaris)
Hydra canadensis
Hydra carnea
Hydra cauliculata
Hydra circumcincta
Hydra hymanae
Hydra littoralis
Hydra magnipapillata
Hydra minima
Hydra oligactis
Hydra oregona
Hydra pseudoligactis
Hydra rutgerensis
Hydra utahensis
Hydra viridis
Hydra viridissima
Hydra vulgaris

Hydra is a genus of simple fresh-water animal possessing radial symmetry. Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrozoa.[1][2] They can be found in most unpolluted fresh-water ponds, lakes, and streams in the temperate and tropical regions and can be found by gently sweeping a collecting net through weedy areas. They are usually a few millimetres long and are best studied with a microscope. Biologists are especially interested in hydras due to their regenerative ability; and that they appear not to age or die of old age. However, there is not scientific unanimity yet on whether Hydra undergo senescence, as discussed below.

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