Species under Hydra
n= 11
Species name Common name Distribution Max. Length (cm)
Hydra americana
Hyman, 1929
white hydra North America
Hydra canadensis
Rowan, 1930
Alberta hydra North America
Hydra cauliculata
Hyman, 1938
North America
Hydra hymanae
Hadley & Forrest, 1949
Jersey hydra North America
Hydra littoralis
Hyman, 1931
swiftwater hydra North America
Hydra minima
Forrest, 1963
North America
Hydra oligactis
Pallas, 1766
brown hydra North America
Hydra oregona
Griffin & Peters, 1939
Oregon hydra North America
Hydra pseudoligactis
(Hyman, 1931)
false brown hydra North America
Hydra rutgersensis
Forrest, 1963
North America
Hydra utahensis
Hyman, 1931
Utah hydra North America
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