URMO Taxon list
Hydra americana Hyman, 1929 accepted as Hydra vulgaris Pallas, 1766
Hydra baikalensis Swarczewsky, 1923
Hydra beijingensis Fan, 2003
Hydra canadensis Rowan, 1930
Hydra carnea L. Agassiz, 1851 accepted as Hydra vulgaris Pallas, 1766
Hydra cauliculata Hyman, 1938
Hydra circumcincta Schulze, 1914
Hydra daqingensis Fan, 2000
Hydra graysoni Maxwell, 1970 accepted as Hydra circumcincta Schulze, 1914
Hydra hadleyi (Forrest, 1959)
Hydra harbinensis Fan & Shi, 2003
Hydra hymanae Hadley & Forrest, 1949
Hydra iheringi Cordero, 1939
Hydra intaba Ewer, 1948
Hydra intermedia De Carvalho Wolle, 1978
Hydra japonica Itô, 1947
Hydra liriosoma Campbell, 1987
Hydra littoralis Hyman, 1931 accepted as Hydra vulgaris Pallas, 1766
Hydra madagascariensis Campbell, 1999
Hydra magellanica Schulze, 1927
Hydra magnipapillata Itô, 1947 accepted as Hydra vulgaris Pallas, 1766
Hydra mariana Cox & Young, 1973
Hydra minima Forrest, 1963
Hydra mohensis Fan & Shi, 1999
Hydra oligactis Pallas, 1766
Hydra oregona Griffin & Peters, 1939
Hydra oxycnicoides Schulze, 1927 accepted as Hydra oxycnida Schulze, 1914
Hydra oxycnida Schulze, 1914
Hydra paludicola Itô, 1947
Hydra parva Itô, 1947
Hydra pirardi Brien, 1961 accepted as Hydra oxycnida Schulze, 1914
Hydra plagiodesmica Dioni, 1968
Hydra pseudoligactis (Hyman, 1931) accepted as Hydra canadensis Rowan, 1930
Hydra robusta (Itô, 1947)
Hydra rutgersensis Forrest, 1963
Hydra salmacidis Lang da Silveira, Souza-Gomes & de Souza e Silva, 1997
Hydra umfula Ewer, 1948
Hydra utahensis Hyman, 1931
Hydra viridissima Pallas, 1766
Hydra vulgaris Pallas, 1766
Pelmatohydra oligactis (Pallas, 1766) accepted as Hydra oligactis Pallas, 1766