Hydra (genus)

Hydra
	Hydra budding
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Hydrozoa
Order:	Anthoathecata
Family:	Hydridae; Dana, 1846
Genus:	Hydra; Linnaeus, 1758
Species
	List * Hydra baikalensis Swarczewsky, 1923 ; * Hydra beijingensis Fan, 2003 ; * Hydra canadensis Rowan, 1930 ; * Hydra cauliculata Hyman, 1938 ; * Hydra circumcincta Schulze, 1914 ; * Hydra daqingensis Fan, 2000 ; * Hydra ethiopiae Hickson, 1930 ; * 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 javanica Schulze, 1929 ; * Hydra liriosoma Campbell, 1987 ; * Hydra madagascariensis Campbell, 1999 ; * Hydra magellanica Schulze, 1927 ; * Hydra mariana Cox & Young, 1973 ; * Hydra minima Forrest, 1963 ; * Hydra mohensis Fan & Shi, 1999 ; * Hydra oligactis Pallas, 1766 ; * Hydra oregona Griffin & Peters, 1939 ; * Hydra oxycnida Schulze, 1914 ; * Hydra paludicola Itô, 1947 ; * Hydra paranensis Cernosvitov, 1935 ; * Hydra parva Itô, 1947 ; * Hydra plagiodesmica Dioni, 1968 ; * Hydra polymorpha Chen & Wang, 2008 ; * Hydra robusta (Itô, 1947) ; * Hydra rutgersensis Forrest, 1963 ; * Hydra salmacidis Lang da Silveira et al., 1997 ; * Hydra sinensis Wang et al., 2009 ; * Hydra thomseni Cordero, 1941 ; * Hydra umfula Ewer, 1948 ; * Hydra utahensis Hyman, 1931 ; * Hydra viridissima Pallas, 1766 ; * Hydra vulgaris Pallas, 1766 ; * Hydra zeylandica Burt, 1929 ; * Hydra zhujiangensis Liu & Wang, 2010;

Hydra (/ˈhaɪdrə/ HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria. They are native to the temperate and tropical regions. The genus was named by Linnaeus in 1758 after the Hydra, which was the many-headed beast of myth defeated by Heracles, as when the animal has a part severed, it will regenerate much like the mythical hydra’s heads. Biologists are especially interested in Hydra because of their regenerative ability; they do not appear to die of old age, or to age at all.

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