ecofactbook
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species
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Animalia
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Cnidaria
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Hydrozoa
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Anthoathecata
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Hydridae
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Hydra
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Hydra brandyensis
Hydra canadensis
Hydra circumcincta
Hydra ethiopiae
Hydra madagascarensis
Hydra mariana
Hydra oligactis
Hydra orientalis
Hydra oxycnida
Hydra paranenois
Hydra utahensis
Hydra viridissima
Hydra vulgaris
Hydra zelanica
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Hydra brandyensis