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Eumetazoa (metazoans)
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Class Hydrozoa
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Order Anthoathecata
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Family Hydridae
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Genus Hydra
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Species Hydra americana
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Species Hydra beijingensis
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Species Hydra canadensis
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Species Hydra cauliculata
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Species Hydra circumcincta
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Species Hydra daqingensis
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Species Hydra hadleyi
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Species Hydra harbinensis
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Species Hydra hymanae
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Species Hydra iheringi
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Species Hydra intaba
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Species Hydra intermedia
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Species Hydra japonica
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Species Hydra liriosoma
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Species Hydra madagascariensis
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Species Hydra mariana
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Species Hydra minima
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Species Hydra mohensis
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Species Hydra oligactis
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Species Hydra oregona
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Species Hydra oxycnida
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Species Hydra paludicola
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Species Hydra parva
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Species Hydra plagiodesmica
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Species Hydra robusta
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Species Hydra rutgersensis
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Species Hydra salmacidis
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Species Hydra umfula
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Species Hydra utahensis
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Species Hydra viridissima
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Species Hydra vulgaris
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