Taxonomic Hierarchy
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| Kingdom | Animalia
– Animal, animaux, animals |
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| Subkingdom | Radiata
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| Phylum | Cnidaria Hatschek, 1888
– cnidarians, coelenterates, cnidaires, coelentérés, água viva, anêmona, caravela, cnidario, coral, hidra |
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| Subphylum | Medusozoa
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| Class | Hydrozoa Owen, 1843
– hydralike animals, hydroids, hydrozoans, hydraires, hydrozoaires, água viva, hidra, hidrozoa, hidrozoário, pólipo |
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| Subclass | Hydroidolina
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| Order | Anthoathecatae
– athecate hydroids, hydromedusae |
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| Suborder | Capitata Kühn, 1913
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| Family | Hydridae
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| Genus | Hydra Linnaeus, 1758 |
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Direct Children: |
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| Species |
Hydra americana Hyman, 1929
– white hydra | |
| Species |
Hydra canadensis Rowan, 1930
– Alberta hydra | |
| Species |
Hydra carnea L. Agassiz, 1850
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| Species |
Hydra cauliculata Hyman, 1938
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| Species |
Hydra hymanae Hadley and Forrest, 1949
– Jersey hydra | |
| Species |
Hydra littoralis Hyman, 1931
– swiftwater hydra | |
| Species |
Hydra minima Forrest, 1963
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| Species |
Hydra oligactis Pallas, 1766
– brown hydra | |
| Species |
Hydra oregona Griffin and Peters, 1939
– Oregon hydra | |
| Species |
Hydra pseudoligactis (Hyman, 1931)
– false brown hydra | |
| Species |
Hydra rutgerensis Forrest, 1963
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| Species |
Hydra rutgersensis Forrest, 1963
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| Species |
Hydra utahensis Hyman, 1931
– Utah hydra | |
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