| Kingdom | Animalia |
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| Phylum | Cnidaria |
| Class | Hydrozoa |
| Order | Capitata |
| Family | Hydridae |
| Genus | Hydra (1) |
| Size | Length of tentacles: up to 25 cm (2) Body length: 20-30 mm (2) |
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Learn about the scientific name of this species and how it fits into the tree of life at Nature Navigator. |
Common and widespread in Britain (2).
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