| Kingdom | Animalia |
|---|---|
| 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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Common and widespread in Britain (2).