Family: Hydridae
Originator: Brage Førland
Minst to arter i to slekter er funnet i ferskvann i Norge.
Systematics :
| Kingdom | Animals (Animalia) | |||||
| Phylum | Coelenterates (Cnidaria) | |||||
| Klasse | Hydrozoans (Hydrozoa) | |||||
| Order | Hydroider (Hydroidea) | |||||
| Family | Hydridae | |||||
| Genus | Hydra | |||||
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