Family Hydridae
 
Hydra Linnaeus, 1758
 
  Hydra attenuata Pallas, 1766 (N?, S?)
  Hydra oligactis (Pallas, 1766) (N?, S?)
  Hydra viridissima (Pallas, 1766) (N?, S?)
  Hydra vulgaris Pallas, 1766 (N?, S?)

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