freshwater hydra

== English == === Noun === freshwater hydra (plural freshwater hydras) A solitary polyp, of species Hydra vulgaris, similar to a sea anemone consisting of a hollow cylinder about 10 mm long with a mouth surrounded by tentacles, usually found attached to the under surfaces of water plants in ponds and streams. ==== Synonyms ==== freshwater polyp ==== Translations ==== === References === Hydra vulgaris on Wikipedia.Wikipedia Hydra vulgaris on Wikispecies.Wikispecies Category:Hydra vulgaris on Wikimedia Commons.Wikimedia Commons