Green Hydra

Hydra viridissima is a species of cnidarian which is commonly found in still or slow-moving freshwater in the Northern temperate zone. Hydra viridissima is commonly called green hydra due to its coloration, which is due to the symbiotic green algae Chlorella vulgaris which live within its body. Recent genomic research has shown that Hydra viridissima suppresses parts of its innate immune system to allow its symbiotic Chlorella algae to survive within its cells.

Hydra viridissima ou l'hydre d'eau douce est une espèce d'hydres qui se trouve à la fois dans les eaux tempérées et tropicales fraîches. H. viridissima a un corps très mince (de 5 à 15 mm de long pour environ 1 mm de large).

Hydra viridissima es una especie de hidrozoo de la familia Hydridae, ampliamente distribuida en zonas templadas norteñas. Es un organismo común tanto en aguas en la temprana primavera como de otoños tardíos. El verde característico viene de células del algas unicelulares Chlorella, dentro (literalmente) de las células de la gastrodermis.