Green hydra, light microscopy footage - HD Stock-Video

Green hydra (Hydra viridissima), light microscopy footage. Hydra are microscopic aquatic invertebrates of the phylum Cnidaria. Green hydra get their colour from symbiotic green algae (Chlorella vulgaris) that live within the hydra's tissues. These freshwater predatory animals have typical cnidarian features: radial symmetry, saclike bodies with only one opening, and stinging tentacles for catching prey. They spend their entire lives as sedentary polyps