hydrozoans
27 Aug, 2014
a class of stinging, predatory invertebrate animals, some solitary and others living in colonies. Includes freshwater Hydra polyps and many types of marine hydroids, some of them noxious pests in the aquarium.
27 Aug, 2014
a class of stinging, predatory invertebrate animals, some solitary and others living in colonies. Includes freshwater Hydra polyps and many types of marine hydroids, some of them noxious pests in the aquarium.