What are the flower like ocean dwelling invertebrate with stinging tentacles?

The flower-like ocean-dwelling invertebrates with stinging tentacles are sea anemones. They are marine invertebrates belonging to the class Anthozoa of the phylum Cnidaria. Sea anemones are characterized by their radial symmetry, a central mouth surrounded by tentacles, and a hollow body cavity. They have a unique stinging mechanism called nematocysts, which are small, specialized cells that contain venomous threads used for capturing prey and defense. Sea anemones come in various colors, shapes, and sizes, and can be found in a wide range of marine habitats from the shallows to the deep sea.