Home Animals Cnidarians Sea Anemone : Characteristics, Diet, Facts & More [Fact Sheet] Sea anemones , nature’s underwater bouquet, are one of the ocean’s most captivating creatures. With their colorful and graceful appearance, they resemble delicate flowers, yet they are voracious predators with fascinating biology. This article explores the captivating world of sea anemones , detailing their classification, habitat, behavior, diet, reproduction, and more. Description of the Sea Anemone Most sea anemones are made up of a base, and an oral disk surrounded by tentacles. The base is a stalk that connects the animal to a rock or other surface. The oral disk is the sea anemone ’s version of a face – it has a flat surface with a mouth in the middle, and prey-catching tentacles around the edges. Sea anemones come in virtually every shape, size, and color. Interesting Facts About the Sea Anemone Learn about sea anemones, marine predators that resemble land-based anemones. Find out their body structure, digestive system, reproduction, and symbiotic relationships with other organisms. Sea anemones are soft-bodied marine invertebrates in the order Actiniaria, a part of the phylum Cnidaria, which also includes corals, jellyfish, and hydroids. They exist as polyps, characterized by a cylindrical, columnar body with an oral disc on the top and a pedal disc at the base. Their mouth is surrounded by one or more whorls of tentacles that are equipped with defensive stinging cells called cnidocysts.