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Sea anemones (/ ə ˈ n ɛ m. ə. n i / ə-NEM-ə-nee) are a group of predatory marine invertebrates constituting the order Actiniaria. Because of their colourful appearance, they are named after the Anemone, a terrestrial flowering plant. Sea anemones are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia.
Aiptasia is a widely distributed genus of temperate and tropical sea anemones of benthic lifestyle typically found living on mangrove roots and hard substrates. These anemones, as well as many other cnidarian species, often contain symbiotic dinoflagellate unicellular algae of the genus Symbiodinium living inside nutritive cells.
When underwater, this sea anemone opens up to display numerous tentacles, arranged in three whorls. Out of water, the tentacles retract and the anemone closes to resemble a dome shaped red, crimson, brown, green or black blob of jelly, about 4 cm (1.6 in) across and 2.7 cm (1 in) high.
There are thousands of different species of sea anemones in the ocean with some living as far deep as 32,000 feet. Anemones are marine invertebrates that are closely related to jellyfish.
Sea anemones in general can be found anywhere from the intertidal zone all the way to a depth of 30,000 feet. Condylactis gigantea plays an important role in their subtidal communities by providing shelter to a variety of commensals (several fish and cleaner shrimp species), and they serve as "base stations" for fish cleaning activity.
The beadlet anemone (Actinia equina) is a common sea anemone found on rocky shores around all coasts of Western Europe and the Mediterranean Sea, and along the Atlantic coast of Africa as far south as South Africa and Australia. Actinia equina can be found both in exposed and sheltered situations.
Pacific sea nettles, Chrysaora fuscescens. Cnidaria (/ n ɪ ˈ d ɛər i ə, n aɪ-/ nih-DAIR-ee-ə, NY-) [4] is a phylum under kingdom Animalia containing over 11,000 species [5] of aquatic invertebrates found both in fresh water and marine environments (predominantly the latter), including jellyfish, hydroids, sea anemones, corals and some of the smallest marine parasites.
Located along the eastern coast of the U.S., with a few introduced populations scattered along the western U.S. coast and the southeast coast of Britain, this sea anemone is a member of the sea ...