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The internal structure of a sea anemone consists of the contracting muscles, the gonads, the acontial filaments, and the ostium. The retracting muscles consist of simple longitudinal fibers that contract to move the anemone vertically. The sphincter muscles allow the tentacles to close over the oral disk. The gonads can be found in the mesentery.
A typical sea anemone is a sessile polyp attached at the base to the surface beneath it by an adhesive foot, called a basal or pedal disc, with a column-shaped body topped by an oral disc. Most are from 1 to 5 cm (0.4 to 2.0 in) in diameter and 1.5 to 10 cm (0.6 to 3.9 in) in length, but they are inflatable and vary greatly in dimensions.
A number of sea anemone species are commensal with other organisms. Certain crabs and hermit crabs seek out sea anemones and place them on their shells for protection, and fish, shrimps and crabs live among the anemone's tentacles, gaining protection by being in close proximity to the stinging cells.
Also, hydrostatic nature is common in marine life such as jellyfish and sea anemones. Earthworms have rings of muscles that are filled with fluid, making their entire body hydrostatic. A sea anemone has a hydrostatic head, with arms radiating out around the mouth. This structure is helpful in feeding and locomotion. [5]
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.
It includes all of the stony corals, most of which are colonial and reef-forming, as well as all sea anemones, and zoanthids, arranged within five extant orders. [2] The hexacorallia are distinguished from another class of Anthozoa, Octocorallia , in having six or fewer axes of symmetry in their body structure; the tentacles are simple and ...
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 ...
Anatomy of Cydippid Ctenophore Like those of cnidarians , ( jellyfish , sea anemones , etc.), ctenophores' bodies consist of a relatively thick, jelly-like mesoglea sandwiched between two epithelia , layers of cells bound by inter-cell connections and by a fibrous basement membrane that they secrete .