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The Elephant Ear Anemone, also known as Balloon Corallimorph, is a single-polyp, free-living cnidarian (unlike most coral species, which live in and form 'communities'). It has a circular disc with short tentacles and, like all sea anemones and corallimorphs, has a central mouth. There is a smooth ring near the edge of the disc that is lighter in color and has no tentacles.
Based on my personal observation, these corallimorphs seem to like sandy bottoms or rubble areas near coral reefs.
The picture series shows two individuals: the first one is shown in the first three photos. The fourth photo shows a juvenile individual. The first one measured about 25cm across; the second about 12cm.