Jewel anemone

The column of this species is smooth and roughly cylindrical, being slightly wider at the base and oral disc than in the centre. The base can grow to a diameter of about 10 mm (0.4 in) and is often ragged in outline; this is because the animal divides by longitudinal fission, and sometimes the two new individuals remain partially united. The individuals are usually found in dense aggregations, but each animal is only lightly attached to the substrate and can drift away. The tentacles are short to medium length, with tapering shafts and knobbed tips, and are in two whorls; the outer tentacles are the longer and the inner ones more numerous. The colour of this anemone is very variable; the column, tentacles and knobbed tips may be contrasting hues of white, pink, orange, red and green, while the oral disc is usually translucent, either plain or splashed with white. One common form is emerald green with brown tentacles with crimson tips, often with the oral disc having a crimson marginal ring.