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The radially symmetrical snakelocks anemone, A. viridis, is distinguished by its long greenish tentacles. The green coloration is due to the photosynthetic zooxanthellae algae growing in the tentacles' tissues. Without the chlorophyll of the algae, the anemone would appear gray or light brown. Sometimes the tentacle tips are purple. The snakelocks anemone has some of the longest tentacles of all sea anemones. With up to over 200 sticky tentacles, the snakelocks anemone grows to 20 cm across and eight cm tall. The tentacles are lined with venomous stinging cells called cnidocysts.
Snakelocks anemones live best attached to the bottom in shallow salt water and intertidal pools. These anemones have been found as far down as 20 meters, but are rare below 10-12 meters.