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Triactis
''Triactis'' is a genus of sea anemone in the family Aliciidae. It is monotypic, having only one species – ''Triactis producta''.〔 This is found in shallow waters in the Indo-Pacific where it lives on the seabed, rocks and corals. It derives much of its energy needs from the symbiotic algae it contains. It also forms a mutualistic relationship with small ''Lybia'' crabs.
==Description==
''Triactis producta'' is a small, cryptic, pale brown sea anemone. The base grows to about in diameter and the column tapers slightly and extends to about in height. It is topped by a crown of about 50, relatively long tentacles. Halfway up the column there is a ring of branching, pale brown pseudo-tentacles. These are tubular extensions of the wall of the column and on their upper side there are a few semi-spherical bulges known as vesicles. These can be grey, pink or green and are packed with stinging cells called cnidocytes.〔(The sea anemone ''Triactis producta'' Klunzinger, 1877 by Andrea L. Crowther ) Invertebrate Zoology. Retrieved 2012-02-17.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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