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''Sagartia elegans'' is a species of sea anemone in the family Sagartiidae. It is found in coastal areas of northwest Europe at depths down to 50 metres. ==Description== The base of ''S. elegans'' is wider than the column and may reach in diameter. The base is usually anchored to the substrate but can be used as a foot for locomotion. It often has a ragged outline due to fragmentation having occurred. The column is soft and fleshy and varies in shape, even in one individual, from squat to cylindrical or trumpet shaped, and can grow up to tall. The lower part of the column is somewhat corrugated and there are a number of pale coloured suckers on the upper part to which grit or shell fragments may adhere occasionally. The disc is saucer-shaped with an undulating margin and there are up to 200 tentacles arranged irregularly, often arching over the edge. These are mostly about the same length but occasionally there is a much longer one among them. This may be used, as it is in some other sea anemone species, to prevent competing organisms from settling and occupying space nearby. When it is disturbed, a large number of white threads known as acontia are discharged from cells on the column 〔(Family Sagartiadie ) Philip Henry Gosse. A history of the British sea-anemones and corals. Retrieved 2011-09-06.〕 and from the mouth.〔(The occurrence of ''Sagartia elegans'' (Dalyell, 1848) (Anthozoa: Actiniaria) in the Netherlands ) Retrieved 2011-09-06.〕 These are for defensive purposes and are armed with nematocysts.〔 When not submerged, ''S. elegans'' hangs in a limp fashion. It sometimes partially protrudes the lining of its coelom through its mouth.〔 If disturbed it will retract more completely, disappearing from view if it is lodged in a crevice.〔(''Sagartia elegans'' ) Marine Species Identification Portal. Retrieved 2011-09-06.〕 There are a number of differently coloured varieties: * ''Var. miniata'': Disc variously coloured and patterned with similar coloured tentacles, often banded. * ''Var. rosea'': Disc variously coloured and patterned and tentacles rose red. * ''Var. aurantiaca'': Disc grey and tentacles dull orange. * ''Var. nivea'': Disc and tentacles translucent white. * ''Var. venusta'': Disc orange or buff and tentacles white.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sagartia elegans」の詳細全文を読む スポンサード リンク
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