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Aplysina insularis
''Aplysina insularis'', the yellow-green candle sponge or yellow tube sponge, is a species of demosponge that is found on reefs in the Caribbean Sea and the Gulf of Mexico.
==Description==
''Aplysina insularis'' is a large sponge and consists of one or more cylindrical tubes united at the base. Each one narrows at the apex into a large osculum and this may be surrounded by small, finger-like projections. Slender tendrils and larger rope-like projections may also occur, and in areas with high levels of sedimentation, these may exceed the tubes in size. This sponge can grow to a length of with a tube diameter of and the texture is soft yet tough. The outer surface is either smooth or covered with fine conical projections. There are no silicaceous spicules in the wall but it is strengthened with a network of fibres forming a hexagonal or circular mesh pattern.〔(【引用サイトリンク】title=''Aplysina insularis'' )〕〔(【引用サイトリンク】title=''Aplysina insularis'' (Duchassaing & Michelotti, 1864) )〕 The colour is yellowish brown and in deeper water changes to an intense greenish yellow because the surface layers of the sponge fluoresce in the blue (only) light that penetrates this far into the water.〔 If bruised or removed from the water, this sponge turns dark purple or black, exuding a substance that can stain a person's skin, leaving a mark that is difficult to eradicate.〔
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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