Symsagittifera roscoffensis
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Symsagittifera roscoffensis, formerly called Convoluta roscoffensis, is a free-living acoelomorph worm.
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[edit] Appearance
Symsagittifera roscoffensis is a small (about 15 mm long) flat worm. Due to the algae, Tetraselmis convolutae living in its body cavity, it has green colour.
[edit] Ecology and distribution
In its adult stage, the worm has no mouth and hence never eats. Instead it lives off of the excesses of its symbiotic algae, (Tetraselmis convolutae), which live inside of it. The worm provides shelter and some nutritional benefits in return.
The worm can be found in sheltered sand beaches on the southern coast of English Channel.
[edit] Significance to humans
Symsagittifera roscoffensis is one of the model organisms for studying the development of bilaterians.