Symsagittifera roscoffensis
Jan 06, 2018 • 9:44 AM UTC
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I have the chance to live by the sea in the north west of France, in Brittany. Here, it’s quite easy to sample Symsagittifera roscoffensis directly on the beach during the low tide. They basically look like this under the foldscope :
These free-living acoelomorph worms, formerly called Convoluta roscoffensis , have a characteristical green color because they contain microalgae named Tetraselmis convolutae . And because of this symbiosis, they are naturally attracted by light in order to feed the algae inside. It’s a phototaxis organism as you can see on this simple video I made. Time is about 2 minutes :
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