Marine Animal Encyclopedia
Green Acoel Flatworm Convoluta roscoffensis
Although difficult to see individually, green acoel flatworms show up when they collect together in puddles of water on sandy shores at low tide. Green acoel flatworms harbor tiny, single-celled algae that color them bright green. In warm, sunlit pools the algae can photosynthesize and pass some of the food they make to their host. Green acoel flatworms are very sensitive to vibrations and quickly disappear down into the sand if footsteps approach.