Marine Animal Encyclopedia
Tetraselmis convolutae Acetabularia acetabulum
Although it can survive free-living, the tiny cells of Tetraselmis convolutae often live inside a worm host (see Green beaches) in a symbiotic relationship. The worm provides them with shelter and a constant environment inside its body. The worm’s light-seeking behavior gives the algae ideal conditions for photosynthesis, which in turn provides both algae and worm with nutrients and energy.