In aquaria, Diplosoma virens colonies (2–6 mm diameter) exhibited autonomous locomotion at average speeds of 4.7 ± 0.53 mm per 12-h period. They moved more frequently on vertical surfaces than on horizontal surfaces. Motility may allow this ascidian to position itself
in light conditions favorable to its algal symbionts. In nature, Trididemnum solidum colonies were also observed to move, but more slowly, probably by a combination of growth and regression. Such didemnid ascidians may frequently change the occupation of space in coral reef communities
by moving about, overgrowing and killing coelenterate tissue, then regressing and leaving the substratum open for invasion by other species.
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