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The animal is translucent greenish with white patches on the head and neck. There can be some brown lines on the head and body. The shell valves are translucent clear and the greenish mantle, with its distinctive patter of brownish lines and scattered white patches, can be seen through the shell (Valdés et al., Caribbean Sea Slugs, 2006).
This sea slug retains photosynthetically active chloroplasts (kleptoplasty) for 12 hours to 3 days from Caulerpa verticillata, the algae on which it feeds (Clark et al., 1990).