Some species of nudibranchs such as Pteraeolidia ianthina sequester whole living symbiotic zooxanthellae within their digestive diverticula, and thus they also manage to be "solar-powered".
Pteraeolidia ianthina, one of the most common aeolids found, is often called a "blue dragon" by Eastern Australian divers because of its close resemblance to a Chinese dragon.