Blue dragon
Fig. 22: This nudibranch is sometimes called "blue dragon" (lat. pteraeolidia ianthina). It has the phenomenal capability to grow algae in its body which create sugar from sunlight. Therefore this nudibranch requires very little food. There are many different colour variations ranging from blue to brown/green, depending on its age and type of algae breeding. (ref. Sea Slug Forum). Dive #353: "The Hill", Sabang, Mindoro Island, Philippines Nikon D200; Δt=1/250 s; f=60 mm; f/11.0; ISO 100; 6 November 2009 08:57:23