Wart slug
Fig. 6: A wart slug (Phyllidia coelestis) with coral polyps. Dive #350: "Sabang Point", Sabang, Mindoro Island, Philippines — EXIF: Nikon D200; Δt=1/250 s; f=60 mm; f/11.0; ISO 100; 2009-11-05 8:50:32