http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3073124/figure/fig58/
http://rfbolland.com/okislugs/dermocul.html
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Dermatobranchus_oculus.htm
http://www.medslugs.de/E/Pac-W/Dermatobranchus_oculus/Selection.htm