Plakobranchus sp.  Genus: van Hasselt, 1824

http://slugsite.us/bow/phil/plac2.html
http://www.conservation.org/science/cptc/capbuild/unesco/asia/yabshi/nudi.htm
http://www.underwaterkwaj.com/nudi/solomons/s110.htm
http://sacoglossa.lifedesks.org/pages/34482
http://www.nudipixel.net/species/plakobranchus_sp/
http://www.nudibranch.org/Sulawesi Sea Slugs/html/sss-sea-slugs.html