http://slugsite.us/bow/phil/nigra.html
http://www.seaslugforum.net/showall/phylnigr
http://online.divers.ne.jp/ono/seaslug4/room4-12.html
http://www.medslugs.de/E/Pac-W/Phyllidiella_nigra/Selection.htm
http://www.arl.nus.edu.sg/mandar/yp/EPIC/nudi/nudipages/nigra.html
http://www.bunaken.pwp.blueyonder.co.uk/sss-phyl-nigra-01.htm
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Phyllidiella_nigra.htm
http://rfbolland.com/okislugs/phylnigr.html
http://www.nudibranch.com.au/pages/2977et.htm
http://reefguide.org/indopac/phyllidiellanigra.html
http://www.nudibranch.org/Philippine Sea Slugs/html/nudibranchs/phyllidiella-nigra-01.html
http://www.nudipixel.net/species/phyllidiella_nigra/
http://www.nudibranch.org/Sulawesi Sea Slugs/html/sss-sea-slugs.html
http://marliwakeling.jalbum.net/Nudibranchs/slides/Phyllidiopsis nigra.html
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=384