http://rfbolland.com/okislugs/halgdiap.html
http://rfbolland.com/okislugs/halgdia2.html
http://rfbolland.com/okislugs/halgdia3.html
http://www.seaslugforum.net/showall/halgdiap
http://www.cosmos.ne.jp/~breach/slug%20full%205/nudi%20full133.html
http://online.divers.ne.jp/ono/seaslug4/room4-9.html
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.medslugs.de/E/Pac-NW/Halgerda_diaphana/Selection.htm
http://slugsite.us/bow/nudwk514.htm
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Halgerda_diaphana.htm
http://www.medslugs.de/E/Pac-W/Halgerda_diaphana/Selection.htm
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=240