http://www.seaslugforum.net/showall/halgcarl
http://rfbolland.com/okislugs/halgcarl.html
http://rfbolland.com/okislugs/halgcar2.html
http://www.cosmos.ne.jp/~breach/slug%20full%202/nudi%20full39.html
http://www.cosmos.ne.jp/~breach/slug%20full%205/nudi%20full129.html
http://www.medslugs.de/E/Pac-W/Halgerda_carlsoni/Selection.htm
http://www.bunaken.pwp.blueyonder.co.uk/sss-hal-carl-01.htm
http://www.bunaken.pwp.blueyonder.co.uk/sss-hal-carl-02.htm
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Halgerda_carlsoni.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.medslugs.de/E/Pac-NW/Halgerda_carlsoni/Selection.htm
http://www.underwaterkwaj.com/nudi/solomons/s078.htm
http://www.medslugs.de/E/Ind-NW/Halgerda_carlsoni/Selection.htm
http://www.scuba-equipment-usa.com/marine/FEB07/Carlsons_Halgerda(Halgerda_carlsoni).html
http://www.nudibranch.org/Sulawesi Sea Slugs/html/sss-sea-slugs.html
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=239
http://www.medslugs.de/E/Ind-SW/Halgerda_carlsoni/Selection.htm