http://rfbolland.com/okislugs/halgtess.html
http://www.medslugs.de/E/Pac-W/Halgerda_tessellata/Selection.htm
http://www.seaslugforum.net/showall/halgtess
http://www.eperak.com/slugsite/Doridacea.html
http://www.cosmos.ne.jp/~breach/slug%20full%202/nudi%20full54.html
http://slugsite.us/bow/nudwk234.htm
http://www2.gateway.ne.jp/~coon/slug-22.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Halgerda_tessellata.htm
http://www.medslugs.de/E/Pac-NW/Halgerda_tessellata/Selection.htm
http://www.nudibranch.com.au/pages/0151b.htm
http://www.underwaterkwaj.com/nudi/cryptobranchs/e026.htm
http://www.underwaterkwaj.com/nudi/solomons/s087.htm
http://www.underwaterkwaj.com/nudi/pohnpei/p026.htm
http://reefguide.org/indopac/halgerdatessellata.html
http://www.scuba-equipment-usa.com/marine/AUG05/Tessellated_Halgerda(Halgerda_tessellata).html
http://www.nudipixel.net/species/halgerda_tessellata/
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=243
http://www.dragonmouse.com.au/diving/nudibase.php?action=nudidetail&id=209
http://www.vibrantsea.net/halgerda3298_anilao2015.htm
http://www.vibrantsea.net/halgerda6653_anilao2017.htm
http://www.medslugs.de/E/Pac-SW/Halgerda_tessellata/Selection.htm