http://slugsite.us/bow/nudwk213.htm
http://www.seaslugforum.net/showall/hypskrak
http://www.unterwasserbilder.de/marin3/schne2/phi388.htm
http://www.vibrantsea.net/krakatoa12_anilao8.html
http://www.medslugs.de/E/Pac-W/Hypselodoris_krakatoa/Selection.htm
http://www.sea-slug.com/species/umiusi305.htm
http://www.vibrantsea.net/krakatoa22_anilao14.htm
https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Hypselodoris_krakatoa.htm
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.medslugs.de/E/Pac-NW/Hypselodoris_krakatoa/Selection.htm
http://www.vibrantsea.net/krakatoa5_anilao32.htm
http://www.nudibranch.org/Philippine Sea Slugs/html/nudibranchs/hypselodoris-krakatoa-01.html
http://www.nudibranch.org/Sulawesi Sea Slugs/html/sss-sea-slugs.html
http://rfbolland.com/okislugs/hypskrak.html
http://www.medslugs.de/E/Ind-E/Hypselodoris_krakatoa/Selection.htm
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=582
https://www.vibrantsea.net/krakatoa8830_anilao2019.htm
https://www.vibrantsea.net/krakatoa8092_anilao2019.htm