http://rfbolland.com/okislugs/oken_sp1.html
http://slugsite.us/bow/pan/okenia1.html
http://slugsite.us/bow/pan/okenia2.html
http://slugsite.us/bow/wirtz99/plate_4/wirtz_3h.htm
http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi115.html
http://www2.gateway.ne.jp/~coon/slug-32.htm
http://www.sea-slug.com/species/umiusi203.htm
http://www.medslugs.de/E/Atl-E/Okenia_sp_02/Selection.htm
http://www.sea-slug.com/species/umiusi341.htm
http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi353.html
http://www.civgeo.rmit.edu.au/bryozoa/cheilostomatida/euthyrisellidae/pleucla.html
http://www.diveoz.com.au/nudibranchs/gallery/display_nudibranch.asp?nudi=61
http://www.seaslugsofhawaii.com/species/Okenia-sp1-a.html
http://www.seaslugsofhawaii.com/species/Okenia-sp2-a.html
https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Okenia_sp_01.htm
https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Okenia_sp_02.htm
http://slugsite.us/bow2007/nudwk766.htm
http://tahitinudi.jimdo.com/liste-des-espèces/okenia-sp-1
http://rfbolland.com/okislugs/oken_sp2.html
http://www.medslugs.de/E/Pac-NW/Okenia_sp_03/Selection.htm
http://www.medslugs.de/E/Pac-NW/Okenia_sp_04/Selection.htm
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=682
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=684
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=719
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=996
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=1228
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=1251
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=1308
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=1324
http://www.nuditahiti.com/liste-des-espèces/okenia-sp-2/
http://www.nuditahiti.com/liste-des-espèces/okenia-sp-3/
http://www.nuditahiti.com/liste-des-espèces/okenia-sp-4/
http://slugsite.us/bow2007/nudwk942.htm
http://www.vibrantsea.net/okenia3642_anilao2015.htm
http://slugsite.us/bow2007/nudwk969.htm
http://www.medslugs.de/E/Pac-NW/Okenia_sp_05/Selection.htm
http://www.medslugs.de/E/Pac-NW/Okenia_sp_06/Selection.htm
http://www.medslugs.de/E/Ind-E/Okenia_sp_07/Selection.htm
http://www.medslugs.de/E/Pac-W/Okenia_sp_09/Selection.htm
http://www.medslugs.de/E/Pac-W/Okenia_sp_10/Selection.htm
https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Okenia_sp_03.htm
http://www.medslugs.de/E/Pac-W/Okenia_sp_11/Selection.htm
http://www.medslugs.de/E/Pac-W/Okenia_sp_07/Selection.htm
http://www.medslugs.de/E/Pac-W/Okenia_sp_12/Selection.htm
http://www.medslugs.de/E/Pac-SW/Okenia_sp_13/Selection.htm
http://www.medslugs.de/E/Pac-W/Okenia_sp_14/Selection.htm
http://www.medslugs.de/E/Ind-E/Okenia_sp_14/Selection.htm
http://www.medslugs.de/E/Atl-W/Okenia_sp_15/Selection.htm
http://www.medslugs.de/E/Ind-NW/Okenia_sp_16/Selection.htm
http://www.medslugs.de/E/Pac-W/Okenia_sp_17/Selection.htm