http://www.sea-slug.com/species/umiusi131.htm
http://www.seaslugforum.net/showall/crataffi
http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi267.html
http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.medslugs.de/E/Pac-NW/Cratena_affinis/Selection.htm
http://www.dragonmouse.com.au/diving/nudibase.php?action=nudidetail&id=217
http://www.umiushi-zukan.com/eng/list_pic.php?kind_id=458
http://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Cratena_affinis.htm
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