http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.seaslugforum.net/showall/hervaffi
http://www.medslugs.de/E/Pac-NW/Herviella_affinis/Selection.htm
http://slugsite.us/bow/nudwk475.htm
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=647