http://www.umiushi.info/photo_species/photo_splist_eng.php?sopt=0&loc=0000
http://www.seaslugforum.net/showall/rostrisb
http://www.sea-slug.com/species/umiusi355.htm
http://www.medslugs.de/E/Pac-NW/Rostanga_risbeci/Selection.htm
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=258
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