新型オナホール
http://upload.wikimedia.org/wikipedia/commons/thumb/5/59/Lamprey_mouth.jpg/800px-Lamprey_mouth.jpg
http://www.utsc.utoronto.ca/~youson/images/lamprey.jpg
http://scienceblogs.com/aardvarchaeology/upload/2007/05/Lamprey.jpg
http://library.thinkquest.org/03oct/00946/pic_used/sea_lamprey.jpg