http://www.seaslugforum.net/showall/cyernigr
https://www.inaturalist.org/taxa/499465-Cyerce-nigricans
http://slugsite.us/bow/cyerc_n2.htm
http://www.medslugs.de/E/Pac/Cyerce_nigricans/Selection.htm
http://online.divers.ne.jp/ono/seaslug4/room4-15.html
http://www.nudibranch.com.au/pages1/G_1215.htm
http://sacoglossa.lifedesks.org/pages/34169
http://tahitinudi.jimdo.com/liste-des-espèces/cyerce-nigricans/
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=88
http://www.medslugs.de/E/Pac-SW/Cyerce_nigricans/Selection.htm
http://www.medslugs.de/E/Pac-W/Cyerce_nigricans/Selection.htm
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