http://www.seaslugforum.net/showall/okenatki
http://ianskipworth.com/suig/nudis.html
https://www.inaturalist.org/taxa/1521046-Ceratodoris-atkinsonorum
http://www.medslugs.de/E/Pac-SW/Ceratodoris_atkinsonorum/Selection.htm
http://slugsite.us/bow2007/nudwk898.htm