http://www.seaslugforum.net/factsheet.cfm?base=rostcalu
http://www.seaslugforum.net/rostcalurad.htm
http://www.bluering.org.au/Opisthobranchs-2423.htm
https://www.inaturalist.org/taxa/418361-Rostanga-calumus
http://www.medslugs.de/E/Pac-SW/Rostanga_calumus/Selection.htm