http://www.seaslugforum.net/showall/cuthgymn
http://www.habitas.org.uk/marinelife/species.asp?item=W14780
http://www.gla.ac.uk/~gbza62/catriona.html
http://www.ntnu.no/~vmzotbak/nudibranchia/tergipedidae/cuthona_gymnota.htm
http://www.nudibranch.org/Scottish%20Nudibranchs/catriona-gymnota.html
http://www.medslugs.de/E/Atl-NE/Catriona_aurantia/Selection.htm
http://www.habitas.org.uk/marinelife/species.asp?item=W14780
http://www.seawater.no/fauna/Blotdyr/gymnota.htm