http://www.pictonb.freeserve.co.uk/nudibranchs/corgra.html
http://www.seaslugforum.net/showall/flabgrac
http://www.medslugs.de/E/Atl-NE/Microchlamylla_gracilis/Selection.htm
http://www.ntnu.no/~vmzotbak/nudibranchia/flabellinidae/coryphella_gracilis.htm
http://www.nudibranch.org/Scottish%20Nudibranchs/flabellina-gracilis.html
http://www.habitas.org.uk/marinelife/species.asp?item=W14510
http://www.seawater.no/fauna/Blotdyr/gracilis.htm
http://www.nudipixel.net/species/flabellina_gracilis/

https://zookeys.pensoft.net/article/21885/zoom/fig/130/