http://www.pictonb.freeserve.co.uk/nudibranchs/denfro.html
http://egersund.asterisk.no/~emil/d-frondo.jpg
http://slugsite.us/bow/pacific/frondosu.html
http://www.gla.ac.uk/~gbza62/dendro.html
this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/dfrondos.html
http://www.asterisk.no/~emil/nudibranchia/dendronotus_frondosus.htm
http://www.bio.bris.ac.uk/teaching/units/b11000/nudi8.htm
http://www.nudibranch.org/Scottish%20Nudibranchs/dendronotus-frondosus.html
http://www.ntnu.no/~vmzotbak/nudibranchia/dendronotidae/dendronotus_frondosus.htm
http://www.seaslugforum.net/showall/dendfron
http://www.nudibranch.org/Scottish%20Nudibranchs/dendronotus-frondosus-face.html
http://www.metridium.com/monterey/nudibranchs/frondosus.html
http://www.medslugs.de/E/Atl-NE/Dendronotus_frondosus/Selection.htm
http://www.wttfw.freesurf.fr/biology/biology_liste.php?langue=uk&action=classif#Opistobranchia
http://www.h.do-up.com/home/takayan/takapage478.htm
http://www.ne.jp/asahi/kappa-kuri/miyamoto/OSEHOO/umiushi344.html
http://www.habitas.org.uk/marinelife/species.asp?item=W12670
http://www.underwaterkwaj.com/nudi/california/c033.htm
http://www.seawater.no/fauna/Blotdyr/busksnegl.htm
http://www.guiamarina.com/gallery/v/Baltic+Sea/03+Animals/05+Mollusca/Opisthobranchia/Dendronotus+frondosus/
http://www.nudipixel.net/species/dendronotus_frondosus/
http://www.medslugs.de/E/Atl-NW/Dendronotus_frondosus/Selection.htm