https://www.inaturalist.org/observations?place_id=any&subview=map&taxon_id=1471717
http://www.medslugs.de/E/Atl-E/Goniodoris_castanea/Selection.htm
http://www.nudibranch.org/Scottish%20Nudibranchs/goniodoris-castanea.html
http://www.seaslugforum.net/showall/gonicast
http://www.ugr.es/~lstocino/goniodoris_castanea.htm
http://www.sea-slug.com/species/umiusi285.htm
http://www.retenatura.it/nudibranchi/002.htm
http://www.medslugs.de/E/Med/Pelagella_castanea/Selection.htm
http://www.medslugs.de/E/Atl-NE/Pelagella_castanea/Selection.htm
http://www.habitas.org.uk/marinelife/species.asp?item=W12960
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=144
http://opistobranquis.info/en/guia/nudibranchia/euctenidiacea/doridacea/goniodoris-castanea/
http://www.medslugs.de/E/Atl-E/Pelagella_castanea/Selection.htm
http://www.medslugs.de/E/Atl-SE/Pelagella_castanea/Selection.htm