http://www.pictonb.freeserve.co.uk/nudibranchs/oncpus.html
http://www.habitas.org.uk/marinelife/species.asp?item=W13370
http://opistobranquis.info/en/guia/nudibranchia/euctenidiacea/doridacea/onchidoris-pusilla/
http://www.medslugs.de/E/Med/Knoutsodonta_pusilla/Selection.htm