this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/tadspersa.html
http://www.habitas.org.uk/marinelife/species.asp?item=W14820
http://www.seaslugforum.net/showall/teneadsp
http://www.medslugs.de/E/Atl-E/Tenellia_adspersa/Selection.htm
http://www.medslugs.de/E/Atl-NE/Tenellia_adspersa/Selection.htm
http://www.medslugs.de/E/Pac-NE/Tenellia_adspersa/Selection.htm
http://slugsite.us/bow2007/nudwk1242.htm