http://www.medslugs.de/E/Pac-NE/Doriopsilla_rowena/Selection.htm
this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/dnigroma.html
via webarchive:
http://web.archive.org/web/20000416143520/http://www.biology.ucsc.edu/classes/bio161l/NUDI/dnigroma.html
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