Slug-Related Web Sites:
AlgaeBase: Database of algae worldwide. If you want to know more about the food plants described here, this is a great place to start.
Medslugs: Sea slugs from the Mediterranean and other places too.
Scottish Nudibranchs: Beautiful photos of well, um, Scottish nudibranchs and other Scottish sea slugs.
Sea Slugs of Hawaii: Excellent source of information and images of Hawaiian slugs, including E. ornata, E. rufescens, and E. tomentosa.
The Sea Slug Forum: No longer updated, but the archives are a trove of information.
Cataloging Diversity in the Sacoglossa: a great site containing descriptions of a large number of Sacoglossans, including Elysia, with links to much additional information.
Nudibranch.org: Stunning photos of nudibranchs and slugs.
The Slug Site: A clearinghouse of interesting info and photos of slugs.
Sea Slugs from Reunion Island: Photos and descriptions of sea slugs from islands in the Indian Ocean
Encyclopedia of Marine Life of the British Isles: Lots of different phyla, but an excellent section on sea slugs, snails, and bivalves.
Marli Wakeling’s Nudibranchs and Sea Slugs of the World: Photos of nudibranchs and sea slugs from the Caribbean and Pacific.
Invasive Marine Algae of Hawaii: Describes many of our favortites, including Bryopsis and Avrainvillea.