The Molluscs are a large phylum of about 100,000 species. They are characterised by the shell and the mantle that secretes it, the radula which is a peculiar file-like feeding structure, and the moluscan gills. The phylum includes, as well as certain primitive groups, the Bivalves which include the cockle and mussel, the Cephalopods which include the cuttlefish, squid and octopus, and the Gastropods which include the limpet, whelk, snails and slugs.
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- Mollusks of San Salvador, Bahamas Photos of representatives of the major families of bivalves and gastropods.
- An Identification Manual for the Freshwater Snails of Florida Provides a key to the freshwater bivalves and gastropods of the south east US.
- Alabama Mollusks Overview of endangered, common, and exotic freshwater and marine bivalves and gastropods.
- Mollusca Information from the Tree of Life Project about mollusk systematics with references and links.
- Catalogue of Mediterranean Seashells Listing of major taxa in the region in all molluscan classes with line drawings of some species.
- Keys to the Mollusks of the Hawaiian Islands Identification guide to Hawaiian bivalves and gastropods.
- Seashells of New South Wales A guide to the sea shells of New South Wales, Australia, with high quality images and detailed information.
- Mollusks: Phylum Mollusca A diverse group of animals that include cephalopods (squid, octopuses, cuttlefish), gastropods (nudibranchs, snails, slugs, limpets, sea hares) and bivalves (mussels, clams, oysters, scallops).
- The Phylum Mollusca Introduction to these organisms, with photographs and information on the various classes and their biology.
- Barton Beds: Gastropods, Scaphopod, Cephalopod Photographs of the fossil shells of molluscs from the UK.
- Galaxy of Images: Shells and Mollusks Provides images from the printed books and manuscripts in the collections of the Smithsonian Institution Libraries.
- Freshwater Molluscan Shells Martin Kohl supplies a gallery and extensive systematic information about freshwater gastropods and bivalves.
- Life on Australian Seashores: Molluscs A useful guide to Australian marine molluscs, providing for each species a description and details of distribution, habitat and biology.
- The Mollusca Online material for a course at Simon Fraser University. Includes anatomical diagrams and photographs of the different classes of mollusk.
- Phylum Mollusca Information about mollusks from the Animal Diversity Web.
- Check List of European Marine Mollusca This site provides a searchable database that allows the user to search for taxonomic references by taxon, geographical locality, author or keyword.