Gastropods A.Cassis madagascarensis (Cassididae), B.Charonia variegata (Cymatiidae), C.Chicoreus brevifrons (Muricidae) D.Tonna galea (Tonnidae), E.Nerita pelotonta (Neritidae), F. Tonna maculosa (Tonnidae), G.Turbinella angulata (Turbinellidae), H.Turritella variegata (Turritellidae), I.Vasun muricatum (Turbinellidae).

Malacology is the study of molluscs. These animals include snails, slugs, octopus, squid, and bivalves generally, such as clams and mussels. Most of them have shells. The shells are often collected for their beauty and interest. Many people eat molluscs, especially those people who live near the ocean.

Those scientists who study molluscs are called malacologists. They identify and classify them, and find out everything they can about their lives.