1. Phylum Mollusca, Class Gastropoda The Gastropods (Class Gastropoda) are the largest and most varied group of Molluscs Gastropod means “stomach footed”; a typical gastropod is a coiled mass of organs enclosed by a dorsal shell, which rests on the foot – Have head and sensory structures on head – Operculum: trap door, pulls in snail to shell

2. Phylum Mollusca, Class Gastropoda

3. Most gastropods use their radula to scrape algae from rocks (e.g., periwinkles, limpets, and abalone) Others are carnivorous and use their radula to drill into the shells of bivalves and other gastropods Nudibranchs, or sea slugs, are gastropods that have lost their shell altogether