1. Mollusks Kingdom Animalia Phylum Mollusca Class Gastropoda Class Bivalvia Class Cephlapoda

2. Mollusks 50,000 species 10 classes Includes: ◦ Squid ◦ Octopus ◦ Clams ◦ Conches ◦ Snails ◦ Sea slugs ◦ Oysters

3. Basic Anatomical Structures: a) Mantle – muscular bag that surrounds the gills and most organs and is used to circulate water 1. some use it to circulate water or jet propulsion 2. secretes calcium carbonate shell

4. Basic Anatomical Structures: b) Foot – muscular structure used for movement 1. In snails & slugs it’s used to crawl 2. In bivalves it’s used to dig 3. In squids, it takes the form of tentacles

5. Basic Anatomical Structures: c) Radula – a tongue like structure with scraping teeth

6. Class Gastropoda Includes snails, slugs, whelks, & abalone Defining Characteristics: - Radula - Some have a shell - Sensitive Tentacles - Shell-less members can produce toxins or store eaten nematocysts

8. SnailsSea Slugs WhelksAbalone