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from Mollus = meaning “Soft” Kingdom: Animalia Phylum: Mollusca Class: Gastropoda “stomach foot” E.g. snails, slugs, sea slugs (nudibranchs) One shell or none Garden snail, Conch 1 Tree Snail Abalone Banana Slug 2 Giant African land snail Nudibranchs 3 Class: Bivalvia E.g. clams, mussels, oysters, scallops Two shells 4 Class Cephalopoda “head foot” E.g. squid, octopus, nautilus, cuttlefish No shell or one (nautilus) 5 1. Body Structure A. Eucoelomate Hollow body cavity Lined with peritoneum (endoderm) B. Three-Part Body Plan 1. Visceral mass Internal organs, i.e. guts 2. Foot Locomotion 3. Mantle Secretes shell Respiration in terrestrial mollusks 6 2. Level of Organization Organ system 3. Symmetry Bilateral 4. Habitat Aquatic : marine and fresh water Terrestrial 5. Feeding Complete digestive tract; mouth & anus Feeding patterns: filter feeders, herbivores, carnivores (predators) Radula – rasping file w/ 100’s of tooth-like structure - in all mollusks except: bivalves Snail radula 6. Respiration 7 Aquatic – gills Terrestrial - mantle & some with primitive lung 7. Internal transport Two Types: 1. Open Circulatory System Blood flow = does NOT always stay in vessels Heart→ vessels→ tissue→ sinus→ vessels→ heart E.g. Gastropoda & Bivalvia 2. Closed Circulatory System Blood flow = blood stays in vessels or heart Heart→ vessels→ tissue→ vessels→ heart E.g. Cephalopoda 8. Excretion Nephridia (Simple kidneys) 9. Response 8 Brain with nervous system ( Gastropoda & Cephalopoda) Exception: Bivalvia- NO HEAD, no brain Sensory cells: touch, smell, taste, balance (statocysts) True eyes (Cephalopoda, some Gastropoda) 9 Ocelli (Scallops) 10. Locomotion Muscles are present Some sessile (mussels, oysters) Some use foot to burrow, crawl/ drag selves (clams) 10 Some use tentacles to creep/crawl Some swim (using siphon) (squid, octopus, nautilus, cuttlefish, sea slugs) Some flutter away (scallops) 11. Reproduction Almost all dioecious Some release sperm or eggs into water Some use internal fertilization 12. Ecological Roles 11 Food for many Destruction: *snails & slugs destroy crops * shipworms (clams) destroy docks, piers, wharves, & wooden ships Cuttlebone – used for parakeets’ beak health Pearls 12 Black pearls Medical Research (do NOT get cancer) 13
