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The effect of _________ on __________ of freshwater (rams horn and pond snails) and saltwater (common periwinkle, Littorina littorea) Domain Eukarya Kingdom Animalia Phylum Mollusca (or soft-bodied) Phylum Mollusca Characteristics: *Soft-bodied invertebrate covered with protective mantle that may or may not form a hard, calcium carbonate shell *Second largest animal phylum. Largest Marine phylum *Have a muscular foot for movement which can be modified into tentacles *Complete, one-way digestive tract with a mouth & anus *Cephalization - have a distinct head with sense organs & brain *Have a scraping, mouth-like structure called a radula* *Go through free-swimming larval stage called trochophore radula Eastern mudsnail (Ilyanassa obsolete) or Common periwinkle (Littorina littorea) observation and experimentation Get to know your subject: • Diagram and label snail using the laptop or textbook as guide • Make at least five behavioral observations • State two differences among individuals in your group Experiment: • Create an experiment to learn something about snails in general. • On a piece of butcher paper you will write up your findings. Include: • Purpose (1 sentence) • Hypothesis (1 sentence) • Data (table and graph) • Conclusion (one paragraph. State WHY data is as it is) Class 1 of 3: Gastropods (or stomach-foot) They include: nudibranchs (or naked gills) snails limpets chiton Why so bright? Other characteristics of gastropods • Toxic coloration More characteristics • Toxic harpoon • Killer cone snail Fun videos • Snail egg in leg • Snail zombies Class 2 of 3: Bivalves (or 2 doors) most abundant phyla They include: clams oysters mussels characteristics: 1. Byssal threads with cement Characteristics: 2. Chemoreceptor tentacles 3. Eyes (can you find them?) 4. motility Active bivalves video Class 3 of 3: cephalopods (or head-foot) They include: Nautilus Squid octopus cuttlefish Bulbous octopus “head” is actually its mantle. The Head is small and just around the eyes. Mollusca Characteristics: -motility -eyes -Intelligent, in their own way • • • • • • Camouflage video Chromatophores video Octopuses are smart and squishy Octopus sneaks back to sea Dumbo octopus: really cute Vampire squid: weird Squid Anatomy (male) squid dissection colossal squid dissection interactive
