Digestive system
– Toothed belted----radula-----Scraping food
• Circulatory
– Open circulatory system
– Most blood contain respiratory pigment
– Hemocyanin
– Copper compound
• O2---blue
• Deoxygenated---colorless
– Muscular heart
• Excretion
– Metanephridia
– Through body and gill surface
• Reproduction
– sexual