MOLLUSCA

-Salt water and fresh water -Some terrestrial habitats || -use radula(composed primarily of chitin) to scrape off algae and other food materials -Digestive tract complete and ciliated with a mouth, anus and complex stomach -Food taken up by cells lining the digestive glands, wastes packed and excreted -Excretion carried out by tubes called nephridia || -Blood does not circulate completely within vessels but collected from gills -Hemocoel blood-filled space, replaced by coelom -Cephalopods have closed circulatory system, continuous vessels and accessory hearts that propel blood to gills || -Squid: inner -Octopus, slug: none || -External fertilization -Snails are hermaphrodites || -some have well-developed eyes || -gastropods have small brains -cephalopods have highly organized brains and well-developed sense organs || -food for humans -can be used as fishing bait -dyes, pearls -some are pests (slugs, snails, oyster drills) || foot + visceral mass + mantle ||
 * =**Phylum**= || Angela, Luc ||
 * **1 Examples** || Squids, Clams, Octopus, Snails, Slugs ||
 * **2 Habitats** || Mainly Marine
 * **3 Mode of feeding, digestive, excretory** || -algae
 * **4 Internal Transport****(circulation & respiration)** || - Excluding Cephalopods, have an open circulatory system
 * **5 Symmetry & Support,**===Locomotion, body covering=== || -Bilateral, most outer shell
 * **6 Fertilization &Reproduction****(sexual/ asexual)** || -Sexual only; separate sexes
 * **7 Body Forms (life stage forms)** || trochophore(cilitated larva)-->veliger larva-->adult ||
 * **8 Defense / senses/ response to environment** || -some can change body color in response to stimuli (pigment is called chromatophores)
 * **9 Nervous system** || -have series of ganglia that conduct impulses
 * **10 Importance (how it fits into****the world)** || -whales eat squids
 * **Misc.** || three main parts: