BIOL 112 Chapter Notes - Chapter 15: Tusk Shell, Bivalvia, Cephalopod
Document Summary
Snails, oysters, slugs, mussels, octopus, and squids. Most are slow moving, some are fast (squid and octopus) Freshwater (mussels and snails) or land (snails and slugs) Visceral mass: house all the internal organs. Mantle: responsible for production of the shell, mantle cavity where water and air circulates continuously and gills for gas exchange and gather foot. Use suction produced by foot to attach. Mouth with radula to scrape and grind food. Gills, projections found in the grooves for gas exchange. Use foot to burrow into sand/mud with head first. Mantle tissues are responsible for produce the shell and act at gills to obtain oxygen. Larvae released immediately upon production (so-called planktonic larvae ) Some lost radular, feed only on sucking. Must remain moist active at night. Slime gland secretes thin film of mucus. Moves slowly over this mucus using cilia on muscular foot.
