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Mollusk Life Cycle. Most mollusks are dioecious (separate sexes) Some are hermaphroditic The life cycle of many mollusks includes a free swimming, ciliated larval stage called a TROCHOPHORE. Major Mollusk Classes. Four major classes of mollusks: Class Polyplacophora – the chitons

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mollusk life cycle
Mollusk Life Cycle
  • Most mollusks are dioecious (separate sexes)
  • Some are hermaphroditic
  • The life cycle of many mollusks includes a free swimming, ciliated larval stage called a TROCHOPHORE
major mollusk classes
Major Mollusk Classes
  • Four major classes of mollusks:
    • Class Polyplacophora – the chitons
    • Class Gastropoda – snails & slugs
    • Class Bivalvia – clams, mussels, oysters
    • Class Cephalopoda – octopus & squid
class polyplacophora
Class Polyplacophora
  • Includes the chitons
  • Eight overlapping shell plates
  • Can roll up
  • All marine
  • Use radula to scrape algae off rocks.
class gastropoda
Class Gastropoda
  • largest of the mollusk classes
  • 70,000+ named species
  • Include snails, slugs, nudibranchs (sea slugs), sea butterfly
  • Marine, freshwater, terrestrial
  • Creep along using foot
class gastropoda1
Class Gastropoda
  • The shell of a gastropod is always one piece, called a valve.
  • Gastropods are considered univalves
class gastropoda2
Class Gastropoda
  • Many snails can withdraw into the shell and close it off with a lid called an operculum.
class gastropoda3
Class Gastropoda
  • Nudibranchs are sea slugs
    • Do not have shell
    • Have colorful branches of gut or gills exposed
    • Prey on sponges, cnidarians, & other invertebrates
    • May produce noxious chemicals
gastropod feeding habits
Gastropod Feeding Habits
  • Most gastropods are herbivores and feed by scraping algae off of rocks using the radula.
  • Some (like nudibranchs) are carnivores