Mollusks bivalves:gastro:cepha marine

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Mollusks bivalves:gastro:cepha marine

  1. 1. Phylum Mollusca Class: Gastropoda Class: Bivalvia Class: Cephalopods
  2. 2. Class GastropodaSnails, Limpets and Slugs
  3. 3. Gastropoda• Planning on being rich and famous?• Wining and dining at the most expensive restaurants?• Romantic trips to Paris?• Ever wonder what Ceaser munched on after long hard days ruling the roman empire?• Than you should be familiar with ESCARGOT!!!!
  4. 4. General Body Plan: Gastropod• 1. Head foot• Head: sensory nerves, mouth – Anterior: near the head/ mouth• Foot: attachment and locomotion – Posterior: near the anus – Flattened w Cilia: locomotion
  5. 5. That slimy foot…• Snail Slime: – Suction power: travel up and down trees – Escape: Emit a nasty tasting slime when threatened – Movement: Allows them to easily squeeze through tight spaces – Water Retention• How Ms. Cota looks so young: – Skin regenerating – used in skin beauty products
  6. 6. General Body Plan of mollusks• 2. Visceral Mass – Organs of digestion – Circulation – Reproduction – Excretion – Dorsal to the head foot
  7. 7. General Body Plan: Gastropod• Mantle (shell) – Attached to visceral mass • Encloses most of the body – Protection• Mantle Cavity: – Gas exchange – Elimination of digestive wastes – Release of reproductive products
  8. 8. Respiration• One Gill in mantle cavity – Oxygen is taken in – Diffused through the cells• Open Circulatory System – Pushes blood in to expand – Pulls it out to contract
  9. 9. General Body Plan: Mollusca• Radula: Scraping mouth – Chitinous belt & curved teeth • Covers fleshy tongue • Muscles move it back and forth • Conveyor belt• Digestion – Scrape algae – Enzymes break down food in stomach
  10. 10. CFU• How do mollusks exchange gasses – Filter air through their gills• Where are these gills located? – The mantel• What is the structure called that scrapes up food? – A Radula• All mollusks have: – A visceral Mass – A head foot – A mantel
  11. 11. Reproduction• Monoecious: can be whatever sex they want! – Internal cross fertilization – One snail acts as female one acts as male – Deposit eggs in gelationous strings
  12. 12. Class BivalviaClams, Oysters, Mussles, Scallops
  13. 13. Bivalvia!• Edible• Commercial value: Form Pearls• Valuable in removing bacteria from polluted water! – Rely on water currents to get food – Filter in nutrients, filter out clean water• Valuable food source: humans, raccoons, otters, birds
  14. 14. Structure• Two halves of a shell: Valves – Adductor muscles hold valves shut• Visceral Mass• Mantel Cavity• Gills• Cilia• Siphon: – filters water in and out of shell
  15. 15. Foot• Most mollusks have foot that can be used differently – Attach mollusk to surface – Act as a lure to attract prey – Surround organs for safety
  16. 16. Respiratory System• Respiration and digestion: – Incurrent siphon and gills
  17. 17. CFU• What is the technical term for the two halves of the shell? – Valves• What structure filters water in and out of the shell – Siphon• What is the function of the foot – Attach mollusk to substrate, act as lure• Why are bivalves important to humans? – Pearls, food source, pollution filter• How are humans affecting bivalves? – Over harvesting, pollution, loss of current
  18. 18. Mollusks: Cephalopods Octopus, Squid, Cuttlefish
  19. 19. Cephalopods• Fierce Predators – Large brains – Complex sensory structures – Rapid locomotion – Grasping tentacles• Octopus vs. Shark
  20. 20. Locomotion• Jet like propulsion out of mantle – Squid: uses it for catching prey • Up to 25 mph! – Squid catching cameras. – Octopus: escape method
  21. 21. Nervous/Sensory System• Very large brain – Dedicated to movement/control of tentacles – Very smart: octopus are known to problem solve – Curious• Giant Octopus• Octopus Opening lid• Eyes: advanced, similar to vertebrate eyes – Convergent evolution
  22. 22. Predator Adaptations• Locate prey by sight• capture prey w tentacles/ suction cups – Tentacles reinforced w protein• Eat using a radula – Cuttlefish: small invertebrates – Octopus: • Nocturnal: snails, fish, crustations
  23. 23. Predator Adaptations• Chromatophores – Cells that can change colors• Tiny muscles contract or expand and chromatophores quickly change color – Alarm response – Defensive – Blend in w environment – Courtship – Bioluminescence• Cuttlefish in love

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