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Chapter 29: Mollusks and Annelids

Chapter 29: Mollusks and Annelids. What is a mollusk? What is an annelid?. Mollusks. Objectives :. Describe the skeletal structure, fertilization, reproduction, body symmetry, body coverings and locomotion for the Phylum Mollusca and Phylum Annelida

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Chapter 29: Mollusks and Annelids

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  1. Chapter 29: Mollusks and Annelids What is a mollusk? What is an annelid?

  2. Mollusks

  3. Objectives: • Describe the skeletal structure, fertilization, reproduction, body symmetry, body coverings and locomotion for the Phylum Mollusca and Phylum Annelida • This will be completed through spreadsheet notes…..

  4. How are annelids and mollusks related? • Both were the first major groups of animals to develop: • true coelom. – they have a body cavity, the gut and the rest of the organs are cushioned by the fluid in the coelom. • trocophore: a larval stage develops from egg, in some species it is free swimming and propels itself with cilia.

  5. Trochophore: Free swimming larval stage of mollusks and annelids

  6. Seven classes of mollusks make up phylum Mollusca • Three largest classes and examples are: • Gastropods- snails and slugs • Bivalvia- clams, oyster, and scallops • Cephalopoda- octopuses and squids

  7. Know the 6 Key Characteristics of Mollusks • 1. Body cavity: true coelom • 2. Symmetry: bilateral symmetry • 3. Three-part body plan: visceral mass- central part, mantle- outer layer of body, foot- muscular region used for locomotion • 4. Organ systems- excretion, circulation, respiration, digestion, reproduction • 5. Shell- one or two shells (most) • 6. Radula- tongue like organ in the mouth, thousands of teeth on radula scrap off food and pull in prey.

  8. Mollusk - Gastropods Examples: snails,slugs

  9. Fertilization and Reproduction for Gastropods: same as mollusks

  10. Body symmetry of gastropods is bilateral

  11. Body coverings of gastropods are a mantle of tissue covering the body, spiral shells

  12. Locomotion of Gastropods:"foot", secretes mucus it glides on

  13. Bivalves:Examples: clams, oysters, scallops (all the notes for the next 6 slides are in the bivalve row)

  14. Bivalve skeletal structure: • All have two part hinged shell Giant clams can weigh more than 227 kilograms (500 pounds), and are the largest bivalve mollusk in the world.

  15. Fertilization and Reproduction of Bivalves: sexually, release sperm and egg into water, fertilized eggs become trocophore larvae

  16. Important features of Bivalves: filter feeders, through siphon tube, over gills out other siphon tube

  17. Body symmetry of bivalves is bilateral

  18. Body coverings of bivales: two part hinged shell, two thick adductor muscles connect shells

  19. Locomotion of bivalves: most sessile, some swim opening/closing valves quickly

  20. Cephalopod examples: squids, octopuses, cuttlefish, nautilus

  21. Cephalopod skeletal structure:large head attached to tentacles, lack external shell,

  22. Cephalopod reproduction: Sexual

  23. Cephalopod body symmetry: bilateral

  24. Cephalopod body coverings: only nautilus has shell

  25. Cephalopod locomotion: jet propulsion

  26. Annelids:

  27. Important features of annelids:respire through skin, have closed circulatory system, complex nervous system

  28. Body symmetry of Annelids: bilateral

  29. Body coverings of annelids: setae: bristles, some have parapodia: fleshy appendages

  30. Body coverings of annelids: setae: bristles, some have parapodia: fleshy appendages

  31. Locomotion of annelids: fluid filled compartment aids with contracting, stretching to move

  32. Marine worms: Examples feather dusters, Nereis

  33. Marine worm skeletal structure: Many parapodia

  34. Marine Worm Reproduction: Hermaphrodites, sexual

  35. Marine worm special features:some burrow, others live in protective tubes, some feed by pumping water through body

  36. Body symmetry of Marine worm: Bilateral

  37. Body coverings and locomotion of marine worms: many parapodia, use parapodia to swim, burrow or crawl

  38. Earthworms skeletal structures: no parapodia, only setae

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