Mollusks

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a brief overview of mollusks for an introductory class

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  • Society for the Legitimazation of the Ubiquitous Gastropod
  • Mollusks

    1. 2. Phylum Mollusca
    2. 3. Characteristics of Mollusks:
    3. 4. Characteristics of Mollusks: <ul><li>soft bodied </li></ul>
    4. 5. Characteristics of Mollusks: <ul><li>soft bodied </li></ul><ul><li>some have shells and some do not </li></ul>
    5. 6. Snail
    6. 7. Slugs
    7. 8. Characteristics of Mollusks: <ul><li>soft bodied </li></ul><ul><li>some have shells and some do not </li></ul><ul><li>first organism on earth with complete organ system </li></ul>
    8. 9. Characteristics of Mollusks: <ul><li>soft bodied </li></ul><ul><li>some have shells and some do not </li></ul><ul><li>first organism on earth with complete organ system </li></ul><ul><li>a coelom </li></ul>
    9. 10. Characteristics of Mollusks: <ul><li>soft bodied </li></ul><ul><li>some have shells and some do not </li></ul><ul><li>first organism on earth with complete organ system </li></ul><ul><li>a coelom </li></ul><ul><li>two body openings (mouth & anus) </li></ul>
    10. 12. Clams
    11. 13. Characteristics of Mollusks: <ul><li>soft bodied </li></ul><ul><li>some have shells and some do not </li></ul><ul><li>first organism on earth with complete organ system </li></ul><ul><li>a coelom </li></ul><ul><li>two body openings (mouth & anus) </li></ul><ul><li>all have a special organ called a mantle </li></ul>
    12. 14. The Mantle:
    13. 15. The Mantle: <ul><li>thin membrane surrounding internal organ </li></ul>
    14. 16. The Mantle: <ul><li>thin membrane surrounding internal organs </li></ul><ul><ul><li>secretes the shell material if there’s a shell </li></ul></ul>
    15. 17. Habitat:
    16. 18. Habitat: <ul><li>most are marine, some in freshwater </li></ul>
    17. 19. Habitat: <ul><li>most are marine, some in freshwater </li></ul><ul><li>few on land (only in moist environments) </li></ul>
    18. 20. Mollusk Diversity
    19. 21. Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>
    20. 22. Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>Bivalves
    21. 23. Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>Bivalves Gastropods
    22. 24. Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>Bivalves Gastropods Cephalopods
    23. 25. Bivalves
    24. 26. Bivalves <ul><li>two shells </li></ul>
    25. 27. Bivalves <ul><li>two shells </li></ul><ul><li>no distinct head </li></ul>
    26. 28. Bivalves <ul><li>two shells </li></ul><ul><li>no distinct head </li></ul><ul><li>filter feeders </li></ul>
    27. 29. Clamming on the Beach in Oregon
    28. 30. Giant Clams
    29. 31. Scallop
    30. 34. Mussels
    31. 35. Abyssal threads on a mussel
    32. 36. Oyster with Pearl
    33. 37. Gastropods (“stomach foot”)
    34. 38. Gastropods (“stomach foot”) <ul><li>one shell or no shell </li></ul>
    35. 39. Gastropods (“stomach foot”) <ul><li>one shell or no shell </li></ul><ul><li>simple nervous system with small brain </li></ul>
    36. 40. Gastropods (“stomach foot”) <ul><li>one shell or no shell </li></ul><ul><li>simple nervous system with small brain </li></ul><ul><li>only mollusk found on land </li></ul>
    37. 41. Gastropods (“stomach foot”) <ul><li>one shell or no shell </li></ul><ul><li>simple nervous system with small brain </li></ul><ul><li>only mollusk found on land </li></ul><ul><ul><li>most terrestrial ones are hermaphrodites </li></ul></ul>
    38. 42. Gastropods (“stomach foot”) <ul><li>one shell or no shell </li></ul><ul><li>simple nervous system with small brain </li></ul><ul><li>only mollusk found on land </li></ul><ul><ul><li>most terrestrial ones are hermaphrodites </li></ul></ul><ul><li>snails, slugs, abalone, chitons, limpets </li></ul>
    39. 43. Pacific Northwest Banana Slug
    40. 44. All gastropods have a mouth with Radula
    41. 45. Nudibranchs – poisonous sea slugs
    42. 48. Abalone
    43. 52. Chiton
    44. 53. Chiton on Rock
    45. 54. Chiton
    46. 55. Limpets
    47. 57. Cephalopods (“head foot”)
    48. 58. Cephalopods (“head foot”) <ul><li>the most complex and most recently evolved of all the mollusks </li></ul>
    49. 59. Cephalopods (“head foot”) <ul><li>the most complex and most recently evolved of all the mollusks </li></ul><ul><li>most complex nervous system of all invertebrates (highly organized brain) </li></ul>
    50. 60. Cephalopods (“head foot”) <ul><li>the most complex and most recently evolved of all the mollusks </li></ul><ul><li>most complex nervous system of all invertebrates (highly organized brain) </li></ul><ul><ul><li>all have complex eyes that see images </li></ul></ul>
    51. 61. Cephalopods (“head foot”) <ul><li>the most complex and most recently evolved of all the mollusks </li></ul><ul><li>most complex nervous system of all invertebrates (highly organized brain) </li></ul><ul><ul><li>all have complex eyes that see images </li></ul></ul><ul><li>propel themselves backwards with jets of water </li></ul>
    52. 62. Cephalopods (“head foot”) <ul><li>the most complex and most recently evolved of all the mollusks </li></ul><ul><li>most complex nervous system of all invertebrates (highly organized brain) </li></ul><ul><ul><li>all have complex eyes that see images </li></ul></ul><ul><li>propel themselves backwards with jets of water </li></ul><ul><li>includes squid, octopuses, the chambered nautilus </li></ul>
    53. 63. Nautilus shell (the only shelled cephalopod)
    54. 65. Nautilus Eating a Crab
    55. 66. Squid
    56. 68. Giant Squid (7 meters long)
    57. 69. Octopus
    58. 70. Squid & Octopus Defense:
    59. 71. Squid & Octopus Defense: <ul><li>ink to distract predators </li></ul>
    60. 72. Squid & Octopus Defense: <ul><li>ink to distract predators </li></ul><ul><li>most complex form of camouflage of any animal </li></ul>
    61. 73. Squid & Octopus Defense: <ul><li>ink to distract predators </li></ul><ul><li>most complex form of camouflage of any animal </li></ul><ul><li>intelligence ??? </li></ul>
    62. 75. Octopus camouflage: http://www.youtube.com/watch?v=5rqhomPaxhE&feature=related http://www.youtube.com/watch?v=JJq-wAUmkeg
    63. 76. Is the octopus “intelligent”? http://www.youtube.com/watch?v=T8cf7tPoN5o

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