2.
Phylum Mollusca

3.
Characteristics of Mollusks:

4.
Characteristics of Mollusks: <ul><li>soft bodied </li></ul>

5.
Characteristics of Mollusks: <ul><li>soft bodied </li></ul><ul><li>some have shells and some do not </li></ul>

6.
Snail

7.
Slugs

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>

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>

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>

12.
Clams

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>

14.
The Mantle:

15.
The Mantle: <ul><li>thin membrane surrounding internal organ </li></ul>

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>

17.
Habitat:

18.
Habitat: <ul><li>most are marine, some in freshwater </li></ul>

19.
Habitat: <ul><li>most are marine, some in freshwater </li></ul><ul><li>few on land (only in moist environments) </li></ul>

20.
Mollusk Diversity

21.
Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>

22.
Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>Bivalves

23.
Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>Bivalves Gastropods

24.
Mollusk Diversity <ul><li>Three main classes of mollusks: </li></ul>Bivalves Gastropods Cephalopods

25.
Bivalves

26.
Bivalves <ul><li>two shells </li></ul>

27.
Bivalves <ul><li>two shells </li></ul><ul><li>no distinct head </li></ul>

28.
Bivalves <ul><li>two shells </li></ul><ul><li>no distinct head </li></ul><ul><li>filter feeders </li></ul>

29.
Clamming on the Beach in Oregon

30.
Giant Clams

31.
Scallop

34.
Mussels

35.
Abyssal threads on a mussel

36.
Oyster with Pearl

37.
Gastropods (“stomach foot”)

38.
Gastropods (“stomach foot”) <ul><li>one shell or no shell </li></ul>

39.
Gastropods (“stomach foot”) <ul><li>one shell or no shell </li></ul><ul><li>simple nervous system with small brain </li></ul>

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>

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>

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>

43.
Pacific Northwest Banana Slug

44.
All gastropods have a mouth with Radula

45.
Nudibranchs – poisonous sea slugs

48.
Abalone

52.
Chiton

53.
Chiton on Rock

54.
Chiton

55.
Limpets

57.
Cephalopods (“head foot”)

58.
Cephalopods (“head foot”) <ul><li>the most complex and most recently evolved of all the mollusks </li></ul>

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>

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>

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>

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>

63.
Nautilus shell (the only shelled cephalopod)

65.
Nautilus Eating a Crab

66.
Squid

68.
Giant Squid (7 meters long)

69.
Octopus

70.
Squid & Octopus Defense:

71.
Squid & Octopus Defense: <ul><li>ink to distract predators </li></ul>

72.
Squid & Octopus Defense: <ul><li>ink to distract predators </li></ul><ul><li>most complex form of camouflage of any animal </li></ul>

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>

75.
Octopus camouflage: http://www.youtube.com/watch?v=5rqhomPaxhE&feature=related http://www.youtube.com/watch?v=JJq-wAUmkeg

76.
Is the octopus “intelligent”? http://www.youtube.com/watch?v=T8cf7tPoN5o