1. Mollusks
3 classes: Gastropods,
bivalves, and cephalopods

3. Gastropods: slugs and snails

4. Gastropods: slugs and snails

5. Gastropods: slugs and snails

6. Gastropods: slugs and snails

7. Gastropods: slugs and snails

8. Gastropods: slugs and snails

9. Bivalves: clams, 2 shelled mollusks

10. Bivalves: clams, 2 shelled mollusks

11. Bivalves: clams, 2 shelled mollusks

12. Bivalves: clams, 2 shelled mollusks

13. Bivalves: clams, 2 shelled mollusks

14. Cephalopods:
Squids and octopuses

15. Cephalopods:
Squids and octopuses

16. Cephalopods:
Squids and octopuses

17. Cephalopods:
Squids and octopuses

18. Cephalopods:
Squids and octopuses

19. Cephalopods:
Squids and octopuses

20. Facts:

21. Facts:
1. MOST live in the ocean, SOME in fresh
water and/or land

22. Facts:
1. MOST live in the ocean, SOME in fresh
water and/or land
2. 1mm to giant squid 18m

23. Facts:
1. MOST live in the ocean, SOME in fresh
water and/or land
2. 1mm to giant squid 18m
3. Most are slow–- except squid, 40km/h
and 4m out of water

24. Facts:
1. MOST live in the ocean, SOME in fresh
water and/or land
2. 1mm to giant squid 18m
3. Most are slow–- except squid, 40km/h
and 4m out of water
4. Bodies are alike

27. • Foot: uses to move

28. • Foot: uses to move
• Visceral mass: contains organs

29. • Foot: uses to move
• Visceral mass: contains organs
• Mantle: covers organs, protects mollusks
without a shell

30. • Foot: uses to move
• Visceral mass: contains organs
• Mantle: covers organs, protects mollusks
without a shell
• Shell: Most mollusks -- secreted by the
mantle

31. Eating!

32. Eating!
• Clams: filter water

33. Eating!
• Clams: filter water
• Snails and slugs: radula—ribbon-like
tongue with curved teeth

34. Eating!
• Clams: filter water
• Snails and slugs: radula—ribbon-like
tongue with curved teeth
• Cephalopods: catch prey with tentacles

35. Heart!

36. Heart!
• Open circulatory system--gastropods and
bivalves

37. Heart!
• Open circulatory system--gastropods and
bivalves
– Heart pumps blood into open spaces in
animal’s body

38. Heart!
• Open circulatory system--gastropods and
bivalves
– Heart pumps blood into open spaces in
animal’s body
• Closed circulatory system--cephalopods

39. Heart!
• Open circulatory system--gastropods and
bivalves
– Heart pumps blood into open spaces in
animal’s body
• Closed circulatory system--cephalopods
– Heart pumps blood through blood vessels

40. Brain!

41. Brain!
• Mollusks have nerves throughout body
control--breathing, eating and moving

42. Brain!
• Mollusks have nerves throughout body
control--breathing, eating and moving

43. Brain!
• Mollusks have nerves throughout body
control--breathing, eating and moving
• Cephalopods have more complex nervous
system
– Most advanced of all invertebrates

44. Brain!
• Mollusks have nerves throughout body
control--breathing, eating and moving
• Cephalopods have more complex nervous
system
– Most advanced of all invertebrates
– Smartest invertebrate

45. Words and pictures for
dichotomous Mollusk Key
The edges The grooves
of this leaf on this shell
are are radiating
serrated
The grooves
on this shell
are circular

46. Right-handed and left-handed
mollusks

47. This shell
Oblong has teeth
shape on either
side of the
Round opening
shape
This object This shell
has a looks
conical inflated
shape

48. Canal
Long spire short spire
No
protrusions
Protrusion
or nodules
Canal