1. INVERTEBRATES
The Silent Majority

2. Did you know?
At least 95% of all animals on this planet are invertebrates
The weight of all earthworms, insects and spiders is 55 times MORE that that of humans!

3. Sponges Scientists used to mistake them for plants.
The simplest invertebrate.
No symmetry
Made up of two cell layers with a jelly-like substance in-between.
Hollow and no bones.

4. Scuba Sponge

5. Vase Sponge

6. Yellow Finger Sponge

7. Dried Sponges

8. Cnidaria Simple animals with a sting.
Australina sea wasp has enough venom to kill 60 people!
Like the sponge, it has 2 cell layers but is more complex.
Has a mouth and …

9. Australia Sea Wasp aka Box Jellyfish

10. Sea Anemone

11. Tealia Anemone

12. Coral

13. Flat Worms The simplest worms
Flat, ribbon-like bodies with a head and tail
No digestive system – some absorb food, others eat food and pass waste through their mouth

14. Marine Worm

15. New Zealand Flat Worm

16. Planarian

17. Tapeworm

18. Round Worms Slender, rounded bodies with pointed ends
About 2,500 species are parasites
One-way digestive system (food comes in through one opening, and out another)

19. The follow pictures may gross you out
The follow pictures may gross you out! If you have a weak stomach, you should probably leave the room…

20. Ew!

21. Double Ew!

22. Hookworm

23. Segmented Worms The most complex worm Blood travels through vessels
3-layer body with bilateral symmetry
One-way digestive system

24. Earthworm

25. Leech

26. Mollusks Soft bodied invertebrates Some live on land, others in water
Most have bilateral symmetry and many organ systems
Most have either one shell, two shells, or an inner shell

27. Slugs and Snails

28. Clams

29. Mussels

30. Nautilus

31. Scallops

32. Oysters

33. Octopus

34. Squid

35. Echinoderms Spiny-skinned animals – most with a star design
Endoskeletons!
Many move and grab things with tiny tube feet

36. Sand Dollars

37. Sea Stars

38. Sea Cucumber

39. Sea Urchin

41. Arthropods The largest invertebrate phylum
Jointed legs, body divided into sections
Some breathe with gills, others with an open-tube breathing system
Exoskeleton! Made of chitin!
We will focus on four major arthropod classes

42. Arthropod class: Arachnids
No antennae
Four pairs of legs, two section body, up to 8 eyes
Lives in a variety of habitats
Most are hunters that eat insects
Many are poisonous!

43. Mites

44. Ticks

45. Daddy-longlegs

46. Spiders

47. Scorpions

48. Everyone’s Favorite Arachnid

49. Arthropod Class: Crustaceans
Jaw-like structures for crushing food and chewing
Two pairs of antennae for sensing
10 or fewer legs, including claws
Sectioned body
Some live on land and others in water
Eat dead animal remains, seaweed, other leftovers

50. Crabs

51. Lobsters

52. Shrimp

53. Barnacles

54. Crayfish

55. Sow Bugs

56. Arthropod Class: Centipedes and Millipedes
Their names can confuse you!
Both have long, thin, segmented bodies
Centipedes have one pair of legs per segments, millipedes have two.
Millipedes’ legs move in a wave-like motion

57. Centipedes

58. Millipedes

59. Arthropod Class: Insects
Head has one pair of antennae
Three pairs of legs; one or two pairs of wings
3 body sections: head, thorax, abdomen
Eats other animals and plants
Special tube system for breathing
Compound eyes made of hundreds of lenses

60. Beetles

61. Flies

62. Bees

63. Ants

64. Mosquito

65. Butterflies

66. Dragonflies

67. Fleas

68. Termites

69. Cockroach

70. The Coral Reef

71. Another Coral Reef