1. Invertebrate
Zoology
8 Major Phyla

2. Phylum Arthropoda Means “jointed foot” - all appendages have hinges
Most numerous of all animals
5 major Classes grouped by pairs of legs (1,2,3,4,5)

3. Phylum Arthropoda: Class Chilopoda: Centipedes
1 pair of legs per segment
Fast, carnivores
Many poisonous
(remember “Purple Death”?)

4. Phylum Arthropoda: Class Diplopoda: Millipedes
2 pairs of legs per segment
Slow, herbivore/scavenger of dead plants
Roll into ball for defense

5. Phylum Arthropoda: Class Insecta
3 Pairs of Legs TOTAL
Most numerous and successful of all animals
10 million+??? (75% of all known animals are insects)
Great adaptations

6. Even More Insects

7. Insect Mimic
The Viceroy Butterfly (left) evolved to look like the Monarch Butterfly (right). BOTH species taste bad to birds (the Monarch is poisonous)

8. Insect Mimics

9. Phylum Arthropoda: Class Arachnida: Spiders
4 Pairs of Legs TOTAL
2 Body Segments (head and chest fused)
No antenna
All Make Silk but not all spin webs
Incredible insectivores
Only 2 deadly enough to kill humans in the U.S.
California Trapdoor Spider

10. Phylum Arthropoda: Class Arachnida: Spiders
Black Widow
Brown Recluse

11. Other Arachnids
Deer Tick
Dust Mite
Scorpions

12. Phylum Arthropoda: Subphylum Chelicerata: Class Meristomata: Horseshoe Crabs
Their ancestors date back over 400
million years. They survived mass
extinctions – more related to spiders.

13. Phylum Arthropoda: Subphylum Crustacea
5 Pairs of Legs (or more)
Almost all aquatic
Oldest Arthropod group
Great body segmentation (shows relationship to what group?)
Lobsters, crabs, shrimp
Dog Lobster

14. Other Crustaceans Crayfish Isopod: known as Pill bug or Sow bug.
Isopod: Woodlouse
Copepod

15. Other Crustaceans
King Crab
Barnacles