1. Classes of Arthropods

2. Dichotomous Key

3. Anatomy Compound Eye Head Thorax Ocelli Abdomen Abdomen Cephalothorax
Antennae
Abdomen
Cephalothorax

4. Arachnida Antennae absent Spiders, ticks, mites, scorpions, etc.

5. Black Widow Spider

6. Brown Recluse Spider

7. Crustacea Two pair of antennae present Crawfish, crabs, sowbugs, etc.
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8. Insecta One pair of antennae Three pairs of legs
Beetles, butterflies, bees, etc.

9. Chilopoda Many pairs of legs with one pair of legs per body segment
Poisonous fangs at end of body
Centipedes

10. Diplopoda Many pairs of legs with two pairs of legs per body segment
Millipedes