Arthropoda

1. 5 Classes

1.1. Chilopoda

1.1.1. Centipedes

1.1.2. Flattened long bodies

1.1.3. 1 pair of legs per segment

1.1.4. Poison Fangs/Claws

1.1.5. Simple eyes

1.1.6. 1 pair of antennae

1.1.7. Some Carnivore + some herbivore

1.2. Diplopoda

1.2.1. Millipedes

1.2.2. Long rounded bodies

1.2.3. 2 pair of legs per segment

1.2.4. 1 pair of antennae

1.2.5. For defense roll into a ball/spiral + smell bad

1.3. Arachnida

1.3.1. Spiders and scorpions and ticks

1.3.2. 2 tagnata

1.3.2.1. Cephalothorax + abdomen

1.3.3. 4 pairs of legs

1.3.4. Webs

1.3.5. Chelicerae for biting/tearing

1.3.6. No antennae

1.3.7. Pedipalps - Multipurpose tools

1.3.8. Simple to complex eyes, various #'s

1.3.9. Scorpions have stingers

1.4. Hexapoda (Insects)

1.4.1. 3 pairs of legs

1.4.2. 3 tagmata

1.4.2.1. Head

1.4.2.2. Thorax

1.4.2.3. Abdomen

1.4.2.4. Bees, butterflies, wasps, beetles etc.

1.4.3. 1 pair of antennae

1.4.4. 2 pair of wings

1.4.5. Communication

1.4.5.1. Pheromones

1.4.5.2. Dances

1.4.6. Complete Metamorphosis

1.5. Crustacea

1.5.1. 2 pair of antennae

1.5.2. 2 tagmata

1.5.2.1. Cephalothorax

1.5.2.2. Abdomen

1.5.3. Crabs, lobster, krill, crayfish, shrimp, isopods, and barnacles

1.5.4. Swimmerets for swimming

1.5.5. Eyes are on stocks

2. Medical

2.1. Vector for Disease

2.2. Parasites

2.3. Genetic Studies

2.4. Forensics

3. Environmental

3.1. Food Webs

3.2. Recycle Nutrients

3.3. Invasive Species

3.4. Pollination

4. Biggest Phylum in Animal Kingdom

5. Everywhere. Air, land, fresh water, marine

6. General Characteristics

6.1. Jointed Appendages

6.2. Exoskeleton

6.3. Triploblastic

6.4. Metamerism

6.5. Coelomate

6.6. Protostome

6.7. Tagmata

6.8. Bilateral symmetry

6.9. Cephalization

7. "Jointed Foot"

8. Economic

8.1. Food Source

8.2. Competitions & Shows

8.3. Insecticides

8.4. Compete for crops

8.5. Candles & Beeswax products