1. Jointed-legged invertebrates
Arthropods
Jointed-legged invertebrates

2. Arthropod Characteristics
Chitinous exoskeleton
Paired-jointed appendages
Growth with ecdysis (molting)
Open circulatory system
Complete digestive tract

3. Exoskeleton Major reason for success! Provides Support Protection
Prevention of dehydration
Sites for muscle attachment

4. Metamorphosis
Change body form from immature (larval) stages to adult forms
Reduces competition between stages for
Food
Living space

5. Taxonomy of Arthropods
4 subphyla
Trilobitomorpha (all extinct)
Chelicerata
Crustacea
Uniramia

6. Chelicerata
Horseshoe crabs
Spiders
Mites
Ticks
Scorpions

7. Crustacea Shrimp, lobsters, crayfish Fairy shrimp, brine shrimp
Water fleas
Barnacles

8. Uniramia Class Diplopoda (millipedes) Class Chilopoda (centipedes)
Class Hexapoda (insects)

9. Nervous System Johnston’s organs (hearing - on antennae)
Tympanic organs (hearing – on legs or body)
Compound eyes (facets – ommatidia – fused)
Simple eyes (ocelli)

10. Economic Impact of Arthropods
Name one effect each major group has on mankind (good or bad).
For insects, list 4 good things that they do and 4 bad things that they are responsible for.