1. ARTHROPODS: Jointed-Legged Invertebrates
TSW describe the characteristics of arthropods that inhabit the marine environment

2. 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 4 Subphyla Trilobitomorpha (ALL extinct) Chelicerata
Crustacea
Uniramia

6. CHELICERATA Mouth parts called Chelicerae
Two body sections (cephalothorax & abdomen)
Most have 4 pairs of walking legs
EX. Horseshoe crabs

7. VENTRAL VIEW

8. DORSAL VIEW

9. CRUSTACEA 2 pairs of antennae 2 or 3 body sections
Chewing mouthparts called Mandibles
EX. Shrimp, lobsters, crayfish, water fleas, fairy shrimp, brine shrimp, & barnacles

11. NERVOUS SYSTEM Johnstons Organs: Hearing, on antennae
Tympanic Organs: Hearing, on legs & body
Compound Eyes: Facets, ommatidia (fused)
Simple Eyes: Ocelli

12. Economic Impact Food Symbionts…what does this mean?
Recycling & Fouling