1. Horseshoe crab Video Horseshoe Crab Video

3. Phylum Arthropoda Class Crustacea Organisms that are Crustaceans:
Barnacles
Krill
Shrimp, crabs and lobsters
Horseshoe crabs

4. Anatomical Structures
Segmented Body
Bilaterally Symmetrical
Jointed appendages
Chitinous Exoskeleton made of CaCO3
2 Pair of Antennae

5. Barnacles -Small Crustaceans
Attach to surface
Plated- heavy CaCO3
Upper plate opens
Filter feeder-
Uses legs to filter water

6. Krill
Planktonic
Shrimp-like
Filter Feeders
School in the billions

7. Large Crustaceans- sub class Decopoda
5 pairs walking legs
1st heavier Pinchers
Obtain Food and Defense
Shell- Carapace
2 sections
Cephalothorax - Head and Legs
Abdomen – Swimmerettes and Tail

8. Shrimp and Lobster Elongated Abdomen
Shrimp and lobsters are scavengers

9. Crayfish
Related to the lobster
Both marine and freshwater

10. Crabs
Compact, Broad Cephalothorax
Moves – Side to side
Scavengers

11. How can you tell males from females?
Male –Flat V shaped plate
Female –Expanded U shaped plates
To carry eggs

12. Horseshoe-shaped carapace 5 pairs of legs
Horseshoe Crab
Living Fossils
Live in shallow water
Horseshoe-shaped carapace
5 pairs of legs