1. Phylum Arthropoda “jointed feet”

2. Basic Info Largest of all Phyla Include: –Insects –Arachnids –Crustaceans

3. Characteristics Segmented Body with Appendages on each segment

4. Dorsal heart and ventral nervous system

5. Covered by a hard exoskeleton –Less prone to dehydration –Made of chitin –Molts periodically due to growth Molting of a black crab

6. Common Crustaceans True Crabs Five visible pairs of legs Abdomen folded under cephalothorax 7-11 crab, found wedged in rocks A’ama, black crab Box crabs

7. Female Male

8. Hermit Crabs Salvage empty shells for homes Protect soft abdomens Some hermit crabs work cooperatively with other organisms (sea anemones attached above) Common Hawaii tidepool hermit crab

9. Lobsters Abdomen with swimmerets Spiny lobster Slipper lobster Hawaiian lobster

10. Barnacles “curl footed”, to capture food Larvae cements its head down Grow armor plates to protect body

11. Symbiosis with Arthropods Working together, pom pom crab and sea anemones, teddy bear crab with anemones, cleaner shrimp with eel

12. Best of friends, goby and the blind shrimp. Shrimp digs the hole, and the goby becomes the shrimps “eyes” for defense and gets leftover food. Sponge crab uses sponge for self defense and sponge gets to move to new food.