2. Phylum Arthropoda class Crustacea

3. Largest phylum of animals w/ approx One million known species

4. Includes: insects, spiders, crabs Barnacles, shrimp, & lobsters

5. General characteristics Bilaterally symmetric Have jointed appendages (legs & mouth parts) Exoskeleton made of chitin and hardened by CaCO3 Grow by molting

6. Molting: Old exoskeleton is shed leaving the animal soft The animal brings in water to expand itself A new exoskeleton is secreted by specialized tissue

7. Exoskeleton provides protection, support, & flexibility Also imposes limitations to grow & size

8. Class: Crustacea 30,000 species primarily marine Gill-breathing 16-20 segments Open circulatory system Specialized appendages for food gathering, walking, fighting, defense, etc. Start out life as a planktonic larvae Ex: lobsters, crayfish, shrimp, crabs, copepods, barnacles, etc. Giant King Crab = largest crustacean (~12ft) Heaviest is the lobsters (up to 48 lbs!!)

9. Have two pairs of antennae (one pair smaller than the other) Small, planktonic crustaceans include copepods, barnacles, isopods, krill

10. Barnacles Chitin exoskeleton & secretes CaCO 3 shell. Feathery feet for filter feeding plankton Some attach to docks or boats and a few on whales Must close up with an operculum during low tide to avoid desiccation (drying up).

12. Barnacles and Crabs http://www.youtube.com/watch?v=VKhY- gLGPCk&safety_mode=true&persist_safety_mode=1&safe=active http://www.youtube.com/watch?v=VKhY- gLGPCk&safety_mode=true&persist_safety_mode=1&safe=active Barnacle info http://www.youtube.com/watch?v=49Aev- HA9R4&safety_mode=true&persist_safety_mode=1&safe=active http://www.youtube.com/watch?v=49Aev- HA9R4&safety_mode=true&persist_safety_mode=1&safe=active Giant Crabs http://www.youtube.com/watch?v=aPJ74X_J_- 4&safety_mode=true&persist_safety_mode=1&safe=active http://www.youtube.com/watch?v=aPJ74X_J_- 4&safety_mode=true&persist_safety_mode=1&safe=active Horseshoe Crabs http://www.youtube.com/watch?v=e8KlAmtIu1E&safety_mode=true&persist _safety_mode=1&safe=active http://www.youtube.com/watch?v=e8KlAmtIu1E&safety_mode=true&persist _safety_mode=1&safe=active Molting horseshoe crab http://www.youtube.com/watch?v=Daz8nkh- pWM&safety_mode=true&persist_safety_mode=1&safe=active http://www.youtube.com/watch?v=Daz8nkh- pWM&safety_mode=true&persist_safety_mode=1&safe=active

13. Other larger crustaceans include shrimp, lobsters & crabs Considered decapods (5 pairs of legs) Body consists of cephalothorax (fused head & thorax) & abdomen

15. Crabs have a compact abdomen & a broad cephalothorax Abdomen usually tucked under

17. Male Female

18. Abdomen with eggs

19. Lobsters http://www.youtube.com/watch?feature=endscreen&v=d5uQ317Osxw&N R=1&safety_mode=true&persist_safety_mode=1&safe=active http://www.youtube.com/watch?feature=endscreen&v=d5uQ317Osxw&N R=1&safety_mode=true&persist_safety_mode=1&safe=active Slipper lobster http://www.youtube.com/watch?v=8gBtsboSkOU&safety_mode=true&pe rsist_safety_mode=1&safe=active http://www.youtube.com/watch?v=8gBtsboSkOU&safety_mode=true&pe rsist_safety_mode=1&safe=active Spiny Lobster http://www.youtube.com/watch?v=o2QDJwOIa7s&safety_mode=true&pe rsist_safety_mode=1&safe=active http://www.youtube.com/watch?v=o2QDJwOIa7s&safety_mode=true&pe rsist_safety_mode=1&safe=active Lobster Life Cycle: Safari Montage

20. Giant Spider Crab

21. King and Coconut Crabs