1. Crabs, Shrimp and other Arthropods Chapter 10.2-10.4

2. Crabs Crabs are one of the most widely spread animals living EVERYWHERE – they live on land, in freshwater and in the sea from shore areas, to surface waters, to the great ocean depths.

3. Diagram of the Crab

4. Crab Diversity Fiddler crab – digs tunnels in the sand along shores of bays and inlets. Mole crab – lives in the turbulent surf zone along sandy beaches Hermit crab – has a soft abdomen and must find empty snail shells to live in Spider crab – can grow to 13 feet from leg tip to leg tip and lives at ocean depths

5. Crab Life Functions Much of what the crab does is identical to the lobster. Differences include that crabs’ abdomens are folded between their legs and they have no tail.

6. Crab Sex Pregnant or “Spongy” Crab

7. Blue Porcelain Crab

8. Coconut Crab

9. Fiddler Crab

10. Giant Spider Crab

11. Hermit Crab

12. King Crab

13. Mole Crab

14. Snow Crab “Opelio”

15. Tasmanian Giant Crab

16. Other Crustaceans Shrimp are basically small versions of a lobster. –Pink Gulf shrimp, shore shrimp, cleaning shrimp, mantis shrimp Copepods and krill are almost microscopic and make up much of the zooplankton Amphipods and isopods live near the oceans’ edges sometimes on a substrate Barnacles are sessile and live in the intertidal zone

17. Barnacles must continually be removed

18. Horseshoe Crabs Not a true crab – Class Merostomata More closely related to spiders and scorpions Has many eyes Mates in estuaries like the Delaware Bay and timing is determined by moon. Has book gills and a telson Eggs are a vital source of migratory shore bird food.

19. Horseshoe Crab

21. Mating

22. More Mating

23. “Green Eggs and Sand”

24. Baby Horseshoe Crab

25. Marine Insects Pretty much biting insects that live near land –mosquitoes, biting flies (green head and horse fly), sand-fly (“no see-um”) –May transmit disease Not found in high salinity areas or open ocean

26. Marine Insects