1. Crustaceans – “Insects of the Sea”
Section 30.4

2. Features of crustaceans
Nauplius – larval stage
Appendages are branched at the ends
Two pairs of antennae
Usually three pairs of chewing appendages
Appendages located on the cephalothorax and abdomen
Respiration through gills

3. Nauplius – the larval stage of crustaceans

4. Habitats Most are marine – crabs, lobster, shrimp
Some are small or microscopic – krill and plankton
Some live in freshwater – crayfish
A few are terrestrial – isopods (roly-poly)

5. Krill

6. Plankton

7. Isopod

8. Decapods Five pairs of walking legs Shrimp, lobsters, crabs, crayfish
Have a cephalothorax
Chelipeds – large pincers in crayfish and lobsters

10. Shrimp

11. Lobster

12. Crabs

13. Crayfish

14. Sessile crustaceans Barnacles attach to a submerged object and remain
Hard plates protect the body
They feed through the open plates

15. Barnacles

16. Barnacles feed through open plates