Crustaceans – “Insects of the Sea”

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