Contents: 1. Introduction. 2. External morphology. 3. Nervous system. 4. Digestive system. 5. Excretory system. 6. Respiratory system. 7. Reproduction. 8. Classification. 9. Literature review. 10. Material and methods. 11. Methodology. 12. Results. 13. Systematic accounts: i. Mantis shrimps. ii. Shrimps. iii. Lobsters. iv. Porcelain crabs. v. Crabs. Discussion. References. Online resources. Index.