| Chapter No. | Chapter Title | Chapter Author | Page No. |
| Chapter-1 | Introduction | | 1 |
| Chapter-2 | Introduction to Chemical Messenger System | | 13 |
| Chapter-3 | Overview of the Invertebrate Endocrinology | | 17 |
| Chapter-4 | Basic Concepts on Hormones and the Endocrine System | | 27 |
| Chapter-5 | Development and Evolutionary Perspectives of the Neuro-endocrine System of Invertebrates | | 45 |
| Chapter-6 | Hormones of the Cnidarians | | 67 |
| Chapter-7 | Hormones in the lives of crustaceans: An Overview | | 83 |
| Chapter-8 | Hormones of the Insects | | 89 |
| Section-I hormones of the Insects | | 89 |
| Section-II Insect's Endocrine System | | 94 |
| Section-III Classification of Insect Hormones | | 103 |
| Section-IV Protohormones | | 108 |
| Section-V Juvenile Hormone (JH) | | 111 |
| Section-VI Ecdysteroid or Ecdysone or Moulting Hormone (MH) | | 131 |
| Section-VII Neurohormones | | 143 |
| Section-VIII Exohormone | | 153 |
| Section-IX Insect Endocrines: An Intergrated System | | 158 |
| Section-X Evolution of the Endocrine System | | 165 |
| Section-XI Insect Hormones and Pest Management | | 169 |
| Chapter-9 | Prostaglandins | | 173 |
| Chapter-10 | pheromones | | 193 |
| Chapter-11 | Nitric Oxide Signaling in Biological Systems | | 219 |
| Chapter-12 | Evolution of Chemical Messengers | | 233 |
| Glossary | | 247 |
| Bibliography | | 255 |
| Index | | 263 |
