As a sub-part of zoology, invertebrate zoology refers to the study of animals without backbones, commonly called invertebrates. This is a vast category of animals which includes tunicates, sponges, arthropods, worms, echinoderms, molluscs, etc. There are many sub-divisions of this field namely malacology, arthropodology, helminthology, invertebrate paleontology, etc. This book presents the complex subject of invertebrate zoology in the most comprehensible and easy to understand language. It unfolds the innovative aspects of this field which will be crucial for the holistic understanding of the subject matter. For someone with an interest and eye for detail, the text covers the most significant topics in the field of invertebrate zoology.