Biodiversity can be quite easily defined as the diversity or variety of living organisms on this planet. It has been understood as the measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation or species variation within an area, biome or planet. This book entitled �A new horizons in Biodiversity� consists of 23 chapters. The chapters are mainly focused on the diversity of Molluscs, Planktons, fishes, Crabs, Silkworms, Butterflies, Insects, Crustaceans, Spiders, etc., The authors have put an effort to explain each and every point of respective diversities. This book has been brought to the society, keeping in mind students of graduate and post graduate, research scholars and teaching faculty.