Many invertebrates are serious pests of agriculture (e.g., mites and locusts), vectors of disease (e.g., mosquitoes and aquatic snails) and venomous (e.g., scorpions), whilst others are beneficial to humans as pollinators, food sources, and detritivores. Despite their obvious ecological, medical, and economic importance, this is the first comprehensive review of invertebrate diseases to be available within a single volume.