The trematodes are parasitic flatworms of great medical and veterinary importance. An understanding of the evolution of trematodes depends on an interpretation of their complex and diverse life cycles. It is the life cycles in general and the stages that comprise these cycles that are the focus of the detailed analysis presented herein. The book contains a broad scope of modern information on digenetic trematodes, from descriptions of their morphology and development to their behaviour and the structure of their populational groups. The book provides information on all characteristics of...