The purpose of this book is to provide an overview of the biology of the planorbid snail Biomphalaria glabrata mainly as related to the snail’s role as a host of larval trematodes . This snail is of great importance in medical and economic zoology as a vector of important trematode (fluke) diseases in human and veterinary medicine and in wildlife biology. Moreover, this snail is a useful model for numerous basic studies in biology and chemistry. A book that provides modern coverage of diverse topics from the molecule to the community of this snail as related to larval trematode parasitism is not available. This book should appeal to a wide audience of biologists, ecologists, biochemists, malacologists, parasitologists, public health workers, epidemiologists, and graduate and advanced undergraduate students in biomedical and allied health sciences.