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The first edition of Invertebrate Zoology offers undergraduates studying the biology and evolution of invertebrate animals a new approach to the subject. While the text of this second edition has been revised _ significantly, the original format has been maintained and enhanced. Thechapters, written by expert authors, provide contemporary accounts of the functional, physiological, and reproductive biology of the invertebrate phyla. The final chapter of the book reviews modern interpretations of the phylogeny of invertebrates, based on cladistic and molecular evidence. Thestudy of invertebrates has advanced rapidly in recent years, and several major changes are highlighted in this new edition. Separate chapters now reflect the recognition that the former 'aschelminths'include two disparate groups of phyla, a protosome group related to annelids nad molluscs, and anecdysozoan group related to arthropods. All classifications have been updated and the relationships among the phyla have been further clarified. Generously illustrated throughout, and with an emphasis on readability and clear presentation, this book will be a valuable resource for all students ofinvertebrate zoology as well as for those involved in current advances in the biological sciences.