Quentin D. Wheeler is professor of systematics in the Department of Entomology and Liberty Hyde Bailey Hortorium at Cornell University and is a research associate in entomology at the American Museum of Natural History. Rudolf Meier is associate professor and curator in the Department of Entomology at the Zoological Museum, Copenhagen.

This is an important and valuable book, with the arguments coming straight from the horses' mouths. Even if readers do not change their minds, they will at least be better informed in their prejudices. Biologist This book focuses on the numerous controversies in phylogenetic theory and the underlying philosophies which are of importance to a diverse audience. Scientists, conservationists, and students of biology will find that this book provides a critical evaluation of the literature on this complex field. Southeastern Naturalist

• Preface, by Quentin D. Wheeler & Rudolf Meier 1: Introduction, by Joel Cracraft A. Position Papers (Point) 2: The Biological Species Concept, by Ernst Mayr 3: The Hennigian Species Concept, by Rudolf Meier and Rainer Willmann 4: Monophyly, Apomorphy, and Phylogenetic Species Concepts, by Brent D. Mishler and Edward Theriot 5: The Phylogenetic Species Concept, by Quentin D. Wheeler and Norman I. Platnick 6: The Evolutionary Species Concept, by Edward O. Wiley and Richard L. Mayden B. Critique Papers (Counter-Point) 7: What is a Species, and What is Not?: A Critique from the Biological Species Concept Perspective, by Ernst Mayr 8: A Critique from the Hennigian Species Concept Perspective, by Rainer Willmann and Rudolf Meier 9: Monophyly, Apomorphy, and Phylogenetic Species Concepts: A Critique from "the" Phylogenetic Species Concept Perspective, by Brent D. Mishler and Norman I. Platnick 10: Problems with Alternative Species Concepts: A Critique from "the" Phylogenetic Species Concept Perspective, by Quentin D. Wheeler and Norman I. Platnick 11: A Critique from the Evolutionary Species Concept Perspective, by Edward O. Wiley and Richard L. Mayden C. Reply Papers (Rebuttal) 12: A Defense of the Biological Species Concept, by Ernst Mayr 13: A Defense of the Hennigian Species Concept, by Rudolf Meier and Rainer Willmann 14: Monophyly, Apomorphy, and Phylogenetic Species Concepts: A Defense of "the" Phylogenetic Species Concept, by Brent D. Mishler and Edward Theriot 15: A Defense of "the" Phylogenetic Species Concept, by Norman I. Platnick and Quentin D. Wheeler 16: A Defense of the Evolutionary Spoecies Concept, by Edward O. Wiley and Richard L. Mayden

Quentin D. Wheeler is professor of systematics in the Department of Entomology and Liberty Hyde Bailey Hortorium at Cornell University and is a research associate in entomology at the American Museum of Natural History. Rudolf Meier is associate professor and curator in the Department of Entomology at the Zoological Museum, Copenhagen.

This is an important and valuable book, with the arguments coming straight from the horses' mouths. Even if readers do not change their minds, they will at least be better informed in their prejudices. Biologist This book focuses on the numerous controversies in phylogenetic theory and the underlying philosophies which are of importance to a diverse audience. Scientists, conservationists, and students of biology will find that this book provides a critical evaluation of the literature on this complex field. Southeastern Naturalist

• Preface, by Quentin D. Wheeler & Rudolf Meier 1: Introduction, by Joel Cracraft A. Position Papers (Point) 2: The Biological Species Concept, by Ernst Mayr 3: The Hennigian Species Concept, by Rudolf Meier and Rainer Willmann 4: Monophyly, Apomorphy, and Phylogenetic Species Concepts, by Brent D. Mishler and Edward Theriot 5: The Phylogenetic Species Concept, by Quentin D. Wheeler and Norman I. Platnick 6: The Evolutionary Species Concept, by Edward O. Wiley and Richard L. Mayden B. Critique Papers (Counter-Point) 7: What is a Species, and What is Not?: A Critique from the Biological Species Concept Perspective, by Ernst Mayr 8: A Critique from the Hennigian Species Concept Perspective, by Rainer Willmann and Rudolf Meier 9: Monophyly, Apomorphy, and Phylogenetic Species Concepts: A Critique from "the" Phylogenetic Species Concept Perspective, by Brent D. Mishler and Norman I. Platnick 10: Problems with Alternative Species Concepts: A Critique from "the" Phylogenetic Species Concept Perspective, by Quentin D. Wheeler and Norman I. Platnick 11: A Critique from the Evolutionary Species Concept Perspective, by Edward O. Wiley and Richard L. Mayden C. Reply Papers (Rebuttal) 12: A Defense of the Biological Species Concept, by Ernst Mayr 13: A Defense of the Hennigian Species Concept, by Rudolf Meier and Rainer Willmann 14: Monophyly, Apomorphy, and Phylogenetic Species Concepts: A Defense of "the" Phylogenetic Species Concept, by Brent D. Mishler and Edward Theriot 15: A Defense of "the" Phylogenetic Species Concept, by Norman I. Platnick and Quentin D. Wheeler 16: A Defense of the Evolutionary Spoecies Concept, by Edward O. Wiley and Richard L. Mayden

Quentin D. Wheeler is professor of systematics in the Department of Entomology and Liberty Hyde Bailey Hortorium at Cornell University and is a research associate in entomology at the American Museum of Natural History. Rudolf Meier is associate professor and curator in the Department of Entomology at the Zoological Museum, Copenhagen.

This is an important and valuable book, with the arguments coming straight from the horses' mouths. Even if readers do not change their minds, they will at least be better informed in their prejudices. Biologist This book focuses on the numerous controversies in phylogenetic theory and the underlying philosophies which are of importance to a diverse audience. Scientists, conservationists, and students of biology will find that this book provides a critical evaluation of the literature on this complex field. Southeastern Naturalist

• Preface, by Quentin D. Wheeler & Rudolf Meier 1: Introduction, by Joel Cracraft A. Position Papers (Point) 2: The Biological Species Concept, by Ernst Mayr 3: The Hennigian Species Concept, by Rudolf Meier and Rainer Willmann 4: Monophyly, Apomorphy, and Phylogenetic Species Concepts, by Brent D. Mishler and Edward Theriot 5: The Phylogenetic Species Concept, by Quentin D. Wheeler and Norman I. Platnick 6: The Evolutionary Species Concept, by Edward O. Wiley and Richard L. Mayden B. Critique Papers (Counter-Point) 7: What is a Species, and What is Not?: A Critique from the Biological Species Concept Perspective, by Ernst Mayr 8: A Critique from the Hennigian Species Concept Perspective, by Rainer Willmann and Rudolf Meier 9: Monophyly, Apomorphy, and Phylogenetic Species Concepts: A Critique from "the" Phylogenetic Species Concept Perspective, by Brent D. Mishler and Norman I. Platnick 10: Problems with Alternative Species Concepts: A Critique from "the" Phylogenetic Species Concept Perspective, by Quentin D. Wheeler and Norman I. Platnick 11: A Critique from the Evolutionary Species Concept Perspective, by Edward O. Wiley and Richard L. Mayden C. Reply Papers (Rebuttal) 12: A Defense of the Biological Species Concept, by Ernst Mayr 13: A Defense of the Hennigian Species Concept, by Rudolf Meier and Rainer Willmann 14: Monophyly, Apomorphy, and Phylogenetic Species Concepts: A Defense of "the" Phylogenetic Species Concept, by Brent D. Mishler and Edward Theriot 15: A Defense of "the" Phylogenetic Species Concept, by Norman I. Platnick and Quentin D. Wheeler 16: A Defense of the Evolutionary Spoecies Concept, by Edward O. Wiley and Richard L. Mayden