The concept of species has played a central role in both evolutionarybiology and the philosophy of biology, and has been the focus of a number of booksin recent years. This book differs from other recent collections in two ways. It ismore explicitly integrative and analytical, centering on issues of generalsignificance such as pluralism and realism about species. It also draws on a broaderrange of disciplines and brings neglected cognitive, anthropological, and historicaldimensions to philosophical debates over species.The chapters are organized aroundfive themes: unity, integration, and pluralism; species realism; historicaldimensions; cognitive underpinnings; and practical import. The contributors includeprominent researchers from anthropology, botany, developmental psychology, thephilosophy of biology and science, protozoology, and zoology. Contributors: ScottAtran, Richard Boyd, Kevin de Queiroz, John Dupr?, Marc Ereshefsky, Paul E.Griffiths, David L. Hull, Frank C. Keil, Brent D. Mishler, David L. Nanney, DanielC. Richardson, Kim Sterelny, Robert A. Wilson