This sweeping discussion of the philosophy of evolutionary biology is based on the author's revolutionary idea that species are not kinds of organisms but wholes composed of organisms--individuals in the broadest ontological sense. Although the book's primary focus is on species and speciation, it deals with a wide variety of other fundamental units and basic processes and provides a reexamination of the role of classification in biology and other sciences.

In explaining his individuality thesis, Michael T. Ghiselin provides extended discussions of such philosophical topics as definition,...