Stamos tackles the problem of determining exactly what a biological species is: in short, whether species are real and the nature of their reality. He critically considers the evolution of the three major contemporary views of species: species nominalism, species as classes, and species as individuals. Finally, he develops his own solution to the species problem, a solution aimed at providing a universal species concept worthy of the Modern Synthesis.
Stamos provides a thorough introduction to the debate over the ontological status of species..... Stamos's approach is a fresh alternative to the standard, well-worn positions. - Marc Ereshefsky, University of Calgary"