Defining species: a sourcebook from antiquity to today

Introduction

Section 1. The pre-modern definitions

Section 2. The early modern period

Section 3. Modern conceptions

Section 4. Reproductive isolation conceptions

Section 5. Evolutionary conceptions

Section 6. Phylogenetic conceptions

Section 7. Ecological conceptions

Section 8. Asexual conceptions

Section 9. Other conceptions

Section 10. Commentary and philosophy

Section 11. A list of 26 species definitions in the modern literature.