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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.

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