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Slide #1. Systematics and Species Concepts Slide #2. Hierarchy of Taxonomic Categories Slide #3. Slide 3 Slide #4. Slide 4 Slide #5. Slide 5 Slide #6. Slide 6 Slide #7. Alternative Species Concepts Slide #8. Alternative Species Concepts Slide #9. The Reason for the Species Problem Slide #10. The Solution to the Species Problem Slide #11. Species Definitions from the Modern Synthesis Period Slide #12. Populations as Lineages Slide #13. Species Defined as Lineages Slide #14. A Consequence of the Metapopulation Lineage Concept Slide #15. Darwin (1859) on Species Slide #16. Species and the Evolutionary Synthesis Slide #17. The Species as a Fundamental Category of Organization Slide #18. Another Problem Slide #19. The Cell and the Organism Slide #20. The Species Category Slide #21. Alternative Defining Properties Slide #22. Current Definitions of the Species Category Slide #23. Origins of Current Practices Slide #24. Cause of the Species Problem Slide #25. Contingent Properties, Lineage Divergence, and Species Definitions Slide #26. Slide 26 Slide #27. A Solution to the Species Problem Slide #28. Roles of the Contingent Properties Slide #29. Another Advantage of the Proposed Solution Slide #30. Ernst Mayr and the New View of Species Slide #31. Why “Biological”? Slide #32. Important Properties of Biological Species Slide #33. Species Concepts versus Species Definitions Slide #34. Conclusions