What, if anything, are species?
Author. Introduction. What Should the Species Level Represent within the Current Ranked Codes of Nomenclature? The Need for Pluralism Because of Different Biologies in Different Taxa. A Phylogenetic Species Concept. What Should Happen to Taxa at the Traditional Species Level under a Rankless Code of Nomenclature? General Principles of Rankless Classification Extended to the Species Rank. Discussion: What Would the World Be Like without the Species Rank?. Endnotes. Index .