The book includes collection of theoretical papers dealing with the species problem, which is among most fundamental issues in biology. The principal topics are: consideration of the species problem from the standpoint of modern non-classical science paradigm, with emphasis on its conceptual status presuming its analysis within certain conceptual framework
evolutionary emergence of the species as discrete unit of certain level of generality
epistemological consideration of the species as a particular explanatory hypotheses, with respective revised concepts of biodiversity and conservation
considerations of evolutionary and phylogenomic species concepts as candidates for the universal one
re-appraisal of the biological species concept based on the "friend-foe" recognition system
species delimitation approach using multi-locus coalescent-based method
a re-consideration of the Darwin's species concept.