Are species constructs of the human mind?
Why is there a species problem?
What are traits in taxonomy?
Diversity within the species: polymorphisms and the polytypic species
Biological species as a gene-flow community
The cohesion of organisms through genealogical lineage (cladistics)
“The question whether species really exist and if so, what the nature of their existence is, remains a central problem in the philosophy of biology, even after many decades of thinking and debating. Kunz’s book clearly shows that the debate is far from over”. (Acta Biotheor, 1 June 2013)
“This year’s version is an interesting hybrid that lays out the various concepts, but deals with them with the practicing biologist in mind, not the philosopher. For that, I applaud it.” (Teaching Biology, 20 December 2012)
"Recommended for those with a technical or semi-technical interest in systematics." (Ian Paulsen, Birdbooker Report 244, Oct 2012)