- xxxiii, 245 p. : ill. (some col.) ; 25 cm.
- Contents: Are species constructs of the human mind? -- Why is there a species problem? -- Is the biological species a class or is it an individual? -- What are traits in taxonomy? -- Diversity within the species : polymorphisms and polytypic species -- Biological species as gene-flow community -- The cohesion of organisms through genealogical lineage (cladistics) -- Outlook.Includes bibliographical references (p. 219-227) and index.