The book "Morphology, Molecules, Evolution and Phylogeny in Polychaeta and Related Taxa" provides a comprehensive summary of current knowledge about polychaetes and related groups. It highlights the morphological diversity and evolutionary changes within the annelids, particularly the Polychaeta, and discusses the significance of these organisms for understanding morphological and adaptive diversity. The authors integrate both traditional and modern research methods, including molecular markers and computer-assisted phylogenetic analysis, to present new insights and controversies in polychaete research. This work is a significant contribution to the science of polychaetes and will greatly influence future research in this field.