Book excerpt: Generally, biologists and mathematicians who study the shape and form of organisms have largely been working in isolation from those who work on evolutionary relationships through the analysis of common characteristics. Increasingly however, dialogue between the two communities is beginning to develop - but other than a handful of journal papers, there has been no formal, published discussion on this subject. This timely book summarises the interdisciplinary work that has taken place and will stimulate additional research into these topics. Any scientist working on evolutionary relationships will find this volume invaluable.