Animal Evolution is a complete analysis of the evolutionary interrelationships and myriad diversity of the animal kingdom. Using modern phylogenetic reasoning based on characters from an extensive review of morphology including ultrastructure and embryology, each phylum is analysed to ascertain its monophyly, and hence its ancestral characters. These ancestral characters are then used to construct a complete phylogenetic tree of the extant animal phyla. This new edition brings the subject fully up to date, and includes new ideas and emphases as well as the most recent bibliographic data. There are new chapters on the use of computer programmes and molecular techniques to create phylogenies, tools which have attracted widespread use since the first edition was published.