Part III - Phylogeny of major groups
Published online by Cambridge University Press: 08 January 2010
Summary
Based on the evidence and characters discussed in Parts 1 and 2 of this book, the chapters in Part 3 look at each of the traditional sections of the animal kingdom in turn. The sequence followed is a fairly classical one, so that particular groups can be found in the ‘expected’ places. The origins of the Metazoa, and relationships between the lower groups, are dealt with first (chapter 7); succeeding chapters are then devoted to the acoelomate and spiralian coelomate worms, and to the pseudocoelomates (chapters 8 and 9). The molluscs merit a chapter on their own (10); and then the arthropods are dealt with together (11), though they may not in fact be closely related to each other. Deuterostomes are dealt with collectively, with chordates included briefly (chapter 12). Finally the lophophorates are used in chapter 13 to highlight some problems with the underlying assumptions on which such a sequence of chapters is based.
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- Invertebrate RelationshipsPatterns in Animal Evolution, pp. 161 - 162Publisher: Cambridge University PressPrint publication year: 1990