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The Evolution of Organ Systems$
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Andreas Schmidt-Rhaesa

Print publication date: 2007

Print ISBN-13: 9780198566687

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780198566687.001.0001

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The phylogenetic frame

The phylogenetic frame

(p.3) CHAPTER 2 The phylogenetic frame
The Evolution of Organ Systems

A. Schmidt-Rhaesa

Oxford University Press

This chapter presents the available data for the reconstruction of a tree. It shows that there is a robust backbone, along with several areas of uncertainty. Such controversies are discussed which provide alternative interpretations of the evolution of organ systems. The chapter starts with some general remarks on the current problems of phylogeny reconstruction. The phylogenetic relationships of all major taxa are then discussed in detail. This gives a presentation of the tree that is used as a basis for the book. Not one particular tree is used, but several areas are considered, in particular the position of acoelomorphs, the Ecdysozoa/Articulata debate, and the position of tentaculate taxa are regarded as not fully settled and treated with care.

Keywords:   phylogeny, metazoa, problems of systematics, tree of life, animal evolution, acoelomorphs, Ecdysozoa/Articulata debate

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