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Perspectives in Animal Phylogeny and Evolution$
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Alessandro Minelli

Print publication date: 2008

Print ISBN-13: 9780198566205

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780198566205.001.0001

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The evolution of animal body architecture

The evolution of animal body architecture

Chapter:
(p.184) CHAPTER 8 The evolution of animal body architecture
Source:
Perspectives in Animal Phylogeny and Evolution
Author(s):

Alessandro Minelli

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198566205.003.0008

This chapter discusses the evolution of the anteroposterior and dorsoventral patterning of the main body axis and its symmetry properties, then compares it to the ‘internal’ axis represented by the gut, thus describing metazoans as ‘double animals’ with two components, external and internal, largely independent in their morphogenesis and patterning, and to the secondary axes represented by the appendages. The origin of the latter is presented in light of the notion of paramorphism, according to which the appendages, rather than originating de novo, would derive from a redeployment of the same basic growth and patterning systems already involved in producing the main body axis. Nature and origin of the segmental organization present in several animal groups are discussed. The second half of the chapter surveys the evolution of the main organ systems, following a criticism of the current concept of organogenesis.

Keywords:   body axis, double animal, organogenesis, organs, paramorphism, segments, symmetry

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