Jump to ContentJump to Main Navigation
Perspectives in Animal Phylogeny and Evolution$
Users without a subscription are not able to see the full content.

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

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2019. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a monograph in OSO for personal use (for details see www.oxfordscholarship.com/page/privacy-policy).date: 23 July 2019

The evolution of animal body architecture

The evolution of animal body architecture

(p.184) CHAPTER 8 The evolution of animal body architecture
Perspectives in Animal Phylogeny and Evolution

Alessandro Minelli

Oxford University Press

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

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .