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Segmentation, metamerism and the Cambrian explosion

journal contribution
posted on 2023-06-08, 05:14 authored by Juan Pablo Couso
Data on the molecular and genetic basis of animal development, and on genome sequences, have been challenging our established assumptions about animal evolution for the last decade. Recent such data in animals of particular phylogenetic importance beg us to take another look at whether similarities in developmental and genetic mechanisms in current animals are the product of a common inheritance (homology) or convergent evolution (analogy). The evolution of segmentation, in particular whether segmentation and metameric bodies have arisen just once or several times in evolution, is a prime concern. Segmentation and metamerism are striking developmental and body organisations that exist, in varying degrees, in many complex animals, but the traditional view holds that this is the result of convergent evolution. Here, I review recent palenotological and developmental information and conclude that a metameric body plan is not only a likely ancestral character of bilaterian animals, but also a possible trigger for the Cambrian explosion in body morphology and complexity. This conclusion is supported by the phylogenetic distribution and prevalence of metameric phyla in the Cambrian, and the similarity of the genomes and segmentation mechanisms across current bilaterian phyla.

History

Publication status

  • Published

Journal

International Journal of Developmental Biology

ISSN

0214-6282

Publisher

University of the Basque Country Press

Volume

53

Page range

1305-1316

Pages

12.0

Department affiliated with

  • Biochemistry Publications

Notes

Issue 8-10

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-02-06

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