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Proc Natl Acad Sci U S A. 2000 Apr 25;97(9):4434-7.

Evolution of the bilaterian body plan: what have we learned from annelids?

Author information

  • 1Section of Molecular Cell and Developmental Biology, and Institute of Cellular and Molecular Biology, University of Texas, Austin, TX 78712, USA. hastypig@mail.utexas.edu

Abstract

Annelids, unlike their vertebrate or fruit fly cousins, are a bilaterian taxon often overlooked when addressing the question of body plan evolution. However, recent data suggest that annelids offer unique insights on the early evolution of spiral cleavage, anteroposterior axis formation, body axis segmentation, and head versus trunk distinction.

PMID:
10781038
PMCID:
PMC34316
[PubMed - indexed for MEDLINE]
Free PMC Article
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