Format

Send to

Choose Destination
Mol Phylogenet Evol. 2002 Sep;24(3):358-65.

The Radiata and the evolutionary origins of the bilaterian body plan.

Author information

1
Kewalo Marine Lab, University of Hawaii, 41 Ahui St., Honolulu, HI 96813, USA. mqmartin@hawaii.edu
2
U HI, Honolulu

Abstract

The apparent conservation of cellular and molecular developmental mechanisms observed in a handful of bilaterian metazoans has spawned a "race" to reconstruct the bilaterian ancestor. Knowledge of this ancestor would permit us to reconstruct the evolutionary changes that have occurred along specific bilaterian lineages. However, comparisons among extant bilaterians provide an unnecessarily limited view of the ancestral bilaterian. Since the original bilaterians are believed by many to be derived from a radially symmetrical ancestor, additional evidence might be obtained by examining present-day radially symmetrical animals. We briefly review pertinent features of the body plans of the extant radial eumetazoan phyla, the Cnidaria, and Ctenophora, in the context of revealing potential evolutionary links to the bilaterians.

PMID:
12220977
DOI:
10.1016/s1055-7903(02)00208-7
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center