Shankland and Seaver PNAS bilaterian plan article online, etc

[Geoff Read]

Cleavage, Hox genes & segmentation, etc. I'm not sure if everyone has 
free access to PNAS online, but give it a go. Amongst a series of 
interesting-looking state-of-the-play perspectives. There's also a Conway 
Morris item on the Cambrian, an arthropod phylogeny & genes piece, and 
a DNA animal phylogeny piece by Adoutte et al ("The demise of Articules 
and the birth of Lophotrochozoa," etc).       

http://www.pnas.org/content/vol97/issue9/index.shtml
http://www.pnas.org/cgi/content/full/97/9/4434

Proc. Natl. Acad. Sci. USA, Vol. 97, Issue 9, 4434-4437, April 25, 2000

Special Feature: Perspective Evolution of the bilaterian body plan: What 
have we learned from annelids?  

Marty Shankland and Elaine C. Seaver 

Section of Molecular Cell and Developmental Biology, and Institute of 
Cellular and Molecular Biology, University of Texas,
Austin, TX 78712 

"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. "  

--
  Geoff Read <g.read at niwa.cri.nz>


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