Re: Common ancestor of protostomes and deuterostomes
- From: r norman <r_s_norman@xxxxxxxxxxxx>
- Date: Sat, 19 Apr 2008 16:56:07 -0700
On Sat, 19 Apr 2008 15:10:50 -0700 (PDT), Remus <roamulus@xxxxxx>
wrote:
I have been reviewing some of the processes of gastrulation and
embryogenesis recently and became interested in what is generally
considered to be the common ancestor of the protostomes and the
deuterostomes. I couldn't really find much on the subject. Is it
generally considered that both branched off from cnidarians
separately, or is there generally considered to be an ancestor of all
bilateria that then specialized to produce the protostomes and the
deuterostomes? Or are even the cnidarians a seperate branch, with the
bilaterians or even both the protostomes and the deuterostomes
branching off from something like the ctenophora?
There is generally considered to be an urbilaterian, a true bilateral
animal separate from the cnidarians. This used to be taken to be some
sort of acoelomate flatworm, but that is no longer considered true
with the advent of the lophotrochozoan - ecdysozoan split in the
former protostomes.
The best (and most recent) attempt to discuss this is
Evolving a Deuterostome
http://nimravid.wordpress.com/2008/03/05/protostome-deuterostome/
The best journal paper I could see on this is
The last common bilaterian ancestor
Douglas H. Erwin1 and Eric H. Davidson
Development 129, 3021-3032 (2002)
http://dev.biologists.org/cgi/content/full/129/13/3021?ijkey=727a87b2fa24d93d96d4a0c6f38086523ce052fd
.
- References:
- Common ancestor of protostomes and deuterostomes
- From: Remus
- Common ancestor of protostomes and deuterostomes
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