Re: Common ancestor of protostomes and deuterostomes
- From: Craig T <craig.tevis@xxxxxxxxxxxxxxxxxx>
- Date: Sat, 19 Apr 2008 17:10:25 -0700 (PDT)
On Apr 19, 5:10 pm, Remus <roamu...@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's a phylogenic tree at
http://whozoo.org/inverts/animalphylo.htm
It uses findings from Casey Dunn that show ctenophores branching off
before other animal groups. It shows protostomes as a sister group to
deuterostomes. Their common ancestor branched off from the common
ancestor of porifera and cnidarians. I know that the idea of comb
jellies branching off first was a radical split from earlier views,
but I don't know if anything else in this tree is controversial.
.
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