Re: Evolution of chordates
- From: r norman <NotMyRealEmail@xxxxxxxxxxxx>
- Date: Sun, 30 Apr 2006 12:13:45 -0400
On 30 Apr 2006 09:04:43 -0700, "Ron O" <rokimoto@xxxxxxx> wrote:
Arkalen wrote:
I read in an old book on biology that the ancestors of chordates might have
been sponges of some sort (their larvae actually).
How is this theory faring nowadays ? What is the most popular hypothesis for
the origins of chordates ?
Not sponges. You are probably thinking of sea squirts.
Molecular evidence confirms the evolutionary linkage.
Multicellular organisms from nematodes on up have been traced to a
specific lineage of sponges.
Technical quibble: not sea squirt but an ancestral chordate (that
probably would be called a sea squirt if we saw it today).
So if birds are dinosaurs and mammals are fish, then we are all
sponges!
.
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