Evolution of chordates

From: "Arkalen" <skizzir@xxxxxxxxx>
Date: Sun, 30 Apr 2006 17:47:14 +0200

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 ?

.

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