Brainless mud worm update

Back in August, I reported here that scientists had “discovered a brainless mud worm with DNA remarkably similar to that of humans, indicating we share a common ancestor.”

I have just received a belated but welcome clarification in the comments box from Gareth Rees:

You imply that the discovery of Xenoturbella is recent. But it’s not — the genus was described in 1949. The recent discovery is the relationship of the Xenoturbellida to other phyla — originally placed in the Protostomia based on its anatomy and mode of life, it now appears to be in the Deuterostomia (based on its genetic sequence).