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Nature 424, 885-886 (21 August 2003) | doi:10.1038/424885a
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Zoology: You aren't what you eat
Henry Gee1
Abstract
An obscure marine worm does not belong among the molluscs, as had been thought. Rather, it has a claim to being the most primitive extant member of the group of animals that includes vertebrates.
Only those fond of the less-frequented pages of zoology textbooks — the chapters that deal with organisms such as gastrotrichs and gnathostomulids — will have ever heard of a small marine worm called Xenoturbella bocki. First described in 1949, this creature has struggled to find a phylogenetic home, and has been loosely attached to many animal groups.
- Henry Gee is a senior editor at Nature.
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