The content you've requested is available without charge only to active Sigma Xi members and affiliates.
If you are an active member, affiliate or individual subscriber, please log in now in order to access this article. Be sure you've entered your member or subscriber number on your profile page.
If you are not a member, affiliate or individual subscriber, you can:
Generations of zoology students have studied the lancelet—also known as amphioxus—because of the clues it may hold about the evolutionary history of the vertebrates. Resembling a little, colorless anchovy fillet, the lancelet is believed to bear an uncanny likeness to the invertebrate ancestor of the vertebrates. As unflattering as this may sound to a vertebrate wearing an Armani jacket, our authors provide further support for this theory on the basis of recent studies on the lancelet's molecular biology and embryonic development.