Bok
10-29-2012, 07:03 PM
A study on the development of priapulids or ‘penis’ worms throws doubt on a feature that has been thought for more than 100 years to define the largest branch of the animal tree of life. Members of this branch -- the protostomes -- have historically been defined by the order in which they develop a mouth and an anus as embryos. But gene-expression data suggest that this definition is incorrect, researchers report this week in Current Biology .
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[More] (http://www.scientificamerican.com/article.cfm?id=penis-worm-shakes-evolutionary-tree)
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