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How new data can substantially alter interpretations -- placoderm evolution Answered

An article in Nature (PDF below) reports on the discovery of internal embryos in placoderm (armored fish) fossils. Besides being interesting, these otherwise mundane discoveries have the possibility to radically alter our interpretation of the origin and relationships of early vertebrates. Here's the "News and Views" editorial on the research article, which is more accessible to non-specialists than the original paper.