alt="placoderm maxilla" class="caption" src="/sites/default/files/2016/10/main/articles/101916_MR_placoderm_inline_rev.jpg" style="width: 400px; height: 327px; float: right;" title="<b>FOSSIL FISH</b> A new 3-D placoderm specimen carried skull and trunk armor, and had three jaw bones similar to those found in humans (maxilla shown). ~~ Min Zhu <em>et al</em>" />The blades,
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, called gnathal plates,
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, looked so peculiar that most scientists thought that the three-part jaw of humans originated in an early bony fish and that placoderms were just a funny little side branch in the vertebrate family tree. “The established view is that placoderms had evolved independently and that our jaw bones must have a separate origin,” Ahlberg says.
Placoderms are a highly debated group of animals,
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, says paleontologist Martin Brazeau of Imperial College London. No one quite knew where to place them.
In 2013, Ahlberg and colleagues found a new clue in a 419-million-year old fossil that had the body of a placoderm, but the three-part jaw of a bony fish. Such an animal,
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, called Entelognathus primordialis, “could never have been predicted from the fossil record,
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,” says paleontologist Gavin Young of Australian National University in Canberra.
That work bolstered the idea that placoderms weren’t,
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, in fact,
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, their own odd group that dead-ended hundreds of millions of years ago — some were actually the ancestors of bony fish (and thus humans). But it was just one fossil,
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, Ahlberg notes. “You don’t want to draw too big of conclusions from one

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