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Primitive fish could nod but not shake its head

Ancient fossils reveal surprises about early vertebrate necks, abdominal muscles

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2:20pm, June 13, 2013

Ancient fish fossils with preserved muscle tissue offer a glimpse at how necks evolved in early vertebrate animals. The fossils also offer a puzzle: The fish had specialized abdominal muscles found today in land animals, but not in fish, paleontologists report June 13 in Science.

The 380-million-year-old fossils come from Western Australia’s Gogo Formation and contain three-dimensional

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