Hallucigenia: an Animal so Strange that We Had No Idea Where He Had His Head for 40 Years

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For decades, paleontologists interpreted backwards a creature of the Cambrian found in Burgess Shale until new techniques helped place his head and his evolutionary kinship With just a few centimeters in length and a body armed with thorns, Hallucigenia sparsa became one of those fossils capable of uncomfortable science, not by what it reveals, but by what it resists to fit in. The animal, preserved in the sediments of Burgess Shale, forced for …