Photos: Primordial Sea Scorpion Was a Top Predator

Laura Geggel

During the Ordovician period, these creatures likely scuttled along the seafloor as juveniles, but grew up to be top predators swimming around the ocean. (Image credit: Patrick Lynch Yale University) Excavation site The Iowa Geological Survey discovered the fossils during a mapping project of the Upper Iowa River. Amazing appendages The appendages of a juvenile P. decorahensis. Appendage spines The researchers found remains of both juvenile and adult specimens. As they age, the spines get really long, said study lead researcher James Lamsdell, a postdoctoral associate of paleontology at Yale University.

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