Before There Were Birds or Bees, This Is How Trilobites Made Babies

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The fragmented nature of the specimen was a lucky break because it revealed the anatomy often hidden under a trilobite’s shell. Importantly, nine of the arthropod’s rarely fossilized appendages were preserved in detail. “There are millions of broken trilobites and you don’t see limbs in many of them,” said Javier Ortega-Hernández, a co-author on the new study and Ms. Losso’s Ph.D. adv...

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