X-rays reveal half-billion-year-old insect ancestor BBC.com‘My jaw just dropped’: 500 million-year-old larva fossil found with brain preserved Livescience.com520-million-year-old worm fossil solves mystery of how modern insects, spiders and crabs evolved Phys.orgA 520 million-year-old perfectly preserved creature is set to reveal secrets of evolution The IndependentX-rays reveal tiny half-billion-year-old creature AOL