520-million-year-old worm fossil solves mystery of how modern insects, spiders and crabs evolved Phys.orgOrgan systems of a Cambrian euarthropod larva Nature.com‘My jaw just dropped’: 500 million-year-old larva fossil found with brain preserved Livescience.comA 520 million-year-old perfectly preserved creature is set to reveal secrets of evolution The Independent520-million-year-old fossil reveals how insects and spiders evolved The Elkhart Truth