An article published in the journal “Nature” describes the discovery of fossils of a species of marine arthropods that lived a little more than 500 million years ago in the Permian period. Calling Tokummia Katalepsis, this species is one of the many discovered in Burgess Shale and is important because according to Cédric Ariz and Jean-Bernard Caron of the Royal Ontario Museum (ROM) it shows the origin of mandibulates (Mandibulata), a group of arthropods that includes millipedes, crustaceans and insects.