Hallucigenia, a bizarre worm that lived around 500 million years ago, was one of the strangest creatures to ever live. These strange creatures lived during the Cambrian Period of geological, a time when multicellular lifeforms first came into existence. A vast increase in biodiversity at this time produced some bizarre creatures, but Hallucigenia was truly unique. The species did not seem to belong to any known family or tree of animals, leaving biologists without a way of easily classifying the creature.
Cambridge University researchers now believe they have discovered the only living descendant of the unusual creatures, a type of animal still alive on the Earth today.