A multinational team of paleontologists headed by Dr Thomas Harvey from the University of Leicester, UK, has described a strange balloon-shaped animal that swam in the Cambrian seas about 520 million years ago. Nidelric pugio. Image credit: Derek Siveter, Oxford University. The new fossil belongs to a now-extinct family of bizarre, balloon-shaped animals known as Chancelloriidae. It was uncovered from the Cambrian Series 2 Heilinpu Formation near...