An article published in the journal “Paleontology” describes a comparative study of various organisms of the so-called Ediacara fauna with the one called Stromatoveris psygmoglena. Jennifer F. Hoyal Cuthill of the Tokyo Institute of Technology and the British University of Cambridge and Jian Han of the Northwest University in Xi’an, China, analyzed more than 200 fossils of specimens of this organism that lived about 518 million years ago. A comparison with other organisms that lived later suggests that they were all animals that formed their own group, which was called Petalonamae.