Fossil of the Extinct Organism Tribrachidium (image) University of Bristol Share Print E-Mail Caption Computer simulations have allowed scientists, led by Dr Imran Rahman of the University of Bristol, UK to work out how this 555-million-year-old organism with no known modern relatives fed. Their research reveals that some of the first large, complex organisms on Earth formed ecosystems that were much more complex than previously thought. Credit M. Laflamme Usage Restrictions Image is for single use only to illustrate articles on the Science Advances paper 'Suspension feeding in the enigmatic Ediacaran organism Tribrachidium demonstrates complexity of Neoproterozoic ecosystems' by Rahman et al ,and is not to be archived. Please credit the copyright holder M. Laflamme Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.