Evolutionary Placement of Undinarchaeota (IMAGE) Royal Netherlands Institute for Sea Research Caption Depiction of the evolutionary placement of Undinarchaeota in an archaeal tree as a sister group of the symbiotic DPANN archaea (left). Illustration of cell of an Undinarchaeota representative, which might have pili (cell appendages) and may be able to take up DNA but is likely dependent on partner organisms for the acquisition of various metabolites (right). Credit Anja Spang Usage Restrictions None License Licensed content 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.