Ctenophore (IMAGE) University of Bristol Caption This research challenges earlier evidence that Ctenophore is the earliest branching animal lineage first and puts sponges in that position. Credit Monterrey Bay Aquarium 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.