Pleurobranchaea and Flabellina (image) University of Illinois at Urbana-Champaign Caption University of Illinois molecular and integrative physiology professor Rhanor Gillette and his team found that the predatory sea slug, Pleurobranchaea californica (left) shows avoidance behavior when confronted with Flabellina iodinea (right). This avoidance behavior is much more complex than what Pleurobranchaea, which has a simple nervous system, was thought to be capable of having. Credit Rhanor Gillette Usage Restrictions This photo may only be used in conjunction with information about this research. 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.