The Seat of Fish Diversification (IMAGE) University of Pennsylvania Caption Pituriaspis, a member of rare group of 410 million year old jawless fishes from Australia, meets a mate along the shoreline. Research by the University of Pennsylvania's Lauren Sallan and colleagues found that such groups diversified in shallow ocean waters before spreading out to other habitat types. Credit Nobumichi Tamura Usage Restrictions In context of reporting 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.