A Genetic Record for the Silver Spinyfin (IMAGE) University of Basel Caption The silver spinyfin (Diretmus argenteus) is the vertebrate with the highest number of opsin genes. Credit Alexandra Viertler, University of Basel Usage Restrictions With current release only 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.