Two of the Fossils Sampled for the Study (IMAGE) University of Bristol Caption Two of the fossils sampled for the study with the fossil melanosomes found in each fossil (scanning electron microscope images). Scaniacypselus to the left and Primotrogon to the right. Melanosome shape varies in the different samples, and is indicative of color. The sample furthest to the left was predicted as iridescent Credit Photographs of Scaniacypselus and Primotrogon by Jakob Vinther and Fiann Smithwick. Usage Restrictions Single use 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.