Iridescence in Squid (image) Marine Biological Laboratory Caption Neurally activated iridescence in squid iridophores. Doryteuthis pealeii have conspicuous pigmentary chromatophores and underlying structurally colored iridophores. Credit Wardill, Gonzalez-Bellido, Crook & Hanlon, Proceedings of the Royal Society B: Biological Sciences Usage Restrictions May be used with credit. 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.