Lamprey Life Cycle (IMAGE) University of Kansas Caption Here are specimens and restorations of larva, early transformer, and adult of M. mengae, showing its three-phased life cycle. (A) Larva of M. mengae. a1, restoration of larval M. mengae; a2, restoration of burrowing larvae of M. mengae; a3, photograph of right view. (B) Early transformer of M. mengae. b1, restoration; b2, photograph of right view. (C) Adult or late transformer of M. mengae. c1, photograph of holotype of M. mengae in right view; and c2, its restoration. Credit Courtesy <i>Proceedings of the National Academy of Sciences</i>. Usage Restrictions None 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.