Photo of Lampreys (IMAGE) University of Chicago Press Journals Caption The invasive massive-mouthed sea lamprey (Petromyzon marinus), at the far right, is pictured with the four native Great Lakes lamprey species. From right to left: American brook lamprey (Lethenteron appendix), chestnut lamprey (Ichthyomyzon castaneus), silver lamprey (Ichthyomyzon unicuspis), and northern brook lamprey (Ichthyomyzon fossor). By profiling pheromone-related bile acids from these and other lamprey species from around the world, Buchinger et al. offers rare evidence that sexual selection drives evolution of pheromone production. Credit This photograph was taken by Andrea Miehls and is provided courtesy of the Great Lakes Fishery Commission/USGS. Usage Restrictions Use with credit 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.