Polymorphism in the aggressive mimicry lure of the parasitic freshwater mussel Lampsilis fasciola 1Ecology and Evolutionary Biology, University of Michigan—Ann Arbor, Ann Arbor, Michigan, United States 2Alabama Aquatic Biodiversity Center, Marion, Alabama, United States of America 3Robotics Department & Mechanical Engineering Department, University of Michigan—Ann Arbor, Ann Arbor, Michigan, United States DOI 10.7717/peerj.17359 Academic Editor Donald Kramer Subject Areas Animal Behavior,...