Affiliation: | Committee on Evolutionary Biology, University of Chicago, 1025 E. 57th Street, Culver Hall 401, Chicago, IL 60637, USA; Department of Geology, The Field Museum of Natural History, 1400 S. Lake Shore Drive, Chicago, IL 60605, USA; Department of Geology, Augustana College, 639 38th Street, Rock Island, IL, USA; Department of Biological Sciences, University of Alberta, CW 405 Biological Sciences Centre, Edmonton, Alberta, Canada |