The modern horseshoe crab specimen shown in Figure 2e of this article and referenced in the text was mistakenly identified as Carcinoscorpius. The correct identification and specimen number are Tachypleus, Yale University YPM IZ 055578. The authors apologize for the error.
Author Biographical
Scott Lidgard (slidgard@fieldmuseum.org) is affiliated with the Integrative Research Center at the Field Museum, in Chicago, Illinois. Alan C. Love (aclove@umn.edu) is affiliated with the Department of Philosophy and the Minnesota Center for Philosophy of Science at the University of Minnesota, in Minneapolis.