Figure 5From: Beyond memorization: an intermediate-level paleontology activity that integrates anatomy, ecology, and macroevolutionary theory using trilobites Phylogenetic relationships plotted against geologic time on the y-axis for A) the Xiphosurida (horseshoe crabs) modified after Anderson and Selden ([1997]), with permission from John Wiley and Sons, license 3326071282933; and B) the trilobite superfamily Olenelloidea from Lieberman ([1999]), copyright Yale University. Back to article page