We thank the editors G. Dyke and G. Kaiser for inviting this chapter and for their patience in receiving it. Colleagues across the globe, including Mark Norell, Carl Mehling, Xu Xing, Ricardo Martinez, Oscar Alcober, Angela Milner, Alejandro Kramarz, Oliver Rauhut, Fernando Novas, Rodolfo Coria, Diego Pol, and Oliver Hampe provided access to specimens and insights that helped shape this manuscript. M. Donnelly executed the reconstruction in Figure 1.1. Research that contributed to this chapter was supported by the U.S. National Science Foundation grant EAR 0228607.

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