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Two alternative topologies for chelicerates, one with Xiphosura nested within arachnid species (A) extracted from Figure 5, and the other with Xiphosura as a sister taxon to arachnid species (B) extracted from Figure 1 in Regier et al.19 The two are identical except for the position of Xiphosura. The topology in (B) is strongly rejected by sequence data (P < .0001).
