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FIGURE 7. Diacanthaspis (s.l.) maquoketensis (Walter, 1924), from the Maquoketa Formation (lower Katian), Florenceville, Howard County, Iowa, USA. 1–4. Dorsal exoskeleton lacking pygidium, holotype, latex cast from external mold, SUI 9233, dorsal, oblique, anterior, and left lateral views, x7.5.