FIGURE 6 in The Lower Ordovician (upper Floian) bathyurid trilobite Aponileus Hu, with species from Utah, Texas, and Greenland 3293

FIGURE 6. "Acidiphorus" n. sp., from Section J 40.0 m, Wah Wah Formation (upper Floian; Blackhillsian; "Pseudocybele nasuta Zone"), southern Confusion Range, Ibex area, Millard County, western Utah, USA. This species and other undescribed species from the "Pseudocybele nasuta Zone" are closely related to the younger Psephosthenaspis Whittington, 1953. It is illustrated to facilitate comparison and will be described in detail in a forthcoming work. See text for discussion. 1, 4. Cranidium, SUI 131853, dorsal and anterior views, x7.5. 2, 3, 6. Pygidium, SUI 131854, posterior, dorsal, and right lateral views, x6. 5. Right librigena, SUI 131855, external view, x5.