FIGURE 3 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada

FIGURE 3. Sclerites of species here assigned to Acanthoparyphinae, showing unique perforate tubercle sculpture found in multiple taxa and the occasional presence of transverse pit rows in place of pleural furrows. 1, 3. Forteyops sexapugius (Ross, 1951). 1. Pygidium, SUI 148403, dorsal view, x10, Garden City Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Round Hill, near Mantua, Box Elder County, Utah, USA. 3. Left librigena, SUI 148404, external view, x20, Fillmore Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Section H, 290.4 m, southern Confusion Range, Millard County, Utah, USA.. 2. Forteyops n. sp., pygidium, SUI 148405, dorsal view, x12, Wah Wah Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Section J 46.8 m, southern Confusion Range, Millard County, Utah, USA. 4. Kawina? webbi Hintze, 1953, left librigena, SUI 148406 external view, x20, Wah Wah Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Section J