PLATE 6. Tesselacauda depressa Ross, 1951, from Section MME 75.5 m in Revision of the Early Ordovician (late Tremadocian; Stairsian) cheirurid trilobite Tesselacauda Ross, with species from the Great Basin, western USA

PLATE 6. Tesselacauda depressa Ross, 1951, from Section MME 75.5 m, Fillmore Formation (upper Tremadocian; Stairsian; Bearriverops loganensis Zone), Middle Mountain, Ibex area, Millard County, western Utah, USA. 1, 3, 4. Pygidium, SUI 147546, dorsal, left lateral, and posterior views, x10. 2, 5, 6, 8, 12. Pygidium, SUI 134130, dorsal, left lateral, posterior, ventral, and anterior views, x10. 7, 9, 11, 15, 16. Pygidium, SUI 147547, dorsal, right lateral, posterior, ventral, and anterior views, x10. 10, 18, 20. Pygidium, SUI 147548, right lateral, dorsal, and posterior views, x10. 13, 19, 23. Pygidium, SUI 147549, left lateral, dorsal, and posterior views, x10. 14, 21, 22. Pygidium, SUI 147550, right lateral, posterior, and dorsal views, x12. 17, 24, 25. Pygidium, SUI 147551, left lateral, posterior, and dorsal views, x12.