PLATE 5. 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 5. 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, 5, 9, 13. Hypostome, SUI 147537, ventral, right lateral, posterior, and anterior views, x10. 2, 6, 10, 14. Hypostome, SUI 147538, ventral, right lateral, posterior, and anterior views, x10. 3, 7, 11, 15, 19. Hypostome, SUI 147539, ventral, left lateral, posterior, anterior, and dorsal views, x10. 4, 8, 12, 16, 20. Hypostome, SUI 147540, ventral, right lateral, posterior, anterior, and dorsal views, x12. 17, 21, 23, 25. Hypostome, SUI 147541, ventral, right lateral, posterior, and anterior views, x12. 18, 22, 24, 26. Hypostome, SUI 147542, ventral, left lateral, posterior, and anterior views, x12. 27, 30, 32, 35. Hypostome, SUI 147543, ventral, left lateral, posterior, and anterior views, x15. 28, 33, 34, 36. Hypostome, SUI 147544, ventral, left lateral, posterior, and anterior views, x15. 29, 31, 37–39. Pygidium, SUI 147545, dorsal, right lateral, posterior, ventral, and anterior views, x15.