PLATE 2. Tesselacauda depressa Ross, 1951 in Revision of the Early Ordovician (late Tremadocian; Stairsian) cheirurid trilobite Tesselacauda Ross, with species from the Great Basin, western USA

PLATE 2. Tesselacauda depressa Ross, 1951, from Section HC5 106.7 m, east side of Hillyard Canyon, HC6 88.3 m, west side of Hillyard Canyon, and Section FB7 102.1 m, Franklin Basin, both Garden City Formation (upper Tremadocian; Stairsian; Bearriverops loganensis Zone), Bear River Range, Franklin County, southeastern Idaho, USA. 1, 2. Right librigena, SUI 147511, external and internal views, x10 (HC5 106.7 m). 3, 6, 9, 11. Hypostome, SUI 147512, ventral, right lateral, posterior, and anterior views, x8 (FB7 102.1 m). 4, 7, 10, 12. Hypostome, SUI 147513, ventral, left lateral, posterior, and anterior views, x10 (HC6 88.3 m). 5. Left librigena, SUI 147514, external view, x12 (HC5 106.7 m). 8. Right librigena, SUI 147515, external view, x15 (HC5 106.7 m). 13–16. Hypostome, SUI 147516, ventral, dorsal, right lateral, and posterior views, x8 (HC5 106.7 m). 17. Hypostome, SUI 147517, ventral view, x10 (HC5 106.7 m). 18, 21, 22, 24, 25. Pygidium, SUI 147518, dorsal, posterior, left lateral, ventral, and anterior views, x10 (HC5 106.7 m). 19, 20, 23, 27. Pygidium, SUI 147519, left lateral, dorsal, ventral, and posterior views, x10 (HC5 106.7 m). 26, 28, 29. Pygidium, SUI 147520, right lateral, posterior, and dorsal views, x14 (HC5 106.7 m).