PLATE 16. Tesselacauda kriegerae n in Revision of the Early Ordovician (late Tremadocian; Stairsian) cheirurid trilobite Tesselacauda Ross, with species from the Great Basin, western USA

PLATE 16. Tesselacauda kriegerae n. sp., from Section G 26.6–27.0 m, Fillmore Formation (upper Tremadocian; Stairsian; Bearriverops alsacharovi Zone), Ibex area, Millard County, western Utah, USA. 1, 2, 4. Pygidium, SUI 147623, dorsal, right lateral, and posterior views, x15 (G 26.6 m). 3, 5, 6. Pygidium, SUI 134174, dorsal, left lateral, and posterior views, x14 (G 26.6 m). 7, 10, 13, 14, 19. Pygidium, SUI 147624, dorsal, posterior, right lateral, ventral, and anterior views, x14 (G 26.6 m). 8, 9, 12, 15. Pygidium, SUI 147625, left lateral, dorsal, posterior, and ventral views, x12 (G 26.6 m). 11, 16, 17. Pygidium, SUI 147626, dorsal, posterior, and right lateral views, x15 (G 27.0 m). 18, 20, 21. Pygidium, SUI 147627, right lateral dorsal, and posterior views, x15 (G 26.6 m).