PLATE 13. 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 13. Tesselacauda kriegerae n. sp., from Section G 26.6 m and Section C 111.6 m, both Fillmore Formation (upper Tremadocian; Stairsian; Bearriverops alsacharovi Zone), Ibex area, Millard County, western Utah, USA. 1–4. Cranidium, SUI 147595, dorsal, ventral, left lateral, and anterior views, x6 (G 26.6 m). 5, 6, 8. Cranidium, SUI 147596, dorsal, left lateral, and anterior views, x6 (G 26.6 m). 7, 9, 11, 14, 16. Cranidium, SUI 134173, dorsal, left lateral, ventral, anterior, and oblique views, x7.5 (G 26.6 m). 10, 12, 13, 18. Cranidium, holotype, SUI 147597, left lateral, ventral, dorsal, and anterior views, x6 (C 111.6 m). 15, 25, 26. Cranidium, SUI 147598, left lateral, anterior, and dorsal views, x6 (G 26.6 m). 17, 22, 23. Cranidium, SUI 147599, dorsal, anterior, and left lateral views, x8 (C 111.6 m). 19, 20, 24. Cranidium, SUI 147600, anterior, right lateral, and dorsal views, x6 (G 26.6 m). 21. Cranidium, SUI 147601, dorsal view, x6 (C 111.6 m).