PLATE 9. Tesselacauda morrisoni n in Revision of the Early Ordovician (late Tremadocian; Stairsian) cheirurid trilobite Tesselacauda Ross, with species from the Great Basin, western USA

PLATE 9. Tesselacauda morrisoni n. sp., from Section MME 49.8 m, Fillmore Formation (upper Tremadocian; Stairsian; Rossaspis leboni Zone), Middle Mountain, Ibex area, Millard County, western Utah, USA. 1, 2, 4, 7, 10. Cranidium, SUI 147564, dorsal, right lateral, ventral, anterior, and oblique views, x7.5. 3, 5, 6, 9, 12. Cranidium, holotype, SUI 134075, dorsal, left lateral, ventral, anterior, and oblique views, x10. 8, 11, 14. Cranidium, SUI 147565, left lateral, dorsal, and anterior views, x7.5. 13, 16, 18. Cranidium, SUI 147566, dorsal, anterior, and left lateral views, x6. 15, 19, 22. Cranidium, SUI 147567, dorsal, anterior, and left lateral views, x7.5. 17, 20, 21. Cranidium, SUI 147568, left lateral, anterior, and dorsal views, x7.5.