PLATE 11. 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 11. 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, 3, 4, 7, 10. Pygidium, SUI 147579, dorsal, right lateral, posterior, ventral, and anterior views, x12. 2, 5, 6, 8, 11. Pygidium, SUI 147580, dorsal, posterior, right lateral, ventral, and anterior views, x15. 9, 15, 18. Pygidium, SUI 147581, right lateral, dorsal, and posterior views, x12. 12, 13, 16. Pygidium, SUI 134076, left lateral, dorsal, and posterior views, x15. 14, 17, 21. Pygidium, SUI 147582 dorsal, posterior, and left lateral views, x12. 19, 20, 22. Pygidium, SUI 147583, posterior, dorsal, and left lateral views, x12.