FIGURE 10. 1–3 in Systematic revision of the trilobite genera Laudonia and Lochmanolenellus (Olenelloidea) from the lower Dyeran (Cambrian Series 2) of western Laurentia

FIGURE 10. 1–3, Cephala of Lochmanolenellus cf. primus 1 from upper portion of Puerto Blanco Formation at USNM locality 801c, Cerros de la Proveedora, Caborca area, Sonora, Mexico. 1, USNM 115684, x1.5. 2, USNM 115683, x1.5. 3, Enlargement of 2 showing traces of polygonal prosopon in anterior cephalic border furrow, x4. 4–7, Cephala of Lochmanolenellus cf. primus 2 from Unit 4 of Rosella Formation, Cassiar Mountains, northern British Columbia. 4, Cephalon in phase 3 of development; GSC 137488, from GSC locality 95190, x22. 5, Cephalon in early phase 5 of development; GSC 137489, from GSC locality 95190, x15. 6, Cephalon in phase 5 of development; GSC 137490, from GSC locality 95190, x7. 7, Cephalon in phase 5 of development; GSC 137491, from GSC locality 95189, x6. All specimens in dorsal view.