FIGURE 20. 1–9 in Systematic revision of the trilobite genera Laudonia and Lochmanolenellus (Olenelloidea) from the lower Dyeran (Cambrian Series 2) of western Laurentia

FIGURE 20. 1–9, Morphologically mature cephala of Lochmanolenellus trapezoidalis n. sp. 1–4, Holotype cephalon in dorsal, anterior, right lateral, and oblique anterolateral views; GSC 137502, x3. 5, Details of prosopon on holotype cephalon; GSC 137502, x6. 6, GSC 137503, x3. 7, GSC 137504, x5. 8, 9, Fragmentary cephalon representing largest known specimen, and details of prosopon; GSC 137505, x1.5 and x3, respectively. 10–13, Hypostomes of Lochmanolenellus trapezoidalis n. sp. 10, 11, Ventral and lateral views of GSC 137506, x2. 12, GSC 137507, ventral view, x2. 13, GSC 137508, ventral view, x3. All from Unit 4 of the Rosella Formation, GSC locality 95191, Cassiar Mountains, northern British Columbia.