FIGURE 21 in Systematic revision of the trilobite genera Laudonia and Lochmanolenellus (Olenelloidea) from the lower Dyeran (Cambrian Series 2) of western Laurentia

FIGURE 21. Morphologically mature cephala of Lochmanolenellus trapezoidalis n. sp. 1, 2, GSC 137509, dorsal and oblique anterolateral view, x6. 3, GSC 137510, x6. 4, Cephalon showing short tropidium-like ridge in cephalic border furrow near genal spine bases, GSC 137511, x6. 5, LACMIP 12545, from LACMIP locality 17041, x4. 6, LACMIP 12546, from LACMIP locality 17041, x1.5. 7, Imprint of fragmentary cephalon; FMNH PE58490, from ICS-1336, x1. All in dorsal view unless specified. 1–4 from Unit 4 of Rosella Formation, GSC locality 95191, Cassiar Mountains, northern British Columbia. 5–7 from middle member of Poleta Formation, IS-4 section, Montezuma Range, Esmeralda County, Nevada.