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

FIGURE 9. Bivariate scatterplots depicting intraspecific variation and interspecific disparity in various aspects of cephalic morphology among morphologically mature Lochmanolenellus species. 1, Orientation of the distal portion of the posterior cephalic margin (distal PCM). 2, Proportional cephalic width, measured as the ratio of the transverse distance between the genal spine bases to glabella length. 3, Proportional anterior advancement of the genal spine bases. 4, Relative location of the adgenal angle along the posterior cephalic margin (PCM), quantified as the ratio of the [linear distance from the innermost tip of the PCM to the adgenal angle] to the [linear distance from the innermost tip of the PCM to the adgenal angle + linear distance from the adgenal angle to the base of the genal spine where it contacts the distal PCM]. 5, Degree of lateral flaring of the intergenal spine, quantified as the angle between the outer margin of the proximal portion of the intergenal spine and the distal portion of the posterior cephalic margin (distal PCM). 6, Proportional width of LA. 7, Proportional length of LA. 8, Proportional length of L2.