Figures 107–110 in Trypanothacus gen. n., a new genus of burrowing scorpion from the Arabian Peninsula (Scorpiones: Buthidae)

Figures 107–110: Morphometric scaling relations of the telson of fossorial 'Buthus group' scorpions. Figure 107. Double logarithmic scatterplot of telson vesicle length/ depth (L/ D) ratio vs. aculeus length normalized to vesicle length (aculeus L/ vesicle L), for large pelophiles/ semipsammophiles (4 genera, 53 species) (Buthus, Odontobuthus, Pantobuthus: orange circles; Trypanothacus gen. n.: blue circles) and large psammophiles/ ultrapsammophiles (6 genera, 29 species) (Buthacus: cyan circles; Vachoniolus: dark green circles; Apistobuthus, Buthiscus, Liobuthus, and Plesiobuthus: yellow circles). Dark line: linear least squares regression fit to all data shown (Pearson correlation coefficient, R = 0.57). Upper right inset: diagram of measurements estimated from inverted telson lateral profiles, with dorsal surface of vesicle approximately leveled; SA = ventral profile length of aculeus from base point to tip, LV = length of vesicle from anterior limit or inflection point to aculeus base point; HV = vesicle depth or height (distance between dorsal and ventral tangent planes). Base point was placed at local minimum of inverted ventral profile curve. SA was calculated by cubic spline fit (>10 anchor points). For a minority of broken tips, SA was estimated by intersecting extrapolated dorsal and ventral profile curves (<5%). Figure 108. Scatterplot of fossorial buthids in Figure 107, superposed upon larger scale plot of Order Scorpiones (gray circles). Gray line: linear least squares regression fit to Order Scorpiones data (including data in Figure 107) (Pearson correlation coefficient, R = –0.62). Also plotted are data from small 'Buthus group' psammophiles/ ultrapsammophiles (5 genera, 10 species: Compsobuthus arabicus, Lanzatus somalilandus, Neobuthus kutcheri, Picobuthus dundoni, P. wahibaensis, Anomalobuthus krivochatskyi, A. pavlovskyi, A. rickmersi, A. lowei, A. talebii) (dark yellow circles). Figure 109. Double logarithmic scatterplot of carapace length (L) vs. aculeus length normalized to vesicle length (i.e., aculeus L/ vesicle L) for psammophile/ ultrapsammophile members of the 'Buthus group', including large species in Figure 107, and small species in Figure 108 (dark yellow circles). Blue line: linear least squares regression fit to all data shown (Pearson correlation coefficient, R = 0.74). Figure 110. Scatterplot of psammophile buthid data in Figure 109 (all in one color, blue circles) superposed upon larger scale plot of Order Scorpiones (gray circles). Gray line: linear least squares regression to Order Scorpiones data (including data in Figure 109) (Pearson correlation coefficient, R = –0.01). Also plotted are data from bothriurid genus Brachistosternus (43 species) (magenta triangles), and corresponding linear least squares regression fit (R = 0.39). All plots in Figures 107-110 include data from both males and females. Data were assembled by mining taxonomic literature or directly measuring specimens. Included are 1854 species or subspecies (1331 ♂, 1201 ♀) representing all known extant genera (1841 species or subspecies) plus 7 fossil genera (13 species).