Figure 33 in Etudes on iurids, II. Revision of genus Calchas Birula, 1899, with the description of two new species (Scorpiones: Iuridae)

Figure 33: Relative position of chelal trichobothrium it in Calchas based on its location with respect to the fixed finger length. Trichobothrium it mean position indicated by open circle based on 30 samples. Method of measurement: ff_LENG = fixed finger length, it_POS = it position. Histogram of morphometric ratio shows mean (vertical bar), minimum, maximum, and standard error (black rectangle) ranges. We see two significant it positional differences in these species: In C. birulai and C. nordmanni, trichobothrium it is approximately at finger midpoint or proximal, most exaggerated in C. birulai, whereas in C. gruberi trichobothrium it is considerably distal of finger midpoint.