File:Aptostichus anatomy.png

English: Diagrammatic representation of quantitative measurements of morphological features and leg articles in Aptostichus. 11, 12: carapace, labium, sternum length and width. 13: lengths of leg I femur, tibia, metatarsus, tarsus, metatarsal proximal/ventral excavated region, number of tibia distal retrolateral spines. 14: lengths of leg IV femur and tarsus. 15: male palpal tibia length and width. 16: male copulatory bulb length.

Cl, Cw: carapace length and width (Fig. 11). Carapace length taken along the midline dorsal most posterior position to the anterior front edge of the carapace (chelicerae are not included in length). Carapace width taken at the widest point.

LBl, LBw: labium length and width taken from the longest and widest points, respectively (Fig. 12).

MF1, MT1, MM1, MA1: lengths of male leg I femur, tibia, metatarsus, and tarsus (Fig. 13).

MF4, MT4: length of male leg IV femur and tarsus (Fig. 14) taken from the prolateral aspect.

PTl, PTw: male palpal tibia length and width (Fig. 15).

Bl: palpal bulb length from embolus tip to the bulb base, taken in the ventral plane at its longest point (Fig. 16).

STRl, STRw: sternum length and width. Sternum length from the base of the labium to its most posterior point. Width taken across the widest point, usually between legs II and III (Fig. 12).

TSrd, TSp, TSr: number of tibia I spines on the distal most retrolateral, prolateral, and midline retrolateral positions.