the shaft expands into a knob-like pubic boot like other loricatans, though it is much smaller than that of relatives such as Saurosuchus and Postosuchus. Like the ilium, the ischium is another bone which is distinctive in Prestosuchus. It is thicker than the pubis and makes a larger contribution to the acetabulum. Prominent crests are developed along the dorsal (upper) and ventral (lower) edges of the ischium. A large midline ventral crest is only seen in P. chiniquensis, P. nyassicus, and Batrachotomus among loricatans. However, Batrachotomus's crest smoothly transitions from the base of the ischium to the shaft, whereas an abrupt angled incision is observed in this area for P. chiniquensis and P. nyassicus. The paired dorsal ridges are autapomorphies of Prestosuchus, though they extend further down the shaft in P. chiniquensis than P. nyassicus. They are edged by long depressions and separated by a shallow groove on the midline of the ischium, where the left and right ischia have fused. As with other loricatans, the tip of the ischial shaft is slightly expanded into an ischial boot. The femur is very robust, without a clear neck leading from the shaft of the bone to the head. The fourth trochanter manifests as a low, rough area rather than the pronounced knob or ridge present in most other archosaurs. With the exception of having a tapering (rather than rounded) medial condyle, Prestosuchus generally resembles other loricatans in the structure of the femoral head and distal condyles. The tibia is shorter than the femur but thick and expanded near the knee. A deep pit is present on the postero-medial portion of its upper expansion, as also observed in Procerosuchus and Batrachotomus. The fibula is much more slender, developing a large knob-like iliofibularis muscle scar as in various other pseudosuchians. Near the heel, a deep depression is present on the rear of the fibula. This depression is an autapomorphy of Prestosuchus, being lunate (crescent-shaped) in P. chiniquensis and elongated in P. nyassicus. Prestosuchus has a "crocodile-normal" crurotarsal ankle, with a convex-concave suture between the astragalus and calcaneum. The astragalus has a large tibial facet and small fibular facet on its upper surface, a curved depression on its front surface, and facets for distal tarsal III and metatarsals I-II on its lower surface. The calcaneum is wide and has a convex fibular knob and calcaneal tuber, as with other crurotarsal archosaurs. The calcaneal tuber