and recurved with the posterior serrations being slightly larger than the anterior serrations. Along with the posterior serrations were 15 or 18 denticles per near the center of the teeth, although the anterior serrations had 17 to 20 denticles per . The dimensions of the maxilla suggest that Achillobator had a relatively large skull compared to those of carnosaurs. Postcranial skeleton The vertebral column was composed of large and robust cervical, dorsal, and caudal vertebrae. The anterior series of cervical vertebrae were sharply angled in development, with the anterior articulation facet of the centrum developed over the posterior facet. These characteristics are interpreted as indicators of an S-shaped neck, as seen in most maniraptorans. The dorsal vertebrae were stocky and had pleurocoels at the lateral surfaces, increasing in posterior vertebrae. Their central articulation facets were rounded and concave in shape. The neural processes of the dorsal vertebrae show resemblance to those of large ratites such as the extinct moa and extant emu, ostrich, and cassowary, and they had protruding interspinous ligaments scars that indicates a robust and similar back to those birds. In all , the centrum was amphiplatian (flat on both ends) with the posterior articulation facet being more concave than the anterior one. As indicated by a transitional caudal, the anterior neural spines were elongated and progressively disappeared on posterior caudals. The posterior series of caudals was articulated with long chevrons and had very elongated (projections of the vertebral arch that connect adjacent vertebrae). The scapulocoracoid was formed by the fusion of the scapula and coracoid. In the posterior area of the acromion process, the scapula had a small tubercle that attached the area for the muscle m. scapulohumeralis in life. The glenoid was located at the bottom area facing to the lateral side. The scapula was relatively elongated and flattened at the scapular blade. The blade is thickened and slightly curved to the inner side following the rounded shape of the rib cage. The coracoid is robust and broad, measuring long and in height. The anterior edge had a coarse texture, likely for the articulation with cartilaginous tissue. A large foramen was located from the front to the back, probably acting as a channel for blood vessels and nerves. The radius measured long. The femur was highly robust and longer than the tibia, a rare trait in dromaeosaurids, measuring in length. On the anterior inner surface, there