Genus † Gigantohierax Arredondo & Arredondo

Type species. † Gigantohierax suarezi Arredondo & Arredondo, 2002a

Emended diagnosis. Accipitrid with relatively small humerus; carpometacarpus short and robust; femur pneumatic, short and wide, well compressed anteroposteriorly; supratendinal bridge of the tibiotarsus with some horizontal orientation; tarsometatarsus columnar, with wide and robust shaft, proximal foramina and distal foramen large, tubercle for tibialis anticus located well proximad and placed in a deep anterior metatarsal groove, lateral border rounded (or convex) along its extension, especially at the proximal region, trochleae forming a poorly pronounced arc in distal view; phalanx I, digit I, heavy, large and wide; ungual phalanges only slightly arched.