?Crossvallia waiparensis Left Humerus

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The left humerus of Crossvallia waiparensis Mayr et al. is characterized by a robust and elongated shaft, with prominent deltoid and supracondylar crests that provide attachment points for muscles and ligaments. A large, complexly shaped greater tubercle houses the insertion point for the long head of the supraspinatus muscle, while a smaller lesser tubercle accommodates the subscapularis tendon. The humeral head itself is broad and flat, with a distinctive "double-peak" morphology that suggests a powerful shoulder joint capable of generating significant torque and force. Overall, the left humerus of Crossvallia waiparensis exhibits many features typical of large, bipedal theropod dinosaurs.