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Comparison of the left angulars, surangulars, and articulars of Parahesperornis (KUVP 2287; (1) and Hesperornis (KUVP 71012; (2) in medial (A), dorsal (B), lateral (C), and ventral (D) views. Specimens are scaled to be of similar size and aligned at the medial cotyla of the articular.
