Fig. 57 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 57. Manual phalanx III:1 of (A) Sterna maxima and (B) Crypturellus undulatus compared to that of Ichthyornis dispar (C) as reconstructed by Marsh (1880) and (D) as preserved in YPM 1775. The distal ends of the phalanges in D (YPM 1775) are missing. The flexor process of III:1 (B, D) is prominent in Ichthyornis dispar (contra Marsh, 1880) and in Crypturellus undulatus.