Fig. 4 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 4. Apomorphies of Ichthyornis dispar. Numbers 1–9 correspond to the characters used in the diagnosis and are indicated for the following specimens: (1) YPM 1775, left quadrate, anterior view; (2) YPM 1733, a posterior cervical vertebrae, posteroventral view; (3) YPM 1732 caudal vertebrae, dorsal view; (4) YPM 1718, right scapula, dorsal view; (5) YPM 1450, left humerus, posterior view;