Fig. 43 in Morphology, Phylogenetic Taxonomy, And Systematics Of Ichthyornis And Apatornis (Avialae: Ornithurae)

Fig. 43. The caudal vertebrae of Ichthyornis dispar (YPM 1732): (A) the third free caudal in dorsal view and the (B) incompletely preserved fused, distal caudals (pygostyle) in right lateral view. In A, the morphology of elongate prezygapophyses, and the absence of projected postzygapophyses (developed as facets) are indicated.