Comments

Orientation of the articulation margin of the occipital condyle relative to the convex caudoventral border of the basioccipital. The arrows point to a shallow cleft dividing the articulation margin of the occipital condyle from the caudal margin of the basioccipital. A, Ouranosaurus nigeriensis (cast of GDF 300), lateral view. B, Bactrosaurus johnsoni (AMNH 6365), lateral view. C, Amurosaurus riabinini (cast of AEHM 1/12), lateral view.

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