Figure 21. Probactrosaurus gobiensis Rozhdestvensky, 1966. PIN 2232 in On Asian ornithopods (Dinosauria: Ornithischia). 4. Probactrosaurus Rozhdestvensky, 1966

Figure 21. Probactrosaurus gobiensis Rozhdestvensky, 1966. PIN 2232/10. Sternal bone (left) in external aspect. The anterior end is thickened and capped by cartilage, the medial edge becomes increasingly thin posteriorly. The oblique posterior process has a bifaceted tip for attachment of presumed cartilaginous sternal ribs. Abbreviations: cs = surface for attachment to a coracosternal cartilage; r.f = facets for attachment of sternal ribs.