Tsaagan mangas

Brownstein, Chase Doran, 2021, Dromaeosaurid crania demonstrate the progressive loss of facial pneumaticity in coelurosaurian dinosaurs, Zoological Journal of the Linnean Society 191 (1), pp. 87-112 : 97

Tsaagan mangas

Similar to Velociraptor mongoliensis , but unlike the condition in Deinonychus antirrhopus , the edges of the antorbital fossa on the maxilla of Tsaagan are all strongly undercut, suggesting the antorbital sinus was fully constrained to the antorbital fossa. The anterior migration of the maxillary fenestra and the presence of an additional fenestra in the antorbital fossa in Tsaagan also suggest the morphology of the diverticula of the antorbital sinus in this taxon was distinctive from that in Deinonychus and Velociraptor . However, the robustly built maxilla of Tsaagan may have supported a dorsoventrally wider antorbital sinus than that of Velociraptor ( Fig. 4A ).

Figures

Figure 4. Reconstruction of the antorbital sinus in coelurosaurs. The second sentence in the figure caption should read: Skulls of (A) Velociraptor, (B) Tsaagan, (C) Tyrannosaurus, (D) Deinonychus, (E) Saurornithoides, and (F) Khaan. Antorbital sinus in blue, with location of the maxillary fenestra in black and promaxillary fenestra in yellow. Photo of Deinonychus courtesy of the Division of Vertebrate Paleontology, Peabody Museum of Natural History.