Dromaeosaurus albertensis, Matthew & Brown, 1922

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

Dromaeosaurus albertensis

Although only the ventral edge of the maxillary portion of the antorbital fossa was preserved, it is clear that the antorbital fossa was strongly invaginated at least ventrally (e.g. Turner et al., 2012). The general consensus is that the skull of Dromaeosaurus albertensis was more robustly built than in most other dromaeosaurids (e.g. Norell & Makovicky, 2004; Turner et al., 2012), and so this distinctive skull shape might have influenced the shapes of the antorbital sinus, the promaxillary sinus and the maxillary antrum.