Etymology—Named in honor of Halszka Osmólska, for her contributions toward understanding of Asian theropods.
Holotype—IMM 99NM–BYM–3/3 (A–C), paired maxillae and left lacrimal.
Locality and Horizon—15 km north of Bayan Mandahu Village, quarry SBDE 99BM–III (N 41° 47 17.3, E 106° 43 26.1), Urad Houqi, Bayan Nor League, Inner Mongolia Province, P. R. China (Fig. 1). Bayan Mandahu Formation, correlated with the Djadokhta Formation in Mongolia, Campanian, Late Cretaceous.
Diagnosis—Long rostral plate of maxilla, with elongation index (L/H ratio)1.38. Promaxillary fenestra subequal in size to the maxillary fenestra and teardrop-shaped; long axis of the promaxillary fenestra perpendicular to the dorsal border of the maxilla; long axis of maxillary fenestra parallel to this border. Ten maxillary teeth with short unserrated carina on the apical end of the mesial edge and with incipient serrations on the distal carina.
Velociraptor osmolskae, from the Bayan Mandahu Formation (Campanian; Inner Mongolia, P. R. China). A–D, left maxilla (IMM 99NM–BYM–3/3A) in lateral (A–B) and medial (C–D) views; E, right maxilla in lateral view.
Description - A new dromaeosaurid dinosaur—Velociraptor osmolskae n. sp.—is described on the basis of associated paired maxillae and a left lacrimal discovered in Campanian (Upper Cretaceous) deposits at Bayan Mandahu (Inner Mongolia, P. R. China). The maxilla of this new taxon is characterized by its long rostral plate and its enlarged, teardrop-shaped promaxillary fenestra, which is as large as the maxillary fenestra. The teeth are robust and the serrations are weakly developed on their distal carinae. This new taxon appears more closely related to Velociraptor mongoliensis, from the Campanian Djadokhta Formation in Mongolia, than to other dromaeosaurids described to date. The identification of the Bayan Mandahu Velociraptor as a distinct species is in keeping with the taxonomic distinction of the entire dinosaur fauna of this locality. Minor regional differences among Djadokhta-like localities in regards to their dinosaur faunas may reflect either some kind of geographic isolation, or small differences in their age or in their paleoenvironment.
Left lateral views of dromaosaurid maxillae. A, Velociraptor osmolskae; B, Bambiraptor feinbergi; C, Atrociraptor marchalli; D, Velociraptor mongoliensis; E, Saurornitholestes langstoni; F, Deinonychus antirrhopus; G, Achillobator giganticus; H, Dromaeosaurus albertensis; I, Tsaagan mangas; J, Sinornithosaurus millenii. Scale bars equal 1 cm.
References Godefroit, Currie, Hong, Yong, &
Dong, 2008. A new species of Velociraptor (Dinosauria: Dromaeosauridae) from the Upper
Cretaceous of northern China, Journal of Vertebrate Paleontology 28(2):432–438