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A NEW SPECIES OF VELOCIRAPTOR (DINOSAURIA: DROMAEOSAURIDAE) FROM THE UPPER CRETACEOUS OF NORTHERN CHINA
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.
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.