A new ornithomimid theropod from the Upper Cretaceous Bissekty Formation of Uzbekistan

<i>Dzharacursor</i> gen. nov. is established for the reception of <i>Archaeornithomimus</i>(?) <i>bissektensis</i> Nesov, 1995 from the Upper Cretaceous (Turonian) Bissekty Formation of Uzbekistan. <i>Dzharacursor bissektensis</i> is represented by cranial elements and many isolated postcranial bones that show considerable ontogenetic and some individual variation. Several of the morphological characters previously hypothesized as autapomorphies for <i>Qiupalong henanesis</i> and <i>Aepyornithomimus tugrikinensis</i> are found to be variable in the hypodigm for <i>Dzaracursor bissektensis</i>. <i>Dzharacursor bissektensis</i> is one of the oldest known ornithomimids in Asia. Phylogenetic analysis places this taxon at the base of the ornithomimid radiation, but more derived than <i>Archaeornithomimus asiaticus</i>.

建立新属*Dzharacursor*（gen. nov.），以归入由Nesov于1995年命名、暂归古似鸟龙属（Archaeornithomimus）的*bissektensis*种，该种化石发现于乌兹别克斯坦白垩纪晚期（土仑阶）的Bissekty组地层。模式种*Dzharacursor bissektensis*的标本包含颅骨遗骸与大量孤立的颅后骨骼，这些标本展现出显著的个体发育变异与部分个体间差异。此前被认为是河南丘布特龙（*Qiupalong henanensis*，原文为*henanesis*，系笔误）与*Aepyornithomimus tugrikinensis*的自衍征形态特征，在*Dzharacursor bissektensis*的标本群（hypodigm）中被发现存在变异。*Dzharacursor bissektensis*是亚洲已知最古老的似鸟龙科类群之一。系统发育分析显示，该分类单元位于似鸟龙科辐射演化的基部，但比亚洲古似鸟龙（*Archaeornithomimus asiaticus*）更为进步。