|中国辽宁早白垩世义县组一新的伤齿龙类化石——柯氏辽宁猎龙(Liaoningvenator curriei gen. et sp. nov.)
|关键词:troodontid new genus and species Early Cretaceous phylogenetic analysis western Liaoning
|基金项目:国家自然科学基金项目(编号: 41672019; 41272022);中国地质调查局地质调查项目(编号: DD20160126);中国地质科学院基本业务费项目(编号: JB1504)
|A New Troodontid Dinosaur (Liaoningvenator curriei gen. et sp. nov.)from the Early Cretaceous Yixian Formation in Western Liaoning Province
| A new troodontid, Liaoningvenator curriei gen. et sp. nov., is described based on a complete skeleton from the Early Cretaceous Yixian Formation of Beipiao City, Liaoning Province. It bears the following characteristics of Troodontidae: numerous and more closely appressed maxillary and dentary teeth; the teeth markedly constricted between the roots and crowns; the nutrient foramina in groove on the external surface of dentary; distal caudal vertebrae having a sulcus on the dorsal midline rather than a neural spine. Unlike other troodontids, Liaoningvenator exhibits a sub-triangular ischial boot in lateral view and slender ischial obturator process; transition point in caudal vertebrae starts from the seventh caudal vertebra. A phylogenetic analysis recovers Liaoningvenator and Eosinopteryx as sister taxa that belong to the same clade. These two taxa share the following three characteristics: (1) anterior maxillary and dentary teeth lack serrations along the anterior carina; (2) shafts of cervical ribs are longer than vertebral centra with which they articulate; and (3) anterior margin of ilium is straight. The histological study indicates that Liaoningvenator was attaining skeletal maturity and at least four years old when it perished. Liaoningvenator represents the fifth troodontid taxon from the Lower Cretaceous equivalent strata of western Liaoning. It provides much new anatomical information on basal troodontid dinosaurs in this region. It also enhances the diversity of the troodontids in Early Cretaceous of China currently known.
|HEN Cai-zhi.2017.A New Troodontid Dinosaur (Liaoningvenator curriei gen. et sp. nov.)from the Early Cretaceous Yixian Formation in Western Liaoning Province[J].Acta Geoscientica Sinica,38(3):359-371.
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