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1.
A new theropod dinosaur, Shidaisaurus jinae gen. et sp. nov., has been described on the basis of an incomplete skeleton. The specimen was found near the base of the Upper Lufeng Formation (early Middle Jurassic) in Yunnan, China. It is the first theropod dinosaur from the Middle Jurassic of Yunnan. Shidaisaurus jinae is distinguishable from other Jurassic theropods by certain features from the braincase, axis, and pelvic girdle. The absence of any pleurocoels in the axis or in any anterior dorsal vertebrae suggests that the new Lufeng theropod is relatively primitive and more plesiomorphic than most of the Middle to Late Jurassic theropods from China. Most Chinese taxa of Jurassic theropod dinosaurs have not been well described; a further detailed study will be necessary for us to determine their phylogenetic relationships with Shidaisaurus jinae. 相似文献
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记述了云南省禄丰县腰站乡下侏罗统禄丰组2个恐龙足迹,命名了棋盘张北足迹（Changpeipus pareschequier ichnosp. nov.）一新种。这是在禄丰组中首次发现恐龙足迹化石,重新观察并修订了张北足迹一属的属征。滦平张北足迹（Changpeipus luanpingeris）应为石炭张北足迹（Changpeipus carbonicus）的亚成年个体,为同物异名。此前被认为是石炭张北足迹（Changpeipus carbonicus）前足迹的IVPP V2472 2a,应为其未成年体的后足迹。张北足迹与卡岩塔足迹（Kayentapus）类似。综合种种特征,棋盘张北足迹（新种）的造迹恐龙很可能为禄丰组的腔骨龙类（Coelophysoidea） 相似文献
3.
An incomplete dinosaur skeleton,including a partial skull,recently discovered from the Lower Jurassic Lufeng Formation of Yunnan,China,is here reported.Apart from its small size,little anatomical evidence supports,a priori,the non-adult status of this new sauropodomorph specimen but osteohistological analyses suggest that it is a fast-growing juvenile. This specimen represents only the second occurrence of a juvenile non-sauropodan sauropodomorph in the Lufeng Basin. The anatomy of the new specimen does not match that of other Lower Jurassic immature specimens;although cranial material is preserved,it does not display the diagnostic characters of early sauropodomorphs from the same horizon,namely Lufengosaurus,Yizhousaurus and Yunnanosaurus.Our phylogenetic analysis places the new specimen in a position relatively distant from other Chinese sauropodomorphs,and corroborates the anatomical evidence showing it is not referable to any known species already excavated in Yunnan.This result is interpreted with caution considering that ontogeny affects phylogenetic reconstruction.A thorough comparison with adult forms,taking into account ontogeny-related characters,suggests that this Lufeng juvenile might represent a previously unknown species of early sauropodomorph. 相似文献
4.
Li-Da Xing Jin Ba Martin G.Lockley Hendrik Klein Sheng-Wu Yan Anthony Romilio Chun-Yong Chou W.Scott Persons IV 《古地理学报》2018,(1)
Upper Triassic and Middle Jurassic strata of the Xichang Basin in Sichuan Province, southwestern China, yielded important dinosaur ichnofossils. From the Xujiahe Formation of the Yiguojiao tracksite, we report a Late Triassic footprint assemblage in China and the first discovery of diagnostic Triassic sauropodomorph tracks in this region. The tracks share a number of features in common with the ichnogenera Eosauropus(Late Triassic) and Liujianpus(Early Jurassic). The neighboring Bingtu tracksite is stratigraphically younger(Shaximiao Formation, Middle Jurassic) and preserves small tridactyl theropod tracks that represent the first occurrence of the ichnotaxon Carmelopodus in China and Asia. While these tracks are morphologically comparable to those from the Middle Jurassic type locality in North America, the specimens from China show the proximal margin of the digit IV impression in a more cranial position, which may indicate a trackmaker with a relatively short metatarsal IV. In addition to the skeletal record, the Carmelopodus footprints document the presence of small theropods in the dinosaur fauna of the Middle Jurassic Shaximiao Formation. 相似文献
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云南禄丰下侏罗统下禄丰组产出一新的原蜥脚类孙氏细细坡龙(Xixiposaurus suni gen.et sp.nov.),其特征为:侧视头骨背缘向前强烈倾斜,下颌高度大于齿骨最小高度的两倍,颈椎体中第四颈椎体最长,耻骨裙宽度大于肠骨的耻骨突,股骨第四转子侧视具有V形切口。其系统位置比较进步,是禄丰发现的原蜥脚类中最进步的一种。 相似文献
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Xing Lid Ariana Paulina-Carabajal Philip J. Currie Xu Xing Zhang Jianping Wang Tao Michael E. Burns Dong Zhiming 《《地质学报》英文版》2014,88(6):1653-1664
The neuroanatomy of the mid-sized theropod Sinosaurus triassicus from the Lower Jurassic Lufeng Formation, Lufeng Basin in Yunnan Province, China was studied using X-ray computed tomography. The braincase is characterized by a large supraoccipital knob that is capped by a posterior projection of the parietal and two external foramina for the caudal middle cerebral vein, which is completely enclosed by the supraoccipital. The basicranium has well defined, short basipterygoid processes that project ventral to the basal tubera. The basisphenoid is expanded, projects posteroventrally, and is pierced by four pneumatic recesses. The endocranial morphology resembles that observed in other basal theropods—in particular some allosauroids—and has a strongly marked pontine flexure and a large dorsal expansion. The inner ear morphology is also similar to that observed in other basal theropods, with slender semicircular canals. The anterior semicircular canal is 20% larger than the posterior semicircular canal, and the angle formed between them is less than 90° when seen in dorsal view. 相似文献
7.
藏东昌都地区阿涅塘化石点中侏罗世达布卡组滨湖相紫红色中-细砂岩中,发现以凸形迹完好地保存的4层恐龙足迹,包括Grallator类、大型兽脚类、小型兽脚类和小型蜥脚类等足迹类型,并构成两列完美的行迹. 组成行迹T1的4个Grallator类足迹被命名为Grallator anietangensis isp. nov.,对其进行了详细的形态学分析,并讨论了造迹恐龙的大小和运动状态,这是Grallator类足迹在西藏地区的首次发现. 组成行迹T2的9个大型兽脚类足迹被归为Theropoda igen. et isp. indet.,对该类足迹进行了形态描述和功能分析;这类足迹在中国是首次记录,其连续且清晰的尾迹表明造迹者并非处于正常运动状态,而是应对某种特殊境况的特别行为方式,即其正以昂起的前躯一边观察,一边以极低的速度前进,因前躯昂起,尾部相应下垂,从而留下尾迹. 两列行迹均显示出造迹者正沿古昌都湖岸前进. 中国迄今所发现的恐龙骨骼和Grallator类足迹化石主要表现为以西南地区为中心,再向四周不断发散的扩散模式,但Grallator类足迹化石综合提供的信息显示恐龙动物的扩散速度比骨骼化石反映的速度更快. 相似文献
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LUO Yaonan Sichuan Bureau of Geology Mineral Exploration Development Chengdu Sichuan WANG Changsheng Yuzhou University Chongqing 《《地质学报》英文版》2000,74(2):132-136
The paper describes an early and primitive sauropod dinosaur, Gongxianosaurus shibeiensis (gen. et sp. nov.), from the Dongyuemiao Member of the Lower Jurassic Ziliujing Formation in Shibei Township, Gongxian County, Sichuan Province, China, which is one of the 5 dinosaur fossils discovered in Gongxian in 1997. Except the skull which is incomplete, the fossils are well preserved. It has some features of both sauropods and prosauropods. It is an intermediate type in the evolution of dinosaurs from prosauropods to sauropods and provides materials for the study of the origin and evolution of the sauropod dinosaur fauna. The discovery of this new sauropod furnishes a way for the stratigraphic correlation between the Early Jurassic Ziliujing Formation in the Sichuan basin and the Lower Jurassic Lufeng Formation in the Central Yunnan basin. 相似文献
10.
云南禄丰中侏罗世弓鲛（软骨鱼类）化石新材料 总被引：1，自引：1，他引：0
后句弓鲛(Hybodus houtienensis Young 1941)是中国发现最早的弓鲛鱼类之一,由杨钟健建立。由于建种的化石材料均为破碎的鳍棘,因此与其他弓鲛鱼类难以进行较全面的对比。本文依据在禄丰川街盆地发现的新化石材料,对后甸弓鲛进行再研究,补充了描述、修订了其特征,并讨论了弓鲛属的生物地层和地理分布特征。 相似文献