The re -evaluation of the Lai Shilong Ya family dinosaurs at the end of the Baiji Ji of Heilongjiang Basin

Journal of Vertebrate Paleontology (JOURNAL of Vertebrate Paleontology (JVP) recently published online entitled "Olunchun Heilongjiang Dragon (Dinosaur Dalbill Dragon Academy) of the Northeast China Baiji Tongyu Liangzi Group Oluncho Group) Evaluation of academic papers. The research work was jointly completed by the paleontological innovation team led by the Beijing Natural Museum Zhang Yuguang, and the researchers of the Heilongjiang Provincial Geological Museum and the Jiayin Dinosaur Museum;

Figure 1 The bone reconstruction (Xing Hai/Figure)

Figure 2 Amur Dalonic Skulls found in the Ulara Gate of Heilongjiang Basin (Xing Hai/Figure)

In this article, scientific researchers found in the Old Chun Ronglong River Dragon (Dinosauro Laishi Dragon Yako) in the upper part of the Ularaga in the Heilongjiang Basin in my country (Wulaga) Re -evaluation of detailed osteenology and classification. Through the comprehensive comparison of global duckbill dragon supercience fossil materials, the author gradually identifies a series of dinosaur fossils in Laraga in the Ulaga region (mostly before it was classified as Sahaliyania Elunchunorum, Olengchun Heilongjiang Dragon) and produced in Bula, Russia Blagoveschensk (Blagoveschensk) at the same time, the shared features between the Rician Amurosaurus Riabinini specimen in the Udurukan group. These shared osteenology characteristics include the large pores of the upper jaw bone covered by the abdomen connected by the cheekbones, the narrow cheekbone lower temporal area (70%of the width of the orbital), and the top bone vector along the lower abdomen to the lower abdomen to the lower abdomen. One -quarter part of the spine, the upper jaw teeth (containing 1.2 teeth per centimeter) in the near -distance direction, the outer bone that is slightly shorter than the back of the inner plate, and the intestinal bone with slightly rotating the abdomen to the abdomen. Acetabular forward. In view of the presence of the same period and the existence of the above -mentioned orthopedic similarity in the same period of the Huguko Group and the Udurukan group in the Heilongjiang River Basin, the existence of the above -mentioned osteenology similarity Different names. As a result, the Species Richness of the Black Baiya Dinosaur Biological Group should be much lower than what I thought before.

Figure 3 The Ulaga location observed under the light of the Ulaga Place Alumarlon Fibody Tissue Slip (Xing Hai/Figure)

Among the BONE BEDs of Ulaga, about 70%of the complete Alumuron fibula length is greater than 85 cm. The tissue slices of these fibula show the moderate reconstruction of the primary bone unit of the dense secondary osteons as well as the moderate reconstruction of the Secret Cortex Fibrolamellar Bone Tissue. This information confirms that most of the Ulagam fibula specimen should be in adulthood. Based on the results of the statistical analysis of bone tissue observation and fibula measurement data, scientific researchers speculate that the Alumurlon population in the Ulaga area is likely to be dominated by adult individuals. This situation has a significant difference in the Alumurlon population structure in the Land of Blagovovesk, Russia, and indirectly supports the hypothesis of "large bird hip dinosaur groups produce significant age divisions between high and low latitudes." The development analysis of Lambeosaurinae system based on the largest minimalist method discovered the relationship between the sister group between Amurlon in Heilongjiang Basin and Laishilong, North America. Lambeosaurini also obtained a higher branch relationship resolution in this analysis.

Figure 4 The ecological restoration of the Alumurlon population in the Northeast Ulaga area in my country (Xing Hai/Figure)

The output of this research results benefits from the National Natural Science Foundation of China, the Canadian Natural Science Foundation, the Beijing Natural Science Foundation of China, the Beijing New Century Talent Project, the Beijing Natural Museum of Natural Museum of Beijing, and the State of the Ministry of Science and Technology The key laboratory open topics and the special funding for the special funding of the Boyb youth Department of the Canadian Museum of Nature in Canada.

Article link:

https://www.tandfonline.com/doi/full/10.1080/02724634.2021.2085111

(Beijing Natural Museum)

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