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[dinosaur] Chinese stegosaurs + tracks from Cretaceous and Triassic of China + Mengbatrachus, new Cretaceous frog (free pdfs)

Ben Creisler

New papers with free pdfs in the October issue of Geological Bulletin of China (in Chinese):

HAO Baoqiao,PENG Guangzhao,QIN Gang,YE Yong & JIANG Shan (2018)
History and evolution of stegosaurs in China.
Geological Bulletin of China 37(10): 1777-1782Â (in Chinese)

Free pdf:

Stegosaurs is a medium-and large-class dinosaur with bony plates, the most obvious of which is the bizarre array of dermal plates and spines that extends along the body from the neck to the end of the tail. The earliest stegosaurus are known from the Middle Jurassic of Europe and China and they achieved a global distribution by the Late Jurassic, but subsequently waned in diversity during the Early Cretaceous. Fossils of stegosaurs in China include 9 main genera:Huayangosaurus, Tuojiangosaurus, Gigantspinosaurus, Chungkingosaurus, Chialingosaurus, Yingshanosaurus, Monkonosaurus, Jiangjunnosaurus, Wuerhosaurus. According to the characteristics of head, girdle, limb ratio and bone plate, Stegosaurus of China should have an evolutionary process from Huayangosaurus-Chungkingosaurus-Gigantspinosaurus-Tuojiangosaurus-Yingshanosaurus-Monkonosaurus-Wuerhosaurus.


TONG Kui, XING Lida, JIANG Xun, PENG Guangzhao, YE Yong, JIANG Shan, CHOU Chunyong, LI Ke & LI Zhiwu (2018)
New discovery of Cretaceous dinosaur track fauna in Xichang basin, Sichuan Province.
Geological Bulletin of China 37(10): 1771-1776 (in Chinese)

Free pdf:

The dinosaur fossils haven't been recorded in Cretaceous Xiaoba Formation in Xichang basin, Sichuan Province. Hence, the dinosaur footprints provide crucial information for improving the understanding of the Cretaceous dinosaur assemblages. In April 2007, the authors discovered a new dinosaur footprint assemblage in Xiaoba Formation at Luogan Township, Xide County. The Luogan tracksite is poorly preserved, but it contains abundant theropod tracks with basic morphological features. In general, the small the-ropod tracks (8~13cm) are characterized by moderate mesaxony (0.5~0.6) and wide divarication angles between digits â and IV (70Â~100Â), few of which developed metatarsal pads. The authors tentatively hold that the Luogan theropod assemblages are probably similar to Eubrontes and Grallator of Jiaguan Formation in Sichuan basin, which provides new evidence that these two areas had similar dinosaur faunae in Middle Cretaceous. This discovery is of great significance for paleoclimate, paleogeography and stratigraphic contrast in Xichang basin. Detailed classification of footprints needs further study.


ZHANG Jie,CHEN Lin,SHI Junbo,JIN Canhai & REN Guangming (2018)
Reptile trace fossils found in Middle Triassic Guanling Formation of northeast Yunnan area.
Geological Bulletin of China 37(10): 1798-1800Â

Free pdf:

In the Middle Triassic Guanling Formation in northeastern Yunnan, the authors discovered for the first time the footprints of the four-legged and five-toed reptile. These footprints are in a straight line, including large and small footprints, while large and small footprints appear in tandem. The shape of these footprints is very similar to that of human fingerprints. In general, the third toe is the longest and the thumb has an everted curve. It is initially judged as the footprint of "Chirotherium". This discovery is of great significance for studying the species, migration, movement patterns of the Mesozoic reptiles and the paleogeographic environment.


Mengbatrachus moqi gen. & sp. nov.

TAN Kai, LU Liwu, CHEN Xiaoyun & JIN Yuegao (2018)
A new Early Cretaceous Anuran amphibian from Northeast China.
Geological Bulletin of China 37(10): 1783-1788 (in Chinese)

Free pdf:

This paper describes a new genus of Early Cretaceous batrachian fossil discovered in Longjiang Group in Daur Autonomous Banner of Morin Dawa, east Inner Mongolia. The new type mainly has the following characteristics: The width is longer than the length of its head. There are lots of teeth on the maxillary and the premaxillary. Two nasals are connected in the middle line. The parasphenoid is like a stripe. The pterygoid is big. The squamosal and the surpascapula are all preserved well. The near-end place of the coracoid is obviously intumescentia. The new specimen has 8 opisthocoelous presacrals with developed transverse processes, and its second to the fourth presacrals have free ribs. Only the near-end places of the ribs are intumescentia. The sacral has hatchetshaped transverse processes. The urostyle has transverse processes at the near-end place. The tibiale and the fibulare cicatrize only at the near-end and the far-end places. This specimen is another new discovery of Mesozoic anuran fossils in China, in addition to Liaobatrachus.

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