Table of Content

15 September 1994, Volume 32 Issue 03

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NEW EARLY JURASSIC ACTINOPTERYGIANS FROM WEIXIN, YUNNAN

Su Dezao

1994, 32(03):  151-165. 

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The actinopterygian specimens described here were collected from Weixin, Yunnan by the Regional Geological Surveying Brigade of Guizhou Province. It was alleged that all the 25 specimens were discovered from "Xiangxi Formation" (Lower Jurassic). Four of them are assigned to a new genus and species, Weixiniscus microlepis, of the Palaeoniscidae. The others are referred to a new genus and species, Zaxilepis qinglongensis, of the Archaeomaenidae. Previously archaeomaenids were known only from Australia and Antarctica of Gondwanaland, this new discovery is of significance in the understanding of the distribution of Mesozoic freshwater fishes.

PHYLOGENETIC RELATIONSHIP OF HSISOSUCHUS

Wu Xiaochun, Li Jinling, Li Xuanmin

1994, 32(03):  166-180. 

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Summary can be seen in PDF.

ON A NEW PTEROSAUR (ZHEJIANGOPTERUS LINHAIENSIS GEN. ET SP. NOV.) FROM UPPER CRETACEOUS IN LINHAI, ZHEJIANG, CHINA

Cai Zhengquan, Wei Feng

1994, 32(03):  181-194. 

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THE DISCOVERY OF THE CRIBRIFORM PLATE IN SINOCONODON YOUNGI (TRICONODONTA, MAMMALIA)

Zhang Fakui, Du Xiangke Luo Dexin Jing Jinping Dai Liping

1994, 32(03):  195-199. 

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A skull of Sinoconodon youngi (Triconodonta, Mammalia) is scanned with a Toshiba TCT 80A CT scanner. On the computed tomography of the mesosagittal plane of the skull, an image between the braincase cavity and the nasal cavity indicates the existence of a cribriform place in the earliest mammals. The presence of a cribriform plate in living placenta Is and the marsupials and absence in monotremes may imply that mammals are diphyletic and the origin of cribriform plate took place within the Mammalia. But the conclusion came from the living mammals only, and has not been supported by palaeontological evidence. Its appearance in one of the oldest and the most primitive mammals, Sinoconodon, possibly suggests that the cribriform plate may occur earlier, i.e. in the time of the transition from the advanced mammal-like reptiles, Cynodontia, to the true mammals, and that the distribution of the cribriform plate in the Theria and the Atheria contradicts with the diphyletic of mammals.

A NEW SPECIES OF EUDINOCERAS (PANTODONTA, MAMMALIA) FROM SISHUI, SHANDONG PROVINCE

Wang Jun

1994, 32(03):  200-208. 

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A new species of Eudinoceras (Pantodonta, Mammalia) is described ih this paper. The material, including left and right maxillas and two upper canines, were collected from the Eocene of Sishui Basin, Shandong province in 1992. The new species is typified by its large size. Upper premolars have prominent conical protocones which are very close to paracones, and of almost the same height as paracones; protolophs and V -shaped lophs of metacones of molars are fully lophoid, mesostyles are isolated and conical, protocones and metacones are relatively lingually located.

THE LATE MIOCENE CERVIDAE FROM HOUNAO, YUSHE BASIN, SHANXI

Dong Wei, Hu Changkang

1994, 32(03):  209-227. 

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The fossil locality at Hounao, Yushe Basin, Shanxi Province, PRC, was first excavated in 1955 and 1956 by an IV PP reconnaissance team, and a considerable number of specimens of the Cervidae were collected. A new species Metatervulus lepidus was reported and described (Hu, 1962), but the rest specimens had not been studied in detail. Since the Sino-American joint project "Neogene Rocks and Faunas. Y ushe Basin, Shanxi, PRC" from 1987. the detailed study of fauna material has been under way. This paper presents the study on the Cervidae found at Hounao. one of the most fruitful locality in Shanxi. The sediments at Hounao are composed of fluvial deposits which are grouped into Mahui Formation (Qiu et al., 1987). The latter is dated by paleomagnetic analyses as about 5.4—5.8Ma, within the Late Miocene (Wu et al. 1992). The specimens referred in this paper are all registered and housed at the Institute of Vertebrate Paleontology and Paleoanthropology except the ones with other notice. The dental nomenclature used in this paper is based on that of Dong (1993).