Table of Content

15 March 2001, Volume 39 Issue 01

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THE STRUCTURE OF PECTORAL FIN AND TAIL OF YUNNANOLEPIDOIDEI, WITH A DISCUSSION OF THE PECTORAL FIN OF CHUCHINOLEPIDS

ZHANG Guo-Rui WANG Jun-Qing WANG Nan-Zhong

2001, 39(01):  1-13. 

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Summary can be seen in PDF.

ARCTOSTYLOPID FOSSIL (MAMMALIA) OF CHANGTAO BASIN, HUNAN AND COMMENTS ON RELATED STRATIGRAPHY

HUANG Xue-Shi, ZHENG Jia-Jian, DING Su-Yin

2001, 39(01):  14-23. 

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The present paper deals with a new arctostylopid, Stenostylops Mangensis gen. et sp. nov., which was found in Changtao Basin, Hunan Province by local geologists in 1970 's. The new form sheds light on the age of fossil—bearing bed.

LATE EOCENE CTENODACTYLOIDS (RODENTIA, MAMMALIA) FROM QUJING, YUNNAN, CHIAN

WANG Ban-Yue

2001, 39(01):  24-42. 

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The diagnoses of Dianomys, D. obscuratus and D. qujingensis are revised based on new material. The tooth originally described as P4 of D. obscuratus is actually dP4, Ml/2 and ml/2 are Ml and m2 respectively, and the p4 refened to D. obscuratus is transferred to D. qujingensis. D. qujingensis differs from D. obscuratus not only by larger size, but also in having forked metaloph on upper cheek teeth, mesolophid on ml, and more developed accessory crests in the mesosinusid on p4. A new genus, Youngomys, is erected to include two new species (Y yunnanensis and Y. pisinnus) and Youngomys? sp. The main characters of Youngomys include: cheek teeth being long and low crowned, having obtuse main cusps and slender lophs; upper molar being longer than wide, having metaloph oblique to protocone and low entoloph; on lower molar rather posteriorly extended posterior arm of protoconid lacking lingual part, and arm of entoconid weak. Y. pisinnus differs from Y. yunnanensis in smaller size, cheek teeth being lower crowned and more bunodont, upper molar having more lingually positioned hypocone relative to protocone, distinct metaconule and metaloph separated from protocone. The phylogenetic relationships of the Paleogene Ctenodactyloidea are analyzed based on the dental features using PAUP 3.1. l. It seems that the evolutionary process of the molariforrn or non-molariform of the fourth premolars is complex and may have occurred parallel in different lineages. Youngomys has close relationship with Mergenomys. Dianomys is a ctenodactyloid and may be a sister group to Mergenomys + Youngomys group plus the Ctenodactylidae.

TWO PETROSALS OF GLIRIFORM MAMMALS FROM LATE OLIGOCENE OF TIEERSIHABAHE, XINJIANG UYGUR AUTONOMOUS REGION, CHINA

MENG Jin, WU Wen-Yu, YE Jie, Bl Shun-Dong

2001, 39(01):  43-53. 

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Two petrosals from the Late Oligocene of the northern Junggar Basin, Xinjiang Uygur Autonomous Region of China are described and are assigned to ?Yindirtemys and ?Sinolagomys or Desmatolagus based on sizes and morphologies. The unit formed by a fused bulla and petrosal, the spongy bullar wall and the anterior position of the entrance for the stapedial artery into the tympanic cavity indicate that petrosal A is most likely from an ochotonid. Absence of grooves and foramina for the internal carotid artery around the promontorium suggests petrosal B probably belongs to the ctenodactylid Yindirtemys. If the identifications are confirmed，these specimens represent the first records of ear regions in the two taxa.

LATE MIOCENE-PLIOCENE BIOSTRATIGRAPHY OF XIAOSHIGOU SECTION, LINGTAI, GANSU

ZHANG Zhao-Qun, ZHENG Shao-Hua

2001, 39(01):  54-66. 

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Summary can be seen in PDF.

THE FIRST REPTILLE FROM THE TONGCHUAN FORMATION ANF ITS STRATIGRAPHICAL SIGNIFICANCE

LIU Jun, WU Xiao-Chun, LI Jing-Ling

2001, 39(01):  67-71. 

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Several skeletons of fossil reptiles were collected for the first time from the Tongchuan Formation, Sangbi, Yonghe County, Shanxi Province in 1992. It represents the uppermost occurrence of terrestrial reptiles known from the Triassic of China. Our study on the local stratigraphy suggests that the fossils are from the upper part of Member II of the Tongchuan Formation. A preliminary study of the fossils indicates that they are monospecific and represent a previously unknown arehosauriform.

DISCOVERY OF COELODONTA ANTIQUITATIS FROM HUTOUIANG IN NIHEWAN BASIN

PEI Shu-Wen

2001, 39(01):  72-75. 

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Coelondonta antiquitatis Blumenbach, known as woolly rhinoceros of the glacials, lived widely in the north part of the Paleoarctic region during the Late Pleistocene. The material described in this paper was collected from Hutouliang, Yangyuan county, Hebei, China. It includes a nearly complete lower jaw with all cheek teeth (IVPP V 6769-3), the left P2~M3(V 6769-1), right P4~M3(V 6769-2), second and third right metacarpals (V 6769-5 and V 6769-4). Besides the characters of high-crowned cheek teeth with dense wrinkles on labial wall, strong crochet and crista, and the absence of antecrochet which can be grouped under Coelodonta antiquitatis, the material described here is characteristic of some features as: the largest tooth of upper cheek teeth M2 is nearly equal to M3, with a column tubercle in medisinus in M3 and short column tubercles in talonid grube of right m3.