Table of Content

15 March 2000, Volume 38 Issue 01

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DISCUSSION ON THE PROBLEMS OF K/T BOUNDARY IN THE NANXIONG BASIN

YE Jie

2000, 38(01):  1-9. 

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DIPODIDAE (RODENTIA, MAMMALIA) FROM THE LOWER MEMBER OF XIANSHUIHE FORMATION IN LANZHOU BASIN, GANSU, CHINA

WANG Ban-Yue， QIU Zhan-Xiang

2000, 38(01):  10-35. 

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The dipodid fossils from the red mudstone of the Lower Member of the Xianshuihe Formation include eight species of four genera: Parasminthus asiae—centralis, P. tangingoli, P. parvulus, Parasminthus sp. I, Parasminthus sp. II, Ltodontomys huangheensis gen. et sp. nov., Heterosminthus lanzhouensis sp. nov., and Sinosminthus sp. The new genus Litodontomys can be diagnosed as: having proportionally wider and shorter cheek teeth, with simpler occlusal pattern, well developed lophids, mesolophid short or absent, ectolophid extending from protoconid. The new species Heterosminthus lanzhouensis represents a primitive species of Heterosminthus. The main cusps of its molars are slightly alternate in position. The protoconule is distinct but the anterostyle is absent on Ml/ 2. ml has developed mesolophid, bending ectolophid, and antero-buccally oblique ectomesolophid. The dipodids described above are similar to those of Taben buluk in composition. The middle part of the lower red mudstone beaHng the dipodids may be equivalent to that of the latter in age. It is of late Oligocene. The phylogenetic relationships or the Paleogene dipodids are analyzed based on dental features using PAUP 3.1. l. The predominance of the dipodids in the late Oligocene micromammals in the Lanzhou Basin indicates that a grassland or savanna habitat might have been established in the Lanzhou area during that time.

THE DISCOVERY OF LATE OLIGOCENE DORMICE FROM CHINA

WU Wen—Yu, YE Jie, BI Shun—Dong, MENG Jin

2000, 38(01):  36-42. 

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During the field work of 1998 in the north Junggar Basin of Xinjiang Uygur Autonomous Region, rich fossils were found from the Ulunguhe Formation which was originally dated as Cretaceous in age. Probe sample of ca. 400kg for screenwashing was taken from locality XJ98024 north of Tieersihabahe. From about 1.0kg of residue 170 teeth of micromammals were sorted out, altogether 31 species belonging to 21 genera, 17 families and 7 orders have been recognized in this fauna, many of which are elements of the late Oligocene fauna of Taben buluk. Four teeth of them belong to dormice, which were identified as Glirulus sp. and Gliridae gen. et sp. indet. Therefore the dormice from Tieersihabahe are the earliest dormice found in China, the first recovery of Oligocene dormice from China and the Glirulus sp. is the earliest record of this genus.

ERINACEIDAE FROM THE EARLY MIOCENE OF NORTH JUNGGAR BASIN, XINJIANG UYGUR AUTONOMOUS REGION, CHINA

BI Shun—Dong

2000, 38(01):  43-51. 

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A large sample Of insectivores was collected from the Suosuoquan Formation Of Chibaerwoyi, north Junggar Basin, Xinjiang Uygur Autonomous Region, China in the summer of 1995 and 1996. Of these materials, Metexallrix has been described (Bi, 1999). This is a report on two species of Amphechinus from this locality. Although all these new materials only consist Of incomplete fragments Of lower jaws with or without teeth, a large sample now available provides information of dental variability.

NEW SPECIES OF LEPTARCTUS (CARNIVORA, MUSTELIDAE) FROM THE MIOCENE OF NEBRASKA, USA

LIM Jong-Deock, MIAO De Sui

2000, 38(01):  52-57. 

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A new species of Leptarctus is described on the basis of a well— preserved skull from the North American Miocene. Leptarctus is only known from the Miocene of Nei Mongol (Inner Mongolia) and North America. The new specimen differs from other species in having an unusually enlarged upper dentition and a hooked process on the tympanic bullae. The third upper incisors are caniniform and are curved toward the canine. The dental characters of this new species indicate it had omnivorous diet.

LATE MIOCENE-EARLY PLEISTOCENE MICROMAMMALS FROM WENWANGGOU OF LINGTAI, GANSU, CHINA

ZHENG Shao-Hua, ZHANG Zhao-Qun

2000, 38(01):  58-71. 

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Summary can be seen in PDF.