Table of Content

15 September 1998, Volume 36 Issue 03

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REEXAMINATION OF TUNGTINGICHTHYS (PISCES, PERCIFORMES) FROM HUNAN PROVINCE, CHINA

CHANG Mee-mann, LIU Huanzhang

1998, 36(03):  173-196. 

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The Eocene percifonn Tungtingichthys has been found widely spread over eastern and southem China Since the genus was first established by Liu et al. (1962), five species (T. gracilis, T. hsiawanpuensis, T. laianensis, T hongzeensis, and T. eocaenus) have been described from Hunan, Anhui, Jiangsu, Guangdong, Shandong and Liaoning Provinces (fig. 1). Most of the specimens are preserved in oil shale and are very difficult to prepare and for this reason previous descriptions are in many ways incomplete. The purpose of this paper is to redescribe the type species of the genus, T gracilis, based on newly prepared specimens collected from Hunan Province, to review their systematics and to compare Tungtingichthys with contemporaneous perciforms from other continents. The specimens used in this study include those from the collections of the IVPP and those newly collected by the senior author and her colleagues in 1991 from the type locality of the type species, i.e. Sanbanqiao (village), Shimen (town), Linli county, Hunan Province. After trying different ways of preparation with no success most of specimens are prepared mechanically with a thin needle. One of them (VI 1367) is prepared by transfer method.

PATTERN OF DENTAL REPLACEMENT OF SINOCONODON AND ITS IMPLICATION FOR EVOLUTION OF MAWVIALS

ZHANG Fakui, Alfred W. CRONfPTON, LUO Zhexi, Charles R. SCHAFF

1998, 36(03):  197-217. 

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This paper reports new features of the dentition of Sinoconodon, an Early Jurassic mammal from the lower Lufeng Formation of Yunnan, China. Incisors and canines were replaced multiple times in Sinoconodon as in many non-mammalian cynodonts. New juvenile specimens of Sinoconodon have premolars which were replaced once before being permanently lost in the larger (thus older) specimens. Differentiation of premolars from molars and a single replacement of premolars are the derived features of modem mammals. The anterior molars (Ml— M2) were probably lost without replacement. The posterior molars (M3— MS) were replaced once. The skull experienced indeterminate growth while the teeth were being replaced in adult specimens. Sinoconodon is the sister taxon to all other mammals. The dental replacement of Sinoconodon could be interpreted as an intermediate stage in the character evolution from the primitive pattern of polyphyodont replacement seen in most cynodonts to the derived diphyodont replacement of mammals. From the polyphyodonty replacement and the substantial growth of the adult skulls of Sinoconodon, we infer that this taxon lacked the lactation and determinate growth typical of living mammals.

CARNIVORA FROM MIDDLE MIOCENE OF NORTHERN JUNGGAR BASIN, XINJIANG AUTONOMOUS REGION, CHINA

WANG Xiaoming, YE Jie, MENG Jin, WU Wenyu, LIU Liping, Bl Shundong

1998, 36(03):  218-243. 

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MICROSTRUCTURE ANALYSIS IN TSAGANOMYS ALTAICUS AND EOSISCLYROMYS INCISOR ENAMEL

OUYANG Lian

1998, 36(03):  244-251. 

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Summary can be seen in PDF.

DINOSAUR REMAINS FROM DATONG SUBURB, SHANXI PROVINCE

LÜ Junchang, HU Ping

1998, 36(03):  252-256. 

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Three kinds of dinosaurs were collected from Xinrong District, Datong suburb. They belong to Sauropoda indet., Allosaursus sp. and Iguanodontidae indet. The geological era of this dinosaur bearing stratum perhaps belongs to Late Jurassic.