Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

Journal of Paleontology

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by YAO, H. Articles by WANG, J. Search for Related Content GeoRef GeoRef Citation

LATE TRIASSIC MEGALODONTIDS (BIVALVIA) FROM THE HEADWATERS OF THE YANGTZE RIVER, QINGHAI PROVINCE, WEST CHINA

¹ Yichang Institute of Geology and Mineral Resources, Ministry of Land Resources, Yichang, China 443003, ycyhuazhou{at}cgs.gov.cn,
² U.S. Geological Survey and Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, U.S.A.,
³ Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing, China 20008

A bivalve faunule of six species is described from the Upper Triassic Jiapila Formation at the headwaters of the Yangtze River, southern Qinghai, China. The new species, Neomegalodon cornutus and Quemocuomegalodon circularis, are described. The type species of Quemocuomegalodon, Q. orientus, is revised. Quemocuomegalodon orientus Yao, Sha, and Zhang (2003) is now known from abundant, well-preserved specimens that show great variation in shape, size, thickness of shell, and dentition, and the species Q. longitatus, Yao, Sha, and Zhang (2003) is now placed in synonymy with Q. orientus. There are significant morphologic differences between the external appearance of shelled specimens and the internal molds of species of Quemocuomegalodon. This suggests the need for the re-evaluation of many megalodontid species from elsewhere that are known only from internal molds.