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Late Triassic megalodontids (Bivalvia) from the headwaters of the Yangtze River, Qinghai province, west China

Published online by Cambridge University Press:  14 July 2015

Huazhou Yao ,
Renjie Zhang ,
John Pojeta Jr. ,
Jinggen Sha  and
Jianxiong Wang
Huazhou Yao
Affiliation:
Yichang Institute of Geology and Mineral Resources, Ministry of Land Resources, Yichang, China 443003, 〈[email protected]〉
Renjie Zhang
Affiliation:
Yichang Institute of Geology and Mineral Resources, Ministry of Land Resources, Yichang, China 443003
John Pojeta Jr.
Affiliation:
U.S. Geological Survey and Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560, U.S.A.
Jinggen Sha
Affiliation:
Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing, China 20008
Jianxiong Wang
Affiliation:
Yichang Institute of Geology and Mineral Resources, Ministry of Land Resources, Yichang, China 443003
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Abstract

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.

Type
Research Article
Information
Journal of Paleontology , Volume 81 , Issue 6 , November 2007 , pp. 1327 - 1347
Copyright
Copyright © The Paleontological Society 

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