Renjie Zhang
John Pojeta
Jinggen Sha
Jianxiong Wang
Huazhou Yao
2007
<p><span>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, </span><span class="italic">Neomegalodon cornutus</span><span> and </span><span class="italic">Quemocuomegalodon circularis</span><span>, are described. The type species of </span><span class="italic">Quemocuomegalodon, Q. orientus</span><span>, is revised. </span><span class="italic">Quemocuomegalodon orientus</span><span> 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 </span><span class="italic">Q. longitatus</span><span>, Yao, Sha, and Zhang (2003) is now placed in synonymy with </span><span class="italic">Q. orientus.</span><span> There are significant morphologic differences between the external appearance of shelled specimens and the internal molds of species of </span><span class="italic">Quemocuomegalodon.</span><span> This suggests the need for the re-evaluation of many megalodontid species from elsewhere that are known only from internal molds.</span></p>
application/pdf
10.1666/05-152.1
en
The Paleontological Society
Late Triassic megalodontids (Bivalvia) from the headwaters of the Yangtze River, Qinghai province, west China
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