Short-Snouted Toothless Ichthyosaur from China Suggests Late Triassic Diversification of Suction Feeding Ichthyosaurs

P. Martin Sander; Xiaohong Chen; Long Cheng; Xiaofeng Wang

doi:10.1371/journal.pone.0019480

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Research Article

Short-Snouted Toothless Ichthyosaur from China Suggests Late Triassic Diversification of Suction Feeding Ichthyosaurs

P. Martin Sander ,

* E-mail: martin.sander@uni-bonn.de

Affiliation Steinmann Institute, Division of Palaeontology, University of Bonn, Bonn, Germany
⨯
Xiaohong Chen,

Affiliation Wuhan Institute of Geology and Mineral Resources (formerly Yichang Institute of Geology and Mineral Resources), Hubei, China
⨯
Long Cheng,

Affiliation Wuhan Institute of Geology and Mineral Resources (formerly Yichang Institute of Geology and Mineral Resources), Hubei, China
⨯
Xiaofeng Wang

Affiliation Wuhan Institute of Geology and Mineral Resources (formerly Yichang Institute of Geology and Mineral Resources), Hubei, China
⨯

Short-Snouted Toothless Ichthyosaur from China Suggests Late Triassic Diversification of Suction Feeding Ichthyosaurs

P. Martin Sander,
Xiaohong Chen,
Long Cheng,
Xiaofeng Wang

Published: May 23, 2011
https://doi.org/10.1371/journal.pone.0019480

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Several specimens attributed to Shastasaurus by Sander et al. 2011 may not be monophyletic.

Posted by DavidPeters1247 on 15 Apr 2015 at 23:35 GMT

The Sander et al. phylogenetic analysis nested the three putative Shastasaurus specimens together despite their apparent differences. I tested these nestings with an independent list of 228 character traits and found the UCMP 9017 specimen (the holotype) nested with S. alexandrae in a very basal position basal to hupesuchids. The others nested elsewhere. The YGMR SPC V3108 specimen nested with Mikadocephalus. The YGMR SPC V3107 specimen nested with Cymbodpondylus and Shonisaurus (Shastasaurus) sikanniensis. The complete cladogram can be viewed here:
http://www.reptileevoluti...
and the .nex file can be requested at that url.

No competing interests declared.

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Short-Snouted Toothless Ichthyosaur from China Suggests Late Triassic Diversification of Suction Feeding Ichthyosaurs

Short-Snouted Toothless Ichthyosaur from China Suggests Late Triassic Diversification of Suction Feeding Ichthyosaurs

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Several specimens attributed to Shastasaurus by Sander et al. 2011 may not be monophyletic.

Posted by DavidPeters1247 on 15 Apr 2015 at 23:35 GMT