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The Sweetognathus complex in the Permian of China: implications for evolution and homeomorphy

Published online by Cambridge University Press:  14 July 2015

Wang Cheng-Yuan ,
Scott M. Ritter  and
David L. Clark
Wang Cheng-Yuan
Affiliation:
Nanjing Institute of Geology and Paleontology, Academia Sinica, Nanjing
Scott M. Ritter
Affiliation:
Department of Geology, Oklahoma State University, Stillwater 74074
David L. Clark
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, Madison 53706
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Abstract

The well-exposed and fossiliferous Permian carbonates in China have yielded Early and Late Permian species of the Sweetognathus complex that permit worldwide stratigraphic evaluation of members of the group. The sporadic appearance of species of Sweetognathus and related genera throughout the Permian in western North America and Iran, in particular, may represent iterative evolution and homeomorphy. The pectiniform element morphologies of the several species are interpreted as most important for evolutionary studies and document a partial Permian biostratigraphy in China that aids in the interpretation of less complete sequences elsewhere. A new genus, Pseudosweetognathus, and four new species, Pseudosweetognathus costatus, Sweetognathus subsymmetricus, S. paraguizhouensis, and Iranognathus nudus, are described.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue 5 , September 1987 , pp. 1047 - 1057
Copyright
Copyright © The Paleontological Society 

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