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Westermann Morphospace displays ammonoid shell shape and hypothetical paleoecology

Published online by Cambridge University Press:  08 February 2016

Kathleen A. Ritterbush  and
David J. Bottjer
Kathleen A. Ritterbush
Affiliation:
Earth Sciences Department, University of Southern California, 3651 Trousdale Parkway, ZHS 233, Los Angeles, California 90089, U.S.A. E-mail: ritterbu@usc.edu
David J. Bottjer
Affiliation:
Earth Sciences Department, University of Southern California, 3651 Trousdale Parkway, ZHS 233, Los Angeles, California 90089, U.S.A. E-mail: ritterbu@usc.edu
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Abstract

The Westermann Morphospace method displays fundamental morphotypes and hypothesized life modes of measured ammonoid fossils in a ternary diagram. It quantitatively describes shell shape, without assumption of theoretical coiling laws, in a single, easy-to-read diagram. This allows direct comparison between data sets presented in Westermann Morphospace, making it an ideal tool to communicate morphology. By linking measured shells to hypothesized life modes, the diagram estimates ecospace occupation of the water column. Application of this new method is demonstrated with Mesozoic data sets from monographs. Temporal variation, intraspecies variation, and ontogenetic variation are considered. This method can address hypothetical ecospace occupation in collections with tight stratigraphic, lithologic, and abundance control, even when taxonomy is in dispute.

Type
Articles
Information
Paleobiology , Volume 38 , Issue 3 , Summer 2012 , pp. 424 - 446
Copyright
Copyright © The Paleontological Society 

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References

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