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Exploration of the Oxynoticeratidae ornamental morphospace using the discrete cosine transform (DCT) to analyze rib patterns

Published online by Cambridge University Press:  08 April 2016

Jean-Louis Dommergues ,
Cyril H. Dommergues  and
Christian Meister
Jean-Louis Dommergues
Affiliation:
Biogéosciences (UMR CNRS 5561), Centre des Sciences de la Terre, Université de Bourgogne, boulevard Gabriel 6, F-21000 Dijon, France. E-mail: [email protected]
Cyril H. Dommergues
Affiliation:
Biogéosciences (UMR CNRS 5561), Centre des Sciences de la Terre, Université de Bourgogne, boulevard Gabriel 6, F-21000 Dijon, France. E-mail: [email protected]
Christian Meister
Affiliation:
Muséum d'histoire naturelle de Genève, Département de Géologie et de Paléontologie, route de Malagnou 1, CH-1211 Geneva, Switzerland. E-mail: [email protected]
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Abstract

The discrete cosine transform (DCT) is a Fourier-related transform widely used in signal processing and well suited to analyzing open outlines such as ammonite ribs. The method is applied here to depict and decipher the ribbing morphospace of a large group of Lower Jurassic ammonites composed of the Oxynoticeratidae and their close ancestors. Because they are clearly associated with buoyancy and/or swimming ability, the usually clearly involute, comparatively smooth and compressed shells of these ammonites may well be misleading taxonomic markers. In this context, quantitative analysis of the ribbing pattern using the DCT may significantly improve our perception of the ornamental patterns expressed within the group. A set of 251 specimens illustrating the worldwide fauna and selected from more than 80 publications is analyzed. Big differences are found in the evolutionary patterns of the two main lineages of Oxynoticeratidae currently accepted in the literature. A previously unsuspected Mediterranean group comprising principally the genus Parasteroceras is identified from its distinctive ornamentation. The northwest European and Mediterranean genera Eparietites, Oxynoticeras, and Parasteroceras do not feature among the American (East Pacific) faunas. This finding calls into question some generally accepted correlations between European and American stratigraphic frameworks. The study shows that the DCT is a valuable tool for discriminating between species within the huge and often puzzling range of ornamental variation of the main genera (e.g., Gleviceras and Radstockiceras).

Type
Articles
Information
Paleobiology , Volume 32 , Issue 4 , Fall 2006 , pp. 628 - 651
Copyright
Copyright © The Paleontological Society 

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