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Mature Modifications and Sexual Dimorphism

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Ammonoid Paleobiology: From anatomy to ecology

Part of the book series: Topics in Geobiology ((TGBI,volume 43))

Abstract

Most ammonoids display a distinctly different morphology when they are adults or subadults. Depending on the taxon, these mature modifications may comprise changes in coiling, changes in ornamentation, and conspicuous changes of the terminal aperture. These mature modifications permit, at least when a combination of which occurs, to identify adult specimens. Co-occurrence of adult forms with differences in size, ornament strength, and aperture shape led already half a century ago to the conclusion that many ammonoids display dimorphism. The smaller forms are usually dubbed microconchs and the larger ones macroconchs. The degrees of differences between the antidimorphs vary and are more or less characteristic for certain clades. Such dimorphism is also known from Recent cephalopods. According to actualistic comparisons and considerations concerning reproductive biology of Recent cephalopods, it is commonly assumed that the microconchs represented the males and macroconchs the females. This hypothesis still needs verification from soft-tissue preservation.

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Acknowledgments

Some of the insights in this chapter grew in the course of research projects with the numbers 200021-113956/1, 200020-25029, and 200020-132870 funded by the Swiss National Science Foundation SNF. Images were kindly provided by Neil Landman (New York, USA), Günter Schweigert and Gerd Dietl (both Stuttgart, Germany), Jean-Stéphane David (Saint Dolay, France), Victor Schlamp (Lappersdorf, Germany), Christian Obrist (Rickenbach, Switzerland), Didier Bert (La Mure-Argens, France), Patrick Branger (Poitiers cedex, France), Wolfgang Grulke (Oborne, UK), Andreas E. Richter (Augsburg, Germany), Pierre-Yves Boursicot (Hauts-de-Seine, France). Margaret Yacobucci (Bowling Green), Izabela Ploch (Warsaw), and Kristin Polizzotto (Brooklyn) reviewed the manuscript and provided valuable constructive suggestions to improve it.

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Authors and Affiliations

  1. Paläontologisches Institut und Museum, University of Zurich, Karl Schmid-Strasse 6, 8006, Zurich, Switzerland

    Christian Klug & Amane Tajika

  2. Faculty of Earth Sciences, University of Silesia, Bedzinska 60, 41-200, Sosnowiec, Poland

    Michał Zatoń

  3. Laboratorio de Paleontología, IFG-FCEIA, Universidad Nacional de Rosario, Pellegrini 250, 2000, Rosario, Argentina

    Horacio Parent

  4. Naturhistorisches Museum, Bernastrasse 15, 3005, Bern, Switzerland

    Bernhard Hostettler

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  1. Christian Klug
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  2. Michał Zatoń
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  3. Horacio Parent
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  4. Bernhard Hostettler
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  5. Amane Tajika
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Correspondence to Christian Klug .

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Editors and Affiliations

  1. Paläontologisches Institut und Museum, University of Zurich, Zürich, Switzerland

    Christian Klug

  2. Leibniz-Institut für Evolutions und Biodiversitätsforschung, Museum für Naturkunde, Berlin, Germany

    Dieter Korn

  3. GeoZentrum Nordbayern, Friedrich-Alexander-Universität Erlangen, Erlangen, Germany

    Kenneth De Baets

  4. Division of Paleontology, American Museum of Natural History, New York, New York, USA

    Isabelle Kruta

  5. North Carolina Museum of Natural Science, Raleigh, USA

    Royal H. Mapes

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Klug, C., Zatoń, M., Parent, H., Hostettler, B., Tajika, A. (2015). Mature Modifications and Sexual Dimorphism. In: Klug, C., Korn, D., De Baets, K., Kruta, I., Mapes, R. (eds) Ammonoid Paleobiology: From anatomy to ecology. Topics in Geobiology, vol 43. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9630-9_7

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