Buckman’s Rules of Covariation

  • Claude Monnet
  • Kenneth De Baets
  • Margaret M. Yacobucci
Chapter
Part of the Topics in Geobiology book series (TGBI, volume 44)

Abstract

Most planispirally and regularly coiled ammonoid species show to varying degrees continuous morphological intraspecific variation of their shell. In many species, individuals range from slender, involute, compressed, and weakly ornamented forms to “robust” forms, which are more evolute, more depressed, and with coarser ornamentation. Additionally, more compressed shells tend to have more complex sutures. Within a species from a single sample, the frequency of these variants is represented by a continuous unimodal distribution (often normal). These covariation patterns of intraspecific variation have been abundantly documented and were coined “Buckmans Laws of Covariation”. These rules help to delineate ammonoid morphospecies. This interdependent morphological variation suggests that shell morphogenesis may not be random but constrained either by adaptive constraints or simple constructional scaling rules. The cause(s) remain debated. Hence, although Buckman’s rules of covariation are now widely documented and acknowledged, several aspects of their scope and limits still remain to be investigated.

Keywords

Ammonoids Cephalopoda Intraspecific variation Morphological variability Shell morphogenesis Taxonomy 

Notes

Acknowledgments

We warmly thank Arnaud Brayard (Dijon), Hugo Bucher, Christian Klug, David Ware and Maximiliano Meier (all Zürich) for constructive discussion on ammonoid taxonomy and providing datasets. The referees Christian Klug (Zürich) and Jean Guex (Lausanne) are also thanked for their comments.

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Claude Monnet
    • 1
  • Kenneth De Baets
    • 2
  • Margaret M. Yacobucci
    • 3
  1. 1.UMR CNRS 8217 Géosystèmes, UFR des Sciences de la Terre (SN5)Université de Lille 1Villeneuve d’Ascq cedexFrance
  2. 2.GeoZentrum Nordbayern, Fachgruppe PaläoUmweltFriedrich-Alexander-Universität Erlangen-NürnbergErlangenGermany
  3. 3.Department of GeologyBowling Green State UniversityBowling GreenUSA

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