Mode and Rate of Growth in Ammonoids

  • Hugo Bucher
  • Neil H. Landman
  • Susan M. Klofak
  • Jean Guex
Part of the Topics in Geobiology book series (TGBI, volume 13)


In this chapter we discuss the mode and rate of growth in ammonoids, focusing primarily on postembryonic growth. We first discuss the general mode of growth and then describe the ontogenetic sequence of growth stages. These stages are recognized on the basis of changes in morphology. For example, a gràph of the increase in size of whorl width versus shell diameter in an individual reveals changes through ontogeny that pinpoint the end of one growth stage and the beginning of another. We next discuss the overall rate of growth through ontogeny and establish a generalized growth curve. In this discussion, we refer to other cephalopods whose rate of growth is known. Fluctuations in the rate of growth that are superimposed on this growth curve are indicated in ammonoids by the presence of such shell features as varices and constrictions.


Middle Jurassic Middle Triassic Early Jurassic Growth Line Soft Body 
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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Hugo Bucher
    • 1
  • Neil H. Landman
    • 2
    • 3
  • Susan M. Klofak
    • 2
    • 3
  • Jean Guex
    • 4
  1. 1.URA CNRS 157, Centre des Sciences de la TerreUniversité de BourgogneDijonFrance
  2. 2.Department of InvertebratesAmerican Museum of Natural HistoryNew YorkUSA
  3. 3.Department of BiologyCUNYNew YorkUSA
  4. 4.Institut de GéologieUniversité de Lausanne, BFSH-2LausanneSwitzerland

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