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Paleontological Journal

, Volume 52, Issue 14, pp 1746–1755 | Cite as

Paleozoic Ammonoids: Historical Pathways of the Development of Morphological Diversity

  • T. B. LeonovaEmail author
Article

Abstract

The history of Paleozoic ammonoids can be subdivided into two large intervals: Devonian and Carboniferous–Permian. There were two major evolutionary pathways: changes in the external shell morphology and changes in the suture, a character observed only in cephalopods. Almost all major shell types and ornamentation appeared at early stages of the evolution of the subclass Ammonoidea (archaic diversity). The suture in ancient taxa in this group was represented by virtually all known types, except for the complexly dissected suture lines of the “Mesozoic type” that appeared only at the end of the Paleozoic. During the time of the subclass’s existence, Devonian morphotypes recurrently appeared in different orders. The senile diversity was associated with the diversification of exotic taxa at the end of the Ammonoidea evolution.

Keywords:

Ammonoidea Paleozoic shell morphology suture patterns 

Notes

ACKNOWLEDGMENTS

This work was supported by the Program of Fundamental Research no. 17 of the Presidium of the Russian Academy of Sciences “Evolution of the Organic World. Role and influence of planetary processes,” Subprogram 1 “Development of life and biosphere processes,” the project “Restructuring of the morphological and ecological structure of pelagic communities at the critical boundaries of the Phanerozoic.”

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Borissiak Paleontological Institute, Russian Academy of SciencesMoscowRussia

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