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Article: Revision of the genus Anasibirites Mojsisovics (Ammonoidea): an iconic and cosmopolitan taxon of the late Smithian (Early Triassic) extinction

Papers in Palaeontology - Cover Image - Volume 2 Part 1
Publication: Palaeontology
Volume: 2
Part: 1
Publication Date: Febuary 2016
Page(s): 155 188
Author(s): Romain Jattiot, Hugo Bucher, Arnaud Brayard, Claude Monnet, James F. Jenks, and Michael Hautmann
DOI: 10.1002/spp2.1036
Addition Information

How to Cite

JATTIOT, R., BUCHER, H., BRAYARD, A., MONNET, C., JENKS, J.F., HAUTMANN, M. 2016. Revision of the genus Anasibirites Mojsisovics (Ammonoidea): an iconic and cosmopolitan taxon of the late Smithian (Early Triassic) extinction. Papers in Palaeontology, 2, 1, 155-188. DOI: 10.1002/spp2.1036

Author Information

  • Romain Jattiot - Paläontologisches Institut der Universität Zürich Zürich Switzerland (Email: romain.jattiot@pim.uzh.ch)
  • Romain Jattiot - Université de Bourgogne Franche‐Comté UMR CNRS 6282 Biogéosciences Dijon France
  • Hugo Bucher - Paläontologisches Institut der Universität Zürich Zürich Switzerland
  • Arnaud Brayard - Université de Bourgogne Franche‐Comté UMR CNRS 6282 Biogéosciences Dijon France
  • Claude Monnet - UFR Sciences de la Terre (SN5), Cité Scientifique UMR CNRS 8198 Evo‐Eco‐Paleo, Université de Lille (Sciences et Technologies) Villeneuve d'Ascq France
  • James F. Jenks - West Jordan Utah USA
  • Michael Hautmann - Paläontologisches Institut der Universität Zürich Zürich Switzerland

Publication History

  • Issue published online: 13 February 2016
  • Article first published online: 01 January 1970
  • Manuscript Accepted: 08 October 2015
  • Manuscript Received: 29 July 2015

Funded By

Swiss NSF project. Grant Number: 200020‐160055
French ANR‐13‐JS06‐0001‐01 project
University of Zürich

Online Version Hosted By

Wiley Online Library
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Abstract

The family Prionitidae Hyatt represents a major component of ammonoid faunas during the Smithian (Early Triassic), and the genus Anasibirites Mojsisovics is the most emblematic taxon of this family. Its stratigraphical range is restricted to the beginning of the late Smithian (Wasatchites distractus Zone). The genus is also characterized by an unusual cosmopolitan distribution, thus contrasting with most earlier Smithian ammonoid distributions that were typically restricted by latitude. Because the late Smithian witnessed an extinction of the nekton (e.g. ammonoids, conodonts) whose amplitude is equal to or larger than that of the end‐Permian crisis, the number of valid species that should be included in the genus Anasibirites becomes a highly relevant question when addressing this extinction at the highest possible taxonomic resolution. Based on a new extensive collection from Timor, the composition of the genus Anasibirites is herein revised with respect to its intraspecific and ontogenetic variations. Comprehensive morphological and biometric studies (c. 950 measured specimens) indicate that, of the c. 60 available species names, only two are valid, namely Akingianus (Waagen) and Amultiformis Welter. Continuous ranges of intraspecific variation enable us to synonymize A. nevolini Zakharov, 1968 and A. angulosus (Waagen) with A. kingianus. The contribution of Anasibirites to species diversity during the late Smithian extinction is thus significantly less than previously estimated, therefore accentuating the severity of this event.

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