Titre :

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

Auteur(s) :

Jattiot, Romain [Auteur]
Biogéosciences [UMR 6282] [BGS]
Bucher, Hugo [Auteur]
Brayard, Arnaud [Auteur]
Biogéosciences [UMR 6282] [BGS]
Monnet, Claude [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Jenks, James F. [Auteur]
Hautmann, Michael [Auteur]

Titre de la revue :

Papers in Palaeontology

Pagination :

155-188

Éditeur :

Wiley

Date de publication :

2016

ISSN :

2056-2799

Mot(s)-clé(s) en anglais :

late Smithian extinction
Timor
Anasibirites
Taxonomy
intraspecific variation

Discipline(s) HAL :

Planète et Univers [physics]/Sciences de la Terre/Paléontologie
Sciences du Vivant [q-bio]/Biologie animale/Zoologie des invertébrés
Sciences du Vivant [q-bio]/Biodiversité/Systématique, phylogénie et taxonomie

Résumé en anglais : [en]

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 ...
Lire la suite >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 A. kingianus (Waagen) and A. multiformis 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.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Commentaire :

34 pages

Collections :

• Évolution, Écologie et Paléontologie (Evo Eco Paleo) - UMR 8198

Source :

Harvested from HAL