Titre :

Morphological disparity of early ammonoids: A geometric morphometric approach to investigate conch geometry

Auteur(s) :

Allaire, Ninon [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Ginot, Samuel [Auteur]
Institut des Sciences de l'Evolution de Montpellier [UMR ISEM]
Institut de Génomique Fonctionnelle de Lyon [IGFL]
de Baets, Kenneth [Auteur]
Uniwersytet Warszawski [Polska] = University of Warsaw [Poland] = Université de Varsovie [Pologne] [UW]
Korn, Dieter [Auteur]
Nanjing Institute of Geology and Palaeontology [NIGPAS-CAS]
Museum für Naturkunde [Berlin]
Goudemand, Nicolas [Auteur]
Institut de Génomique Fonctionnelle de Lyon [IGFL]
Monnet, Claude [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Crônier, Catherine [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]

Titre de la revue :

Acta Palaeontologica Polonica

Pagination :

193-212

Éditeur :

Polskiej Akademii Nauk, Instytut Paleobiologii

Date de publication :

2023-06-28

ISSN :

0567-7920

Mot(s)-clé(s) en anglais :

Ammonoidea
conch geometry
geometric morphometrics
macroevolution
morphological disparity
Devonian

Discipline(s) HAL :

Planète et Univers [physics]/Sciences de la Terre/Paléontologie

Résumé en anglais : [en]

Fossils of Devonian ammonoids are abundant and well-preserved in the Anti-Atlas of Morocco; as such they provide an invaluable record of regional morphological disparity changes (diversity of shapes) that characterise the ...
Lire la suite >Fossils of Devonian ammonoids are abundant and well-preserved in the Anti-Atlas of Morocco; as such they provide an invaluable record of regional morphological disparity changes (diversity of shapes) that characterise the first steps of ammonoid evolution. However, they were rarely analysed quantitatively with respect to their morphological spectrum. Here, we investigated the morphological disparity of the Early–Middle Devonian ammonoids of the Moroccan Anti-Atlas by analysing the shape of their whorl profile. A geometric morphometric approach based on the acquisition of outline semilandmark coordinates was used to analyse the whorl profiles. For comparison, morphometric ratios based on classical conch measurements were also analysed to investigate the overall conch geometry. Several standard disparity estimators were computed to measure different aspects of morphological disparity fluctuations through time. It appears that a major increase in disparity occurred throughout the Early Devonian, followed by fluctuating disparity during the Middle Devonian constituting a general decreasing trend. Only the end-Eifelian Kačák Event shows a significant decrease in disparity. Thus, the ammonoids explored the range of possible shapes fairly quickly during their initial radiation; however, we found no evidence for an early burst of shape diversity (i.e., the rise does not exceed the expectations given diversity). Nevertheless, correlation tests between diversity and disparity time series support that they are partiallydecoupled. The highly resolved biozone record highlights that the increase in disparity began earlier than the increase in diversity that characterises the late Emsian.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

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

Source :

Harvested from HAL