Fossil Record 21(2): 223-236, doi: 10.5194/fr-21-223-2018
Quantitative analysis of suture lines in Carboniferous ammonoids
expand article infoMichael Wegerer‡, Kenneth De Baets§, D. Korn|
‡ Museum für Naturkunde Berlin, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany§ Geozentrum Nordbayern, Friedrich-Alexander Universität Erlangen-Nürnberg, 91054 Erlangen, Germany| Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany
© Michael Wegerer, Kenneth De Baets, D. Korn.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Wegerer M, De Baets K, Korn D (2018) Quantitative analysis of suture lines in Carboniferous ammonoids. Fossil Record 21(2): 223-236. https://doi.org/10.5194/fr-21-223-2018
Open Access
Abstract

Two morphometricmethods are applied and compared for the analysis of suture lines in EarlyCarboniferous ammonoids of the superfamilies Pericycloidea, Girtyoceratoideaand Goniatitoidea. We analysed (1) classic metric data (proportions of thewidth and depths or heights of lobes and saddles) using multivariatestatistic methods and (2) outline data of the external lobe and theventrolateral saddle of the same ammonoid taxa using the elliptic Fourieranalysis. Both methods lead to similar results and simultaneously demonstrateontogenetic and phylogenetic trends of these ammonoids. Our results areconsistent with three previously suggested evolutionary patterns: (1) ageneral decrease of the amplitude of lobes and saddles, (2) a proportionalwidening of the external lobe and (3) a heightening of the median saddle.