Project 4048: P. Guenser, L. Souquet, S. Dolédec, M. Mazza, M. Rigo, N. Goudemand. 2019. Deciphering the roles of environment and development in the evolution of a Late Triassic assemblage of conodont elements. Paleobiology. 45 (3):1-18.
Specimen: † Metapolygnathus communisti Hayashi, 1968 (/2074:NA37_29)
View: 3D scan of P1 element

Abstract

To assess evolutionary processes in deep time, it is essential to understand the roles of development and environment, both recorded through the morphological variability of fossil assemblages. Thanks to their great abundance and the high temporal resolution of their fossil record, conodont elements are ideal to address this issue. In this paper, we present the first quantitative study of a Carnian–Norian (Late Triassic) assemblage of closely related P1 conodont elements. Using geometric morphometrics (landmarks, sliding landmarks, and elliptic Fourier analysis), we explore the main axes of phenotypic variation and relate them to classically used taxonomic characters. We show that some important taxonomic features follow laws of covariation, hence highlighting developmental constraints. Furthermore, the intraspecific variation within all considered species, either Carnian or Norian forms, is similarly restricted, emphasizing, for the first time in conodont P1 elements, a common line of least resistance to evolution, which means that similar intrinsic (developmental) factors were acting on these taxa and likely biased the evolutionary trajectories of all these taxa in a similar way. Because the evolution between Carnian and Norian forms is known to have followed a trajectory that is significantly different from the line of least resistance, strong extrinsic pressures, such as environmental disturbances, were probably at play around the Carnian/Norian boundary to counteract the effects of these intrinsic, developmental constraints.


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Article DOI: 10.1017/pab.2019.14

Project DOI: 10.7934/P4048, http://dx.doi.org/10.7934/P4048
This project contains
  • 689 Media
  • 1 Document
  • 7 Taxa
  • 184 Specimens
Total size of project's media files: 1.94G

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    Authors' Institutions

    • Université de Lyon (University of Lyon)

    • University of Modena and Reggio Emilia

    • University of Padova

    • Institute of Geosciences and Earth Resources, National Research Council of Italy (IGG-CNR)



    Members

    member name taxa specimens media
    Pauline Guenser
    Project Administrator
    6157686
    James Crampton
    Observer
    000
    Emilia Jarochowska
    Full membership
    1273
    Valentin Kelz
    Full membership
    000
    Michele Mazza
    Full membership
    000
    Manuel Rigo
    Full membership
    000


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    Document downloads1Information about the Carnian-Norian conodont P1 elements from the Pizzo Mondello (1 download);
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