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3D models related to the publication: Patterns of
bilateral asymmetry and allometry in Late Devonian
Polygnathus conodonts
Catherine Girard, Anne-lise Charruault, Ronan Ledevin, Sabrina Renaud
To cite this version:
Catherine Girard, Anne-lise Charruault, Ronan Ledevin, Sabrina Renaud. 3D models related to the
publication: Patterns of bilateral asymmetry and allometry in Late Devonian Polygnathus conodonts.
MorphoMuseum, Association Palæovertebrata, 2021, 7 (2), �10.18563/journal.m3.126�. �hal-03283620�
Dataset
3D models related to the publication: Patterns of bilateral
asymmetry and allometry in Late Devonian Polygnathus conodonts
Catherine Girard
1
*, Anne-Lise Charruault
1
, Ronan Ledevin
2,3
, Sabrina Renaud
2
1
Institut des Sciences de l’Evolution de Montpellier (ISEM), Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
2
Laboratoire de Biom
´
etrie et Biologie Evolutive, UMR 5558 CNRS, Universit
´
e Claude Bernard Lyon 1, Universit
´
e de Lyon, 69100 Villeurbanne, France
3
Current address: UMR5199 PACEA, Universit
´
e de Bordeaux, All
´
ee Geoffroy Saint Hilaire (Bat. B8), 33615 PESSAC, France
*Corresponding author: catherine.girard@umontpellier.fr
Abstract
This contribution contains the 3D models of the set of Famennian conodont elements belonging to the species
Polygnathus glaber and Polygnathus communis analyzed in the following publication: Renaud et al. 2021: Patterns
of bilateral asymmetry and allometry in Late Devonian Polygnathus. Palaeontology, https://doi.org/10.1111/pala.12513.
Keywords: Conodonts, Late Devonian, Polygnathus communis, Polygnathus glaber
Submitted:2020-08-11, published online:2021-03-03. https://doi.org/10.18563/journal.m3.126
Inv. Nr Taxon Description
UM BUS 001 Polygnathus glaber right P1 element
UM BUS 002 Polygnathus glaber right P1 element
UM BUS 003 Polygnathus glaber right P1 element
UM BUS 004 Polygnathus glaber left P1 element
UM BUS 005 Polygnathus glaber left P1 element
UM BUS 006 Polygnathus glaber right P1 element
UM BUS 007 Polygnathus glaber right P1 element
UM BUS 008 Polygnathus glaber left P1 element
UM BUS 009 Polygnathus glaber left P1 element
UM BUS 010 Polygnathus glaber right P1 element
UM BUS 011 Polygnathus glaber right P1 element
UM BUS 012 Polygnathus glaber right P1 element
UM BUS 013 Polygnathus glaber left P1 element
UM BUS 014 Polygnathus glaber left P1 element
UM BUS 015 Polygnathus glaber left P1 element
UM BUS 016 Polygnathus glaber right P1 element
UM BUS 017 Polygnathus glaber left P1 element
UM BUS 018 Polygnathus glaber left P1 element
UM BUS 019 Polygnathus glaber left P1 element
UM BUS 020 Polygnathus glaber left P1 element
UM BUS 021 Polygnathus glaber right P1 element
UM BUS 022 Polygnathus glaber left P1 element
UM BUS 023 Polygnathus glaber left P1 element
UM BUS 024 Polygnathus glaber left P1 element
UM BUS 025 Polygnathus glaber left P1 element
UM BUS 026 Polygnathus glaber left P1 element
UM BUS 027 Polygnathus glaber right P1 element
UM BUS 028 Polygnathus glaber right P1 element
UM BUS 029 Polygnathus glaber right P1 element
UM BUS 030 Polygnathus glaber right P1 element
UM CTB 001 Polygnathus communis right P1 element
UM CTB 002 Polygnathus communis right P1 element
UM CTB 003 Polygnathus communis right P1 element
UM CTB 004 Polygnathus communis right P1 element
UM CTB 005 Polygnathus communis left P1 element
UM CTB 006 Polygnathus communis left P1 element
UM CTB 007 Polygnathus communis left P1 element
UM CTB 008 Polygnathus communis left P1 element
UM CTB 009 Polygnathus communis right P1 element
UM CTB 010 Polygnathus communis left P1 element
UM CTB 011 Polygnathus communis right P1 element
UM CTB 012 Polygnathus communis right P1 element
UM CTB 013 Polygnathus communis right P1 element
UM CTB 014 Polygnathus communis right P1 element
UM CTB 015 Polygnathus communis right P1 element
UM CTB 016 Polygnathus communis left P1 element
UM CTB 017 Polygnathus communis right P1 element
UM CTB 018 Polygnathus communis right P1 element
UM CTB 019 Polygnathus communis right P1 element
UM CTB 020 Polygnathus communis right P1 element
UM CTB 021 Polygnathus communis left P1 element
UM CTB 022 Polygnathus communis left element
UM CTB 023 Polygnathus communis left P1 element
UM CTB 024 Polygnathus communis left P1 element
UM CTB 025 Polygnathus communis left P1 element
UM CTB 026 Polygnathus communis left P1 element
UM CTB 027 Polygnathus communis left P1 element
UM CTB 028 Polygnathus communis left P1 element
UM CTB 029 Polygnathus communis left P1 element
UM CTB 030 Polygnathus communis left P1 element
UM CTB 031 Polygnathus communis left P1 element
UM CTB 032 Polygnathus communis left P1 element
UM CTB 033 Polygnathus communis left P1 element
UM CTB 034 Polygnathus communis right P1 element
Table 1.
3D models of Polygnathus glaber and of Polygnathus com-
munis. Collection: University of Montpellier, France.
INTRODUCTION
This contribution presents 3D models of 64 Famennien (Late
Devonian) conodont elements belonging to two Polygnathus
species (see Table 1 and Fig. 1). All elements correspond
3D models of Late Devonian Polygnathus — 2/3
to platform (P1) elements, located at the rear of the conodont
feeding apparatus. Polygnathus communis was sampled by 34
elements from two levels of the Col des Tribes section (CTB;
Montagne Noire, France) (Girard et al. 2014) and Polygnathus
glaber by 30 elements from one level of the Buschteich section
(BUS; Saxo-Thuringia, Germany) (Girard et al. 2017). They
illustrate the morphological variation between and within the
species, including bilateral asymmetry and growth.
The 3D surface of these elements were used in a geometric
morphometric analysis complementing an extensive 2D quan-
titative study (Renaud et al. 2021). Based on a set of sliding
semi-landmarks located at the edge of the platform and on the ca-
rina, this study aimed at disentangling the different components
of the morphological variation in Late Devonian Polygnathus P1
elements. The 3D morphometric analysis improved the descrip-
tion of the geometric changes involved in growth and bilateral
asymmetry and provided evidence that the balance between the
two components of shape variance varies across species. Allom-
etry was most pronounced in Polygnathus communis, leading
from small, heart-shaped to large, lanceolate platforms. In con-
trast, bilateral asymmetry was most pronounced in Po. glaber,
suggestive in this species of a strict directional asymmetry. On
the mean shape of left elements, the posterior margin extended
more ventrally, the posterior platform was more elevated and
displayed a shallower groove, as confirmed by the example of
actual elements (Fig. 1). The reverse is true for the right ele-
ment, with, however, less offset between the ventral extension
of the posterior and anterior margins. Knowing that the left
blade is assumed to insert behind the right one, based on ex-
isting clusters (Donoghue and Purnell 1999; Mart
´
ınez-P
´
erez
et al. 2016), the geometric differences between right and left
elements, evidenced on the 3D models, could be associated with
the asymmetrical pairing of the elements during occlusion.
METHODS
Digitization of the specimens was performed using an X-ray mi-
crotomograph (
µ
CT) Phoenix nanotomeS on the AniRA-Immos
platform of the SFR Biosciences (UMS 3444, ENS Lyon) at
a cubic voxel resolution of 1
µ
m. The scanning parameters
were as follow: 100 kV, 70
µ
A, 3000 projections at 360
°
with
no filter. The 3D surfaces were extracted semi-automatically
within AVIZO 9 (Thermofisher Scientific) using the segmenta-
tion threshold selection tool. The 3D surfaces are provided in
.ply format, and can therefore be opened with a wide range of
freeware.
ACKNOWLEDGEMENTS
We acknowledge the contribution of SFR Biosciences (UMS3444/
CNRS, US8/Inserm, ENS de Lyon, UCBL) AniRa-ImmOs fa-
cility. We particularly thank Mathilde Bouchet for her kind
assistance during the scanning sessions. The research was sup-
ported by the ANR ECODEV (ANR-13-BSV7-005) and the
Project Marcon (Labex CeMEB). This is contribution ISEM
2020-226.
BIBLIOGRAPHY
Donoghue, P. C., Purnell, M. A. 1999. Mammal-like occlusion
in conodonts. Paleobiology 25(1), 58-74.
Girard, C., Corn
´
ee, J.-J., Charruault, A.-L., Corradini, C., Weyer,
D., Bartzsch, K., Joachimski, M. M., Feist, R. 2017. Con-
odont biostratigraphy and palaeoenvironmental trends during
the Famennian (Late Devonian) in the Thuringian Buschteich
section (Germany). Newsletters on Stratigraphy 50(1), 71-89.
https://doi.org/10.1127/nos/2016/0318
Girard, C., Corn
´
ee, J.-J., Corradini, C., Fravalo, A., Feist, R.
2014. Palaeoenvironmental changes at Col des Tribes (Mon-
tagne Noire, France), a reference section for the Famennian
of north Gondwana-related areas. Geological Magazine 151,
864-884. https://doi.org/10.1017/S0016756813000927
Mart
´
ınez-P
´
erez, C., Rayfield, E. J., Botella, H., Donoghue, P.
C. 2016. Translating taxonomy into the evolution of conodont
feeding ecology. Geology 44, 247-250. https://doi.org/10.11
30/G37547.1
Renaud, S., Ecalle, B., Claisse, P., Charruault, A.-L., Ledevin,
R., Girard, C. 2021. Patterns of bilateral asymmetry and allom-
etry in Late Devonian Polygnathus conodonts. Palaeontology.
https://doi.org/10.1111/pala.12513
M3 Journal 6:e126 ISSN: 2274-0422
3D models of Late Devonian Polygnathus — 3/3
Figure 1.
Illustrations based on isolated right and left elements of Po. glaber (A), large Po. communis (B) and small Po. communis (C). (A, B, C)
left element to the left and right element to the right. Top panels, oral view; bottom panels, profile view. The position of the slice corresponding to
the profile view is marked by a line on the oral view. Elements not to scale. Specimens figured: (A) Po. glaber right (UM BUS 027) and left (UM
BUS 026); (B) large Po. communis left (UM CTB 010) and right (UM CTB 009); (C) small Po. communis left (UM CTB 006) and right (UM
CTB 003).
M3 Journal 6:e126 ISSN: 2274-0422
