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Development and growth of the pectoral girdle and fin skeleton in the extant coelacanth Latimeria chalumnae.
J Anat 2019JA

Abstract

The monobasal pectoral fins of living coelacanths and lungfishes are homologous to the forelimbs of tetrapods and are thus critical to investigate the origin thereof. However, it remains unclear whether the similarity in the asymmetrical endoskeletal arrangement of the pectoral fins of coelacanths reflects the evolution of the pectoral appendages in sarcopterygians. Here, we describe for the first time the development of the pectoral fin and shoulder girdle in the extant coelacanth Latimeria chalumnae, based on the tomographic acquisition of a growth series. The pectoral girdle and pectoral fin endoskeleton are formed early in development with a radially outward growth of the endoskeletal elements. The visualization of the pectoral girdle during development shows a reorientation of the girdle between the fetus and pup 1 stages, creating a contact between the scapulocoracoids and the clavicles in the ventro-medial region. Moreover, we observed a splitting of the pre- and post-axial cartilaginous plates in respectively pre-axial radials and accessory elements on one hand, and in post-axial accessory elements on the other hand. However, the mechanisms involved in the splitting of the cartilaginous plates appear different from those involved in the formation of radials in actinopterygians. Our results show a proportional reduction of the proximal pre-axial radial of the fin, rendering the external morphology of the fin more lobe-shaped, and a spatial reorganization of elements resulting from the fragmentation of the two cartilaginous plates. Latimeria development hence supports previous interpretations of the asymmetrical pectoral fin skeleton as being plesiomorphic for coelacanths and sarcopterygians.

Authors+Show Affiliations

UMR 7207 Centre de Recherche en Paléontologie, Paris, MNHN - Sorbonne Université - CNRS, Département Origines & Evolution, Muséum national d'Histoire naturelle, Paris, France. UMR 7179 MECADEV, MNHN - CNRS, Département Adaptations du Vivant, Muséum National d'Histoire Naturelle, Paris, France.UMR 7207 Centre de Recherche en Paléontologie, Paris, MNHN - Sorbonne Université - CNRS, Département Origines & Evolution, Muséum national d'Histoire naturelle, Paris, France.UMR 7179 MECADEV, MNHN - CNRS, Département Adaptations du Vivant, Muséum National d'Histoire Naturelle, Paris, France.School of Earth Sciences, University of Bristol, Bristol, UK.European Synchrotron Radiation Facility, Grenoble Cedex, France.Inserm U 1127, CNRS UMR 7225, Centre for NeuroImaging Research, ICM (Brain & Spine Institute), Sorbonne University, Paris, France.UMR 7179 MECADEV, MNHN - CNRS, Département Adaptations du Vivant, Muséum National d'Histoire Naturelle, Paris, France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31713843

Citation

Mansuit, Rohan, et al. "Development and Growth of the Pectoral Girdle and Fin Skeleton in the Extant Coelacanth Latimeria Chalumnae." Journal of Anatomy, 2019.
Mansuit R, Clément G, Herrel A, et al. Development and growth of the pectoral girdle and fin skeleton in the extant coelacanth Latimeria chalumnae. J Anat. 2019.
Mansuit, R., Clément, G., Herrel, A., Dutel, H., Tafforeau, P., Santin, M. D., & Herbin, M. (2019). Development and growth of the pectoral girdle and fin skeleton in the extant coelacanth Latimeria chalumnae. Journal of Anatomy, doi:10.1111/joa.13115.
Mansuit R, et al. Development and Growth of the Pectoral Girdle and Fin Skeleton in the Extant Coelacanth Latimeria Chalumnae. J Anat. 2019 Nov 12; PubMed PMID: 31713843.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Development and growth of the pectoral girdle and fin skeleton in the extant coelacanth Latimeria chalumnae. AU - Mansuit,Rohan, AU - Clément,Gaël, AU - Herrel,Anthony, AU - Dutel,Hugo, AU - Tafforeau,Paul, AU - Santin,Mathieu D, AU - Herbin,Marc, Y1 - 2019/11/12/ PY - 2019/10/10/accepted PY - 2019/11/13/entrez KW - Actinistia KW - endoskeleton KW - fin KW - ontogeny KW - pectoral girdle KW - sarcopterygian KW - tomography JF - Journal of anatomy JO - J. Anat. N2 - The monobasal pectoral fins of living coelacanths and lungfishes are homologous to the forelimbs of tetrapods and are thus critical to investigate the origin thereof. However, it remains unclear whether the similarity in the asymmetrical endoskeletal arrangement of the pectoral fins of coelacanths reflects the evolution of the pectoral appendages in sarcopterygians. Here, we describe for the first time the development of the pectoral fin and shoulder girdle in the extant coelacanth Latimeria chalumnae, based on the tomographic acquisition of a growth series. The pectoral girdle and pectoral fin endoskeleton are formed early in development with a radially outward growth of the endoskeletal elements. The visualization of the pectoral girdle during development shows a reorientation of the girdle between the fetus and pup 1 stages, creating a contact between the scapulocoracoids and the clavicles in the ventro-medial region. Moreover, we observed a splitting of the pre- and post-axial cartilaginous plates in respectively pre-axial radials and accessory elements on one hand, and in post-axial accessory elements on the other hand. However, the mechanisms involved in the splitting of the cartilaginous plates appear different from those involved in the formation of radials in actinopterygians. Our results show a proportional reduction of the proximal pre-axial radial of the fin, rendering the external morphology of the fin more lobe-shaped, and a spatial reorganization of elements resulting from the fragmentation of the two cartilaginous plates. Latimeria development hence supports previous interpretations of the asymmetrical pectoral fin skeleton as being plesiomorphic for coelacanths and sarcopterygians. SN - 1469-7580 UR - https://www.unboundmedicine.com/medline/citation/31713843/Development_and_growth_of_the_pectoral_girdle_and_fin_skeleton_in_the_extant_coelacanth_Latimeria_chalumnae L2 - https://doi.org/10.1111/joa.13115 DB - PRIME DP - Unbound Medicine ER -