A Morpho-molecular Perspective on the ...
Document type :
Article dans une revue scientifique: Article original
Title :
A Morpho-molecular Perspective on the Diversity and Evolution of Spumellaria (Radiolaria)
Author(s) :
Sandin, Miguel [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Biard, Tristan [Auteur]
Université du Littoral Côte d'Opale [ULCO]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Romac, Sarah [Auteur]
Adaptation et diversité en milieu marin [ADMM]
O'Dogherty, Luis [Auteur]
Suzuki, Noritoshi [Auteur]
Not, Fabrice [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Adaptation et diversité en milieu marin [ADMM]
Biard, Tristan [Auteur]
Université du Littoral Côte d'Opale [ULCO]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Romac, Sarah [Auteur]
Adaptation et diversité en milieu marin [ADMM]
O'Dogherty, Luis [Auteur]
Suzuki, Noritoshi [Auteur]
Not, Fabrice [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Journal title :
Protist
Pages :
125806
Publisher :
Elsevier
Publication date :
2021-07
ISSN :
1434-4610
English keyword(s) :
Spumellaria
rDNA
molecular diversity
barcoding
molecular clock
molecular evolution
rDNA
molecular diversity
barcoding
molecular clock
molecular evolution
English abstract : [en]
pumellaria (Radiolaria, Rhizaria) are holoplanktonic amoeboid protists, ubiquitous and abundant in the global ocean. Their silicified skeleton preserves very well in sediments, displaying an excellent fossil record extremely ...
Show more >pumellaria (Radiolaria, Rhizaria) are holoplanktonic amoeboid protists, ubiquitous and abundant in the global ocean. Their silicified skeleton preserves very well in sediments, displaying an excellent fossil record extremely valuable for paleo-environmental reconstruction studies, from where most of their extant diversity and ecology have been inferred. This study represents a comprehensive classification of Spumellaria based on the combination of ribosomal taxonomic marker genes (rDNA) and morphological characteristics. In contrast to established taxonomic knowledge, we demonstrate that symmetry of the skeleton takes more importance than internal structures at high classification ranks. Such reconsideration allows gathering different morphologies with concentric structure and spherical or radial symmetry believed to belong to other Radiolaria orders from the fossil record, as for some Entactinaria families. Our calibrated molecular clock dates the origin of Spumellaria in the middle Cambrian (ca. 515 Ma), among the first radiolarian representatives in the fossil record. This study allows a direct connection between living specimens and extinct morphologies from the Cambrian, bringing both a standpoint for future molecular environmental surveys and a better understanding for paleo-environmental reconstruction analysis.Show less >
Show more >pumellaria (Radiolaria, Rhizaria) are holoplanktonic amoeboid protists, ubiquitous and abundant in the global ocean. Their silicified skeleton preserves very well in sediments, displaying an excellent fossil record extremely valuable for paleo-environmental reconstruction studies, from where most of their extant diversity and ecology have been inferred. This study represents a comprehensive classification of Spumellaria based on the combination of ribosomal taxonomic marker genes (rDNA) and morphological characteristics. In contrast to established taxonomic knowledge, we demonstrate that symmetry of the skeleton takes more importance than internal structures at high classification ranks. Such reconsideration allows gathering different morphologies with concentric structure and spherical or radial symmetry believed to belong to other Radiolaria orders from the fossil record, as for some Entactinaria families. Our calibrated molecular clock dates the origin of Spumellaria in the middle Cambrian (ca. 515 Ma), among the first radiolarian representatives in the fossil record. This study allows a direct connection between living specimens and extinct morphologies from the Cambrian, bringing both a standpoint for future molecular environmental surveys and a better understanding for paleo-environmental reconstruction analysis.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
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