Biotic crises and stages of radiolarian evolution in the Phanerozoic

Afanasieva, M. S.; Amon, E. O.

doi:10.1134/s0031030106100054

Cited by 13 publications

(3 citation statements)

References 13 publications

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“…Although it is not sure whether there is a continuity between members from the Mesozoic and from the Cenozoic (Matsuzaki et al, 2015). (Petrushevskaya, 1975;De Wever et al, 2001;Afanasieva and Amon, 2006;Dumitrica, 2017). Wever et al, 2001Wever et al, , 2003Afanasieva and Amon, 2006).…”

Section: Molecular Clock Analysesmentioning

confidence: 99%

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Morpho-molecular diversity and evolutionary analyses suggest hidden life styles in Spumellaria (Radiolaria)

Sandín

Biard

Romac

et al. 2020

Preprint

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AbstractSpumellaria (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, from the early middle Cambrian (ca. 509-521 Ma), extremely valuable for paleo-environmental reconstruction studies. Spumellaria are tedious to maintain in laboratory conditions preventing an accurate perception of their extant diversity and ecology in today’s oceans, most of which being inferred from sediment records. This study represents an integrated and 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 taxonomic rank classification. Such reconsideration allows gathering different morphologies with concentric structure and a spherical or radial symmetry believed to belong to other Radiolaria orders from the fossil record, as for some Entactinaria families. Results obtained in this study suggest the existence of new Spumellaria diversity at early diverging positions, in which a non-bearing skeleton organism lives within shelled ones. Using fossil calibrated molecular clock we estimated the origin of Spumellaria in the middle Cambrian (ca. 515 Ma), in agreement with the appearance of the first radiolarian representatives in the fossil record. The morpho-molecular and evolutionary framework established herein allows a direct connection between living specimens and fossil morphologies from the Cambrian, bringing both a standpoint for future molecular environmental surveys and a better understanding for paleo-environmental reconstruction studies.

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Section: Molecular Clock Analysesmentioning

confidence: 99%

“…· 9. Coccodiscoidea N(45, 10): The family Coccodiscoidea appears for the first time in the fossil record in the Early Eocene (De Wever et al, 2001;Afanasieva and Amon, 2006).…”

Section: Molecular Clock Analysesmentioning

confidence: 99%

Morpho-molecular diversity and evolutionary analyses suggest hidden life styles in Spumellaria (Radiolaria)

Sandín

Biard

Romac

et al. 2020

Preprint

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“…They are abundant in normal marine salinity, 30-35 parts per thousand (Kling, 1978;Anderson, 1983). Polycystine radiolarians are abundant at depths between 50 m to 400 m of the water column (Afanasieva & Amon, 2006). Recent study of the modern radiolarian fauna from the South China Sea shows that the species diversity of radiolarians increases from the shallow surface water to the deep water regions (Chen et al, 2008).…”

Section: Radiolarian Assemblages and Environmentmentioning

confidence: 99%

Lower Carboniferous (Tournaisian) radiolarians from Peninsular Malaysia and their significance

Jasin¹,

Harun²

2011

BGSM

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Lower Carboniferous (Tournaisian) radiolarians are widespread in Peninsular Malaysia especially in the Western Belt. The radiolarians were recorded in the Kubang Pasu Formation of Kedah and Perlis, Kenny Hill Formation, Selangor, Upper Paleozoic rocks from Nenering, north Perak and the chert block in Langkap, Negeri Sembilan. The radiolarians retrieved from the Kubang Pasu and Kenny Hill Formations exhibit very low specific diversity. The chert from Nenering and Langkap yielded moderate diversity (20 species) and high specific diversity (30 species), respectively. The lithologic association of the Kubang Pasu and Kenny Hill Formations comprises chert overlain by turbiditic sandstone and shale, which indicates the depositional environment was in a basin close to a continental margin. The lithologic association of chert from Langkap consists of interbedded chert and shale, which is indicative of basinal environment. The widespread distribution of chert is related to high radiolarian productivity during the Tournaisian. The Tournaisian is also known as a hypersiliceous age. The high productivity of radiolarians was related to upwelling cold dense bottom water that was very rich in siliceous material, oxygen, and nutrients. This bottom current was developed at a glacial north-Gondwanan area and flowed southwards. The chert also can be used as a marker bed for Tournaisian age and is a very important rock unit to define the base of the Kubang Pasu Formation.

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Evolution of oceanic redox conditions during the Permo-Triassic transition: Evidence from deepwater radiolarian facies

Feng

Algeo

2014

Earth-Science Reviews

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Biotic crises and stages of radiolarian evolution in the Phanerozoic

Cited by 13 publications

References 13 publications

Morpho-molecular diversity and evolutionary analyses suggest hidden life styles in Spumellaria (Radiolaria)

Morpho-molecular diversity and evolutionary analyses suggest hidden life styles in Spumellaria (Radiolaria)

Lower Carboniferous (Tournaisian) radiolarians from Peninsular Malaysia and their significance

Evolution of oceanic redox conditions during the Permo-Triassic transition: Evidence from deepwater radiolarian facies

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