Radiolaria (Polycystinea)

O’Dogherty, Luis; Suzuki, Noritoshi; Goričan, Špela

doi:10.1016/b978-0-08-102908-4.00143-0

Encyclopedia of Geology 2021

DOI: 10.1016/b978-0-08-102908-4.00143-0

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Radiolaria (Polycystinea)

Luis O’Dogherty

Noritoshi Suzuki

Špela Goričan³

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2023

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“…and Lower Cretaceous age from Deep Sea Drilling Project (DSDP) site 416A in the Central Atlantic Ocean 28 . Cherts were reported to preserve siliceous microfossils such as radiolarians 29 and diatoms 30 and therefore were considered promising for the purposes of finding new diatom fossils. Diverse diatom assemblages were extracted from both Upper Jurassic and Lower Cretaceous cherts (see Methods) (Fig.…”

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Uncertainties surrounding the oldest fossil record of diatoms

Bryłka

Alverson

Pickering

et al. 2023

Sci Rep

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Molecular clocks estimate that diatom microalgae, one of Earth’s foremost primary producers, originated near the Triassic–Jurassic boundary (200 Ma), which is close in age to the earliest, generally accepted diatom fossils of the genus Pyxidicula. During an extensive search for Jurassic diatoms from twenty-five sites worldwide, three sites yielded microfossils initially recognized as diatoms. After applying stringent safeguards and evaluation criteria, however, the fossils found at each of the three sites were rejected as new diatom records. This led us to systematically reexamine published evidence in support of Lower- and Middle-Jurassic Pyxidicula fossils. Although Pyxidicula resembles some extant radial centric diatoms and has character states that may have been similar to those of ancestral diatoms, we describe numerous sources of uncertainty regarding the reliability of these records. We conclude that the Lower Jurassic Pyxidicula fossils were most likely calcareous nannofossils, whereas the Middle Jurassic Pyxidicula species has been reassigned to the Lower Cretaceous and is likely a testate amoeba, not a diatom. Excluding the Pyxidicula fossils widens the gap between the estimated time of origin and the oldest abundant fossil diatom record to 75 million years. This study underscores the difficulties in discovering and validating ancient microfossils.

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mentioning

confidence: 99%

Uncertainties surrounding the oldest fossil record of diatoms

Bryłka

Alverson

Pickering

et al. 2023

Sci Rep

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Radiolaria (Polycystinea)

Cited by 1 publication

References 52 publications

Uncertainties surrounding the oldest fossil record of diatoms

Uncertainties surrounding the oldest fossil record of diatoms

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