Sur quelques nouveaux dinoflagelles des silex cretaces

Deflandre, Georges

doi:10.2113/gssgfbull.s5-xiii.7-9.499

Cited by 6 publications

(3 citation statements)

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“…For example, a 20-µm size break has been recognised among large populations of acanthomorphic acritarchs (Downie 1958), a boundary that has been used to distinguish the large-sized (> 20 µm) taxon Baltisphaeridium Eisenack (1958), emend. Downie and Sarjeant (1963) from the small-sized (< 20 µm) taxon Micrhystridium Deflandre (1937), emend. Downie and Sarjeant (1963).…”

Section: Discussionmentioning

confidence: 99%

Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity

Wallet,

Slater,

Willman

2023

Palynology

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The early Cambrian Buen Formation (North Greenland) hosts an exceptionally rich fossil biota that has contributed significantly to our knowledge of early metazoans, yet the fossil remains of primary producers from this deposit have received less attention. Here we examine the palynological component of the Buen Formation, with a focus on acritarchs and filamentous microfossils. Our analysis revealed the presence of 49 form taxa, 15 of which are described for the first time in the Buen Formation. These include large elements of presumably benthic origin, together with cyst-like acritarchs. Comasphaeridium longispinosum Vidal 1993 is renamed Comasphaeridium? brillesensis nom. nov., and Comasphaeridium densispinosum Vidal 1993 is reassigned to a new genus, Pearisphaeridium, becoming Pearisphaeridium densispinosum comb. nov. The diagnoses of Pearisphaeridium densispinosum (Vidal 1993) comb. nov. and Skiagia pura Moczydłowska 1988 are emended. Further, careful analysis of disparity in the recovered assemblage has revealed the presence of numerous transitional morphologies among the recorded acritarch form taxa. Though some of these transitional forms likely represent biologically meaningful entities (e.g. life cycle stages, ecophenotypes), others appear to have been artificially generated by taphonomic processes. Accounting for taphonomic factors and other sources of morphological variation has curtailed diversity down to 30 acritarch morphotypes, ten of which represent distinct abundance peaks broadly corresponding to acritarch genera. This analysis illustrates how population-based studies of early Cambrian acritarchs can help to discern the different factors that impinge on acritarch morphology, detect instances of taxonomic inflation, and refine our measures of diversity at the base of early Palaeozoic food webs.

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Section: Discussionmentioning

confidence: 99%

Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity

Wallet,

Slater,

Willman

2023

Palynology

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“…nov. The processes on the apical and antapical areas, and the ventral interruption of the equatorial pericoel, mark the differences with Stephodinium pellucidum Deflandre (1943) and with Stephodinium? parvum De Coninck (1986).…”

Section: Genus Spiniferitesmentioning

confidence: 99%

New species of dinoflagellate cysts from the Campanian-Danian chalks at Hallembaye and Turnhout (Belgium) and at Beutenaken (the Netherlands)

Slimani

2001

J. Micropalaeontol.

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Abstract. A palynological study of Campanian-Danian chalks from the quarries at Beutenaken and Hallembaye (Maastricht region) and from a borehole at Turnhout (northern Belgium) has revealed the presence of seven new species and subspecies of dinoflagellate cysts: Exochosphaeridium? Masureae sp. nov., Leberidocysta chlamydata subsp. schiolerii subsp. nov., Odontochitina streelii sp. nov., Pervosphaeridium septatum sp. nov., Spiniferites ramosus subsp. pterocoelus subsp. nov., Stephodinium? spinosum sp. nov. and Xenascus wetzelii sp. nov. Nexosispinum? complicatum described by Slimani (1996) as a new species is now a junior synonym of Pulchrasphaera minuscula Schiøler et al. (1997).

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“…Micracanthodinium setiferum (Lohmann) Deflandre (1937, 114). Holotype: Cladopyxis setifera Lohmann 1902: 64, pl.…”

mentioning

confidence: 99%

Reply to: Comments on Mertens et al. (2022): the taxonomic identity of Micracanthodinium setiferum (Lohmann) Deflandre (Dinophyceae incertae sedis) remains elusive, and its epitypification is not achieved

Mertens

Carbonell-Moore

2022

Palynology

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Sur quelques nouveaux dinoflagelles des silex cretaces

Abstract: Describes several new and one doubtful species of dinoflagellates from Cretaceous chert deposits of the Paris basin, France.

Cited by 6 publications

References 0 publications

Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity

Organic-walled microfossils from the lower Cambrian of North Greenland: a reappraisal of diversity

New species of dinoflagellate cysts from the Campanian-Danian chalks at Hallembaye and Turnhout (Belgium) and at Beutenaken (the Netherlands)

Reply to: Comments on Mertens et al. (2022): the taxonomic identity of Micracanthodinium setiferum (Lohmann) Deflandre (Dinophyceae incertae sedis) remains elusive, and its epitypification is not achieved

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