Thomas Servais

Unité Évolution, Écologie et Paléontologie

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Jun Li

Nagoya University Hospital

Marco Vecoli

Saudi Aramco (Saudi Arabia)

Axel Munnecke

Friedrich-Alexander-Universität Erlangen-Nürnberg

David A. T. Harper

Durham University

Bertrand Lefèbvre

Université Claude Bernard Lyon 1

Borja Cascales‐Miñana

Université de Lille

Thijs R.A. Vandenbroucke

Ghent University

Kui Yan

Anhui University

Stewart G. Molyneux

British Geological Survey

Jacques Verniers

Ghent University

Cooperative Institutions

Centre National de la Recherche Scientifique

Université de Lille

Chinese Academy of Sciences

Unité Évolution, Écologie et Paléontologie

Nanjing Institute of Geology and Paleontology

Ghent University

University of Chinese Academy of Sciences

State Key Laboratory of Palaeobiology and Stratigraphy

Czech Academy of Sciences, Institute of Geology

China University of Geosciences

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Phytoplankton dynamics across the Ordovician/Silurian boundary at low palaeolatitudes: Correlations with carbon isotopic and glacial events

Palaeogeography Palaeoclimatology Palaeoecology (2011)

Aurélien Delabroye Axel Munnecke Marco Vecoli Paul Copper Nicolas Tribovillard

10.1016/j.palaeo.2011.09.011

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Citations (55)

Paleozoic calcareous plankton: evidence from the Silurian of Gotland

HAL (Le Centre pour la Communication Scientifique Directe) (2008)

Axel Munnecke Thomas Servais

10.1111/j.1502-3931.2008.00113

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Citations (1)

Discovery of themessaoudensis–trifidumacritarch assemblage (upper Tremadocian–lower Floian, Lower Ordovician) in the subsurface of Morocco

Proceedings of the Estonian Academy of Sciences Geology (2015)

Hendrik Nowak Mustapha Akodad Bertrand Lefèbvre Thomas Servais

The upper Tremadocian to lower Floian messaoudensis-trifidum acritarch assemblage was first described from the Skiddaw Group of England and subsequently from several localities on the Gondwanan margin that were positioned in high southern latitudes during the Early Ordovician.It is here reported for the first time from North Africa, from the Fezouata formations (Tremadocian to Floian) in the AZ-1 borehole, southeastern Morocco.The assemblage is comparable with that from the Skiddaw Group, with Cymatiogalea deunffii, C. messaoudensis, C. velifera, Caldariola glabra glabra, Stelliferidium trifidum and Veryhachium lairdii s.l.The Moroccan assemblage indicates a late Tremadocian age.

Acritarch

Assemblage (archaeology)

10.3176/earth.2015.14

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Citations (12)

Eighty years of chitinozoan research: From Alfred Eisenack to Florentin Paris

Review of Palaeobotany and Palynology (2013)

Thomas Servais A. Achab Esther Asselin

Devonian

10.1016/j.revpalbo.2013.05.008

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Citations (7)

The Ordovician Arkonia-Striatotheca acritarch plexus

Review of Palaeobotany and Palynology (1997)

Thomas Servais

Acritarch

Confusion

Plexus

10.1016/s0034-6667(97)00016-x

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Citations (40)

Palaeoecology of Cambrian–Ordovician acritarchs from China: evidence for a progressive invasion of the marine habitats

Philosophical Transactions of the Royal Society B Biological Sciences (2022)

Longlong Shan Kui Yan Yuandong Zhang Jun Li Thomas Servais

Palaeozoic acritarchs mostly represent organic-walled cysts of marine phytoplankton, and therefore, as primary producers, played an important role in the evolution of marine ecosystems. In this study, we use a selection of the most abundant acritarch taxa from the Cambrian and Ordovician of China to understand the evolution of the palaeoecological patterns of the phytoplankton over the period. The taxa are attributed to 40 easily distinguishable morphotypes, of which the precise palaeoenvironmental distribution from 60 localities is available. By placing the 40 morphotypes on inshore–offshore transects it can be concluded that acritarch microfloras were limited to inshore environments during the early Cambrian, and progressively extended from inshore environments to offshore marine habitats during the later parts of the Cambrian and towards the Early Ordovician, with a prominent shift near the Cambrian–Ordovician boundary, confirming the onset of the ‘Ordovician plankton revolution’. In addition, the acritarch morphotypes evolved from low-diversity assemblages in the early Cambrian, dominated by simple spherical forms with limited ornamentation and simple process structures, to highly diverse assemblages with very complex morphologies in the Early and Middle Ordovician. During the Ordovician, the complex acritarch assemblages occupied most marine habitats, with palaeoecological distribution patterns similar to modern dinoflagellates. This article is part of the theme issue ‘The impact of Chinese palaeontology on evolutionary research’.

Acritarch

Paleoecology

10.1098/rstb.2021.0035

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Citations (9)

New directions in Palaeozoic palynology

Review of Palaeobotany and Palynology (2004)

Thomas Servais Charles H. Wellman

10.1016/j.revpalbo.2004.01.001

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Citations (5)

Chitinozoans from the upper Tremadocian (Lower Ordovician) Watch Hill Formation of the Lake District, northern England

Palynology (2017)

Chloé E. A. Amberg Thijs R.A. Vandenbroucke Stewart G. Molyneux Thomas Servais

The Global Stratotype Section and Point (GSSP) for the Lower Ordovician Floian Stage is defined by the first appearance datum (FAD) of the graptolite Tetragraptus approximatus at Diabasbrottet Quarry, Hunneberg, southern Sweden. Correlation of sections with the Floian GSSP when graptolites are absent, however, must rely on other criteria. Among other fossil groups with potential for biostratigraphical correlation at this level are chitinozoans. Here we describe a chitinozoan assemblage from the Watch Hill Formation in the Skiddaw Group of northern England. The Watch Hill Formation is dated on graptolite evidence as late Tremadocian, but the assemblage contains Euconochitina symmetrica, a species previously considered to indicate the eponymous lowermost Arenig (Floian) chitinozoan biozone in a long-established Gondwanan Ordovician biozonal scheme. The hitherto earliest Floian index species has also been reported recently from Tremadocian successions in South China and Morocco. We here confirm its extended range into the Tremadocian and its continued significance as an index species for the Tremadocian–Floian boundary interval.

Biozone

Stratotype

10.1080/01916122.2017.1348721

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Citations (11)

Sem-observation of calcareousmicro- and nannofossils incertae sedis from the Silurian of Gotland, Sweden: Preliminary results

Geobios (1999)

Axel Munnecke Christian Samtleben Thomas Servais Daniel Vachard

Incertae sedis

10.1016/s0016-6995(99)80044-8

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Citations (21)