The intriguing marine diatom genus Corethron in Late Cretaceous amber from Vendée (France)

Martin, Simona Saint; Martin, Jean‐Paul Saint; Schmidt, Alexander R.; Girard, Vincent; Néraudeau, Didier; Perrichot, Vincent

doi:10.1016/j.cretres.2014.07.006

Cited by 16 publications

(14 citation statements)

References 71 publications

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“…Yet, aquatic and especially marine organisms are relatively rare in amber considering their overall proportion in amber inclusions. However, there are some aquatic or even marine organisms in many amber localities (Schmidt et al, 2004;Key-ser and Weitschat, 2005;Girard et al, 2008;Saint Martin et al, 2015;Serrano-Sánchez et al, 2015Xing et al, 2018).…”

Section: Fossil Record Of Epicarideamentioning

confidence: 99%

Exceptionally preserved cryptoniscium larvae - morphological details of rare isopod crustaceans from French Cretaceous Vendean amber

Schädel

Perrichot²,

Haug

2019

Palaeontol Electron

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Section: Fossil Record Of Epicarideamentioning

confidence: 99%

Exceptionally preserved cryptoniscium larvae - morphological details of rare isopod crustaceans from French Cretaceous Vendean amber

Schädel

Perrichot²,

Haug

2019

Palaeontol Electron

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“…nov., was found in the La Garnache outcrop together with an undetermined insect as a syninclusion. This amber fossilized numerous microorganisms such as spherasters (sponge spicules) and marine centric diatoms (Saint Martin et al ., ), together with tiny aquatic isopods (family yet undetermined). We have very scarce data with which to make any conclusions on the palaeobiology of this new species.…”

Section: Discussionmentioning

confidence: 99%

“…Vendean amber was deposited within a lignitic shale along a littoral margin and was produced by cupressaceous conifers probably located in a mangrove‐like environment connected to lagoons and brackish swamps and with marine inputs (Perrichot & Néraudeau, ). In addition to the tanaidacean, this amber fossilized numerous remains of aquatic organisms, including spherasters (sponge spicules) and marine centric diatoms (Saint Martin et al ., ), together with tiny undetermined isopods.…”

Section: Geological Settingsmentioning

confidence: 99%

Palaeobiology of tanaidaceans (Crustacea: Peracarida) from Cretaceous ambers: extending the scarce fossil record of a diverse peracarid group

Sánchez‐García

Peñalver

Bird³

et al. 2016

Zool J Linn Soc

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International audienceDiverse assemblages of tanaidacean peracarid crustaceans from western Tethyan continental deposits suggest that the group was relatively common in or around ancient resin-producing forests. Here we report the results of an examination of 13 tanaidacean specimens from three Cretaceous (Albian to Turonian) French amber deposits. Two new species of the fossil family Alavatanaidae are placed in the previously described Early Cretaceous genus Eurotanais: Eurotanais pyrenaensis sp. nov. from Cenomanian Pyrenean amber (Fourtou, Aude) and Eurotanais seilacheri sp. nov. from Turonian Vendean amber (La Garnache, Vendée). The remaining specimens are placed in three newly erected genera and species (but family incertae sedis): Arcantitanais turpis gen. et sp. nov. from Albian–Cenomanian Charentese amber (Archingeay, Charente-Maritime), and Tytthotanais tenvis gen. et sp. nov. and Armadillopsis rara gen. et sp. nov. from Pyrenean amber. These are the first formally described fossils that might be related to the paratanaoidean families Nototanaidae and Paratanaidae, sharing with these some putatively derived features and providing possible evidence for the antiquity and morphological stability of these families and the suborder Tanaidomorpha. The distinctive features and character combinations of these fossil taxa are discussed in connection with possible relationships to the living lineages of tanaidaceans. Propagation phase-contrast X-ray synchrotron microtomography was used to obtain high-quality 3D images for some fossils. A discussion is provided on the putative palaeobiology of tanaidaceans and the French resiniferous forest ecosystem. The discovery of these new tanaidaceans extends the palaeogeographical distribution and stratigraphical range of the family Alavatanaidae and sheds new light on the palaeoecology and diversity of tanaidaceans in pre-angiospermous woodlands

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“…One possible explanation for the origin of 'non-organismic' inclusions in amber was given by Buchberger et al (1997), who observed high contents of water and marine salt ions in droplets encased in Bitterfeld amber (in particular Na + , K + Cl À Br À , and SO 4 2À ), and proposed seawater spray as a likely source for these inclusions. Indeed, tree resin flows in coastal areas may well be exposed to seawater spray, and even inclusions of marine micro-organisms in amber have been documented in exceptional cases (Girard et al, 2008;Masure et al, 2013;Saint Martin et al, 2015). However, we consider this an unlikely scenario for the abundant inclusions in our Agathis samples, as (i) samples were taken from an inland valley approximately 15 km away from the coast, (ii) inclusions were already present in the outpouring resin (see Fig.…”

Section: Lipidsmentioning

confidence: 98%

Microbe‐like inclusions in tree resins and implications for the fossil record of protists in amber

et al. 2016

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During the past two decades, a plethora of fossil micro-organisms have been described from various Triassic to Miocene ambers. However, in addition to entrapped microbes, ambers commonly contain microscopic inclusions that sometimes resemble amoebae, ciliates, microfungi, and unicellular algae in size and shape, but do not provide further diagnostic features thereof. For a better assessment of the actual fossil record of unicellular eukaryotes in amber, we studied equivalent inclusions in modern resin of the Araucariaceae; this conifer family comprises important amber-producers in Earth history. Using time-of-flight secondary ion mass spectrometry (ToF-SIMS), we investigated the chemical nature of the inclusion matter and the resin matrix. Whereas the matrix, as expected, showed a more hydrocarbon/aromatic-dominated composition, the inclusions contain abundant salt ions and polar organics. However, the absence of signals characteristic for cellular biomass, namely distinctive proteinaceous amino acids and lipid moieties, indicates that the inclusions do not contain microbial cellular matter but salts and hydrophilic organic substances that probably derived from the plant itself. Rather than representing protists or their remains, these microbe-like inclusions, for which we propose the term 'pseudoinclusions', consist of compounds that are immiscible with the terpenoid resin matrix and were probably secreted in small amounts together with the actual resin by the plant tissue. Consequently, reports of protists from amber that are only based on the similarity of the overall shape and size to extant taxa, but do not provide relevant features at light-microscopical and ultrastructural level, cannot be accepted as unambiguous fossil evidence for these particular groups.

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The intriguing marine diatom genus Corethron in Late Cretaceous amber from Vendée (France)

Cited by 16 publications

References 71 publications

Exceptionally preserved cryptoniscium larvae - morphological details of rare isopod crustaceans from French Cretaceous Vendean amber

Exceptionally preserved cryptoniscium larvae - morphological details of rare isopod crustaceans from French Cretaceous Vendean amber

Palaeobiology of tanaidaceans (Crustacea: Peracarida) from Cretaceous ambers: extending the scarce fossil record of a diverse peracarid group

Microbe‐like inclusions in tree resins and implications for the fossil record of protists in amber

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