Gilles Cuny | Université Claude Bernard Lyon 1 (original) (raw)

Papers by Gilles Cuny

Research paper thumbnail of The oldest Gondwanan record of the extinct durophagous hybodontiform chondrichthyan, Strophodus from the Bajocian of Morocco

Swiss Journal of Palaeontology

Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform c... more Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform chondrichthyan, with a stratigraphic range extending from Middle Triassic to the Early Cretaceous. Here, we describe a new species of Strophodus, S. atlasensis sp. nov., based on an incomplete articulated dentition recovered from marine Bajocian deposits of the eastern High Atlas Mountains in Morocco. The new species is diagnosed by a unique combination of dental characters that includes, among others, the presence of triangular first lateral teeth, mesio-distally wide and bulbous second lateral teeth without an occlusal crest or dome and uniquely shaped first posterior teeth that are shorter mesio-distally than being labio-lingually long, as well as small second posterior teeth whose roots protrude below the crowns to meet each other in an efficient interlocking manner. The holotype and only specimen of Strophodus atlasensis sp. nov. represents the hitherto oldest known record of Stropho...

Research paper thumbnail of Comment on “An early Miocene extinction in pelagic sharks”

Science, 2021

Sibert and Rubin (Reports, 4 June 2021, p. 1105) claim to have identified a previously unidentifi... more Sibert and Rubin (Reports, 4 June 2021, p. 1105) claim to have identified a previously unidentified, major extinction event of open-ocean sharks in the early Miocene. We argue that their interpretations are based on an experimental design that does not account for a considerable rise in the sedimentation rate coinciding with the proposed event, nor for intraspecific variation in denticle morphology.

Research paper thumbnail of First record of hybodont egg capsules from the Jurassic of Thailand

Annales de paléontologie, 2023

Two egg capsules of Palaeoxyris sp. are reported from the Jurassic Phu Kradung Formation in the K... more Two egg capsules of Palaeoxyris sp. are reported from the Jurassic Phu Kradung Formation in the Khorat Plateau, northeastern Thailand. As the record of this genus remains rare in the Jurassic, it complements its stratigraphic distribution. Most importantly, it represents the first unambiguous evidence that some hybodont sharks from the Mesozoic of Thailand were able to reproduce in fresh waters, even if it is not yet possible to identify which species in particular. RÉSUMÉ Deux capsules ovigères de Palaeoxyris sp. ont été découvertes sur le plateau de Khorat dans le nord-est de la Thaïlande. Les spécimens proviennent de la Formation Phu Kradung, datée du Jurassique. Le registre fossile de ce genre demeurant mal connu au Jurassique, cette découverte permet de compléter sa distribution stratigraphique. Ces capsules ovigères représentent la première preuve indéniable que durant le Mésozoïque certains requins hybodontes se reproduisaient dans les eaux douces thaïlandaises, même s'il n'est pas encore possible d'identifier quelles espèces en particulier.

Research paper thumbnail of New data on Cretaceous freshwater hybodont sharks from Guangxi Province, South China

HAL (Le Centre pour la Communication Scientifique Directe), 2017

The Lower Cretaceous Xinlong Formation in Guangxi Zhuang Autonomous region, which was deposited i... more The Lower Cretaceous Xinlong Formation in Guangxi Zhuang Autonomous region, which was deposited in a non-marine, fluvial environment, has yielded a diverse assemblage of vertebrates. The study of the shark teeth from the Xinlong Formation revealed the presence of teeth of Acrorhizodus khoratensis that do not appear to correspond to a jaw position retrieved in Thailand. It also provides a new understanding of the systematic affinities of the species \textquotedblleftHybodus\textquotedblright aequitridentatus. The latter does not belong to te genus Hybodus but to a new genus belonging to the family Thaiodontidae. The material found in the Xinlong Formation also questions our understanding of the heterodonty pattern of the genus Acrorhizodus and highlights how peculiar this genus is among Hybodontiformes. As only two teeth differ significantly from the material retrieved in Thailand, it is difficult to assess whether the Chinese material includes a species different from the Thai one, but it certainly calls for a careful reappraisal of all the available material to better assess the heterodonty pattern of this genus.

Research paper thumbnail of The oldest Gondwanan record of the extinct durophagous hybodontiform chondrichthyan, Strophodus from the Bajocian of Morocco

Swiss Journal of Palaeontology, Apr 25, 2023

Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform c... more Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform chondrichthyan, with a stratigraphic range extending from Middle Triassic to the Early Cretaceous. Here, we describe a new species of Strophodus, S. atlasensis sp. nov., based on an incomplete articulated dentition recovered from marine Bajocian deposits of the eastern High Atlas Mountains in Morocco. The new species is diagnosed by a unique combination of dental characters that includes, among others, the presence of triangular first lateral teeth, mesio-distally wide and bulbous second lateral teeth without an occlusal crest or dome and uniquely shaped first posterior teeth that are shorter mesio-distally than being labio-lingually long, as well as small second posterior teeth whose roots protrude below the crowns to meet each other in an efficient interlocking manner. The holotype and only specimen of Strophodus atlasensis sp. nov. represents the hitherto oldest known record of Strophodus from Gondwana and the first record of that genus from the Bajocian, thus adding valuable novel information to our incomplete understanding of the evolutionary history of extinct hybodontiform chondrichthyans.

Research paper thumbnail of New vertebrate remains from the latest Jurassic of the Boulonnais (Northern France)

Neues Jahrbuch für Geologie und Paläontologie, Jan 31, 1991

Research paper thumbnail of A new Triodus species (Xenacanthidae, Xenacanthiformes) from the basal Permian of France (Autun basin, Saône-et-Loire) and its palaeobiogeographical implications

HAL (Le Centre pour la Communication Scientifique Directe), Nov 1, 2021

Research paper thumbnail of Environnements sédimentaires et vertébrés du Trias supérieur (Rhétien) de la carrière de Peygros (Var)

International audienceLa carrière de Peygros dans le Var offre une très belle succession sédiment... more International audienceLa carrière de Peygros dans le Var offre une très belle succession sédimentaire d'âge Rhétien que notre équipe a commencé à étudier en détail l'année dernière, avec l'aimable autorisation de Mme Isabelle Raignault (Société Rio Tinto). La succession est constituée d'intercalations de marnes sombres et de bancs calcaires biodétritiques (débris de bivalves, entroques de crinoïdes) massifs, assez grossiers (calcilutites à calcarénites) et bioturbés, montrant à plusieurs niveaux des restes de coraux et des accumulations de coquilles de brachiopodes. La présence d'invertébrés sténohalins (échinodermes, brachiopodes, coraux), de terriers appartenant à l'ichnogenre Thalassinoides et de structures mamelonnées à granoclassement normal suggère un milieu de dépôt marin côtier (= rampe carbonatée) à salinité « normale » et soumis à l'influence des vagues de tempête. L'assemblage faunique de vertébrés récoltés jusqu'à présent, avec l'a...

Research paper thumbnail of A new chondrichthyan fauna from the Late Jurassic of the Swiss Jura (Kimmeridgian) dominated by hybodonts, chimaeroids and guitarfishes

Papers in Palaeontology, 2017

The fossil record of chondrichthyans (sharks, rays and chimaeroids) principally consists of isola... more The fossil record of chondrichthyans (sharks, rays and chimaeroids) principally consists of isolated teeth, spines and dermal denticles, their cartilaginous skeleton being rarely preserved. Several Late Jurassic chondrichthyan assemblages have been studied in Europe based on large bulk samples, mainly in England, France, Germany and Spain. The first study of this kind in Switzerland is based on controlled excavations in Kimmeridgian deposits related to the construction of the A16 motorway in the Swiss Jura (Porrentruy, NW Switzerland). This study is based on more than 2000 isolated chondrichthyan remains (teeth, dental plates, spines and dermal denticles) and adds to our knowledge of the chondrichthyan distribution at a regional scale in Europe. We describe and identify this new fauna, define a new species of hybodont with crushing‐type dentition (Asteracanthus udulfensis sp. nov.) and report for the first time the carcharhiniform Corysodon cirinensis in Switzerland. By the Late Jur...

Research paper thumbnail of Miocene (Burdigalian) seawater and air temperatures estimated from the geochemistry of fossil remains from the Aquitaine Basin, France

Palaeogeography, Palaeoclimatology, Palaeoecology, Sep 1, 2017

Construction work of the Highway A65 led the top of the Burdigalian 'Molasses de l'Armagnac' Form... more Construction work of the Highway A65 led the top of the Burdigalian 'Molasses de l'Armagnac' Formation to outcrop in two close localities near the town of Bazas and Marimbault, situated on the western edge of the Aquitaine Basin, France. From this formation, a rich fossil assemblage has been recovered and includes both marine and terrestrial fossil remains which offered the opportunity to reconstruct both seawater and terrestrial air temperatures at a regional scale during the Burdigalian. For this purpose, two sets of fossil samples representative of the whole assemblage have been selected for each locality. They include teeth and bones of sharks, fish, rays, reptiles and mammals, as well as tests of sea urchins and shells of bivalves. First, we performed rare earth element (REE) analyses of 53 apatite samples from both localities in order to characterize the diagenetic history of the assemblage. We then analysed the oxygen isotope composition of 49 biogenic apatite phosphate samples and 6 biogenic carbonate samples representing both marine and terrestrial organisms. Using published isotopic fractionation equations, both seawater and terrestrial air temperatures were reconstructed. Calculated seawater temperatures using phosphate and carbonate isotopic thermometers are +23±4°C

Research paper thumbnail of Pollen 3D: An Application of 3D Reconstruction for the Scanning Electron Microscope

Le Centre pour la Communication Scientifique Directe - HAL - UFC - Université de Franche-Comté, Nov 2, 2021

A three-dimensional model of small size samples enables the development of accurate solutions for... more A three-dimensional model of small size samples enables the development of accurate solutions for their conservation, education, and metrology. Due to its high magnification, the scanning electron microscope can deliver images that fit the required level of model resolution. In this work a three-dimensional reconstruction application for the scanning electron microscope, called Pollen 3D, is shown. It is based on autocalibration and its testing with images from many samples (biological, geological, and artificial) by using images recorded with two different microscopes (Auriga from Zeiss and Quattro from ThermoFisher) demonstrate its efficiency and accuracy.

Research paper thumbnail of Revision of Isanodus paladeji (Elasmobranchii, Hybodontiformes) from the Lower Cretaceous of Thailand

PalZ, 2015

Microremains from the Lower Cretaceous Phu Phan Thong locality, Nong Bua Lam Phu Province, northe... more Microremains from the Lower Cretaceous Phu Phan Thong locality, Nong Bua Lam Phu Province, northeastern Thailand, yielded ten tooth morphotypes of the freshwater shark genus Isanodus, which allow the revision of this genus. Two new morphotypes assigned to anterolateral and posterolateral teeth possess shared characters with anterior and posterior teeth of Isanodus paladeji whereas its former anterolateral and posterolateral teeth appear to belong to a new species, Isanodus nongbualamphuensis sp. nov. The pattern of ornamentation in some teeth of I. paladeji and I. nongbualamphuensis is quite similar to that observed in the genus Heteroptychodus, suggesting these two genera are closely related. Keywords Isanodus Á Elasmobranchii Á Hybodontiformes Á Lower Cretaceous Á Thailand Kurzfassung Mikro-Ü berreste aus der Unterkreide von Phu Phan Thong Ort, Nong Bua Lam Phu Province, Thailand, ergaben zehn Zahnmorphotypen der Süßwasser Hai-Gattung Isanodus, die eine Revision dieser Gattung erlauben. Zwei neue Morphotypen besitzen gemeinsame Merkmale mit vorderen und hinteren Zähnen von Isanodus paladeji und werden als anterolaterale oder posterolaterale Zähne betrachtet. Die Zähne, die früher als anterolaterale oder posterolaterale Zähne von I. paladeji identifiziert wurden, scheinen in der Tat zu einer neuen Art, Isanodus nongbualamphuensis sp. nov., zu gehören. Zwei Morphotypen können nicht zu einer dieser beiden Arten gehören und zeigen die Anwesenheit einer dritten Art. Das Ornamentations-Muster in einigen Zähnen von I. paladeji und I. nongbualamphuensis sp. nov. ist ziemlich ähnlich dem in der Gattung Heteroptychodus beobachteten, was eine eng Verwandtschaft dieser beiden Gattungen andeutet.

Research paper thumbnail of Phylogenetic implications of the systematic reassessment of Xenacanthiformes and ‘Ctenacanthiformes’ (Chondrichthyes) neurocrania from the Carboniferous–Permian Autun Basin (France)

Journal of Systematic Palaeontology

Research paper thumbnail of A review of the sauropod dinosaurs of Thailand

Proceedings of the …, 2002

... of the Sauropod Dinosaurs of Thailand Eric Buffetaut1, Varavudh Suteethorn2, Jean Le Loeuff, ... more ... of the Sauropod Dinosaurs of Thailand Eric Buffetaut1, Varavudh Suteethorn2, Jean Le Loeuff, Gilles ... CONCLUSIONS The Thai record of sauropod dinosaurs is thus remarkable for both its ... sauropods have been found, and the sauropods from the Nam Phong Formation clearly ...

Research paper thumbnail of On the rarity of anterior teeth of Asteracanthus magnus (Euselachii: Hybodontiformes)

Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 2016

A partial dentition found in the Middle Jurassic (Bathonian) of Normandy (France) associates late... more A partial dentition found in the Middle Jurassic (Bathonian) of Normandy (France) associates lateral teeth of Asteracanthus magnus with anterior teeth usually attributed to A. tenuis or A. longidens. According to this French specimen, teeth usually identified as anterior of A. magnus represent in fact teeth of the first lateral file. This discovery explains the apparent rarity of isolated anterior teeth of A. magnus in the fossil record, for which no associated dentition were hitherto known. It also demonstrates that the general arrangement of the dentition of A. magnus is closer to the one of A. smithwoodwardi than to the one of A. medius.

Research paper thumbnail of Xenoxylon, a boreal fossil wood in the Mesozoic redbeds of Southeast Asia: Potential for the stratigraphy of the Khorat group and the palinspatic reconstruction of Southeast Asia

Journal of Asian Earth Sciences, 2019

Research paper thumbnail of New data on the flora and fauna from the ?uppermost Carboniferous-Lower Permian of Buxieres-les-Mines, Bourbon l'Archambault Basin (Allier, France); a preliminary report

Bulletin de la Société Géologique de France, 2000

New fossils from the ?uppermost Carboniferous-Lower Permian have been found at Buxieres-les-Mines... more New fossils from the ?uppermost Carboniferous-Lower Permian have been found at Buxieres-les-Mines (Massif central, France). In this preliminary article we report on algae, stromatolites, palynomorphs, macroflora, ostracods, insects, elasmobranchs, acanthodians, actinopterygians and amphibians. Elasmobranchs and amphibians are diversified compared with those of other European localities. Most taxa indicate lacustrine deposits and an Asselian age, and permit us to address the question of the palaeoecosystem evolution of the Bourbon-l'Archambault Basin, during the Lower Permian.

Research paper thumbnail of First hybodont shark assemblage from the Cretaceous of Malaysia: updated report

A new hybodont assemblage was found in Cretaceous freshwater sediment of Peninsular Malaysia. Thi... more A new hybodont assemblage was found in Cretaceous freshwater sediment of Peninsular Malaysia. This is the first discovery of Mesozoic nonmarine fishes from Malaysia. A faunal comparison with the Khorat Group has also been carried out. Approximately 100 specimens were prepared and examined in this study. The Malaysian material provides a finer understanding of morphological variation in the teeth of freshwater hybodont sharks from Southeastern Asia, as well as of their distribution. It points out for the first time to a biostratigraphical correlation between the Cretaceous freshwater deposits in Peninsular Malaysia with those of the Khorat Group in Thailand.

Research paper thumbnail of Enameloid Microstructure in Rays

Skates and rays, also referred to as batomorphs, represent the most diverse group of modern chond... more Skates and rays, also referred to as batomorphs, represent the most diverse group of modern chondrichthyans, with 633 known species. They show a wide range of morphological and ecological preferences and are found in almost all of the ecological niches occupied by modern sharks. With the latter, they form the group of neoselachians; although the monophyly of modern sharks (selachimorphs) is well established today in terms of both molecular and morphological characteristics, this has not always been the case. In fact, a very popular hypothesis in the late 1990s claimed that skates and rays were a highly derived group of sharks, related to forms such as the Squatiniformes (angel sharks) and the Pristiophoriformes (sawsharks). These mostly benthic groups do share numerous morphological characteristics with skates and rays, but this hypothesis was definitively refuted by the first molecular phylogenies, the results of which confirmed the initial morphological analyses that skates and ra...

Research paper thumbnail of A new site with articulated fish remains (Actinopterygii: Holostei) from the Late Triassic of Thailand

Research paper thumbnail of The oldest Gondwanan record of the extinct durophagous hybodontiform chondrichthyan, Strophodus from the Bajocian of Morocco

Swiss Journal of Palaeontology

Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform c... more Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform chondrichthyan, with a stratigraphic range extending from Middle Triassic to the Early Cretaceous. Here, we describe a new species of Strophodus, S. atlasensis sp. nov., based on an incomplete articulated dentition recovered from marine Bajocian deposits of the eastern High Atlas Mountains in Morocco. The new species is diagnosed by a unique combination of dental characters that includes, among others, the presence of triangular first lateral teeth, mesio-distally wide and bulbous second lateral teeth without an occlusal crest or dome and uniquely shaped first posterior teeth that are shorter mesio-distally than being labio-lingually long, as well as small second posterior teeth whose roots protrude below the crowns to meet each other in an efficient interlocking manner. The holotype and only specimen of Strophodus atlasensis sp. nov. represents the hitherto oldest known record of Stropho...

Research paper thumbnail of Comment on “An early Miocene extinction in pelagic sharks”

Science, 2021

Sibert and Rubin (Reports, 4 June 2021, p. 1105) claim to have identified a previously unidentifi... more Sibert and Rubin (Reports, 4 June 2021, p. 1105) claim to have identified a previously unidentified, major extinction event of open-ocean sharks in the early Miocene. We argue that their interpretations are based on an experimental design that does not account for a considerable rise in the sedimentation rate coinciding with the proposed event, nor for intraspecific variation in denticle morphology.

Research paper thumbnail of First record of hybodont egg capsules from the Jurassic of Thailand

Annales de paléontologie, 2023

Two egg capsules of Palaeoxyris sp. are reported from the Jurassic Phu Kradung Formation in the K... more Two egg capsules of Palaeoxyris sp. are reported from the Jurassic Phu Kradung Formation in the Khorat Plateau, northeastern Thailand. As the record of this genus remains rare in the Jurassic, it complements its stratigraphic distribution. Most importantly, it represents the first unambiguous evidence that some hybodont sharks from the Mesozoic of Thailand were able to reproduce in fresh waters, even if it is not yet possible to identify which species in particular. RÉSUMÉ Deux capsules ovigères de Palaeoxyris sp. ont été découvertes sur le plateau de Khorat dans le nord-est de la Thaïlande. Les spécimens proviennent de la Formation Phu Kradung, datée du Jurassique. Le registre fossile de ce genre demeurant mal connu au Jurassique, cette découverte permet de compléter sa distribution stratigraphique. Ces capsules ovigères représentent la première preuve indéniable que durant le Mésozoïque certains requins hybodontes se reproduisaient dans les eaux douces thaïlandaises, même s'il n'est pas encore possible d'identifier quelles espèces en particulier.

Research paper thumbnail of New data on Cretaceous freshwater hybodont sharks from Guangxi Province, South China

HAL (Le Centre pour la Communication Scientifique Directe), 2017

The Lower Cretaceous Xinlong Formation in Guangxi Zhuang Autonomous region, which was deposited i... more The Lower Cretaceous Xinlong Formation in Guangxi Zhuang Autonomous region, which was deposited in a non-marine, fluvial environment, has yielded a diverse assemblage of vertebrates. The study of the shark teeth from the Xinlong Formation revealed the presence of teeth of Acrorhizodus khoratensis that do not appear to correspond to a jaw position retrieved in Thailand. It also provides a new understanding of the systematic affinities of the species \textquotedblleftHybodus\textquotedblright aequitridentatus. The latter does not belong to te genus Hybodus but to a new genus belonging to the family Thaiodontidae. The material found in the Xinlong Formation also questions our understanding of the heterodonty pattern of the genus Acrorhizodus and highlights how peculiar this genus is among Hybodontiformes. As only two teeth differ significantly from the material retrieved in Thailand, it is difficult to assess whether the Chinese material includes a species different from the Thai one, but it certainly calls for a careful reappraisal of all the available material to better assess the heterodonty pattern of this genus.

Research paper thumbnail of The oldest Gondwanan record of the extinct durophagous hybodontiform chondrichthyan, Strophodus from the Bajocian of Morocco

Swiss Journal of Palaeontology, Apr 25, 2023

Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform c... more Strophodus is a speciose and geographically widespread taxon of large durophagous hybodontiform chondrichthyan, with a stratigraphic range extending from Middle Triassic to the Early Cretaceous. Here, we describe a new species of Strophodus, S. atlasensis sp. nov., based on an incomplete articulated dentition recovered from marine Bajocian deposits of the eastern High Atlas Mountains in Morocco. The new species is diagnosed by a unique combination of dental characters that includes, among others, the presence of triangular first lateral teeth, mesio-distally wide and bulbous second lateral teeth without an occlusal crest or dome and uniquely shaped first posterior teeth that are shorter mesio-distally than being labio-lingually long, as well as small second posterior teeth whose roots protrude below the crowns to meet each other in an efficient interlocking manner. The holotype and only specimen of Strophodus atlasensis sp. nov. represents the hitherto oldest known record of Strophodus from Gondwana and the first record of that genus from the Bajocian, thus adding valuable novel information to our incomplete understanding of the evolutionary history of extinct hybodontiform chondrichthyans.

Research paper thumbnail of New vertebrate remains from the latest Jurassic of the Boulonnais (Northern France)

Neues Jahrbuch für Geologie und Paläontologie, Jan 31, 1991

Research paper thumbnail of A new Triodus species (Xenacanthidae, Xenacanthiformes) from the basal Permian of France (Autun basin, Saône-et-Loire) and its palaeobiogeographical implications

HAL (Le Centre pour la Communication Scientifique Directe), Nov 1, 2021

Research paper thumbnail of Environnements sédimentaires et vertébrés du Trias supérieur (Rhétien) de la carrière de Peygros (Var)

International audienceLa carrière de Peygros dans le Var offre une très belle succession sédiment... more International audienceLa carrière de Peygros dans le Var offre une très belle succession sédimentaire d'âge Rhétien que notre équipe a commencé à étudier en détail l'année dernière, avec l'aimable autorisation de Mme Isabelle Raignault (Société Rio Tinto). La succession est constituée d'intercalations de marnes sombres et de bancs calcaires biodétritiques (débris de bivalves, entroques de crinoïdes) massifs, assez grossiers (calcilutites à calcarénites) et bioturbés, montrant à plusieurs niveaux des restes de coraux et des accumulations de coquilles de brachiopodes. La présence d'invertébrés sténohalins (échinodermes, brachiopodes, coraux), de terriers appartenant à l'ichnogenre Thalassinoides et de structures mamelonnées à granoclassement normal suggère un milieu de dépôt marin côtier (= rampe carbonatée) à salinité « normale » et soumis à l'influence des vagues de tempête. L'assemblage faunique de vertébrés récoltés jusqu'à présent, avec l'a...

Research paper thumbnail of A new chondrichthyan fauna from the Late Jurassic of the Swiss Jura (Kimmeridgian) dominated by hybodonts, chimaeroids and guitarfishes

Papers in Palaeontology, 2017

The fossil record of chondrichthyans (sharks, rays and chimaeroids) principally consists of isola... more The fossil record of chondrichthyans (sharks, rays and chimaeroids) principally consists of isolated teeth, spines and dermal denticles, their cartilaginous skeleton being rarely preserved. Several Late Jurassic chondrichthyan assemblages have been studied in Europe based on large bulk samples, mainly in England, France, Germany and Spain. The first study of this kind in Switzerland is based on controlled excavations in Kimmeridgian deposits related to the construction of the A16 motorway in the Swiss Jura (Porrentruy, NW Switzerland). This study is based on more than 2000 isolated chondrichthyan remains (teeth, dental plates, spines and dermal denticles) and adds to our knowledge of the chondrichthyan distribution at a regional scale in Europe. We describe and identify this new fauna, define a new species of hybodont with crushing‐type dentition (Asteracanthus udulfensis sp. nov.) and report for the first time the carcharhiniform Corysodon cirinensis in Switzerland. By the Late Jur...

Research paper thumbnail of Miocene (Burdigalian) seawater and air temperatures estimated from the geochemistry of fossil remains from the Aquitaine Basin, France

Palaeogeography, Palaeoclimatology, Palaeoecology, Sep 1, 2017

Construction work of the Highway A65 led the top of the Burdigalian 'Molasses de l'Armagnac' Form... more Construction work of the Highway A65 led the top of the Burdigalian 'Molasses de l'Armagnac' Formation to outcrop in two close localities near the town of Bazas and Marimbault, situated on the western edge of the Aquitaine Basin, France. From this formation, a rich fossil assemblage has been recovered and includes both marine and terrestrial fossil remains which offered the opportunity to reconstruct both seawater and terrestrial air temperatures at a regional scale during the Burdigalian. For this purpose, two sets of fossil samples representative of the whole assemblage have been selected for each locality. They include teeth and bones of sharks, fish, rays, reptiles and mammals, as well as tests of sea urchins and shells of bivalves. First, we performed rare earth element (REE) analyses of 53 apatite samples from both localities in order to characterize the diagenetic history of the assemblage. We then analysed the oxygen isotope composition of 49 biogenic apatite phosphate samples and 6 biogenic carbonate samples representing both marine and terrestrial organisms. Using published isotopic fractionation equations, both seawater and terrestrial air temperatures were reconstructed. Calculated seawater temperatures using phosphate and carbonate isotopic thermometers are +23±4°C

Research paper thumbnail of Pollen 3D: An Application of 3D Reconstruction for the Scanning Electron Microscope

Le Centre pour la Communication Scientifique Directe - HAL - UFC - Université de Franche-Comté, Nov 2, 2021

A three-dimensional model of small size samples enables the development of accurate solutions for... more A three-dimensional model of small size samples enables the development of accurate solutions for their conservation, education, and metrology. Due to its high magnification, the scanning electron microscope can deliver images that fit the required level of model resolution. In this work a three-dimensional reconstruction application for the scanning electron microscope, called Pollen 3D, is shown. It is based on autocalibration and its testing with images from many samples (biological, geological, and artificial) by using images recorded with two different microscopes (Auriga from Zeiss and Quattro from ThermoFisher) demonstrate its efficiency and accuracy.

Research paper thumbnail of Revision of Isanodus paladeji (Elasmobranchii, Hybodontiformes) from the Lower Cretaceous of Thailand

PalZ, 2015

Microremains from the Lower Cretaceous Phu Phan Thong locality, Nong Bua Lam Phu Province, northe... more Microremains from the Lower Cretaceous Phu Phan Thong locality, Nong Bua Lam Phu Province, northeastern Thailand, yielded ten tooth morphotypes of the freshwater shark genus Isanodus, which allow the revision of this genus. Two new morphotypes assigned to anterolateral and posterolateral teeth possess shared characters with anterior and posterior teeth of Isanodus paladeji whereas its former anterolateral and posterolateral teeth appear to belong to a new species, Isanodus nongbualamphuensis sp. nov. The pattern of ornamentation in some teeth of I. paladeji and I. nongbualamphuensis is quite similar to that observed in the genus Heteroptychodus, suggesting these two genera are closely related. Keywords Isanodus Á Elasmobranchii Á Hybodontiformes Á Lower Cretaceous Á Thailand Kurzfassung Mikro-Ü berreste aus der Unterkreide von Phu Phan Thong Ort, Nong Bua Lam Phu Province, Thailand, ergaben zehn Zahnmorphotypen der Süßwasser Hai-Gattung Isanodus, die eine Revision dieser Gattung erlauben. Zwei neue Morphotypen besitzen gemeinsame Merkmale mit vorderen und hinteren Zähnen von Isanodus paladeji und werden als anterolaterale oder posterolaterale Zähne betrachtet. Die Zähne, die früher als anterolaterale oder posterolaterale Zähne von I. paladeji identifiziert wurden, scheinen in der Tat zu einer neuen Art, Isanodus nongbualamphuensis sp. nov., zu gehören. Zwei Morphotypen können nicht zu einer dieser beiden Arten gehören und zeigen die Anwesenheit einer dritten Art. Das Ornamentations-Muster in einigen Zähnen von I. paladeji und I. nongbualamphuensis sp. nov. ist ziemlich ähnlich dem in der Gattung Heteroptychodus beobachteten, was eine eng Verwandtschaft dieser beiden Gattungen andeutet.

Research paper thumbnail of Phylogenetic implications of the systematic reassessment of Xenacanthiformes and ‘Ctenacanthiformes’ (Chondrichthyes) neurocrania from the Carboniferous–Permian Autun Basin (France)

Journal of Systematic Palaeontology

Research paper thumbnail of A review of the sauropod dinosaurs of Thailand

Proceedings of the …, 2002

... of the Sauropod Dinosaurs of Thailand Eric Buffetaut1, Varavudh Suteethorn2, Jean Le Loeuff, ... more ... of the Sauropod Dinosaurs of Thailand Eric Buffetaut1, Varavudh Suteethorn2, Jean Le Loeuff, Gilles ... CONCLUSIONS The Thai record of sauropod dinosaurs is thus remarkable for both its ... sauropods have been found, and the sauropods from the Nam Phong Formation clearly ...

Research paper thumbnail of On the rarity of anterior teeth of Asteracanthus magnus (Euselachii: Hybodontiformes)

Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 2016

A partial dentition found in the Middle Jurassic (Bathonian) of Normandy (France) associates late... more A partial dentition found in the Middle Jurassic (Bathonian) of Normandy (France) associates lateral teeth of Asteracanthus magnus with anterior teeth usually attributed to A. tenuis or A. longidens. According to this French specimen, teeth usually identified as anterior of A. magnus represent in fact teeth of the first lateral file. This discovery explains the apparent rarity of isolated anterior teeth of A. magnus in the fossil record, for which no associated dentition were hitherto known. It also demonstrates that the general arrangement of the dentition of A. magnus is closer to the one of A. smithwoodwardi than to the one of A. medius.

Research paper thumbnail of Xenoxylon, a boreal fossil wood in the Mesozoic redbeds of Southeast Asia: Potential for the stratigraphy of the Khorat group and the palinspatic reconstruction of Southeast Asia

Journal of Asian Earth Sciences, 2019

Research paper thumbnail of New data on the flora and fauna from the ?uppermost Carboniferous-Lower Permian of Buxieres-les-Mines, Bourbon l'Archambault Basin (Allier, France); a preliminary report

Bulletin de la Société Géologique de France, 2000

New fossils from the ?uppermost Carboniferous-Lower Permian have been found at Buxieres-les-Mines... more New fossils from the ?uppermost Carboniferous-Lower Permian have been found at Buxieres-les-Mines (Massif central, France). In this preliminary article we report on algae, stromatolites, palynomorphs, macroflora, ostracods, insects, elasmobranchs, acanthodians, actinopterygians and amphibians. Elasmobranchs and amphibians are diversified compared with those of other European localities. Most taxa indicate lacustrine deposits and an Asselian age, and permit us to address the question of the palaeoecosystem evolution of the Bourbon-l'Archambault Basin, during the Lower Permian.

Research paper thumbnail of First hybodont shark assemblage from the Cretaceous of Malaysia: updated report

A new hybodont assemblage was found in Cretaceous freshwater sediment of Peninsular Malaysia. Thi... more A new hybodont assemblage was found in Cretaceous freshwater sediment of Peninsular Malaysia. This is the first discovery of Mesozoic nonmarine fishes from Malaysia. A faunal comparison with the Khorat Group has also been carried out. Approximately 100 specimens were prepared and examined in this study. The Malaysian material provides a finer understanding of morphological variation in the teeth of freshwater hybodont sharks from Southeastern Asia, as well as of their distribution. It points out for the first time to a biostratigraphical correlation between the Cretaceous freshwater deposits in Peninsular Malaysia with those of the Khorat Group in Thailand.

Research paper thumbnail of Enameloid Microstructure in Rays

Skates and rays, also referred to as batomorphs, represent the most diverse group of modern chond... more Skates and rays, also referred to as batomorphs, represent the most diverse group of modern chondrichthyans, with 633 known species. They show a wide range of morphological and ecological preferences and are found in almost all of the ecological niches occupied by modern sharks. With the latter, they form the group of neoselachians; although the monophyly of modern sharks (selachimorphs) is well established today in terms of both molecular and morphological characteristics, this has not always been the case. In fact, a very popular hypothesis in the late 1990s claimed that skates and rays were a highly derived group of sharks, related to forms such as the Squatiniformes (angel sharks) and the Pristiophoriformes (sawsharks). These mostly benthic groups do share numerous morphological characteristics with skates and rays, but this hypothesis was definitively refuted by the first molecular phylogenies, the results of which confirmed the initial morphological analyses that skates and ra...

Research paper thumbnail of A new site with articulated fish remains (Actinopterygii: Holostei) from the Late Triassic of Thailand

Research paper thumbnail of LETTER TO THE EDITOR OF MARINE POLICY - publication refused

An article: Rebuttal to “Response to ‘A United States shark fin ban would undermine sustainable s... more An article:
Rebuttal to “Response to ‘A United States shark fin ban would undermine sustainable shark fisheries’ I.F. Porcher et al., Marine Policy 104 (2019) 85–89” RE Hueter & DS Shiffman
https://doi.org/10.1016/j.marpol.2019.103601 (Marine Policy : Available online 10 July 2019, In Press, Corrected Proof)
purports to show the falsity of the captioned paper. It does no such thing.

Research paper thumbnail of Response to “A United States shark fin ban would undermine sustainable shark fisheries” D.S. Shiffman & R.E. Hueter, Marine Policy 85 (2017) 138–140

Marine Policy, 2019

The paper entitled “A United States shark fin ban would undermine sustainable shark fisheries” (D... more The paper entitled “A United States shark fin ban would undermine sustainable shark fisheries” (D.S. Shiffman & R.E. Hueter, Marine Policy 85 (2017) 138–140) argues that The Shark Fin Trade Elimination Act of 2017 (HR 1456) and its companion bill in the Senate (S 793), now before Congress in the United States of America, would be counterproductive. We demonstrate that the figures used in support of this claim are inappropriately selected, misinterpreted or incorrect, and that therefore the argument cannot stand. In the face of the extreme depletion of shark numbers globally, the paper fails to give an accurate or objective assessment of the situation.
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[Now published: text on request]

Research paper thumbnail of Response to “A United States shark fin ban would undermine sustainable shark fisheries” D.S. Shiffman & R.E. Hueter, Marine Policy 85 (2017) 138–140

Marine Policy, 2019

The paper entitled “A United States shark fin ban would undermine sustainable shark fisheries” (D... more The paper entitled “A United States shark fin ban would undermine sustainable shark fisheries” (D.S. Shiffman & R.E. Hueter, Marine Policy 85 (2017) 138–140) argues that The Shark Fin Trade Elimination Act of 2017 (HR 1456) and its companion bill in the Senate (S 793), now before Congress in the United States of America, would be counterproductive. We demonstrate that the figures used in support of this claim are inappropriately selected, misinterpreted or incorrect, and that therefore the argument cannot stand. In the face of the extreme depletion of shark numbers globally, the paper fails to give an accurate or objective assessment of the situation.