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September 2014 - August 2019
October 2001 - August 2014
January 1996 - December 2000
Publications
Publications (160)
Hybodontiforms are among the most iconic groups of extinct chondrichthyan fishes to have ever existed and are the putative sister group to the elasmobranch crown group (i.e., modern sharks, rays and skates, plus their immediate fossil relatives). Appearing probably as early as the Late Devonian, hybodontiforms are characterized by a robust, shark-l...
Based on several field investigations, many molluscan shells and chondrichthyan teeth, together with other invertebrate and actinopterygian remains were found from the marine Bangkok Clay deposits in Ongkharak, Nakhon Nayok, at a depth of ~ 5–7 m below the topsoil surface. Animal macrofossils recovered from these Holocene marine deposits were ident...
The palaeoecology of the Xenacanthiformes (Chondrichthyes) is still a matter of discussion. Historically considered as freshwater organisms, hypotheses of euryhaline ecology including migratory behaviour were recently proposed based on the histology of their dorsal spines. However, recent studies still argued for a full freshwater ecology based on...
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...
The erection of Orthacanthus buxieri Heyler & Poplin from the lower Permian locality of Buxières-les-Mines (Allier, France) was based on a poorly prepared specimen with only a few parts of its anatomy visible. The supposedly related teeth have been regarded as possibly belonging to O. kounoviensis, a species already known from the Carboniferous–Per...
In 2019, a plaster (number PN 19-1) containing some indications of the presence of a hybodont shark was removed from Phu Noi Site, located in Kalasin Province and belonging to the Phu Kradung Formation. Because of the large size of the plaster (1.65 X 0.95 m), it has not yet been possible to CT-scan it, but careful manual preparation allowed showin...
The lacustrine ecosystem of the early Ladinian of Chang 7 Member of Yanchang Formation in the Ordos Basin (Shaanxi, North China) was proposed as the earliest known Mesozoic-type, trophically multileveled lacustrine ecosystem after the end-Permian mass extinction (EPME). However, the speculated top predator shark was a mere conjecture from coiled co...
The xenacanthid shark Orthacanthus was a major top predator of European freshwater ecosystems in the Late Palaeozoic (Carboniferous and Permian). It diversified in the Upper Carboniferous and almost completely disappeared in the transition from the Carboniferous to the Permian. Only a few representatives survived into the Lower Permian. However, th...
Four complete isolated neurocrania excavated during the nineteenth century in the Autun Basin (Sa^one-et-Loire, France) were used by Heyler & Poplin (1982) to erect two species: the symmoriiform Bibractopiscis niger and the xenacanthiform Orthacanthus commailli. However, the specimens have not been mechanically prepared and only a portion of their...
Les Xenacanthiformes (Chondrichthyes), apparus au Carbonifère inférieur en Europe, se sont rapidement répandus ensuite dans le monde. Ils atteignent leur maximum de diversité dans le Carbonifère terminal européen avant de rapidement décroître au cours du Permien inférieur. Comme pour de nombreux taxons fossiles, leur systématique et leur paléobiogé...
Chondrichthyans, or cartilaginous fishes, are represented by the sharks, rays, skates, and chimaeras. Many of them, like the eel-like Xenacanthiformes and their closest relative ‘Ctenacanthiformes’, or the odd-finned Symmoriiformes, are known only as fossils, so their evolutionary history is debated. Studies on the neurocranium (the part of the sku...
Les Xenacanthiformes sont un ordre de chondrichtyens, ou poissons cartilagineux. Ils sont apparus au Carbonifère inférieur en Europe et se sont rapidement répandus dans le monde. Leur diversité maximale est enregistrée autour de la transition Carbonifère-Permien en Europe. Ils étaient l'un des rares ordres de chondrichtyens à traverser l'extinction...
Nine shark teeth were collected at Arnager in the south-western part of the island of Bornholm (Baltic Sea, Denmark). They all come from the basal conglomerate of the Coniacian (Upper Cretaceous) Arnager Limestone Formation and belong to the genus Ptychodus Agassiz, 1834. Three different species are dentified: P. altior, P. latissimus and P. mammil...
A three-dimensional model enables the development of accurate solutions to have more information about the thickness, texture, and characteristics of small-size samples for education and metrology applications. This project proposes an idea to obtain a complete 3D surface reconstruction using the application of Pollen 3D for the scanning electron m...
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...
Xenacanthiformes forms an Order of elasmobranchs or stem-chondrichthyans known from the early Carboniferous to the upper Triassic. Their maximum diversity occurs around the Carboniferous-Permian boundary, notably in Europe.
In France, they are known since the 19th century in the Autun basin (Saône-et-Loire), particularly in the Muse oil-shale bed....
A detailed taxonomic study of a diverse chondrichthyan fauna from the Ladinian–Carnian (Middle–Late Triassic) interval at Nimaigu locality in Guizhou Province, South China is presented. Six taxa are described, two of which are assigned to Elasmobranchii incertae sedis (aff. Rosaodus sp., Rosaodus xingyiensis gen. et sp. nov.) and three to the Eusel...
The Late Jurassic marks a crucial time interval in the history of life leading to dramatic
episodes of global environmental perturbation at the Jurassic–Cretaceous boundary,
which significantly changed the faunal composition of many vertebrate communities in
both the terrestrial and marine realms. Among marine vertebrates, hybodontiform
shark-like...
Les chondrichtyens inclus aujourd’hui les requins, les raies et les chimères, mais ne sont que le pale reflet de leur diversité passée. Nombre d'entre eux, tels les Xenacanthiformes et leur proche parent les ‘Ctenacanthiformes’, ou encore les Symmoriiformes ne sont connus qu’à l’état fossile. La rareté de fossiles plus ou moins complets rend l’étud...
The Xenacanthiformes from Central and Eastern European deposits have been extensively studied, but the
systematics of the species from the French Carboniferous–Permian Autun Basin (Saône-et-Loire) remains debated.
Numerous xenacanthiform remains are still identified under the doubtful genus ‘Expleuracanthus’, and many of them
consist of isolated do...
Enameloid, the hyper-mineralized tissue covering shark teeth is a complex structure resulting from both ameloblast and odontoblast activity. The way these two types of cells interact to set up this tissue is not fully understood and results in the formation of subunits in the enameloid: the Single Crystallite Enameloid (SCE) and the Bundled Crystal...
We describe a large, nearly completely preserved sauropod humerus from the Lower Cretaceous Xinlong Formation of Napai Basin, Fusui County, Guangxi Zhuang Autonomous Region, southern China. It was excavated from the quarry that produced the holotypic specimen of the titanosauriform Fusuisaurus zhaoi. With a preserved length of 183.5 cm, the newly c...
The fossil wood genus Xenoxylon is reported in-situ for the first time in Thailand. It originates from the Indosinian terrane, from the Mesozoic continental redbeds of the Phu Kradung Formation (Khorat Group). Palinspatic reconstruction, palaeobiogeography and correlation with other occurrences of the genus, in southern China as well as in Vietnam,...
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 capt...
Cretaceous fish fossils are reported from Malaysia for the first time. They were found with dinosaur and turtle remains in nonmarine sediments in the interior of Pahang State, Peninsular Malaysia. This fish assemblage consists mostly of isolated teeth, with minor amounts of noncranial remains, including vertebral centra, scales, coprolites, and hyb...
In this paper, we report on a new Early Cretaceous vertebrate locality, Phu Din Daeng, in Nakhon Phanom Province, NE Thailand. The Phu Din Daeng site has yielded a diverse vertebrate assemblage, including sharks (Heteroptychodus steinmanni), bony fishes (Pycnodontiformes; Sinamiidae cf. Siamamia and ?Vidalamiinae, and Ginglymodi), adocid turtles, i...
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....
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....
The Moscovian of eastern North Greenland has yielded an assemblage dominated by teeth and dermal denticles of chondrichthyans with rarer teeth of actinopterygians. The rather poor preservation of the material precludes precise identification but the following taxa have been recorded: Adamantina foliacea, Bransonella spp., Denaea sp., “Stemmatias” s...
The fish-to-tetrapod transition-followed later by terrestrialization-represented a major step in vertebrate evolution that gave rise to a successful clade that today contains more than 30,000 tetrapod species. The early tetrapod Ichthyostega was discovered in 1929 in the Devonian Old Red Sandstone sediments of East Greenland (dated to approximately...
Les chondrichthyens possèdent des particularités anatomiques uniques chez les vertébrés actuels, en particulier un squelette entièrement cartilagineux et une dentition renouvelée en permanence. Ces caractéristiques rendent leur fossilisation difficile, et par conséquent leur registre fossile est principalement constitué d’un grand nombre de dents i...
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 under...
Lebanon is endowed with its outstanding preservation lagerstätten of fossil fish from the Upper Cretaceous. The batomorphs are represented by 16 species of Rajiformes belonging to 9 genera and 4 families however, their phylogeny remains poorly understood. Also, their diversity is possibly underestimated, compared to the great diversification event...
Chondrichthyans possess unique anatomical features compared to other vertebrates, in particular a fully cartilaginous skeleton and a permanently renewed dentition. These characteristics make the fossilization of whole bodies difficult and consequently their fossil record consists mainly of a large number of isolated teeth. The study of their dentit...
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 firs...
Remains of a coelacanth specimen are described from Rhaetian deposits of the Var Department, southeastern France. They comprise the lower part of a branchial apparatus associated with a left lower jaw and a basisphenoid. Osteological features of the angular and basisphenoid and the teeth ornamentation allow the inclusion of the specimen in the maws...
A short summary about the Mesozoic geology of Thailand meeting and the progress in Mesozoic fish research in the country.
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 r...
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...
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...
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 t...
The rather enigmatic genus Lagarodus is reported for the first time from the Bashkirian of Svalbard. Lagarodus first appeared in the equatorial region during the Tournaisian and then extended its geographical distribution to the intertropical zone around the Euramerican continent. The Svalbard discovery hints at the possibility that the northern sp...
The continental formations of Thailand have yielded abundant vertebrate remains, especially in the northeastern part of the country where they crop out along the edges of the Khorat plateau and the Phu Phan mountain range. The age of these fossil localities remains uncertain with estimations spanning a Late Jurassic-Early Cretaceous interval. Many...
The continental formations of Thailand have yielded abundant vertebrate remains, especially in the northeastern part of the country where they crop out along the edges of the Khorat plateau and the Phu Phan mountain range. The age of these fossil localities remains uncertain with estimations spanning a Late Jurassic – Early Cretaceous interval. Man...
The vertebrate assemblage from the Early Cretaceous non-marine Xinlong Formation of the Napai Basin, in the south-western part of Guangxi Zhuang Autonomous Region (southern China), is reviewed. The assemblage includes chondrichthyans (at least six species of hybodont sharks including
Hybodus, Thaiodus, Heteroptychodus
and
Acrorhizodus
), actinopter...
The breakup of Pangea and onset of growth of the Pacific plate led to several paleoenvironmental feedbacks, which radically affected paleoclimate and ocean chemistry during the Jurassic. Overall, this periodwas characterized by intense volcanic degassing from large igneous provinces and circum-Panthalassan arcs, new oceanic circulation patterns, an...
A fragmentary fossil found in the Barremian Sao Khua Formation of northeastern Thailand seems to fit the apical part of a sclerorhynchid rostral tooth. However, it appears different from all other known sclerorhynchid rostral teeth, and would likely represent a new genus, one of the oldest known. Despite intensive research conducted in the Sao Khua...
Enameloid is a hard mineralized tissue covering chondrichthyan and actinopterygian teeth. Over the past forty years, it has been extensively studied in various extinct and extant sharks, leading to the broad use of microstructural characters to differentiate between hybodont and neoselachian teeth. However, the chondrichthyan taxic diversity is dis...
Elasmobranch assemblages from the Eocene Lilleb ae lt Clay Formation (Late Ypresian to Middle Lutetian) at Trelde N ae s in Denmark yielded teeth of 31 different genera/species from surface collecting as well as from bulk sampling. The fauna is dominated by lamniform pelagic sharks and deep-water genera like Hexanchiformes, Centrophorus, Isistius,...
Elasmobranchs are reported for the first time from Lower Triassic deposits in Oman. The well-preserved remains consist of isolated teeth, dermal denticles and fin spines, recovered from conodont residues. The low-palaeolatitude sections consist of Lopingian–Olenekian shallow and pelagic carbonates in exotics, olistoliths and breccia blocks that hav...
The discovery of a tooth of cf. Pseudonotidanus sp. is reported from the Bathonian of Normandy. Its morphology supports the transfer of the species terencei from the genus Welcommia to the genus Pseudonotidanus. It also supports the idea that Pseudonotidanidae might be basal Hexanchiformes rather than Synechodontiformes. RÉSUMÉ La découverte d'une...
The palaeontological content (charophytes and vertebrates) of organic-rich layers from the Middle Jurassic (Bathonian) of the Grands Causses at Mostuéjouls (Aveyron, France) has been examined. It is rich in gyrogonites of Porochara douzensis. The vertebrates of the lower layer include a single hybodontiform tooth, “semionotiform” teeth and scales,...
The breakup of Pangea and onset of growth of the Pacific plate led to several paleoenvironmental feedbacks, which radically affected paleoclimate and ocean chemistry during the Jurassic. Overall, this period was characterized by intense volcanic degassing from large igneous provinces and circum-Panthalassan arcs, new oceanic circulation patterns, a...
A set of associated vertebrae and teeth of a fossil shark was collected from the lower Lutetian
(Middle Eocene) part of the Lillebælt Clay Formation in Denmark. Its vertebral morphology indicates
that the individual belongs to an odontaspidid lamniform shark. Although it is here identified as
Odontaspididae indet., its tooth morphology suggests tha...
A revision of the freshwater shark fauna from the Phu Kradung Formation in NE Thailand allows the recognition of a new species of Acrodus, which represents the youngest occurrence of the genus and confirms its displacement in freshwater environments after the Toarcian. The rest of the shark fauna includes teeth of Hybodus sp., aff. Hybodus sp., hyb...
Chondrichthyans are newly reported from the autochthonous Wordian Khuff Formation (middle Permian), cropping out in well-exposed, low-palaeolatitude sections in the interior Haushi-Huqf area of Oman. The shark remains comprise isolated teeth, dermal denticles and fin spines and have been recovered by processing limestone in buffered acetic acid fro...
A new fossiliferous locality from the Middle Jurassic (Bathonian) of the Grands Causses (Gard, France) is described. The layer is rich in gyrogonites of Porochara douzensis. The only ostracod carapace found is identified as Darwinula magna. As for vertebrates, teeth of Hybodontiformes, teeth and scales of Semionotiformes, and one fragmentary tooth...
The earliest record of Palaeophis ever found in Denmark is here based on vertebrae described from the Paleocene/Eocene Stolleklint Clay of the Isle of Mors
(northern Denmark). Although much smaller, they appear quite similar to the Eocene vertebra described from the Fur Formation
in the same area, and all belong to the ‘primitive’ grade of Palaeoph...
. Sixteen different Lower Carboniferous (Tournaisian Courceyan to Chadian age, Mississippian) chondrichthyan teeth types have been extracted from Triassic erosional/aeolian fills in shallow karst systems found in the limestone quarry at Cromhall, Gloucestershire, England. These Carboniferous teeth have been found within a much larger assemblage of...
This study identifies three new neoselachian tooth taxa from the Middle and Upper Triassic. On the basis of morphological and histological characters, Rhomaleodus budurovi, nov. gen. et sp. (Anisian of Bulgaria), is resolved as stem selachimorph, with an additional specimen from the same stratigraphic level assigned to Synechodus sp. Selachimorph g...
We describe a partial crocodilian skull from the Mesozoic non-marine sediments of the Khorat Plateau Sao Khua Formation (Berriasian-Barremian) in northeastern Thailand and assign it to Theriosuchus grandinaris sp. nov. An isolated dentary from the Phu Kradung Formation (latest Jurassic–Early Cretaceous) is also tentatively assigned to the genus The...
Microremains of various sharks, actinopterygians and crocodiles have been recovered from two sites in the Douiret Formation and three sites in the Aïn el Guettar Formation in southern Tunisia. The presence of an actinistian is also suggested based on histological study of hemisegments of lepidotrichia. Convergence in dental enameloid microstructure...
The Mesozoic vertebrate fauna from Kut Island includes hybodont sharks (Hybodus sp., Isanodus paladeji, a new species of Heteroptychodus), actinopterygians (Semionotiformes indet., Lepidotes sp.), indeterminate turtles, goniopholidid crocodiles, cf. Theriosuchus sp. and theropod dinosaurs. The new hybodont species is also present in the Sao Khua Fo...
Warm-Blooded Reptiles?
Existing reptiles are not thought to be endothermic, but what about extinct species? Three large extinct swimming reptiles, the ichthyosaurs, plesiosaurs, and mosasaurs, were active predators in the Mesozoic oceans. Bernard et al. (p. 1379 ; see the Perspective by Motani ) investigated their metabolism by analyzing the oxygen...
Fossil wood specimens from the late Early–early Middle Jurassic of Jameson Land, Eastern Greenland, have several unexpected
features: tracheids of irregular size and shape, thinly pitted ray cell walls, heterogeneous rays, partially scalariform radial
pitting, both areolate and simple pits, and pitted elements associated with rays. These characters...
