Nicole Klein, Alexandra Houssaye, James M. Neenan, Torsten M. Scheyer,
Placodontia, an enigmatic group of durophagous and in part heavily armoured animals, were members of Sauropterygia, the ... long bones of several armoured and non-armoured Placodontia were studied, covering most of their taxonomic breadth, ... cavity and a perimedullary region. Armoured Henodus and Placodontia indet. aff. Cyamodus as well as non-armoured ... radiating fibro-lamellar bone. Several long bones of Placodontia indet. show circumferential fibro-lamellar bone and can ... The highly vascularized fibro-lamellar bone of these Placodontia indicates growth rates comparable to that of open ...
Tópico(s): Amphibian and Reptile Biology
2015 - Naturalis Biodiversity Center | Contributions to Zoology
Nicole Klein, James M. Neenan, Torsten M. Scheyer, Eva Maria Griebeler,
Placodontia is a clade of durophagous, near shore marine reptiles from Triassic sediments of modern-day Europe, ... and life-history strategies between different taxa of Placodontia. Psephoderma and Paraplacodus grew with lamellar-zonal bone ... show growth patterns as seen in modern reptiles. Placodontia indet. aff. Cyamodus and some Placodontia indet. show a unique combination of fibrolamellar bone ... in modern sauropsids. The bone tissue type of Placodontia indet. aff. Cyamodus and Placodontia indet. indicates a ...
Tópico(s): Ichthyology and Marine Biology
2015 - Royal Society | Royal Society Open Science
Olivier Rieppel, Robert T. Zanon,
Five terminal taxa (at the generic level) of Placodontia are recognized; the status of Psephosaurus remains problematical. A cladistic analysis of the interrelationships of Placodontia, based on 30 characters, results in two equally parsimonious trees. The Placodontia comprise two major subclades, the Placodontoidea and the ...
Tópico(s): Genomics and Phylogenetic Studies
1997 - Taylor & Francis | Historical Biology
... shows a number of features that link the Placodontia to the Diapsida. A large quadratojugal forms much ... evidence exists to support a close relationship between Placodontia and Sauropterygia or between Placodontia and Ichthyopterygia.
Tópico(s): Morphological variations and asymmetry
1987 - Taylor & Francis | Journal of Vertebrate Paleontology
James M. Neenan, Chun Li, Olivier Rieppel, Torsten M. Scheyer,
... between the matrices; however, both support a monophyletic Placodontia with eastern taxa interspaced throughout, indicating no major ... is strong for a western Tethyan origin of Placodontia, although the highly nested Placochelyidae first appear in ...
Tópico(s): Ichthyology and Marine Biology
2015 - Oxford University Press | Zoological Journal of the Linnean Society
... et l'anatomie palatine des genres valides de Placodontia (Reptilia, Trias) sont decrites. Cette analyse conduit a ... reptilienne generalisee. Une phylogenie et une systematique des Placodontia, essentiellement basee sur ces caracteres dentaires et palatins, ...
Tópico(s): Paleontology and Evolutionary Biology
1989 - Elsevier BV | Geobios
Wei Wang, Chun Li, Xiao‐Chun Wu,
Cyamodontoidea is an armoured lineage of Placodontia, the basal-most clade of Sauropterygia. It was unknown in China until Sinocyamodus xinpuensis was reported in 2000, on the basis of ...
Tópico(s): Paleontology and Evolutionary Biology
2018 - Oxford University Press | Zoological Journal of the Linnean Society
Stephanie Crofts, James M. Neenan, Torsten M. Scheyer, Adam P. Summers,
Abstract Placodontia were a group of marine reptiles that lived in shallow nearshore environments during the Triassic. Based on ...
Tópico(s): Ichthyology and Marine Biology
2016 - Cambridge University Press | Paleobiology
James M. Neenan, Nicole Klein, Torsten M. Scheyer,
... thus indicating a western Tethyan (European) origin for Placodontia, the most basal group of sauropterygians. A single ...
Tópico(s): Evolution and Paleontology Studies
2013 - Nature Portfolio | Nature Communications
Abstract Placodontia (Reptilia: Sauropterygia) is a group of enigmatic armored marine reptiles restricted to the Triassic time period. Only ...
Tópico(s): Turtle Biology and Conservation
2007 - Wiley | Journal of Anatomy
Yannick Pommery, Torsten M. Scheyer, James M. Neenan, Tobias Reich, Vincent Fernández, Dennis F. A. E. Voeten, Adrian Losko, Ingmar Werneburg,
Abstract Background Placodontia is a Triassic sauropterygian reptile group characterized by flat and enlarged crushing teeth adapted to a durophagous diet. ...
Tópico(s): Morphological variations and asymmetry
2021 - BioMed Central | BMC Ecology and Evolution
Andrzej S. Wolniewicz, Yuefeng Shen, Qiang Li, Yuanyuan Sun, Yu Qiao, Yajie Chen, Yiwei Hu, Jun Liu,
... markedly different body plans - the short-necked, durophagous Placodontia and the long-necked Eosauropterygia - whereas Saurosphargidae, a ...
Tópico(s): Evolution and Paleontology Studies
2023 - eLife Sciences Publications Ltd | eLife
Ryosuke Motani, Geerat J. Vermeij,
... while five other clades reached Step M4: Saurosphargidae, Placodontia, Dinocephalosaurus , Desmostylia, and Odontochelys . Clades reaching Steps M4 ...
Tópico(s): Turtle Biology and Conservation
2021 - Wiley | Biological reviews/Biological reviews of the Cambridge Philosophical Society
Wei Wang, Chun Li, Torsten M. Scheyer, Li-Jun Zhao,
The Triassic eastern Tethyan faunas have continued to yield numerous specimens of marine reptile taxa in recent years. Nevertheless, compared with other sauropterygian clades, the diversity of placodonts in these faunas is low, and remains of this group are relatively rare in the fossil assemblages. Here, we report a new cyamodontoid specimen (ZMNH M8820) from the early Late Triassic of Guizhou, south-west China. This specimen is a nearly complete skeleton lacking only the forelimbs. It is distinct ...
Tópico(s): Ichthyology and Marine Biology
2019 - Taylor & Francis | Journal of Systematic Palaeontology
Abstract Placodonts are a group of turtle‐like animals, including placochelyids that are restricted entirely to the Triassic Tethyan realm. Their fossil remains are rare compared with other contemporaneous marine reptiles. Here, we report the first subadult specimen of the placochelyid Psephochelys polyosteoderma from south‐western China. It is the most complete specimen of this taxon known. The new fossil is referred confidently to Psephochelys polyosteoderma on the basis of the narrow and spatulate ...
Tópico(s): Ichthyology and Marine Biology
2019 - Wiley | Papers in Palaeontology
Carlos de Miguel Chaves, Francisco Ortega, Adán Pérez‐García,
... adaptations relative to all the other members of Placodontia. It has been exclusively found in the Carnian ( ...
Tópico(s): Paleontology and Stratigraphy of Fossils
2018 - Wiley | Papers in Palaeontology
James M. Neenan, Tobias Reich, Serjoscha Evers, Patrick S. Druckenmiller, Dennis F. A. E. Voeten, Jonah N. Choiniere, Paul M. Barrett, Stephanie E. Pierce, Roger Benson,
... T.M. Long bone histology and microanatomy of Placodontia (Diapsida: Sauropterygia).Contrib. Zool. 2015; 84: 59-84Google ...
Tópico(s): Evolution and Paleontology Studies
2017 - Elsevier BV | Current Biology
James M. Neenan, Torsten M. Scheyer,
Psephoderma alpinum is an armoured, durophagous placodont known from the alpine Late Triassic. Here we present a new, well-preserved isolated skull discovered in the Alplihorn Member (Late Norian–Early Rhaetian) of the Kössen Formation, Schesaplana Mountain, which straddles the Swiss/Austrian border. Micro-computed tomographic (µCT) scanning was used to create an accurate osteological reconstruction of the specimen, the first time this has been conducted for Psephoderma. We thus clarify disputed anatomical ...
Tópico(s): Morphological variations and asymmetry
2014 - Springer Nature | Swiss Journal of Geosciences
Torsten M. Scheyer, James M. Neenan, Silvio Renesto, Franco Saller, Hans Hagdorn, Heinz Furrer, Olivier Rieppel, Andrea Tintori,
... overview) focussing on the European members of the Placodontia (Reptilia: Sauropterygia), a diverse group of enigmatic marine ...
Tópico(s): Evolution and Paleontology Studies
2012 - Taylor & Francis | Historical Biology
James M. Neenan, Torsten M. Scheyer,
ABSTRACT Placodus gigas is an unarmored placodont marine reptile (Diapsida, Sauropterygia) known from the Middle Triassic of Europe, most commonly found in the shallow marine carbonate facies of the German Muschelkalk (lower Anisian to middle Ladinian, approximately 243–235 Ma). Generally, the morphology of the skull is well understood, with the exception of the braincase, which is partially obscured by dermatocranial bone. Two skulls that display well-preserved and intact chondrocranial elements ...
Tópico(s): Evolution and Paleontology Studies
2012 - Taylor & Francis | Journal of Vertebrate Paleontology
Torsten M. Scheyer, James M. Neenan, Silvio Renesto, Franco Saller, Hans Hagdorn, Heinz Furrer, Olivier Rieppel, Andrea Tintori,
... overview) focussing on the European members of the Placodontia (Reptilia: Sauropterygia), a diverse group of enigmatic marine ...
Tópico(s): Ichthyology and Marine Biology
2011 - Taylor & Francis | Historical Biology
... kuhnschnyderi n. sp. novelle espèce de Cyamodontidae (Reptilia, Placodontia) du Muschelkalk supérieur allemande. Compt Rend Acad Sci ...
Tópico(s): Turtle Biology and Conservation
2011 - Taylor & Francis | Historical Biology
D. Jiang, Ryosuke Motani, Wei-Cheng Hao, Olivier Rieppel, Yuanlin Sun, Lars Schmitz, Zuo-Yu Sun,
Tópico(s): Morphological variations and asymmetry
2008 - Taylor & Francis | Journal of Vertebrate Paleontology
The skeletal anatomy of Paraplacodus broilii Peyer from the Grenzbitumen-horizon (Anisian-Ladinian boundary) of Monte San Giorgio (Switzerland) is described and compared with that of other placodonts. Paraplacodus is found to share a number of potential synapomorphies with Placodus which could potentially corroborate the monophyly of the Placodontoidea, but Placodus also shares an number of potential synapomorphies with the armored placodonts (Cyamodontoidea) which are absent in Paraplacodus. Parsimony ...
Tópico(s): Amphibian and Reptile Biology
2000 - Oxford University Press | Zoological Journal of the Linnean Society
The skeletal anatomy of Paraplacodus broilii Peyer from the Grenzbitumen-horizon (Anisian-Ladinian boundary) of Monte San Giorgio (Switzerland) is described and compared with that of other placodonts. Paraplacodus is found to share a number of potential synapomorphies with Placodus which could potentially corroborate the monophyly of the Placodontoidea, but Placodus also shares an number of potential synapomorphies with the armored placodonts (Cyamodontoidea) which are absent in Paraplacodus. Parsimony ...
Tópico(s): Amphibian and Reptile Biology
2000 - Oxford University Press | Zoological Journal of the Linnean Society
Wolf‐Ernst Reif, Friederike Stein,
Tópico(s): Ichthyology and Marine Biology
1999 - E. Schweizerbart | Neues Jahrbuch für Geologie und Paläontologie - Monatshefte
... of all other Sauropterygia. The Sauropterygia and the Placodontia together form a monophyletic group, the Euryapsida, which ...
Tópico(s): Ichthyology and Marine Biology
1989 - Royal Society | Philosophical transactions of the Royal Society of London. Series B, Biological sciences
... Deuterosauria, exhibiting a strong affinity with both the Placodontia and Theriodontia. In 1892, when describing the lamellibranchiate ...
Tópico(s): Fossil Insects in Amber
1895 - Geological Society of London | Quarterly Journal of the Geological Society
Mélani Berrocal-Casero, Julia Audije Gil, Rui Castanhinha, Juan Valera, Vanda Faria dos Santos, Manuel Segura,
... a multitude of anatomical elements of Sauropterygia (Nothosauroidea, Placodontia) and possible Archosauria (Rauisuchia) remains. The fossil material ...
Tópico(s): Ichthyology and Marine Biology
2018 - Elsevier BV | Proceedings of the Geologists Association
The osteology of the temporal region of placodonts is re-investigated. The elements identified as quadrates by previous descriptions of the basal taxa Palatodonta bleekeri and Paraplacodus broilii are re-interpreted to represent entirely or in part the quadratojugal. A new interpretation and reconstruction of the best preserved skull of Paraplacodus broilii is presented. In Placodus, the squamosal and quadratojugal are fused into a compound bone, as proposed by some previous authors. The structure ...
Tópico(s): Evolution and Paleontology Studies
2020 - State Museum of Natural History Stuttgart | Palaeodiversity