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Koen Stein
Vrije Universiteit Brussel
24Publications
9H-index
396Citations
Publications 24
Newest
#1Koen Stein (Vrije Universiteit Brussel)H-Index: 9
#2Edina Prondvai (UGent: Ghent University)H-Index: 8
Last.Robert R. Reisz (NCHU: National Chung Hsing University)H-Index: 36
view all 6 authors...
One of the fossil record’s most puzzling features is the absence of preserved eggs or eggshell for the first third of the known 315 million year history of amniote evolution. Our meagre understanding of the origin and evolution of calcareous eggshell and amniotic eggs in general, is largely based on Middle Jurassic to Late Cretaceous fossils. For dinosaurs, the most parsimonious inference yields a thick, hard shelled egg, so richly represented in the Late Cretaceous fossil record. Here, we show ...
#1Jasmina Wiemann (Yale University)H-Index: 3
#2Matteo Fabbri (Yale University)H-Index: 5
Last.Derek E. G. Briggs (Yale University)H-Index: 62
view all 7 authors...
Vertebrate hard tissues consist of mineral crystallites within a proteinaceous scaffold that normally degrades post-mortem. Here we show, however, that decalcification of Mesozoic hard tissues preserved in oxidative settings releases brownish stained extracellular matrix, cells, blood vessels, and nerve projections. Raman Microspectroscopy shows that these fossil soft tissues are a product of diagenetic transformation to Advanced Glycoxidation and Lipoxidation End Products, a class of N-heterocy...
#1Verónica Díez Díaz (Humboldt University of Berlin)H-Index: 1
#2Géraldine Garcia (University of Poitiers)H-Index: 16
Last.Xavier Valentin (University of Poitiers)H-Index: 14
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Abstract New remains of the titanosaurian sauropod Atsinganosaurus velauciensis from its Upper Cretaceous type horizon and type locality in Velaux-La Bastide Neuve (Bouches-du-Rhone Department, Provence) in southern France are described. This locality is considered to be upper Campanian (Argiles et Gres a Reptiles Formation, Aix-en-Provence Basin). The new material consists of skull fragments, including a partial braincase, isolated teeth, elements of the axial skeleton (cervical, dorsal and cau...
#1Benjamin Jentgen (University of Liège)
#2Koen Stein (Vrije Universiteit Brussel)H-Index: 9
Last.Valentin Fischer (University of Liège)H-Index: 14
view all 6 authors...
#1Pascal Godefroit (Royal Belgian Institute of Natural Sciences)H-Index: 20
#2Géraldine Garcia (University of Poitiers)H-Index: 16
Last.Xavier Valentin (University of Poitiers)H-Index: 14
view all 7 authors...
Rhabdodontidae is a successful clade of ornithopod dinosaurs, characteristic of Late Cretaceous continental faunas in Europe. A new rhabdodontid from the late Campanian, of southern France, Matheronodon provincialis gen. et sp. nov., is characterized by the extreme enlargement of both its maxillary and dentary teeth, correlated to a drastic reduction in the number of maxillary teeth (4 per generation in MMS/VBN-02-102). The interalveolar septa on the maxilla are alternately present or resorbed v...
#1Andrea CauH-Index: 14
#2Vincent BeyrandH-Index: 2
Last.Pascal GodefroitH-Index: 20
view all 10 authors...
The recently discovered theropod Halszkaraptor escuillei reveals a novel basal dromaeosaurid clade, and its adaptations that suggest a semi-aquatic predatory lifestyle add an additional ecomorphology to those developed by non-avian maniraptorans.
#1Jessica Mitchell (University of Bonn)H-Index: 3
#2P Martinsander (University of Bonn)H-Index: 32
Last.Koen Stein (Royal Belgian Institute of Natural Sciences)H-Index: 9
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Sauropod bone histology has provided a great deal of insight into the life history of these enormous animals. However, because of high growth rates, annual growth rings are not common in sauropod long bones, so directly measuring growth rates and determining sexual maturity require alternative measures. Histological ontogenetic stages (HOS) have been established to describe the changes in bone histology through development for basal Macronaria and Diplodocoidea, and subsequently for Titanosauria...
#1Edina Prondvai (UGent: Ghent University)H-Index: 8
#2Gábor Botfalvai (ELTE: Eötvös Loránd University)H-Index: 5
Last.Attila Ősi (MTA: Hungarian Academy of Sciences)H-Index: 16
view all 5 authors...
As a result of several years of screen-washing activity, a remarkable assemblage of eggshell fragments has been recovered from the Late Cretaceous vertebrate locality of Iharkut, Hungary. Detailed investigation of the assemblage by multiple visualization techniques (scanning electron microscopy, polarizing light microscopy, X-ray micro-computed tomography), quantitative morphometric analyses, and micro X-ray fluorescence spectrometry revealed a diverse composition of five different eggshell morp...
#1Benjamin Jentgen (University of Liège)
#2Koen Stein (Vrije Universiteit Brussel)H-Index: 9
Last.Valentin Fischer (University of Liège)H-Index: 14
view all 3 authors...
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