Reference : Comparative histology of dwarf titanosaurians from the Late Cretaceous of France
Scientific congresses and symposiums : Unpublished conference/Abstract
Life sciences : Anatomy (cytology, histology, embryology...) & physiology
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Comparative histology of dwarf titanosaurians from the Late Cretaceous of France
[fr] Histologie comparée de titanosauriens nains du Crétacé supérieur de France
Jentgen, Benjamin mailto [Université de Liège - ULiège > Département de géologie > Géologie de l'environnement >]
Stein, Koen [Université de Liège - ULiège > Département de géologie > Evolution and diversity dynamics lab >]
Díez Díaz, Verónica [Leibniz-Institut für Evolutions-und Biodiversitätsforschung > > > >]
Garcia, Géraldine [Université de Poitiers > > > >]
Fischer, Valentin mailto [Université de Liège - ULiège > Département de géologie > Evolution and diversity dynamics lab >]
Valentin, Xavier [Palaios Association > > > >]
1st Palaeontological Virtual Meeting
Du 1er au 15 décembre 2018
[en] insular dwarfism ; Titanosauria ; Atsinganosaurus velauciensis ; bone histology
[en] The derived sauropod clade Titanosaurs encompasses the largest land animals that ever roamed the Earth as well as dwarfed species that evolved in restricted, insular habitats. Here, we report on the long bone histology (humeri and femora) of several mature individuals belonging to a new, small-sized titanosaur from the Upper Cretaceous of Velaux – La Bastide Neuve (Provence, France).
The main osteohistological feature of the new titanosaur is the heavy remodelling of the cortex, from the outermost cortex retaining some primary vascular canals with traces of External Fundamental System onsets (F to G bone tissue types) to the complete remodelling of the cortex (H bone tissue type). Histological Ontogenetic Stages (HOS) of the samples range from HOS 12 to 14, meaning these bones belong to mature close to or at final body size. Overall long bone histology of the new taxon is strikingly similar to that Atsinganosaurus velauciensis, another titanosaur from the same site and time period.
A mature osteohistology combined with femora and humeri that are markedly reduced in size compared to more basal macronarians indicates an earlier onset of the remodelling process during ontogeny at a rate that surpassed the apposition one. Insular dwarfism is a consistent hypothesis for this combination of features, raising the number of dwarfed titanosaurs lineages in the European archipelago.
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
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