Xavier Valentin

Publications59
h-index18
Citations1,931
Highly Influential Citations120
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A new hominid from the Upper Miocene of Chad, Central Africa
TLDR
The discovery of six hominid specimens from Chad, central Africa, 2,500 km from the East African Rift Valley, suggest that the earliest members of the hominids clade were more widely distributed than has been thought, and that the divergence between the human and chimpanzee lineages was earlier than indicated by most molecular studies.
Oldest cingulate skulls provide congruence between morphological and molecular scenarios of armadillo evolution
TLDR
These skulls document an early spotty occurrence for the Tolypeutinae at 26 Ma, in agreement with the temporal predictions of previous molecular studies, and Kuntinaru boliviensis is the oldest confident calibration point available for the whole Cingulata.
New rodent assemblages from the Eocene Dur At‐Talah escarpment (Sahara of central Libya): systematic, biochronological, and palaeobiogeographical implications
TLDR
The new rodent assemblages suggest a late middle Eocene age for the Idam ('Bioturhated) deposits of the Dur At-Talah escarpment, and it is clear that haluchimyines and phiomyids have a common ancestry, and that dispersal occurred between Asia and Africa during the middle of the Palaeogene.
An Early Campanian vertebrate fauna from the Villeveyrac Basin (Hérault, Southern France)
New Hystricognathous Rodents from the Early Oligocene of Central Libya (Zallah Oasis, Sahara Desert): Systematic, Phylogenetic, and Biochronologic Implications
TLDR
The Zallah assemblage of Oligocene hystricognathous rodents considerably improves the authors' knowledge of the evolutionary history of African rodents and positioning the Zallah fauna within a consistent chronological framework constitutes an important advance toward the goal of achieving a comprehensive network correlating Paleogene Afro-Arabian mammal localities.
New specimens of Allodaposuchus precedens from France: intraspecific variability and the diversity of European Late Cretaceous eusuchians
TLDR
The results allow the diversity of Late Cretaceous eusuchians from Europe to be refined and recognize a basal stock known as the Hylaeochampsidae sharing an absence of external mandibular fenestrae.
A new Titanosaur genus (Dinosauria, Sauropoda) from the Late Cretaceous of southern France and its paleobiogeographic implications
Key-words. - Sauropoda, Titanosauria, Upper Cretaceous, Southern France, Paleobiogeography. Abstract .-An ewtitanosaur, Atsinganosaurus velauciensis, gen. and sp. nov. is described from…
Gaudeamus lavocati sp. nov. (Rodentia, Hystricognathi) from the early Oligocene of Zallah, Libya: first African caviomorph?
A new African species of hystricognathous rodent, Gaudeamus lavocati sp. nov., is described herein from the early Oligocene deposits of Zallah locality (Sirt basin, Central Libya). The dental…
New Apterodontinae (Hyaenodontida) from the Eocene Locality of Dur At-Talah (Libya): Systematic, Paleoecological and Phylogenetical Implications
TLDR
First cladistic analysis of hyaenodontidans including apterodontines is performed: Apterodon and Quasiapterodon appear close relatives to “hyainailourines”, in particular to the African Oligo-Miocene Metasinopa species.
Late middle Eocene epoch of Libya yields earliest known radiation of African anthropoids
TLDR
The discovery of the oldest known diverse assemblage of African anthropoids from the late middle Eocene Dur At-Talah escarpment in central Libya indicates either a much longer interval of anthropoid evolution in Africa than is currently documented in the fossil record or the nearly synchronous colonization of Africa by multiple anthropoid clades at some time during themiddle Eocene epoch.
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