146 research outputs found
A mandible of the hyracoid mammal Titanohyrax andrewsi in the collections of the Muséum National d'Histoire Naturelle, Paris (France) with a reassessment of the species
International audienceAn unpublished mandible of the large hyracoid Titanohyrax andrewsi from the early Oligocene Jebel Qatrani Formation, Fayum Depression, Egypt is described. This specimen has a twofold importance. Firstly, it opens an unexpected window on early paleontological research in the Fayum because it was discovered as early as 1904 by the French paleontologist RenĂ© Fourtau during an expedition to the Fayum organized by the MusĂ©um National dâHistoire Naturelle, Paris (MNHN). This expedition has remarkably never been mentioned in the literature. Secondly, the mandible documents the best-preserved specimen of T. andrewsi, permitting a revision of one of the very rare Paleogene hyracoids. Interestingly, the new mandible was discovered two years before the first report of the species by Charles W. Andrews. The hypodigm of T. andrewsi is reviewed and the dentition as a whole is compared indetail, notably with other Titanohyrax species from the Fayum. The validity of the large Titanohyrax âschlosseriâ species is discussed, but a pronounced sexual size dimorphism for T. andrewsi is favoured
New remains of Chambius kasserinensis from the Eocene of Tunisia and evaluation of proposed affinities for Macroscelidea (Mammalia, Afrotheria)
International audienceChambius kasserinensis from the late Early or early Middle Eocene Chambi locality, central Tunisia, is undoubtedly the oldest known macroscelidid and possibly the basalmost representative of the order Macroscelidea. Hence, since its discovery in 1986, Chambius has played a key role in analyses focusing on afrotherian and eutherian phylogeny; for instance, as early as 1995, Butlerâs review of fossil macroscelideans highlighted the central position of Chambius in the origin of the order. Despite this, Chambius remained poorly known until recently. Here based on new mandibular fragments, well-preserved upper molars and CT scan analysis of the holotype maxilla, Chambius is revised. Its dentition is first described in detail, providing a precise characterization of the genus. Chambius is notably defined by a submolariform P4 with a three-cusped talonid, a reduced talonid on M2, and a prominent metaconule on M1â2. Interestingly, the two transverse lophs of the upper molars are basically formed by preconulecristae, evoking the recently defined peculiar bilophodonty of paenungulates. Comparisons with other Paleogene and modern macroscelidids, European Louisinidae, and North American Apheliscidae are also made, allowing the various hypotheses about the origin and early evolution of macroscelidids to be reviewed
3D model related to the publication: Filling a gap in the proboscidean fossil record: a new genus from the Lutetian of Senegal
International audienc
De l'ombre aux LumiÚres et réciproquement : redécouverte du crùne de Procavia capensis (Pallas, 1766) (Hyracoidea, Mammalia) décrit en 1767 par Daubenton dans l' Histoire naturelle
International audienc
MammifÚres du paléogÚne ancien d'Afrique du Nord occidentale (systématique, paléobiographie et apport à la phylogénie des "ordres endémiques africains")
MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF
RĂ©vision des faunes de mammifĂšres de la fin de lâĂocĂšne infĂ©rieur de Mas de Gimel et de Naples (Montpellier, sud de la France) et description dâun nouveau rongeur thĂ©ridomorphe
Les sites europĂ©ens ayant livrĂ© des mammifĂšres terrestres datĂ©s de la fin de lâYprĂ©sien sont principalement localisĂ©s dans le Bassin de Paris. En Europe mĂ©ridionale (France et Espagne), quelques localitĂ©s sont Ă©galement connues, mais toutes nâont livrĂ© que des faunes pauvres, composĂ©es de seulement quelques taxons, Ă lâexception de la localitĂ© de Mas de Gimel (ville de Montpellier, HĂ©rault, France), longtemps considĂ©rĂ©e comme la faune de rĂ©fĂ©rence de la fin de lâYprĂ©sien en Europe mĂ©ridionale. Curieusement, seuls les rongeurs, les artiodactyles et les mĂ©tathĂ©riens de cette localitĂ©-clĂ© ont Ă©tĂ© Ă©tudiĂ©s en dĂ©tail depuis les annĂ©es 1960. Sur la base de la collection originale conservĂ©e Ă lâUniversitĂ© de Montpellier, nous rĂ©visons lâensemble des taxons de mammifĂšres, ce qui nous amĂšne Ă identifier 38 espĂšces parmi 12 ordres. Nous Ă©tudions Ă©galement les localitĂ©s voisines et contemporaines de Naples et Naples 2, oĂč nous identifions 23 espĂšces parmi 10 ordres. Parmi les espĂšces identifiĂ©es dans les trois localitĂ©s, nous dĂ©crivons le nouveau rongeur thĂ©ridomorphe Hartenbergeromys pailladensis n. sp., caractĂ©risĂ© par de nombreuses crĂȘtes fines et hautes sur les molaires supĂ©rieures et infĂ©rieures. ComparĂ© aux quatre niveaux de rĂ©fĂ©rence MP (Mammal Paleogene) pour lâĂocĂšne infĂ©rieur europĂ©en (MP7, MP8+9, MP10a et le possible âMP10bâ), lâassemblage faunique de Mas de Gimel et de Naples est attribuĂ© au MP10a, et reprĂ©sente une rĂ©fĂ©rence europĂ©enne majeure pour cette pĂ©riode. Ce travail renforce lâhypothĂšse de lâhomogĂ©nĂ©itĂ© des faunes mammaliennes du Nord- et du Sud-Ouest europĂ©en durant lâYprĂ©sien rĂ©cent.European terrestrial mammal sites dated from the late Ypresian are predominantly known from the Paris Basin. In Southern Europe (France and Spain), some localities are also known, but all have only yielded small faunas, composed by few taxa. An exception is the rich locality of Mas de Gimel (city of Montpellier, HĂ©rault, France), which has long been considered the reference fauna of the late Ypresian in Southern Europe. Curiously however, only the rodents, artiodactyls and metatherians from this key locality have been studied in detail since the 1960s. Here, based on the original collection housed in the University of Montpellier, we revise the entire mammal taxa, which leads us to identify 38 species among 12 orders. We also study the close and co-eval localities of Naples and Naples 2, where we identify 23 species among 10 orders. Among the species identified from the three localities, we describe the new theridomorph rodent Hartenbergeromys pailladensis n. sp., characterized by numerous thin high extra ridges on upper and lower molars. Compared with the four standard MP (Mammal Paleogene) reference-levels for the European Early Eocene (MP7, MP8+9, MP10a, and the putative âMP10bâ), the faunal assemblage from Mas de Gimel and Naples is attributed to the MP10a, representing a major European reference for this period. This study also supports the idea that, during the late Ypresian, the mammal faunas from North- and Southwestern Europe are quite homogeneous.</p
A mandible of Diacodexis cf. gigasei (Artiodactyla, Diacodexeidae) from the Early Eocene locality of Palette (Bouches-du-RhĂŽne, France)
International audienceThis note presents the 3D model of the hemi-mandible UM-PAT 159 of the MP7 Diacodexis species D. cf. gigasei and 3D models corresponding to the restoration of the ascending ramus, broken on the original specimen, and to a restoration of a complete mandible based on the preserved left hemi-mandible
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