62 research outputs found
mammiferes de l'Ilerdien moyen (Eocene inferieur) des Corbieres et du Minervois (Bas-lLanguedoc, France). Systematique, Biostratigraphie, Correlations
SIGLEINIST T 71574 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc
SystĂ©matique et palĂ©obiologie du primate anthropoĂŻde <i>Pondaungia</i> de l'ĂocĂšne moyen supĂ©rieur du Myanmar
Plusieurs nouveaux spĂ©cimens documentant les anthropoĂŻdes du Myanmar (Asie du Sud-Est) Pondaungia et Amphipithecus modifient sensiblement l\u27interprĂ©tation taxonomique classique de ces deux taxons, qui ne prĂ©sentent pas de diffĂ©rences morphologiques. En utilisant le degrĂ© d\u27usure des dents et la hauteur de la mandibule sous le foramen mentale, nous montrons une variabilitĂ© continue attribuĂ©e Ă des diffĂ©rences d\u27Ăąge entre les individus. De plus, un fort dimorphisme sexuel est mis en Ă©vidence. Nous interprĂ©tons donc l\u27holotype de Amphipithecus mogaungensis comme un mĂąle de Pondaungia cotteri, ici reconnu comme la seule espĂšce d\u27anthropoĂŻde de grande taille de la formation de Pondaung. Des lignes d\u27arrĂȘt de croissance ont Ă©tĂ© observĂ©es sur plusieurs sections de mandibules attribuĂ©es Ă cette espĂšce. Elles pourraient correspondre Ă des cycles annuels, en rĂ©ponse Ă des variations saisonniĂšres de l\u27environnement. Nous disposerions ainsi d\u27un outil permettant d\u27estimer approximativement la longĂ©vitĂ© minimale des individus. Plusieurs caractĂšres semblent indiquer que P. cotteri Ă©tait adaptĂ© Ă une nourriture dure et Ă la survie sous un climat Ă saisons trĂšs marquĂ©es, ainsi qu\u27Ă des pĂ©riodes prolongĂ©es de sous-alimentation.Several newly recovered specimens documenting the Eocene Myanmar (South East Asia) anthropoid taxa Pondaungia and Amphipithecus modify the classical understanding of the taxonomy of these two primates, which have in fact no substantial morphological differences. Using tooth wear stages and the elevation of the horizontal branch of the mandible below the foramen mentale, we show a continuous variation, here attributed to individual aging. In addition, a strong size dimorphism is demonstrated, which is attributed to sexual dimorphism. In this context, Amphipithecus mogaungensis holotype is interpreted as a male of Pondaungia cotteri, which is recognized as the only large-bodied anthropoid of the Pondaung Formation. Growth arrest lines (LAGs) have been observed in several sections of lower jaws attributed to that species. These LAGs are here interpreted as regular increments, which formed in response to seasonal variability in the environment. They likely correspond to annual cycles, and the minimum longevity of the individuals can thus be roughly estimated. Several features indicate that P. cotteri may have been adapted to hard food diet and to survive in a strong seasonal climate with annual food shortage periods.</p
A new species of Propalaeotherium (Palaeotheriidae, Perissodactyla, Mammalia) from the Middle Eocene locality of Aumelas (HĂ©rault, France).
International audienceA new Propalaeotherium species, clearly distinct from the genus Eurohippus, is described. It is characterized by having a similar size as P. voigti from the German Geiseltal localities (MP 11 to MP 13 reference-level), but differs in several features suggesting a slighty more derived morphology. It presents indeed less brachyodont crowns with less prominent and less elevated cingula, slightly larger relative surface of premolars, and a more marked metaconid splitting on cheek teeth. This new species is unknown from other European localities except the nearby Saint-Martin de Londres locality which has been considered older than the MP 13 level
New dental elements of the oldest proviverrine mammal, Parvagula palulae, from the Early Eocene of Southern France support possible African origin of the subfamily
International audienceHere we describe and illustrate specimens of hyaenodont mammals from two Early Eocene localities of Southern France: Fournes (Minervois) and Fordones (CorbiĂšres). Some of these specimens were previously described as cf. Hyracolestes sp. (Cimolesta, Sarcodontidae), a taxon only known from Asia, but new arguments allow their referring to the small proviverrine hyaenodont Parvagula palulae which was previously only recorded in Palette (Provence). The material notably includes the oldest p4 ever recorded for the European endemic subfamily Proviverrinae. This new material shows that, by the beginning of the Early Eocene, proviverrines already display their typical combination of dental features characterized by the presence of a large paraconid and entoconid on p4. The comparison between the earliest European proviverrines and sinopines (a mostly North American radiation) supports the divergence of the two subfamilies by this time. Moreover, the early proviverrines are morphologically similar to the African hyaenodont Tinerhodon (Late Paleocene). Consequently, the history of the European proviverrines is likely rooted in Africa. Finally, the new specimens support a similar age for the localities of Palette and Fordones, and a younger age for Fournes. Due to the ages of these localities Parvagula palulae must be regarded as the oldest proviverrine
First Middle Miocene rodents from the Mae Moh Basin (Thailand) : biochronological and paleoenvironmental implications
International audienc
La Neuve, gisement à plantes, invertébrés et vertébrés du Bégudien (Sénonien supérieur continental) du bassin d'Aix-en-Provence
Garcia, Géraldine, Duffaud, Sylvain, Feist, Monique, Marandat, Bernard, Tambareau, Yvette, Villatte, Juliette, Sigé, Bernard (2000): La Neuve, gisement à plantes, invertébrés et vertébrés du Bégudien (Sénonien supérieur continental) du bassin d'Aix-en-Provence. Geodiversitas 22 (3): 325-348, DOI: http://doi.org/10.5281/zenodo.537111
Une nouvelle faune de vertĂ©brĂ©s continentaux de lâOligocĂšne supĂ©rieur (MP26) Ă Saint-Privat-des-Vieux (Bassin dâAlĂšs, Gard, Sud de France)
International audienceCette faune rĂ©sulte de la brĂȘve exploitation dâun petit niveau fossilifĂšre mis au jour lors de lâouverture dâune tranchĂ©e pour lâinstallation dâune conduite de gaz. MĂȘme si la quantitĂ© de sĂ©diment fossilifĂšre accessible Ă©tait limitĂ©e, la diversitĂ© de la faune rĂ©coltĂ©e est du mĂȘme ordre que celle de localitĂ©s contemporaines. Parmi les 40 espĂšces de vertĂ©brĂ©s reconnues, quelques unes sont amphibies mais la plupart est terrestre. Parmi elles, des marqueurs biochronologiques tel Issiodoromys pauffiensis Vianey-Liaud, 1987 (Rodentia, Theridomyidae) sont mieux dĂ©finis. Cette espĂšce est comparĂ©e Ă la population type du niveau repĂšre mammalien du PalĂ©ogĂšne MP 26 (Mas-de-PauffiĂ©, Lot; Chattien infĂ©rieur). De plus, des stades Ă©volutifs jusque lĂ inconnus sont dĂ©crits pour quelques espĂšces moins abondantes : câest le cas dâun rongeur Sciuridae Comtia n. gen., dâune chauve-souris Molossidae (Cuvierimops sp.), dâun probable Talpidae, et du Hyaenodontida Thereutherium thylacodes Filhol, 1876. Lâattribution familiale du serpent Platyspondylia Rage, 1974 est discutĂ©e. Lâun des lĂ©zards du gisement pourrait ĂȘtre le plus ancien Shinisauria. La diversitĂ© de cette nouvelle faune est comparĂ©e avec celle de plusieurs faunes contemporaines (principalement Mas-de-PauffiĂ©, Saint-Menoux, Saint-Henri/Saint-AndrĂ© MĂŒmliswil-Hardberg et Oensingen 11). Le choix de Mas-de-PauffiĂ© comme localitĂ©-type du niveau-repĂšre MP 26 est confortĂ©
The Palaeotheriidae (Equoidea, Perissodactyla, Mammalia) from the Eocene fauna of Aumelas (HĂ©rault department, France)
International audienceLa riche faune de vertĂ©brĂ©s dâAumelas a Ă©tĂ© le sujet depuis plusieurs dĂ©cennies de diverses publications partielles qui avaient conduit Ă lui assigner un Ăąge voisin du niveau-repĂšre MP 13 dans lâĂ©chelle biochronologique de mammifĂšres dâEurope de lâOuest. Mais elle reste encore partiellement inĂ©dite et cet article fait partie dâune rĂ©vision gĂ©nĂ©rale de la faune. En ce qui concerne les pĂ©rissodactyles Ă©quoĂŻdes, cinq taxons ont Ă©tĂ© distinguĂ©s, que lâon attribue Ă des «âPachynolophinaeâ» Ă lâexclusion de tout Palaeotheriinae. Deux espĂšces sont prĂ©dominantes dans ce groupeâ: Propalaeotherium sudrei Remy, Krasovec & Marandat, 2016 et Pachynolophus ruscassierensis n. sp. Les trois autres taxons sont moins bien documentĂ©s, ce qui empĂȘche leur dĂ©termination spĂ©cifique, PachynoÂlophus sp., Propalaeotherium cf. gaudryi (Lemoine, 1878) et Lophiotherium sp. Lâensemble de ces espĂšces prĂ©sente des caractĂ©ristiques relativement archaĂŻques, mises en lumiĂšre grĂące Ă une analyse cladistique. Une telle conclusion remet en question le consensus jusquâici en vigueur sur la datation de la faune, dans le sens dâun Ăąge biochronologique plus ancien. Cette discordance sera analysĂ©e dans un travail synthĂ©tique ultĂ©rieur, en conjonction avec les spĂ©cialistes des diffĂ©rents ordres de mammifĂšres et de reptiles reprĂ©sentĂ©s dans la localitĂ©
A new member of the Mustelida (Mammalia : Carnivora) from the Paleogene of Southern Asia
International audienc
Ypresian Mammalian Localities of Fournes, Saint-Eulalie and Azillanet (Minervois, Southern France) : Refined Biochronology Based on ÎŽ13Corg Chemostratigraphy
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