The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Une première approche de la phylogénie des Polyptériformes est tentée à partir d'une étude morphologique ethistologique des restes fossiles (écailles; pinnules et vertèbres) provenant du Crétacé et du Tertiaire sud-américain (Bolivie; Brésil) et africain (Egypte; Niger; Tunisie; Kénya; Ethiopie) et des mêmes éléments squelettiques appartenant aux taxa actuels d'Afrique.
Aulacopleurid trilobites of the Malvinokaffric Realm (Lower and Middle Devonian) of South America and South Africa include seven species (of which six are formally named) assigned to two genera. These include a distinct subclade of the otarionine Maurotarion Alberti, 1969, and at least two species of Malimanaspis Baldis & Longobucco, 1977, a genus of problematic affinities. Malimanaspis is considered...
The eggshell material from some Late Cretaceous Peruvian sites is reevaluated in light of the results ofeggshell research in the last years. As a preliminary step, a new oospecies is first described from the Aix Basin (France): Megaloolithus pseudomamillare. The eggshells from the Bagua Basin Peru are divided into six types [1, Dinosauroid spherulitic type, Tubospherulitic morphotype and Angusticanaliculate...
This paper completes the taxonomic description of the recently discovered Permian “Glossopteris”taphofloras from Carapacha Basin and compares its entire paleofloristic assemblage with other known Permian plant associations from Argentina. Carapacha Basin was a halfgraben located in the southern region of La Pampa province (central Argentina) that received fluvial/lacustrine sediments from Early Permian...
New fossil marsupials from Paleogene levels at Antofagasta de la Sierra, in Northwestern Argentina, are described: Punadolops nov. gen. (Prepidolopidae), represented by a single species, P. alonsoi (Pascual, 1983), Bonapartherium serrensis nov. sp. (Bonapartheriidae), and an isolated lower molar tentatively assigned to Arminiheringia sp. (Proborhyaenidae). Marsupials from Antofagasta de la Sierra...
Les restes de Palaeolama de l'Aire archéologique de Sâo Raimundo Nonato (Piaui, Brésil) appartiennent à deux espèces, P. major et P. niedae nov. sp. P. major, proche de celui de Lagoa Santa, est attesté à la Toca do Serrote do Artur. P. niedae est bien représenté notamment dans les Toca do Garrincho et da Janela da Barra do Antonião. C'est une forme de très grande taille, moins gracile que la précédente...
Late Pleistocene and Holocene deer remains from Ecuadorian sites have been analysed. Most of the material belongs to Odocoileus virginianus ustus, which is documented in latest Pleistocene deposits, in the Interandean Depression. Coastal sediments referred to the Holocene bear remains of Odocoileus salinae. O. v. ustus and O. salinae differ in size and in the morphology of the antlers and of the dentitions...
A new genus and species of ''libellulid'' dragonfly, Austrolibellula noroestenia nov. gen., nov. sp., of the group Italoansida , is described. The specimen comes from the Maiz Gordo Formation (late Paleocene) that crops out in northwestern Argentina. Its phylogenetic relationships within Cavilabiata BECHLY, 1996 are discussed.
In this paper the systematic position and age of several Pleistocene cat remains found in southern South American are studied, in an attempt to more fully document the scarce record of the group and clear up their obscure Quaternary history. The fossils are compared with a large sample of recent specimens by means of qualitative and quantitative characters, as well as multivariate methods (discriminant...
Se presenta un estudio tafonómico sobre la carcasa de un individuo adulto de guanaco (Lama guanicoe) recientemente muerto y consumido por uno o más pumas (Puma concolor) en la Reserva Laguna del Diamante (Provincia de Mendoza, Argentina) y se discute el caso a la luz del conocimiento tafonómico actual sobre este agente en América. La carcasa se presentaba dispersa a lo largo de más de 30m y básicamente...
The first radiolarians discovered in the Ordovician of the Argentinian Precordillera are reported. The material is associated with conodonts indicating the upper part of the Lenodus variabilis Biozone (Lower Darriwilian, Da1-2). The low diversity radiolarian fauna shows similarities with Middle Ordovician radiolarians from the Akzhal Mountains of Kazakhstan. However, a close comparison is difficult...
Se da a conocer la malacofauna recuperada en la unidad sedimentaria holocena de la localidad fosilífera de Villa Valle María (Diamante, Entre Ríos, Argentina), datada en 2,490±45 años 14 C A.P. sobre Bulimulus sp., y que representa el primer registro ilustrado de moluscos cuaternarios en sedimentos loéssicos de Argentina. La localidad corresponde a un depósito acumulado por acción eólica,...
Here we present a revision of the fossil record of chitons (Mollusca, Polyplacophora) of Late Pleistocene and Holocene marine deposits of Uruguay and discuss their potential for palaeoenvironmental reconstruction. Chitons were recorded as isolated valves in bivalve- and gastropod-rich assemblages. They are represented by the species Chaetopleura angulata (Spengler), C. isabellei (d’Orbigny), C. asperrima...
A large set of South American fossils belonging to the genus Tapirus has been described on the basis of differences in size and proportions of lower molariform teeth. Nevertheless, the reliability of dental proportions for the diagnosis of fossil tapir species is controversial. In this paper, we describe new fossil material of Tapirus from the Quaternary of Serra da Bodoquena, Southwestern Brazil,...
The Permian ([?]Late Cisuralian-Lopingian) outcrops of the La Golondrina Formation (Santa Cruz, Argentina) are known for their abundant and diverse fossil flora, including Gondwanan and Euramerican elements. However, of all the groups represented, fructifications have only been recognized for a few glossopterids and sphenophytes. This study describes and reviews 11 taxa from both specimens housed...
Evidence of plant–arthropod interactions in three orders of gymnosperms is documented in at least five localities from Lower Permian strata of the Río Genoa Formation (Patagonia, Argentina). Arthropod damages were identified in Glossopteris, Gangamopteris, Cordaites and Gingkoites leaves, corresponding to four interactive categories: margin feeding, hole feeding, surface feeding, and oviposition....
The first Devonian fossils in Brazil were discovered in the Maecuru Formation (Amazon Basin) in the second half of the 19th century. Since then, this formation has been found to contain a very diverse fauna. However, only four species of echinoderms, all from the class Crinoidea, were known until now. Herein, this diversity is nearly tripled with the description of eight crinoid species and the revision...
Lama guanicoe (Müller, 1776) is one of the most important South American large mammal species for both biologists, ecologists and archaeologists, and body size of modern and prehistoric populations of guanaco has been one of the most studied parameters. In this paper, we evaluate the latitudinal differences in body size of different modern populations of guanaco from Argentinean Patagonia based on...
South-American foreland basins are related to the compressional tectonics that built the Andes starting in the Mesozoic; then the Neogene uplift of the Eastern Cordillera directly affected the sedimentary history of Amazonia, changing the course of the proto-Amazon/Orinoco Rivers. Marine influence in South America has a long history with episodic transgressions and regressions from the Campanian to...
Geological explorations of the basal beds of the Río Yuca Formation (Tucupido region, Portuguesa State, western Venezuela) resulted in the recognition of a new vertebrate assemblage that includes eight taxa: the toxodont cf. Adinotherium, a Peltephilidae armadillo, the freshwaters fishes Platysilurus and Phractocephalus, the caiman Purussaurus, an indeterminate dolphin, turtles, and the previously...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.