Mostrando recursos 1 - 20 de 1.618

  1. RESEARCH ARTICLE A Fish Assemblage from the Middle Eocene from Libya (Dur At-Talah) and the Earliest Record of Modern African Fish Genera

    Olga Otero; Aurélie Pinton; Sylvain Adnet; Xavier Valentin; Mustapha Salem; Jean-jacques Jaeger
    In the early nineteen sixties, Arambourg and Magnier found some freshwater fish (i.e., Poly-pterus sp., Siluriformes indet. and Lates sp.) mixed with marine members in an Eocene ver-tebrate assemblage at Gebel Coquin, in the southern Libyan Desert. This locality, aged ca 37–39Ma and now known under the name of Dur At-Talah, has been recently excavated. A new fish assemblage, mostly composed of teeth, was collected by the Mission Paléontologi-que Franco-Libyenne. In this paper, we describe freshwater fish members including a dip-noan (Protopterus sp.), and several actinopterygians: bichir (Polypterus sp.), aba fish (Gymnarchus sp.), several catfishes (Chrysichthys sp. and a mochokid...

  2. Polens e esporos da flora do Rio Grande do Sul

    Mantovani, Anelise; Lorscheitter, Maria Luisa

  3. 2Departamento de Estratigrafía y Paleontología,

    Julyan H. E. Cartwright; Antonio G. Checa; Bruno Escribano; C. Ignacio Sainz-díaz
    Crystal growth has been widely studied for many years, and, since the pioneer-ing work of Burton, Cabrera, and Frank, spirals and target patterns on the crystal surface have been understood as forms of tangential crystal growth mediated by defects and by two-dimensional nucleation. Similar spirals and target patterns are ubiquitous in physical systems describable as excitable media. Here we demon-strate that this is not merely a superficial resemblance; that the physics of crystal growth can be set within the framework of an excitable medium, and that appreciat-ing this correspondence may prove useful to both fields. Apart from solid crystals, we...

  4. Current Trends in Paleontology and Evolution XIII EJIP Conference Proceedings Current Trends in Paleontology and Evolution Libro de resúmenes / Conference proceedings XIII Encuentro en Jóvenes Investigadores en Paleontología (XIII EJIP) XIII Meeting of Ea

    Laura Domingo; M. Soledad Domingo; Omid Fesharaki; Blanca García Yelo; Ana Rosa; Gómez Cano; Daniel Hontecillas; Juan L. Cantalapiedra; Paloma López Guerrero; Adriana Oliver; Miriam Pérez De Los Ríos; María Ríos; Óscar Sanisidro; Alberto Valenciano (editors; Designed Juan; L. Cantalapiedra; Óscar Sanisidro; Comité Organizador; Gema Alcalde; Laura Domingo; M. Soledad Domingo; Omid Fesharaki; Blanca A. García Yelo; Ana Rosa; Gómez Cano; Verónica Hernández-ballarín; Daniel Hontecillas Tamayo; Juan L. Cantalapiedra; Paloma López-guerrero; Adriana Oliver; Jonathan S. Pelegrin; Miriam Pérez De Los Ríos; Maria Ríos Ibáñez; Óscar Sanisidro; Alberto Valenciano Vaquero; Comité Científico
    Juan Abella (Universidad Estatal de la Península de Santa Elena-Institut Català de Paleontologia Miquel Crusafont) Maria Teresa Alberdi (Museo Nacional de Ciencias Naturales-Consejo Superior de Investigaciones Científicas) Gema Alcalde (Independent researcher)

  5. medusiform metazoan Eldonia from the Chengjiang Lagerstatte. Acta Paleontologi-

    Eldonia From The Chengjiang Lagerstatte
    The alleged Chengjiang scyphozoans Stellostomites eumorphus and Yunnanome-dusa eleganta are conspecific. Because of the strong resemblance to the Burgess Shale type species of Eldonia, the Chinese species is relocated to this genus. Eldonia, originally described as a holothurian, on anatomical grounds may as well be interpreted a s a lophophorate. The superficial resemblance to jelly-fish is apparently a result of adaptation to pelagic life. Although the extant lophophorates are without exception sedentary, their pelagic relatives were probably abundant in the Early Paleozoic.

  6. $rec.titulo

    Norme Per Gli Autori
    Zoologia, Entomologia, Botanica, Mineralogia, Geologia, Paleontologia) e dell’Archeologia, con particolare riferimento al

  7. Thermophysiology and biology of Giganotosaurus: comparison with Tyrannosaurus, Paleontologia Electronica

    Reese E. Barrick; William J. Showers; Department Of Marine
    Large carnivorous dinosaurs present many interesting biological and ecological questions. The most important information for understanding the ecology of these dinosaurs is their metabolism and thermal physiology. These factors in conjunction with their body mass determine the quantity of meat these animals needed to consume, how rapidly they grew and behavioral characteristics such as range size and reproduction. Oxygen isotope values of bone phosphate may be used to determine the relative temperature variations experienced by skeletal regions during bone deposition. Temperature variations relate to an animal’s thermal physiology and can be used to estimate their metabolic physiology. Previously, we reported...

  8. 3D Bite Modeling and Feeding Mechanics of the Largest Living Amphibian, the Chinese Giant Salamander Andrias davidianus (Amphibia:Urodela)

    Fortuny, Josep; Institut Català de Paleontologia Miquel Crusafont; Marcé-Nogué, Jordi; Institut Català de Paleontologia Miquel Crusafont; Heiss, Egon; Department fur Integrative Zoologie, Fakultat fur Lebenswissenschaften, University of Vienna; Department fur Integrative Zoologie, Fakultat fur Lebenswissenschaften, University of Vienna; Sanchez, Montserrat; Universitat Politècnica de Catalunya—BarcelonaTech; Gil, Lluis; Universitat Politècnica de Catalunya—BarcelonaTech; Galobart, Àngel; Institut Català de Paleontologia Miquel Crusafont
    Biting is an integral feature of the feeding mechanism for aquatic and terrestrial salamanders to capture, fix or immobilize elusive or struggling prey. However, little information is available on how it works and the functional implications of this biting system in amphibians although such approaches might be essential to understand feeding systems performed by early tetrapods. Herein, the skull biomechanics of the Chinese giant salamander, Andrias davidianus is investigated using 3D finite element analysis. The results reveal that the prey contact position is crucial for the structural performance of the skull, which is probably related to the lack of a...

  9. Rev. bras. paleontol. 11(3):199-206, Setembro/Dezembro 2008 © 2008 by the Sociedade Brasileira de Paleontologia doi: 10.4072/rbp.2008.3.06

    ABSTRACT – The postcranial remains of the saber-toothed cat Smilodon populator dealt with here corresponds to the first occurrence of the taxon in the State of São Paulo, filling a gap in its geographical distribution. The fossils were collected in Abismo Iguatemi, a karstic fissure located in the municipality of Apiaí, upper Ribeira River valley. Given that the described specimens share equivalent size, similar preservation, and were found relatively close to one another, without duplicated elements, it is suggested that these belong to a single individual. Concerning the accumulation, this animal might have entered the fissure partially or completely articulated,...

  10. On the original author and year of description of the extinct hyaenid Pachycrocuta brevirostris

    David M. Alba; Víctor Vinuesa; Joan Madurell-malapeira
    mends providing the author and year of original description of any taxon, when first mentioned in a publication, which is useful for both taxonomic and nomenclatural reasons. Here we show that the authorship of the extinct hyaenid taxon Hy-aena brevirostris, type species of the genus Pachycrocuta, has been incorrectly attributed to “Aymard, 1846 ” for more than a century on the basis of a publication that never existed. Our bibliographic research indicates that the first published work in which the name was employed—Gervais ’ (1848– 1852) Zoologie et Paléontologie françaises, the part dealing with carnivorans being issued in 1850—fulfils the...

  11. Lower deciduous tooth homologies in Erethizontidae

    Adriana Magdalena Candela
    Cusp and lophid homologies of the lower deciduous teeth (dp4) in erethizontids and other Hystricognathi are specified. On this basis, a new nomenclature for these structures is proposed. The probable primitive condition and evolution of the occlusal patterns of these teeth are also analyzed. In contrast to previous proposals, it is concluded that the mesoconid, mesostylid, and mesolophid of the dp4 of erethizontids can be recognized since the Early Miocene. The anteriormost three lophids of the pentalophodont dp4 of the Erethizontidae would be homologous to the anterolophid, metalophulid II, and mesolophid, respectively. In addition, it may be proposed that the...

  12. Coleta e preparacao de material polinico de sedimentos quaternarios

    Lorensi, Glademir Antonio; Lorscheitter, Maria Luisa

  13. Estudo de meis monoflorais no Rio Grande do Sul

    Thome, Fernando Adilio; Lorscheitter, Maria Luisa

  14. Paleontologia do devoniano nos campos gerais do Paraná: contribuições de uma prática de campo para o ensino de geociências na educação básica

    Fernandes, Fernando
    Esse trabalho referente à abordagem paleontológica do período devoniano, foi realizado através da discussão teórica e da prática de campo na região dos campos gerais especificamente nas cidades de Castro, Ponta Grossa e Tibagi-PR. Como interesse fez se o reconhecimento dos afloramentos fossilíferos e consecutivamente a coleta e classificação de alguns exemplares. Estes, através da taxonomia e a tafonomia serviram de material para definir a estratificação cronológica dos achados. De forma geral, esse trabalho teve como base a compreensão paleontológica relacionada a saídas de campo feitas com o grupo de pesquisa Palaios da Universidade Estadual de Ponta Grossa UEPG, contextualizando...

  15. La Paléontologie humaine en Charente

    Piveteau, Jean Luc
    Les gisements de Charente qui ont fourni des restes humains se répartissent géographiquement en deux groupes : le bassin de la Tardoire d'une part, le sud du département d'autre part. Du premier groupe, nous citetons les grottes ou abris de Fontéchevade rapporté au Riss-Wurm, de La Chaise peut-être d'âge rissien supérieur, du Placard et de Marillac du Moustérien. Dans le second groupe, nous avons les gisements de la grotte à Melon, près de Châteauneuf-sur-Charente ; de La Quina, et enfin de la région de Puymoyen. Ils paraissent correspondre à la civilisation moustérienne.

  16. Apuntes sobre la geología y la paleontología de los territorios del Rio Negro y Neuquen, diciembre de 1895 á junio de 1896.

    Roth, Santiago.
    Reprinted from Revista del Museo de La Plata, v.9.

  17. Tafonomia e paleoicnologia do neogénico superior do sector Cacela-Huelva (SE da Ibéria)

    Santos, Ana Alexandra Guerreiro dos
    Tese de doutoramento em Paleontologia. Faculdade de Ciências do Mar e do Ambiente, Univ. do Algarve, 2005

  18. Rudistas (Hippuritida, Bivalvia) del Cenomaniense-Coniaciense (Cretácico superior) del Pirineo meridional-central. Paleontología y bioestratigrafía

    Troya García, Luis
    Los bivalvos rudistas están ampliamente representados entre las sucesiones de materiales carbonatados someros correspondientes al margen sur de la cuenca pirenaica durante el Cretácico superior y que hoy día afloran a lo largo del Pirineo meridional-central. Las faunas del Coniaciense superior/Santoniense inferior al Maastrichtiense son bastante bien conocidas y han sido objeto de diferentes estudios, pero no es así para las anteriores que, si se conocen, es principalmente por citas en algunos trabajos. El estudio de diferentes afloramientos correspondientes al Cenomaniense, Turoniense superior y Coniaciense, alrededor de la cuenca de Tremp (zona de Sopeira y la Sierra de Sant Gervàs, Congost...

  19. Descrição osteo-histológica de elementos fósseis de Dinodontosaurus turpior (Therapsida, Dicynodontia), Mesotriássico do Rio Grande do Sul, BrasilD

    Bueno, Ana de Oliveira
    Estudos relacionados à microestrutura óssea de elementos fósseis surgiram no século XVIII, porém começaram a desenvolver-se mais profundamente somente nas últimas décadas. Hoje, a Paleohistologia é uma das áreas mais promissoras dentro da Paleontologia, pois nos possibilita acessar uma série de características do espécime fóssil que complementam nosso conhecimento sobre o animal. Assim como outros clados, os Dicynodontia vêm sendo estudados por esse viés há muito tempo, e hoje conhecemos os padrões ósseos e de crescimento de um grande número de espécies. A presente dissertação traz a descrição ósteo-histológica de alguns elementos fósseis de Dinodontosaurus turpior, uma espécie de dicinodonte...

  20. Problèmes actuels en paléontologie des Vertébrés paléozoïques

    Blieck, Alain
    National audience

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