20663726.Pdf
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
The Relationships of the Arctostylopidae (Mammalia) New Data and Interpretation
THE RELATIONSHIPS OF THE ARCTOSTYLOPIDAE (MAMMALIA) NEW DATA AND INTERPRETATION RICHARD L. CIFELLI,' CHARLES R. SCHAFF,- AND MALCOLM C. McKENNA CONTENTS Abstract. The dental morpholog steini, hitherto known onl) from pari Abstract cheek- tooth series is desi rilx-d on the ba Introduction collected specimen including .i near!) Acknowledgments per and lower dentition \U arctoMylopid • Abbreviations from North America principally from th Paleontology 5 Systematic Basin, Wyoming, are apparentl) referable l Order new 5 Arctostylopida, gle species, which therefore ranges from the lati 5 Family Arctostylopidae luiiian through the ( larklorkian Other an I 6 Matthew, 1915 to the \si.m Arctostylops genera are restricted I'.ileogi A. steini Matthew, 1915 6 A previously described 5pe< ies "l Matthew and Granger, Palaeostijlops sty/ops is placed in a new genus Gashal 1 1 1925 Arctostylopidae and its constituent subordii P. iturus Matthew and Granger, are diagnosed, and a h\ pothesis "I relationshi| 1925 1 5 in the family is presented B) comparison witl 15 new l>\ / Gashatostylops genus ungulate morphohpe as represented et .. 15 G. macrodon (Matthew al., 1929) latum, Asiostylops spumes is hypothesized 20 and 1976 ... Sinostylops Tang Yan, most primitive member ol the family; Both 1976 ... 20 S. promissus Tang and Yan, notios and B. progressus retain man) primitivi Bothriostylops Zheng and Huang, tures but clearK hear some ol the spec lalizatkx 22 other 1986 in Palaeostijlops, Arctostylops, and and 1986 ... North \mt B. notios Zheng Huang, genera. Of these derived taxa, and 1976) sister taxou to the n B. progressus (Tang Yan, tostylops may be the 1978 22 are in distributioi Anatolostylops Zhai, genera, all of which Vsiatfc 23 A. -
Evolutionary and Functional Implications of Incisor Enamel Microstructure Diversity in Notoungulata (Placentalia, Mammalia)
Journal of Mammalian Evolution https://doi.org/10.1007/s10914-019-09462-z ORIGINAL PAPER Evolutionary and Functional Implications of Incisor Enamel Microstructure Diversity in Notoungulata (Placentalia, Mammalia) Andréa Filippo1 & Daniela C. Kalthoff2 & Guillaume Billet1 & Helder Gomes Rodrigues1,3,4 # The Author(s) 2019 Abstract Notoungulates are an extinct clade of South American mammals, comprising a large diversity of body sizes and skeletal morphologies, and including taxa with highly specialized dentitions. The evolutionary history of notoungulates is characterized by numerous dental convergences, such as continuous growth of both molars and incisors, which repeatedly occurred in late- diverging families to counter the effects of abrasion. The main goal of this study is to determine if the acquisition of high-crowned incisors in different notoungulate families was accompanied by significant and repeated changes in their enamel microstructure. More generally, it aims at identifying evolutionary patterns of incisor enamel microstructure in notoungulates. Fifty-eight samples of incisors encompassing 21 genera of notoungulates were sectioned to study the enamel microstructure using a scanning electron microscope. We showed that most Eocene taxa were characterized by an incisor schmelzmuster involving only radial enamel. Interestingly, derived schmelzmusters involving the presence of Hunter-Schreger bands (HSB) and of modified radial enamel occurred in all four late-diverging families, mostly in parallel with morphological specializations, such as crown height increase. Despite a high degree of homoplasy, some characters detected at different levels of enamel complexity (e.g., labial versus lingual sides, upper versus lower incisors) might also be useful for phylogenetic reconstructions. Comparisons with perissodactyls showed that notoungulates paralleled equids in some aspects related to abrasion resistance, in having evolved transverse to oblique HSB combined with modified radial enamel and high-crowned incisors. -
Teeth Complexity, Hypsodonty and Body Mass in Santacrucian (Early Miocene) Notoungulates (Mammalia) Guillermo H
Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 106, 303–313, 2017 Teeth complexity, hypsodonty and body mass in Santacrucian (Early Miocene) notoungulates (Mammalia) Guillermo H. Cassini1,2,7, Santiago Herna´ndez Del Pino3,7, Nahuel A. Mun˜oz4,7, M. V. Walter G. Acosta5, Mercedes Ferna´ndez2,6,7, M. Susana Bargo4,8 and Sergio F. Vizcaı´no4,7 1 Divisio´n Mastozoologı´a, Museo Argentino de Ciencias Naturales ‘‘Bernardino Rivadavia’’, Ciudad Auto´noma de Buenos Aires, Argentina. Email: [email protected] 2 Departamento de Ciencias Ba´sicas, Universidad Nacional de Luja´n, Luja´n, Buenos Aires, Argentina. Email: [email protected] 3 Paleontologı´a, Instituto de Nivologı´a, Glaciologı´a y Ciencias Ambientales, Centro Cientı´fico Tecnolo´gico – CONICET Mendoza, Mendoza, Argentina. Email: [email protected] 4 Divisio´n Paleontologı´a Vertebrados, Museo de La Plata, Unidades de Investigacio´n Anexo Museo, FCNyM-UNLP, 60 y 122, 1900 La Plata, Argentina. Email: [email protected]; [email protected]; [email protected] 5 Ca´tedra de Semiologı´a, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Calle 60 y 118 s/n, La Plata, Argentina. Email: [email protected] 6 Divisio´n Paleontologı´a de Vertebrados, Museo Argentino de Ciencias Naturales ‘‘Bernardino Rivadavia’’, Ciudad Auto´noma de Buenos Aires, Argentina. 7 CONICET. Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas. 8 CIC. Comisio´n de Investigaciones Cientı´ficas de la provincia de Buenos Aires. ABSTRACT: Notoungulates, native South American fossil mammals, have been recently objective of several palaeoecological studies. -
“Toscas Del Río De La Plata” (Buenos Aires, Argentina)
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by El Servicio de Difusión de la Creación Intelectual Soibelzon et al.: Análisis faunístico de vertebrados deRev. las Mus. toscas Argentino del Río de Cienc. La Plata Nat., n.s.291 10(2): 291-308, 2008 Buenos Aires, ISSN 1514-5158 Análisis faunístico de vertebrados de las toscas del Río de La Plata (Buenos Aires, Argentina): un yacimiento paleontológico en desaparición E. SOIBELZON1, G. M. GASPARINI1, A. E. ZURITA2 & L. H. SOIBELZON1 1Departamento Científico de Paleontología de Vertebrados, Museo de La Plata, Facultad de Ciencias Naturales y Museo, UNLP. Paseo del Bosque s/n, 1900 La Plata. Argentina. CONICET. [email protected]. 2 Centro de Ecología Aplicada del Litoral (CECOAL-CONICET) y Universidad Nacional del Nordeste, Corrientes, Argentina Abstract: Faunistic analisys of vertebrates from las toscas del Río de La Plata (Buenos Aires, Argentina): a palaeontological site in disappearance. At the coast of the río de la Plata in the Buenos Aires city lies a classic paleontological site, known as toscas del Río de La Plata or simple as las toscas. It has been studied for over 120 years and, although it has been widely spread, today is only possible to observe it during low tide. For this reason, most of the available materials are those collected during the first half of the XXth century, and that so far have only been incorporated into scarce taxonomic reviews. Among the fossils collected in las toscas highlights Glyptodon munizi Ameghino, Neosclerocalyptus pseudornatus Ameghino, Mesotherium cristatum Serrés, Arctotherium angustidens Gervais y Ameghino and Theriodictis platensis (Mercerat); all are exclusive species from the Ensenadan Stage (early to -middle Pleistocene). -
Michael O. Woodburne1,* Alberto L. Cione2,**, and Eduardo P. Tonni2,***
Woodburne, M.O.; Cione, A.L.; and Tonni, E.P., 2006, Central American provincialism and the 73 Great American Biotic Interchange, in Carranza-Castañeda, Óscar, and Lindsay, E.H., eds., Ad- vances in late Tertiary vertebrate paleontology in Mexico and the Great American Biotic In- terchange: Universidad Nacional Autónoma de México, Instituto de Geología and Centro de Geociencias, Publicación Especial 4, p. 73–101. CENTRAL AMERICAN PROVINCIALISM AND THE GREAT AMERICAN BIOTIC INTERCHANGE Michael O. Woodburne1,* Alberto L. Cione2,**, and Eduardo P. Tonni2,*** ABSTRACT The age and phyletic context of mammals that dispersed between North and South America during the past 9 m.y. is summarized. The presence of a Central American province of cladogenesis and faunal differentiation is explored. One apparent aspect of such a province is to delay dispersals of some taxa northward from Mexico into the continental United States, largely during the Blancan. Examples are recognized among the various xenar- thrans, and cervid artiodactyls. Whereas the concept of a Central American province has been mentioned in past investigations it is upgraded here. Paratoceras (protoceratid artio- dactyl) and rhynchotheriine proboscideans provide perhaps the most compelling examples of Central American cladogenesis (late Arikareean to early Barstovian and Hemphillian to Rancholabrean, respectively), but this category includes Hemphillian sigmodontine rodents, and perhaps a variety of carnivores and ungulates from Honduras in the medial Miocene, as well as peccaries and equids from Mexico. For South America, Mexican canids and hy- drochoerid rodents may have had an earlier development in Mexico. Remarkably, the first South American immigrants to Mexico (after the Miocene heralds; the xenarthrans Plaina and Glossotherium) apparently dispersed northward at the same time as the first Holarctic taxa dispersed to South America (sigmodontine rodents and the tayassuid artiodactyls). -
PROGRAMME ABSTRACTS AGM Papers
The Palaeontological Association 63rd Annual Meeting 15th–21st December 2019 University of Valencia, Spain PROGRAMME ABSTRACTS AGM papers Palaeontological Association 6 ANNUAL MEETING ANNUAL MEETING Palaeontological Association 1 The Palaeontological Association 63rd Annual Meeting 15th–21st December 2019 University of Valencia The programme and abstracts for the 63rd Annual Meeting of the Palaeontological Association are provided after the following information and summary of the meeting. An easy-to-navigate pocket guide to the Meeting is also available to delegates. Venue The Annual Meeting will take place in the faculties of Philosophy and Philology on the Blasco Ibañez Campus of the University of Valencia. The Symposium will take place in the Salon Actos Manuel Sanchis Guarner in the Faculty of Philology. The main meeting will take place in this and a nearby lecture theatre (Salon Actos, Faculty of Philosophy). There is a Metro stop just a few metres from the campus that connects with the centre of the city in 5-10 minutes (Line 3-Facultats). Alternatively, the campus is a 20-25 minute walk from the ‘old town’. Registration Registration will be possible before and during the Symposium at the entrance to the Salon Actos in the Faculty of Philosophy. During the main meeting the registration desk will continue to be available in the Faculty of Philosophy. Oral Presentations All speakers (apart from the symposium speakers) have been allocated 15 minutes. It is therefore expected that you prepare to speak for no more than 12 minutes to allow time for questions and switching between presenters. We have a number of parallel sessions in nearby lecture theatres so timing will be especially important. -
Mammalia, Notoungulata), from the Eocene of Patagonia, Argentina
Palaeontologia Electronica palaeo-electronica.org An exceptionally well-preserved skeleton of Thomashuxleya externa (Mammalia, Notoungulata), from the Eocene of Patagonia, Argentina Juan D. Carrillo and Robert J. Asher ABSTRACT We describe one of the oldest notoungulate skeletons with associated cranioden- tal and postcranial elements: Thomashuxleya externa (Isotemnidae) from Cañadón Vaca in Patagonia, Argentina (Vacan subage of the Casamayoran SALMA, middle Eocene). We provide body mass estimates given by different elements of the skeleton, describe the bone histology, and study its phylogenetic position. We note differences in the scapulae, humerii, ulnae, and radii of the new specimen in comparison with other specimens previously referred to this taxon. We estimate a body mass of 84 ± 24.2 kg, showing that notoungulates had acquired a large body mass by the middle Eocene. Bone histology shows that the new specimen was skeletally mature. The new material supports the placement of Thomashuxleya as an early, divergent member of Toxodon- tia. Among placentals, our phylogenetic analysis of a combined DNA, collagen, and morphology matrix favor only a limited number of possible phylogenetic relationships, but cannot yet arbitrate between potential affinities with Afrotheria or Laurasiatheria. With no constraint, maximum parsimony supports Thomashuxleya and Carodnia with Afrotheria. With Notoungulata and Litopterna constrained as monophyletic (including Macrauchenia and Toxodon known for collagens), these clades are reconstructed on the stem -
Fossil Calibration Schemes the Soft Explosive Model Of
Supplemental File 2: Fossil calibration schemes The soft explosive model of placental mammal evolution Matthew J. Phillips*,1 and Carmelo Fruciano1 1School of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, Australia *Corresponding author: E-mail: [email protected] Contents Fossil Calibration schemes ......................................................................................................... 1 Table S2 .................................................................................................................................. 1 New calibrations ..................................................................................................................... 3 Figure S2 ................................................................................................................................ 7 References ............................................................................................................................ 10 Calibration schemes Table S2. Soft-bound calibrations employed for the MCMCtree analyses of the 122-taxon, 128- taxon, and 57-taxon empirical datasets. Calibrations among placental mammals are largely based on dos Reis et al. [1], hence the designations dR32 and dR40 (numbers indicating the number of calibrations). Several new calibrations, including some inspired by Springer et al. [2], are described below the table. Also note that the 122-taxon dR40, 128-taxon and 57-taxon analyses employ bounds as listed below, whereas the dR32 analyses, -
(Early Miocene) in Lago Posadas, Southwestern Patagonia, Argentina
Andean Geology 46 (2): 383-420. May, 2019 Andean Geology doi: 10.5027/andgeoV46n2-3128 www.andeangeology.cl Sedimentology and fossil vertebrates of the Santa Cruz Formation (early Miocene) in Lago Posadas, southwestern Patagonia, Argentina *José I. Cuitiño1, Sergio F. Vizcaíno2, 3, M. Susana Bargo2, 4, Inés Aramendía5 1 Instituto Patagónico de Geología y Paleontología (IPGP, CCT CONICET-CENPAT). Boulevard Brown 2915, Puerto Madryn (9120), Chubut, Argentina. [email protected] 2 División Paleontología de Vertebrados, Museo de La Plata, Unidades de Investigación Anexo Museo, 60 y 122, La Plata (1900), Argentina. [email protected]; [email protected] 3 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Argentina. 4 Comisión de Investigaciones Científicas (CIC), calle 526 entre 10 y 11, 1900 La Plata-Buenos Aires, Argentina. 5 Instituto Patagónico para el Estudio de Ecosistemas Continentales (IPEEC, CCT CONICET-CENPAT). Boulevard Brown 2915, Puerto Madryn (9120), Chubut, Argentina. [email protected] * Corresponding author: [email protected] ABSTRACT. Lago Posadas is located at the foot of the Southern Patagonian Andes, in southwestern Argentina, where the early Miocene Santa Cruz Formation (SCF) shows thick and laterally continuous exposures. This region has been scarcely explored for fossil vertebrates since the first efforts by J.B. Hatcher in 1898-99. In this contribution, we performed sedimentologic and paleontological studies in order to reconstruct depositional -
American Museum Novitates
AMERICAN MUSEUM NOVITATES Number 3737, 64 pp. February 29, 2012 New leontiniid Notoungulata (Mammalia) from Chile and Argentina: comparative anatomy, character analysis, and phylogenetic hypotheses BRUCE J. SHOCKEY,1 JOHN J. FLYNN,2 DARIN A. CROFT,3 PHILLIP GANS,4 ANDRÉ R. WYSS5 ABSTRACT Herein we describe and name two new species of leontiniid notoungulates, one being the first known from Chile, the other from the Deseadan South American Land Mammal Age (SALMA) of Patagonia, Argentina. The Chilean leontiniid is from the lower horizons of the Cura-Mallín Formation (Tcm1) at Laguna del Laja in the Andean Main Range of central Chile. This new species, Colpodon antucoensis, is distinguishable from Patagonian species of Colpodon by way of its smaller I2; larger I3 and P1; sharper, V-shaped snout; and squarer upper premo- lars. The holotype came from a horizon that is constrained below and above by 40Ar/39Ar ages of 19.53 ± 0.60 and 19.25 ± 1.22, respectively, suggesting an age of roughly 19.5 Ma, or a little older (~19.8 Ma) when corrected for a revised age of the Fish Canyon Tuff standard. Either age is slightly younger than ages reported for the Colhuehuapian SALMA fauna at the Gran Bar- ranca. Taxa from the locality of the holotype of C. antucoensis are few, but they (e.g., the mylo- dontid sloth, Nematherium, and a lagostomine chinchillid) also suggest a post-Colhuehuapian 1Department of Biology, Manhattan College, New York, NY 10463; and Division of Paleontology, American Museum of Natural History. 2Division of Paleontology, and Richard Gilder Graduate School, American Museum of Natural History. -
Mammals and Stratigraphy : Geochronology of the Continental Mammal·Bearing Quaternary of South America
MAMMALS AND STRATIGRAPHY : GEOCHRONOLOGY OF THE CONTINENTAL MAMMAL·BEARING QUATERNARY OF SOUTH AMERICA by Larry G. MARSHALLI, Annallsa BERTA'; Robert HOFFSTETTER', Rosendo PASCUAL', Osvaldo A. REIG', Miguel BOMBIN', Alvaro MONES' CONTENTS p.go Abstract, Resume, Resumen ................................................... 2, 3 Introduction .................................................................. 4 Acknowledgments ............................................................. 6 South American Pleistocene Land Mammal Ages ....... .. 6 Time, rock, and faunal units ...................... .. 6 Faunas....................................................................... 9 Zoological character and history ................... .. 9 Pliocene-Pleistocene boundary ................................................ 12 Argentina .................................................................... 13 Pampean .................................................................. 13 Uquian (Uquiense and Puelchense) .......................................... 23 Ensenadan (Ensenadense or Pampeano Inferior) ............................... 28 Lujanian (LuJanense or Pampeano lacus/re) .................................. 29 Post Pampean (Holocene) ........... :....................................... 30 Bolivia ................ '...................................................... ~. 31 Brazil ........................................................................ 37 Chile ........................................................................ 44 Colombia -
Redalyc.Influence of Depositional Load on the Development of a Shortcut
Andean Geology ISSN: 0718-7092 [email protected] Servicio Nacional de Geología y Minería Chile Muñoz-Sáez, Carolina; Pinto, Luisa; Charrier, Reynaldo; Nalpas, Thierry Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene Oligocene Abanico Basin case, central Chile Andes (33°-35°S) Andean Geology, vol. 41, núm. 1, enero-, 2014, pp. 1-28 Servicio Nacional de Geología y Minería Santiago, Chile Available in: http://www.redalyc.org/articulo.oa?id=173929668001 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Andean Geology 41 (1): 1-28. January, 2014 Andean Geology doi: 10.5027/andgeoV41n1-a01 formerly Revista Geológica de Chile www.andeangeology.cl Influence of depositional load on the development of a shortcut fault system during the inversion of an extensional basin: The Eocene-Oligocene Abanico Basin case, central Chile Andes (33°-35°S) Carolina Muñoz-Sáez1, 5, *Luisa Pinto1, 2, Reynaldo Charrier1, 2, 3, Thierry Nalpas4 1 Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Casilla 13518, Correo 21, Santiago, Chile. [email protected] 2 Advanced Mining Technology Center (AMTC), Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Beauchef 850, Santiago. 3 Escuela de Ciencias de la Tierra, Universidad Andrés Bello, Campus República, República 230, Santiago. [email protected] 4 Géosciences Rennes, UMR CNRS 6118-Université de Rennes 1, Campus Beaulieu, 263 Avenue du General Leclerc, 35042 Rennes Cedex, France.