Article
Plant Sciences
Theodore P. Matel, Maria A. Gandolfo, Elizabeth J. Hermsen, Peter Wilf
Summary: Two distinct types of fossil infructescences from the early Eocene Laguna del Hunco flora in Patagonia, Argentina, have been found to be affiliated with the family Cunoniaceae. The study reveals the evolutionary and biogeographical significance of these fossils and introduces two new fossil genera, Racemofructus and Cunoniocarpa, with affinities to tribes Cunonieae and Caldcluvieae respectively. These fossils, alongside other evidence from southern South America and Antarctica, suggest that Cunoniaceae were diversified and widely distributed in the southern hemisphere by the early Eocene period.
AMERICAN JOURNAL OF BOTANY
(2022)
Article
Multidisciplinary Sciences
Federico J. Degrange, Diego Pol, Pablo Puerta, Peter Wilf
Summary: The new fossil discovery of a stem-Coracii in the Early Eocene of South America indicates a wider distribution of this clade than previously hypothesized, already extending into the Southern Hemisphere.
SCIENTIFIC REPORTS
(2021)
Article
Plant Sciences
Sol Noetinger, Ines Aramendia, Roberto R. Pujana, Juan L. Garcia Massini, Viviana D. Barreda
Summary: This study estimates the age, paleoenvironment, and climatic conditions of the La Marcelina Formation in Southern Patagonia based on the analysis of terrestrially derived spores, algae cysts, and pollen grains. The findings suggest that the flora in this region during the Eocene consisted of a mixture of Gondwanan and Neotropical elements, dominated by Podocarpaceae, Nothofagaceae, and Proteaceae, and likely developed in a temperate and humid climate.
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
(2023)
Article
Geography, Physical
M. Sol Raigemborn, Sabrina Lizzoli, Ethan Hyland, Jennifer Cotton, Lucia E. Gomez Peral, Elisa Beilinson, J. Marcelo Krause
Summary: This study is of significant importance for understanding climatic changes in the Southern Hemisphere during the Eocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Chemistry, Analytical
Norah Salem Alsaiari, Muhammad Ahmad, Irum Shaheen, Ijaz Ali, Umay Amara, Fatimah Mohammed Alzahrani, Sayed M. Eldin, Waqas Ul Arifeen, Tae Jo Ko, Iftikhar Hussain
Summary: In this study, composites based on ZnO/NiO were successfully fabricated and exhibited high specific capacity and long stability as electrode materials for supercapacitors. The synthesized 3D flower-shaped ZnO/NiO composite was characterized using various techniques. The electrochemical measurements showed that the highest specific capacity of 350 C g-1 was achieved at 2 A g-1 current, while the lowest specific capacity of 217 C g-1 was observed at 20 A g-1. After 8000 GCD cycles, the 3D flower-shaped ZnO/NiO electrode demonstrated a cyclic stability of 72.1% capacitance retention and 97.1% Coulombic efficiency.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Geosciences, Multidisciplinary
Justin Gosses, Alan R. Carroll, Benjamin T. Bruck, Brad S. Singer, Brian R. Jicha, Eugenio Aragon, Andrew P. Walters, Peter Wilf
Summary: The Eocene Huitrera Formation in northwestern Patagonia, Argentina, is known for its diverse fossil biotas. Through new 40Ar/39Ar age determinations and analysis of different depositional environments, a better understanding of the age and significance of the fossil assemblages has been achieved. The findings provide valuable insights into South American mammal evolution, climate change, and geographic isolation.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geology
Thomas Martin, Francisco J. Goin, Julia A. Schultz, Javier N. Gelfo
Summary: This paper reports on the discovery of rare Cretaceous animal teeth fragments in Santa Cruz province, Argentina, revealing new records of docodontans, Cretaceous australosphenidans, and stem dryolestids in South America. These fossils may provide important clues for understanding faunal interrelationships between Australia and South America during the late Early/early Late Cretaceous.
CRETACEOUS RESEARCH
(2022)
Article
Geology
Carolina Acosta Hospitaleche, Jose P. OGorman, Karen M. Panzeri
Summary: A fossil of a left ulna found in the southeastern margin of the Somun Cura Plateau, Chubut Province (Argentina) is suggested to belong to a possible new species of neornithine bird. This could be the first report of a neornithine bird from the La Colonia Formation if correctly identified.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Gerardo Alvarez Herrera, Federico Agnolin, Sebastian Rozadilla, Gaston E. Lo Coco, Makoto Manabe, Takanobu Tsuihiji, Fernando E. Novas
Summary: In this study, researchers describe a new enantiornithine bird fossil, Yatenavis ieujensis, which represents one of the youngest occurrences of this group in the Upper Cretaceous. The specimen, a distal half of a right humerus, was discovered in southern Santa Cruz Province, Argentina, and is the southernmost enantiornithine fossil found to date. Yatenavis possesses unique characteristics, some of which are shared with an unnamed enantiornithine from another fossil site in Patagonia.
CRETACEOUS RESEARCH
(2023)
Article
Biology
Barbara Vera, Alvaro Mones
Summary: This study re-examines the Henricosborniidae in the native South American fauna, providing updates on the systematic status and diagnoses of Othnielmarshia and Peripantostylops, as well as comparisons with other related taxa and proposing synonymies. It also highlights the variability in certain controversial characters of henricosborniids, which should be evaluated for the definition of the group.
HISTORICAL BIOLOGY
(2023)
Article
Biology
A. Piro, C. Acosta Hospitaleche
Summary: Based on the characteristics of the carpometacarpus fossil, it is preliminarily determined to belong to the family Procellariidae, possibly representing a new genus and species. Further confirmation of this discovery will require more complete specimens.
HISTORICAL BIOLOGY
(2022)
Article
Environmental Sciences
Santiago I. Hurtado, Martin Calianno, Santino Adduca, Marcos H. Easdale
Summary: In the last few decades, the northern Patagonia region in Argentina has experienced a shift towards drier conditions, with decreasing precipitation and increasing temperatures. This has resulted in reduced streamflows in the Neuquen and Chubut rivers. The earlier onset of the second streamflow peak and the decline in spring streamflow highlight the importance of adapting water management strategies to meet summer-autumn water demands.
REGIONAL ENVIRONMENTAL CHANGE
(2023)
Article
Evolutionary Biology
Agostina Ferro, Daniel A. Garcia-Lopez, Luis S. Saade, Pablo J. Alonso-Muruaga, Agustin Scanferla
Summary: In this study, a new species of notoungulate, Pascualhyrax irqi sp. nov., is described based on cranial and dental remains from Eocene sediments in north-western Argentina. The new taxon shows close relationship with typotherian taxa traditionally included among the paraphyletic 'Archaeohyracidae', but also exhibits unique characters that distinguish it as a new species. Phylogenetic analysis reveals its close relationship with Oligocene 'Archaeohyracidae', indicating the expression of early characters found in later forms and the diversity of hypsodont typotherians in the region.
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Fabrice Lihoreau, Raphael Sarr, Domininique Chardon, Jean-Renaud Boisserie, Renaud Lebrun, Sylvain Adnet, Jeremy E. Martin, Laurent Pallas, Bernard Sambou, Rodolphe Tabuce, Mohamadou M. Thiam, Lionel Hautier
Summary: Early Pliocene hominin evolutionary scenarios have mainly been based on paleontological investigations in eastern Africa, but the discovery of the Tobene fauna in Senegal expands the Pliocene vertebrate continental fossil record to western Africa. Fossil remains of large mammals from the Tobene fauna suggest an early Pliocene age and highlight the need for continent-wide paleontological investigations for possible faunal correlations with eastern African localities.
Article
Plant Sciences
Mariana Brea, Ari Iglesias, Peter Wilf, Eliana Moya, Maria A. Gandolfo
Summary: This study presents a detailed anatomical description of a new species of the Winteraceae genus Winteroxylon from a well-preserved trunk fossil in Patagonia, Argentina. The fossil wood shares similarities with extant genera in Australasian and Malesian rainforests, particularly the genus Bubbia. It is the first reliable macrofossil record of Winteraceae from South America and supports the abundant palynological record of the family on the continent.
INTERNATIONAL JOURNAL OF PLANT SCIENCES
(2021)
Article
Zoology
Martin R. Ciancio, Emma C. Vieytes, Mariela C. Castro, Alfredo A. Carlini
Summary: The study analyzed the enamel microstructure in four Dasypus species, revealing variations in enamel morphology among different species and a trend of gradual reduction of enamel during evolution.
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
(2021)
Article
Zoology
Laura Chornogubsky
Summary: Polydolopidae is a family of Palaeogene marsupials found in outcrops in southern South America and the Antarctic Peninsula. Through taxonomic revision and phylogenetic analysis, new genera and species within the family have been identified. The family appeared in the early Palaeocene and went extinct during the Early Oligocene, possibly due to climatic deterioration.
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
(2021)
Editorial Material
Paleontology
German Barmak, Laura Chornogubsky, Leandro C. Gaetano
Article
Evolutionary Biology
Juan Carlos Fernicola, Ana N. Zimicz, Laura Chornogubsky, Mihai Ducea, Laura E. Cruz, Mariano Bond, Michelle Arnal, Magali Cardenas, Mercedes Fernandez
Summary: Recent research has identified the basal beds of the lower section of the Lumbrera Formation as early Eocene deposits dating between 55-46.2 Ma, based on a succession of hyperthermal events. The study also presents one of the oldest cingulate assemblages in America from the early Eocene hyperthermal period, indicating an early diversification of the Cingulata during the Paleocene.
JOURNAL OF MAMMALIAN EVOLUTION
(2021)
Article
Geography, Physical
Andres Alfonso-Rojas, Laura M. Herrera-Gutierrez, Catalina Suarez, MartiN R. Ciancio, Jonathan S. Pelegrin, Edwin-Alberto Cadena
Summary: Pubenza in Colombia is a significant palaeontological site with findings of small animals including birds, turtles, and vipers, indicating a rich Late Pleistocene ecosystem. The discovery of well-preserved wasp nests and new material of various animals makes it a region of great interest for future research in palaeontology and archaeology.
JOURNAL OF QUATERNARY SCIENCE
(2021)
Article
Paleontology
Francois Pujos, Martin R. Ciancio, Analia M. Forasiepi, Michel Pujos, Adriana M. Candela, Barbara Vera, Marcelo A. Reguero, Ana Maria Combina, Esperanza Cerdeno
Summary: The late Oligocene mammalian fauna of Quebrada Fiera is diverse, featuring 13 endemic xenarthran species including sloths and armoured cingulates. The vertebrate fauna suggests a mix of endemic and high latitude species, indicating a varied ecosystem under a temperate or hot climate in late Oligocene South America.
PAPERS IN PALAEONTOLOGY
(2021)
Article
Geology
Thomas Martin, Francisco J. Goin, Julia A. Schultz, Javier N. Gelfo
Summary: This paper reports on the discovery of rare Cretaceous animal teeth fragments in Santa Cruz province, Argentina, revealing new records of docodontans, Cretaceous australosphenidans, and stem dryolestids in South America. These fossils may provide important clues for understanding faunal interrelationships between Australia and South America during the late Early/early Late Cretaceous.
CRETACEOUS RESEARCH
(2022)
Article
Biology
Natalia Zimicz, M. Fernandez, M. Bond, L. Chornogubsky, J. C. Fernicola
Summary: A new remain of a SANU, named Kyraodus churcalensis gen. et. sp nov., is described from the lower levels of the Lumbrera Formation. It possesses distinct features such as brachydont and bunodont molars, a larger talonid compared to the trigonid, and an intact distal wall of the metaconid. Cladistic analysis revealed its position within a clade including Mioclaenidae, Litopterna, Didolodontidae, and Phenacodontidae, separate from Notoungulata plus Kollpaniidae. This study highlights the significance of Northwestern Argentina for the early radiation of native ungulates.
HISTORICAL BIOLOGY
(2023)
Article
Biology
Carolina Acosta Hospitaleche, Javier N. Gelfo, Bruno Quaggia, Marcelo Reguero
Summary: This study presents the results of excavations and analyses of two abandoned rookeries in the South Shetland Islands, West Antarctica. The findings provide insights into the taxonomic composition, transport and preservation of bones and eggshells, and inform the reconstruction of past nesting areas.
HISTORICAL BIOLOGY
(2023)
Article
Evolutionary Biology
Mercedes Fernandez, Ana N. Zimicz, Mariano Bond, Laura Chornogubsky, Nahuel A. Munoz, Juan C. Fernicola
Summary: We describe a new genus and species of Pyrotheria, Berracotherium koimeterion, from the Quebrada de Los Colorados Formation in Argentina. This new taxon is based on a mandibular fragment with erupting teeth and can be differentiated from other pyrotheres by several unique characteristics. A cladistic analysis places Berracotherium gen. nov. within the Pyrotheriidae family, along with other genera such as Griphodon, Propyrotherium, Baguatherium, and Pyrotherium. The discovery of Berracotherium koimeterion gen. et sp. nov. expands the known diversity and distribution of Pyrotheria at both regional and global scales.
JOURNAL OF MAMMALIAN EVOLUTION
(2023)
Article
Evolutionary Biology
Juan S. Salgado-Ahumada, Marcos D. Ercoli, Alicia Alvarez, Mariela C. Castro, Martin R. Ciancio
Summary: Cingulata (Mammalia, Xenarthra) is a conspicuous clade in the Cenozoic fossil record of South America, and geometric morphometric analysis is applied to assess shape variation of Dasypodini osteoderms in order to identify fragmentary fossil remains. The results confirm the taxonomic assignments of fossil Dasypodini osteoderms and extend the biochron of Dasypus by at least 3 million years.
JOURNAL OF MAMMALIAN EVOLUTION
(2023)
Article
Biology
Laura Chornogubsky, Francisco J. J. Goin, Martin R. Ciancio, Pablo Puerta, Marcelo Krause
Summary: In this study, new materials collected from the pink sandstone levels of the Las Flores Formation in Cerro Pan de Azucar, Argentina, were compared with similar-aged localities. The research identified new species of Metatheria taxa including Sternbergiidae indet, Protodidelphis cf. mastodontoides and Guggenheimia glykeia sp. nov. (Didelphimorphia), Pliodolops rothi and Pliodolops cf. kamektsen (Polydolopimorphia), and Eomicrobiotherium diluculum sp. nov. (Microbiotheria). The Astegotheriini Prostegotherium astrifer was also identified as a representative of the Dasypodidae. The faunal associations in the study area were found to be similar to Paso del Sapo and Itaboraian fauna, suggesting synchrony and age between 51 to 45 Ma (early Ypresian- early Lutetian).
HISTORICAL BIOLOGY
(2023)
Review
Paleontology
Arnaud Begat, Juergen Kriwet, Javier N. Gelfo, Soledad Gouiric Cavalli, Julia A. Schultz, Thomas Martin
Summary: A new extinct sclerorhynchoid sawfish, Ptychotrygon ameghinorum sp. nov., is described in this study. The findings of abundant fossil materials suggest a wider distribution range than previously thought. The research also suggests that Ptychotrygon might have originated in southwestern Europe and subsequently dispersed during the Cenomanian, with a shift in distribution from Europe to North America during the Coniacian period.
JOURNAL OF VERTEBRATE PALEONTOLOGY
(2022)
Article
Multidisciplinary Sciences
Nelson Martin Novo, Marcelo Fabian Tejedor, Laureano Raul Gonzalez-Ruiz, John G. Fleagle, Diego Brandoni, Marcelo Krause
Summary: This study presents ten new dental specimens of primates from the early Miocene Pinturas Formation in Patagonia, Argentina. The specimens belong to known taxa from the formation and offer new morphological information, including similarities to known species and the need for further determination of affinities.
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
(2021)
Article
Evolutionary Biology
Gaston Martinez, Maria T. Dozo, Javier N. Gelfo, Martin R. Ciancio, Rolando Gonzalez-Jose
Summary: The article discusses the diversity and monophyly of Notoungulates, with a focus on a new discovered toxodont. Through phylogenetic analysis, a new taxon closely related to traditionally classified 'Notohippidae' is proposed, and a new clade named Eutoxodontia is suggested to accurately define middle and later diverging toxodonts, aiming to contribute to the stabilization of toxodontian taxonomy.
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2021)