Results 1 to 10 of about 281 (131)

Diuqin lechiguanae gen. et sp. nov., a new unenlagiine (Theropoda: Paraves) from the Bajo de la Carpa Formation (Neuquén Group, Upper Cretaceous) of Neuquén Province, Patagonia, Argentina [PDF]

BMC Ecology and Evolution
Background Unenlagiine paravians are among the most relevant Gondwanan theropod dinosaur clades for understanding the origin of birds, yet their fossil record remains incomplete, with most taxa being represented by fragmentary material and/or separated ...
Juan D. Porfiri, Mattia A. Baiano, Domenica D. dos Santos, Federico A. Gianechini, Michael Pittman, Matthew C. Lamanna   +5 more
doaj   +2 more sources

The Earliest Known Radiation of Pitheciine Primates. [PDF]

Am J Primatol
Right mandible and dentition of the holotype of Soriacebus ameghinorum (MACN Pv SC2), from the Early Miocene of Patagonia, compared with the living Cacajao calvus (FMNH 88813, cast), both representing extinct and extant morphologies of the Pitheciinae: Procumbent and styliform incisors and projecting canines represent a morphological complex for ...
Novo NM, Martin GM, González Ruiz LR, Tejedor MF.   +3 more
europepmc   +2 more sources

Organic periostracum preserved in Cretaceous ammonoids from the Andean Neuquén Basin [PDF]

Communications Biology
Exceptionally preserved 135-million-year-old ammonoids from the Neuquén Basin at the Andean foothills revealed a fossilised structure never recorded before. Ammonoids are cephalopods that inhabited the oceans for about 400 million years until they became
Beatriz Aguirre-Urreta, Luciana S. Marin, Antonio G. Checa, Christian Grenier, Maisa Tunik, Marina Lescano, María A. Castro, Darío G. Lazo, Verónica V. Vennari, Martín N. Rogel   +9 more
doaj   +2 more sources

Body size and evolutionary rate analyses reveal complex evolutionary history of Alvarezsauria. [PDF]

Cladistics
Abstract Some of the smallest examples of dinosaurian body size are from alvarezsaurians, an enigmatic group of maniraptoran coelurosaurians with a peculiar combination of anatomical features unique among theropods. Despite the large number of alvarezsaurian species described worldwide and the increased understanding this has provided, the body‐size ...
Meso JG, Pol D, Chiappe L, Qin Z, Díaz-Martínez I, Gianechini F, Apesteguía S, Makovicky PJ, Pittman M.   +8 more
europepmc   +2 more sources

Lower Jurassic calcareous nannofossil taxonomy revisited according to the Neuquén Basin (Argentina) record [PDF]

Journal of Micropalaeontology, 2022
Standard Early Jurassic biostratigraphic studies were performed in the boreal and Tethys realms (western Europe and northern Africa), and biozonations from these areas are the most accurate of the world. Comparatively, investigations in the Pacific realm
M. Chaumeil Rodríguez, M. Chaumeil Rodríguez, E. Mattioli, E. Mattioli, J. P. Pérez Panera   +4 more
doaj   +1 more source

First Jurassic brittlestar from Neuquén Basin, Argentina [PDF]

Acta Palaeontologica Polonica, 2023
Articulated fossil ophiuroids from South America were reported for the Devonian, Cretaceous, Eocene, and Miocene. Here we report the first Jurassic record of an articulated ophiuroid from the Sierra Chacaicó Formation (early Pliensbachian– Sinemurian ...
DÉBORA M. CAMPETELLA, EVANGELINA E. PALÓPOLO, MAXIMILIANO N. RODRÍGUEZ, BEN THUY, JUAN J. PONCE, NOELIA B. CARMONA, SILVIO CASADÍO   +6 more
doaj   +1 more source

A new Late Triassic dipteridacean fern from the Paso Flores Formation, Neuquén Basin, Argentina [PDF]

Acta Palaeontologica Polonica, 2021
Sterile and fertile fronds of dipteridacean ferns from the Paso Flores Formation (late Norian–Rhaetian) at Cañadón de Pancho area, south of the Neuquén Province, Patagonia (Neuquén Basin), Argentina, are described.
SILVIA CRISTINA GNAEDINGER, ANA MARÍA ZAVATTIERI   +1 more
doaj   +1 more source

Taxonomic identification of the Megaloolithid egg and eggshells from the Cretaceous Bauru Basin (Minas Gerais, Brazil): comparison with the Auca Mahuevo (Argentina) titanosaurid eggs

Papéis Avulsos de Zoologia, 2007
The taxonomically (titanosaurid) identified eggs and eggshells of Auca Mahuevo (Patagonia, Argentina) provide an opportunity to compare and identify orphan megaloolithid eggs found elsewhere.
Gerald Grellet-Tinner, Hussam Zaher
doaj   +1 more source

FIRST TITHONIAN RECORD OF PERFORATED PEDIASTRUM MEYEN S.L. SPECIES WITHIN EARLY–DIAGENETIC CARBONATE CONCRETIONS FROM THE VACA MUERTA FORMATION, NEUQUÉN BASIN, ARGENTINA. IMPLICATIONS FOR THE PALYNOLOGICAL ANALYSIS OF FINE-GRAINED ROCKS

Publicación Electrónica de la Asociación Paleontológica Argentina, 2023
The perforated Pediastrum Meyen s.l. species are recorded for the first time in the basal levels of the Tithonian Vaca Muerta Formation, extending its first stratigraphical record to ages as old as Late Jurassic times.
Daniela Elizabeth Olivera, Marcelo Adrián Martínez, Germán Otharán, Luis Sebastián Agüero, Carlos Zavala   +4 more
doaj   +1 more source

Variability of continental depositional systems during lowstand sedimentation: an example from the Kimmeridgian of the Neuquen Basin, Argentina

Latin American Journal of Sedimentology and Basin Analysis, 2021
Several second order lowstand wedges are recognized in the Jurassic-Early Cretaceous sedimentary record of the backarc Neuquén Basin (central-west Argentina).
Luis A. Spalletti, Gonzalo D. Veiga
doaj   +2 more sources