Publicación Electrónica de la Asociación Paleontológica Argentina
type: channel
description: PUBLICACIÓN ELECTRÓNICA DE LA ASOCIACIÓN PALEONTOLÓGICA ARGENTINA (PE-APA) is an open access electronic journal, whose articles are made freely and permanently accessible online immediately upon publication. PE-APA publishes original scientific papers in english or spanish, that cover a wide range of topics within paleontology, including but not limited to anatomy, systematics, taxonomy, phylogeny, paleobiology, paleoecology, paleobiogeography, biostratigraphy, and taphonomy. Methodological work with applications in paleontology is also welcomed, as well as geological articles related to paleontology. The journal also publishes Thematic Volumes dedicated to developing specific topics, focusing on areas of high impact and broad interest within palaeontology. These will be subject to prior consideration by the PE-APA management team. Complete papers from scientific events (e.g. conference proceedings) are also accepted (see submission guidelines here). Manuscripts primarily focusing on geology and history must be closely related to palaeontology and will be subject to prior consideration by the editors. PE-APA is indexed in SCOPUS, LATINDEX, REDIB (Red Iberoamericana de Innovación y Conocimiento Científico), DOAJ (Directory of Open Acces Journals) and PERIÓDICA (Indice de Revistas Latinoamericanas en Ciencias). PE-APA is part of the Núcleo Básico de Revistas Científicas Argentinas. <img src="[binary]" />
publisher: Asociación Paleontológica Argentina
language: en
publication name: Publicación Electrónica de la Asociación Paleontológica Argentina
issn: 2469-0228
copyright: Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Atribución/Reconocimiento 4.0 Internacional that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
items: A NEW SPECIES OF CELLARIA (BRYOZOA, CHEILOSTOMATIDA) FROM THE LATE DANIAN (PALEOCENE) OF PATAGONIA (ARGENTINA)
items: https://peapaleontologica.org.ar/index.php/peapa/article/view/548
items: TAPHONOMY OF DEATH ASSEMBLAGES OF THE FRESHWATER BIVALVE CORBICULA FLUMINEA (MÜLLER, 1774) (VENEROIDEA) AFTER THREE AND FOUR DECADES IN THE UPPER RÍO DE LAPLATA, URUGUAY
items: TAPHONOMY AND GENESIS OF SHELL LENSES: THE CERRO BANDURRIAS LOCALITY (TIERRA DEL FUEGO, ARGENTINA)
items: SILICEOUS MICROFOSSILS IN THE CALCAREOUS PALEOSOLS FROM FLUVIAL-EOLIAN DEPOSITS OF THE ANGASTACO FORMATION (OLIGOCENE–MIOCENE), SALTA PROVINCE, ARGENTINA
items: NEW TRAVERSODONTID CYNODONT FROM THE LATE TRIASSIC CHAÑARES FORMATION
items: THE RISE OF ACTUALISTIC TAPHONOMY IN SOUTH AMERICA
items: RECURRENT DEATHS OF GUANACOS (LAMA GUANICOE) DUE TO WINTER STRESS IN SOUTHERN PATAGONIA: AVERAGED SAMPLES AND CHANGE OF ANALYSIS SCALES
items: Libro de Resúmenes de la Reunión de Comunicaciones de la Asociación Paleontológica Argentina 2024
items: ENVIRONMENTAL HISTORY FOR THE LAST TWO MILENNIA IN THE CENTRAL ARGENTINEAN PAMPA PLAIN: A PALEOLIMNOLOGICAL APPROACH
items: WHO EATS THE ARMADILLOS? NEOTAPHONOMY OF ACCUMULATIONS PRODUCED BY THE CROWNED EAGLE (BUTEOGALLUS CORONATUS)
items: 4th Annual Meeting of the IGCP 735
items: ORNITÓPODOS BASALES DEL CENTRO-SUR DE CHUBUT, PATAGONIA CENTRAL: CONSIDERACIONES EVOLUTIVAS, PALEOHISTOLÓGICAS Y PALEOAMBIENTALES
items: FROM BURMEISTER TO AMEGHINO AND THE WORLDWIDE RECOGNITION OF THE VERTEBRATE PALEONTOLOGY FROM ARGENTINA
items: CETOTHERIIDAE RECORDS FROM THE LATE MIOCENE OF PATAGONIA EXPAND THE DIVERSITY OF BALEEN WHALES FROM THE SOUTHWESTERN ATLANTIC OCEAN
items: Book of Abstracts of the XXXVII Argentine Meeting of Vertebrate Paleontology
items: MORPHOLOGY AND PALEOECOLOGY OF THE LATE PLEISTOCENE EXTINCT DUNG BEETLE ONTHOPHAGUS PILAUCO (COLEOPTERA, SCARABAEIDAE, ONTHOPHAGINI)
items: CONTRIBUTION TO THE KNOWLEDGE OF THE FOSSIL FUNGI RECORD BASED ON PALYNOMYCOLOGICAL STUDIES FROM THE EL FOYEL GROUP, ÑIRIHUAU BASIN, PALEOGENE FROM PATAGONIA ARGENTINA
items: THE FIRST EOCENE BIRD FROM NORTHWESTERN ARGENTINA
items: A MESOZOIC DINO-FEAST: MULTIPLE TEETH MARKS ON A SAUROPOD DINOSAUR BONE FROM THE UPPER CRETACEOUS OF PATAGONIA AND EVIDENCE ON THEROPOD FEEDING BEHAVIOR
items: THE RÍO LORO FORMATION (PALEOGENE, NORTHWESTERN ARGENTINA) AND ITS UNIQUE VERTEBRATE FAUNA: EXPLORING PALEOENVIRONMENTAL AND PALEOECOLOGICAL ASPECTS
items: ON THE HOLOTYPE OF CAENOPHILUS TRIPARTITUS AMEGHINO, 1903 (INTERATHERIIDAE, NOTOUNGULATA): REVISION AND CLARIFICATION REGARDING ITS GEOGRAPHIC AND STRATIGRAPHIC PROVENANCES
items: The Family Olenidae (Trilobita, Arthropoda): A synopsis of its taxonomic composition, stratigraphic and paleogeographic distribution
items: THE ORDOVICIAN CONODONT TRIPODUS LAEVIS BRADSHAW, 1969: ITS TAXONOMIC VALIDITY AND BIOSTRATIGRAPHIC VALUE IN THE ARGENTINE PRECORDILLERA
items: GRAPTOLITES FROM THE NORTHWESTERN ARGENTINA OF THE “LOSS COLLECTION”: TAXONOMY, AGE, AND CORRELATION
items: CONTRIBUTION OF PHYTOLITH RECORDS TO THE PALEOENVIRONMENTAL RECONSTRUCTION OF THE LATE HOLOCENE IN THE SANTA MARÍA VALLEY (TUCUMÁN - ARGENTINA)
items: Abstracts Book of the Reunión de Comunicaciones de la Asociación Paleontológica Argentina 2023
items: WIDER PALEOGEOGRAPHICAL DISTRIBUTION OF BOTHREMYDID TURTLES IN NORTHERN SOUTH AMERICA DURING THE PALEOCENE–EOCENE
items: https://peapaleontologica.org.ar/index.php/peapa/article/view/493
items: THE FORMATION PROCESS OF THE AMEGHINO’S ARCHAEOLOGICAL COLLECTION PRESENTED IN PARIS IN1878: COMPOSITION, CATALOGING, AND DESTINATION

A NEW SPECIES OF CELLARIA (BRYOZOA, CHEILOSTOMATIDA) FROM THE LATE DANIAN (PALEOCENE) OF PATAGONIA (ARGENTINA)
type: item
description: The cheilostome bryozoan genus Cellaria is characterized by articulated, dichotomously branching colonies, which are composed of cylindrical internodes joined by cuticular nodes. The genus includes over 130 species, with approximately 70 taxa ranging from the late Paleocene to the Holocene. This study describes Cellaria daniana sp. nov., based on material collected from the Roca Formation, upper Danian (Paleocene) of northern Patagonia, Argentina, making it the earliest known occurrence of the genus. The most distinctive feature of C. daniana sp. nov. is its vicarious avicularium, which lacks mandibular pivots and exhibits a distally depressed cryptocyst, resembling that of C. stachi from the Eocene of Victoria, Australia. Cellaria stachi shows a great morphological similarity with C. daniana sp. nov., supporting a close biogeographic connection between South America and Australasia during the Early Cenozoic.
subject: Articles
  topic: section
subject: Roca Formation
  topic: keywords
subject: Neuquén Basin
  topic: keywords
subject: Río Negro Province
  topic: keywords
subject: Danian
  topic: keywords
subject: Marine invertebrates
  topic: keywords
subject: Bryozoan
  topic: keywords
subject: Palaeoinvertebrates
  topic: disciplines
subject: Systematics
  topic: disciplines
subject: Taxonomy
  topic: disciplines
creator: Juan López-Gappa
creator: Débora Iturra
creator: Leandro M. Pérez
creator: Egly Pérez Pincheira
creator: Alberto C. Garrido
rights: Copyright (c) 2025 Juan López-Gappa, Débora Iturra, Leandro M. Pérez, Egly Pérez Pincheira, Alberto C. Garrido https://creativecommons.org/licenses/by-nd/4.0
date: 2025-11-06
publication date: 2025-11-06
starting page: 183
ending page: 190
doi: 10.5710/PEAPA/30.09.2025.550

https://peapaleontologica.org.ar/index.php/peapa/article/view/548
type: item
title: KEROGEN CHARACTERIZATION OF THE VACA MUERTA FORMATION (TITHONIAN–VALANGINIAN), AT MALLÍN QUEMADO AND PUERTA CURACO, NEUQUÉN BASIN, CENTRAL-WEST PATAGONIA, ARGENTINA. PALYNOFACIES AND GEOCHEMICAL APPROACH
description: This contribution integrates palynofacies, organic geochemical and sedimentological analyses to characterize the depositional environment and the kerogen properties related to the hydrocarbon source potential of the Vaca Muerta Formation at the Mallín Quemado Norte (MQN) and Puerta Curaco (PC), Neuquén Basin, Argentina. Thirty-five outcrop samples were analyzed for palynofacies and total organic carbon (TOC). At MQN, five palynofacies types and sedimentological evidence suggest deposition mainly in an outer shelf marine environment with a variable continental input. At PC, three palynofacies types and sedimentological observations point to accumulation mainly in an outer ramp marine environment with minimal to moderate terrigenous input. Depositional processes involve an interplay of suspension settling from the water column (marine snow) and buoyant plumes, followed by reworking of the seafloor by bottom currents and sediment gravity flows. Under identical hydrodynamic flow conditions, equidimensional phytoclasts respond better to transport sorting than blade-shaped. The first documentation of high-relief organic spheres (HROS) in this unit points to redox oscillation between sulfidic and ferruginous anoxic microenvironments during early diagenesis. Low HROS percentages and crypto-bioturbated strata suggest that bottom waters were not strictly anoxic. Organic carbon preservation may be partly related to the role of extracellular polymeric substances as an organic matter encapsulator. The kerogen aligns with type III-IV, and TOC values are mainly high (MQN: up to 4.69%; PC: 4.9–10.4%). Although an over-mature state cannot be entirely ruled out (highly dark palynological matter), the poor preservation of the kerogen suggests a negligible hydrocarbon potential.
subject: Articles
  topic: section
subject: Vaca Muerta Formation
  topic: keywords
subject: Kerogen
  topic: keywords
subject: Palynofacies analysis
  topic: keywords
subject: Total organic carbon
  topic: keywords
subject: Paleoenvironment
  topic: keywords
subject: Hydrocarbon source potential
  topic: keywords
subject: Palynology
  topic: disciplines
subject: Organic Geochemistry
  topic: disciplines
creator: Luis Sebastián Agüero
creator: Daniela Elizabeth Olivera
creator: Marcelo Adrián Martínez
creator: Germán Otharán
rights: Copyright (c) 2025 Luis Sebastián Agüero, Daniela Elizabeth Olivera, Marcelo Adrián Martínez, Germán Otharán https://creativecommons.org/licenses/by-nd/4.0
date: 2025-11-03
publication date: 2025-11-03
starting page: 155
ending page: 182
doi: 10.5710/PEAPA.09.09.2025.548

TAPHONOMY OF DEATH ASSEMBLAGES OF THE FRESHWATER BIVALVE CORBICULA FLUMINEA (MÜLLER, 1774) (VENEROIDEA) AFTER THREE AND FOUR DECADES IN THE UPPER RÍO DE LAPLATA, URUGUAY
type: item
description: The invasive bivalve Corbicula fluminea has been known in the Río de la Plata for approximately 40 years. This decadal time lapse fill a gap in taphonomic studies. Our study is the second to investigate taphonomic modifications on valves of this species in Uruguay, expanding the temporal resolution of the first. We divided the valve into four sectors and recorded fragmentation, periostracum loss, and corrasion, categorizing these attributes into three severity levels. We also observed no attempts at bioerosion and bioencrustation. The central sector is the most frequent among all samples, and the posterior one is the least frequent. The differences in damage were tested using the X2 test, the Bonferroni correction, and an average taphonomic score. We evaluated the extent of taphonomic damage over time by comparing the average taphonomic score using Kendall’s tau. The tests revealed several statistically significant differences. The umbonal and posterior sectors are differently represented, with the 2008 sample being different in both cases. The central and anterior sectors do not exhibit differences. Fragmentation exhibits differences in all sectors except the anterior over the years; category 0 is the most represented in all years and sectors. Periostracum damage shows no statistically significant differences in sectors or years; category 2 is the most represented. Corrasion differs among the three samples, varying over the years in different sectors; category 2 is the most represented. In conclusion, there are statistically significant differences in the sectors represented and in fragmentation. However, no linear trend was observed over the years.
subject: Thematic Volume
  topic: section
subject: Actualistic Taphonomy
  topic: keywords
subject: Death assemblage
  topic: keywords
subject: Corbicula fluminea
  topic: keywords
subject: Río de la Plata
  topic: keywords
subject: Uruguay
  topic: keywords
subject: Taphonomy
  topic: disciplines
creator: Sergio Martínez
creator: Alejandra Rojas
creator: María Cecilia Gómez
rights: Copyright (c) 2025 Sergio Martínez, Alejandra Rojas, María Cecilia Gómez https://creativecommons.org/licenses/by-nd/4.0
date: 2025-10-20
publication date: 2025-10-20
starting page: 107
ending page: 117
doi: 10.5710/PEAPA.16.07.2025.538

TAPHONOMY AND GENESIS OF SHELL LENSES: THE CERRO BANDURRIAS LOCALITY (TIERRA DEL FUEGO, ARGENTINA)
type: item
description: This paper presents the taphonomic and geoarchaeological study of a thin shell lens identified 3.2 km from the coast of San Sebastian Bay on the hilltop of the inland Cerro Bandurrias archaeological locality (Tierra del Fuego Province, Argentina). The biological assemblage of the shell lens comprises marine fauna (bivalves, gastropods, and fish) that may represent the remains of the occasional exploitation of littoral resources by hunter gatherers. However, since the lack of unequivocal anthropogenic signals, alternative non-anthropogenic hypotheses need to be also assessed. Indeed, the time frame of the shell lens (radiocarbon dated as ~6500 cal. years BP) indicates that the bioclast accumulation occurred during the Middle Holocene marine transgression with a different paleogeography, when the hill was part of a coastal landform (peninsula). The methodological design comprised the combination of different and independent sources of information and the techniques applied to assess competing genetic hypotheses. Based on compositional, taphonomic and sedimentological analyses, our research suggests that the most parsimonious explanation is that hunter gatherers were the primary agents of bioclast accumulation of the lens. Thus, this ephemeral archaeological evidence provides a new record for the human exploitation of littoral resources on the Atlantic coast of Isla Grande de Tierra del Fuego during the Middle Holocene. The conspicuous character of shells improves the archaeological visibility of short term, nonredundant past human occupations.
subject: Thematic Volume
  topic: section
subject: Archaeomalacology
  topic: keywords
subject: Geoarchaeology
  topic: keywords
subject: Actualistic taphonomy
  topic: keywords
subject: Hunter-gatherers
  topic: keywords
subject: Middle Holocene marine transgression
  topic: keywords
subject: Coastal evolution
  topic: keywords
subject: Littoral human occupations
  topic: keywords
subject: Ephemeral archaeological record
  topic: keywords
subject: Taphonomy
  topic: disciplines
subject: Zooarchaeology
  topic: disciplines
creator: Karen Borrazzo
creator: Luis Alberto Borrero
creator: Ivana Laura Ozán
creator: María Victoria Parise
creator: Gabriela Lorena L'Heureux
rights: Copyright (c) 2025 Karen Borrazzo, Luis Alberto Borrero, Ivana Laura Ozán, María Victoria Parise, Gabriela Lorena L'Heureux https://creativecommons.org/licenses/by-nd/4.0
date: 2025-10-20
publication date: 2025-10-20
starting page: 84
ending page: 106
doi: 10.5710/PEAPA.15.07.2025.545

SILICEOUS MICROFOSSILS IN THE CALCAREOUS PALEOSOLS FROM FLUVIAL-EOLIAN DEPOSITS OF THE ANGASTACO FORMATION (OLIGOCENE–MIOCENE), SALTA PROVINCE, ARGENTINA
type: item
description: This work reports the first occurrence of siliceous microfossils in the Angastaco Formation (upper Oligocene–Upper Miocene) in the Salta Province, Argentina. Two samples were collected from the Quebrada Escalera section to conduct a prospective analysis for phytoliths in paleosols, aiming to infer paleovegetation and paleoenvironmental conditions. The sedimentary succession comprises ephemeral sheet-like fluvial deposits and fluvial-eolian interaction deposits with calcareous paleosol development on eolian dunes. The microfossil analysis revealed multicellular and unicellular phytoliths, diatom frustules, chrysostomataceae stomatocysts, cutinous epidermal fragments, carbonised microremains, and sponge spicules. The samples showed varied abundances of autochthonous microremains suggesting different hydrological conditions. Sample 2550, with abundant diatoms and stomatocysts, indicates a lentic water environment while sample 2551, rich in sponge spicules, suggests higher energy conditions. The phytolith assemblage, including Poaceae, Cyperaceae, and Arecaceae indicates wet interdune and/or extradune areas.
subject: Articles
  topic: section
subject: Phytoliths
  topic: keywords
subject: Andean foreland basin
  topic: keywords
subject: Fluvial-eolian deposits
  topic: keywords
subject: Micromorphology
  topic: keywords
subject: Sedimentology
  topic: disciplines
subject: Micropaleontology
  topic: disciplines
creator: Nahuel Espinoza
creator: Alejandro Zucol
creator: Cecilia del Papa
creator: Ricardo Nestor Melchor
rights: Copyright (c) 2025 Nahuel Espinoza, Alejandro Zucol, Cecilia del Papa, Ricardo Nestor Melchor https://creativecommons.org/licenses/by-nd/4.0
date: 2025-08-13
publication date: 2025-08-13
starting page: 39
ending page: 48
doi: 10.5710/PEAPA.25.06.2025.546

NEW TRAVERSODONTID CYNODONT FROM THE LATE TRIASSIC CHAÑARES FORMATION
type: item
description: The Chañares Formation in north-western Argentina has provided an impressive number of specimens of early archosauriforms, dicynodonts, and non-mammaliamorph cynodonts. However, there is a very low diversity of cynognathian cynodonts. Herein, we report on Pontognathus ignotus gen. et sp. nov., a small new traversodontid from the traditional Late Triassic Carnian levels of the unit. It differs from other traversodontids for lacking a maxillary platform lateral to the posterior postcanines and by presenting a unique combination of characters from the premaxilla, maxilla, and dentition (i.e., the precanine diastema; the placement of the paracanine fossa; the number of upper postcanines; the general outline of the upper postcanines crown in occlusal view; the shouldering between adjacent teeth; the expansion of the crown distolateral to the sectorial crest; the extension, limits and deepness of the occlusal basin; the distal ridge-like bulging at the base of the crown; the number and relative placement and development of the cusps). It is a relatively small taxon inferred to have occupied a specialized, small herbivorous/omnivorous role, which in this fauna is otherwise only shared by small individuals of the traversodontid Massetognathus pascuali.
subject: Articles
  topic: section
subject: Anatomy
  topic: keywords
subject: Cynodontia
  topic: keywords
subject: Traversodontid
  topic: keywords
subject: Gondwana
  topic: keywords
subject: Late Triassic
  topic: keywords
subject: Carnian
  topic: keywords
subject: Vertebrate Paleontology
  topic: disciplines
subject: Anatomy
  topic: disciplines
subject: Systematics
  topic: disciplines
creator: Leandro Carlos Gaetano
creator: Fernando Abdala
creator: Adriana Cecilia Mancuso
creator: Nahuel Vega
rights: Copyright (c) 2025 Leandro Carlos Gaetano, Fernando Abdala, Adriana Cecilia Mancuso, Nahuel Vega https://creativecommons.org/licenses/by-nd/4.0
date: 2025-09-03
publication date: 2025-09-03
starting page: 49
ending page: 67
doi: 10.5710/PEAPA.01.08.2025.540

THE RISE OF ACTUALISTIC TAPHONOMY IN SOUTH AMERICA
type: item
description: Over the past four decades, global actualistic taphonomy studies have grown significantly, driven by increased interest in present day patterns and processes of fossilization. South America has mirrored this trend, though the exact growth level is unclear. This study compiles actualistic taphonomy research in South America based on internationally accessible journal articles and book chapters using databases such as Web of Science, ResearchGate, Google Scholar, and Academia. Results revealed a steady rise in studies from 1985, with Argentina leading, followed by Brazil, Uruguay, and a few other countries with lesser representation. Terrestrial environments have seen the most extensive research, largely due to archaeologists and vertebrate paleontologists, with marine environments (mainly mollusk-based studies) following. Freshwater actualistic taphonomy began in 2006 and was the next most commonly represented, while estuarine and lagoonal environments were the least studied. Most research has been naturalistic: examining taphonomic patterns, taphofacies, live-dead fidelity, and time-averaging. However, experimental studies increased markedly after 2009. Synthesis papers appeared from 2007, reflecting the growing body of literature. Archaeological studies have been the most prolific, with vertebrate studies dominating the region’s actualistic taphonomy literature, followed by research on mollusks and lithics. Brachiopods, foraminifera, diatom, pollen, and phytoliths have developed less. Several groups, including plants, arthropods, worms, lichens, charcoal, pottery, rock art paintings, and sediments, remained poorly studied, highlighting the need for further research. This review underscores the significant progress made in South American actualistic taphonomy but also points to underrepresented environments and taxonomic groups that should be addressed in future studies.
subject: Thematic Volume
  topic: section
subject: Naturalistic studies
  topic: keywords
subject: Experimental studies
  topic: keywords
subject: Multidisciplinary
  topic: keywords
subject: Environmental diversity
  topic: keywords
subject: Geographical distribution
  topic: keywords
subject: Taphonomy
  topic: disciplines
creator: Claudio Germán De Francesco
creator: Fernando Miguel Archuby
creator: Karen Borrazzo
creator: Luis Alberto Borrero
creator: María A. Gutiérrez
creator: Gabriela S. Hassan
creator: Sergio Agustín Martínez
creator: Claudia Inés Montalvo
creator: Matias do Nascimento Ritter
rights: Copyright (c) 2025 Claudio Germán De Francesco, Fernando Miguel Archuby, Karen Borrazzo, Luis Alberto Borrero, María A. Gutiérrez, Gabriela S. Hassan, Sergio Agustín Martínez, Claudia Inés Montalvo, Matias do Nascimento Ritter https://creativecommons.org/licenses/by-nd/4.0
date: 2025-10-20
publication date: 2025-10-20
starting page: 68
ending page: 83
doi: 10.5710/PEAPA.24.07.2025.542

RECURRENT DEATHS OF GUANACOS (LAMA GUANICOE) DUE TO WINTER STRESS IN SOUTHERN PATAGONIA: AVERAGED SAMPLES AND CHANGE OF ANALYSIS SCALES
type: item
description: Actualistic taphonomic observations of guanaco carcasses resulting from two winter mass death events that occurred in 2020 and 2023 at various locations in the Coyle-Gallegos River interfluve (Santa Cruz, Argentina) provide valuable information about the formation of the fossil record. In this paper, we discuss how studying these die-offs allows us to monitor the formation of the so-called averaged samples. The longitudinal monitoring of carcass assemblages aggregated in different years forced us to change the scale of analysis, which gradually approached a controlled averaged sample. In this long-term study, we evaluate the main variables involved in the processes of guanaco carcass accumulation, such as the regularity and causes of massive accumulations, the locations of dead guanaco concentrations, the spatial superposition of deaths, and the variation in the size of bone patches due to processes such as carnivore action, trampling, and gravity sliding. For the analysis, we used the concepts of accumulation cycle, tempo, settling in, fossil stability, formational forcing, and retarding factors. Our results allow us to propose various conditions of bone preservation and identify spatial sectors with better burial opportunities, which are useful for constructing long-term viable analogous models, the usual ones of the archaeological and paleontological records.
subject: Thematic Volume
  topic: section
subject: Actualistic taphonomy
  topic: keywords
subject: Bone accumulations
  topic: keywords
subject: Massive deaths
  topic: keywords
subject: Generic and specific redundancy
  topic: keywords
subject: Settling in
  topic: keywords
subject: Accumulation cycles
  topic: keywords
subject: Patagonia
  topic: keywords
subject: Taphonomy
  topic: disciplines
creator: Luis Alberto Borrero
creator: María A. Gutiérrez
creator: Agustina Massigoge
creator: Juan Bautista Belardi
creator: Cristian A. Kaufmann
creator: María Clara Álvarez
rights: Copyright (c) 2025 Luis Alberto Borrero, María A. Gutiérrez, Agustina Massigoge, Juan Bautista Belardi, Cristian A. Kaufmann, María Clara Álvarez https://creativecommons.org/licenses/by-nd/4.0
date: 2025-10-20
publication date: 2025-10-20
starting page: 137
ending page: 154
doi: 10.5710/PEAPA.02.07.2025.543

Libro de Resúmenes de la Reunión de Comunicaciones de la Asociación Paleontológica Argentina 2024
type: item
description: Libro de Resúmenes de la Reunión de Comunicaciones de la Asociación Paleontológica Argentina. La misma tuvo lugar en la ciudad de San Rafael (Mendoza, Argentina) durante los días 22-24 de Noviembre del 2024.
subject: Abstract supplement
  topic: section
subject: Libro de Resúmenes
  topic: keywords
subject: Mendoza
  topic: keywords
subject: RCAPA
  topic: keywords
subject: 2024
  topic: keywords
creator: Comité Organizador de la RCAPA 2024
rights: Copyright (c) 2025 Comité Organizador de la RCAPA 2024 https://creativecommons.org/licenses/by-nd/4.0
date: 2025-07-02
publication date: 2025-07-02
starting page: 1
ending page: 218
doi: 10.5710/PEAPA/19.06.2025.544

ENVIRONMENTAL HISTORY FOR THE LAST TWO MILENNIA IN THE CENTRAL ARGENTINEAN PAMPA PLAIN: A PALEOLIMNOLOGICAL APPROACH
type: item
description: The Central Pampa plain (36º–37º S; 60º–61º W) presents numerous shallow lakes subjected to climatic dynamics and anthropogenic impacts during the Late Holocene, but few were analyzed. New studies are essential to provide an integral and regional analysis of these lakes evolution. In this context, a multi-indicator analysis including sedimentary and palynomorph (pollen and non-pollen) indicators was performed to reconstruct the paleoenvironmental evolution of Blanca Chica shallow lake during the past 1700 years. Four main lake condition stages were identified. Natural forcing dominated the period prior to 1880 CE, followed by a scenario characterized by the combined action of anthropic and natural forcings. Between 260800 CE, laminated sediments and phytoplankton dominance point to a high-level, turbid, nutrient rich lake during a wet period. Between 800–1600 CE, massive sediments, increasing halophytic vegetation and decreasing phytoplankton indicate a lower water-lake level in a dry context. This drought scenario was intensified between 1660–1830 CE as suggested by massive mottled sediments, submerged macrophytes remains and filamentous chlorophytes. A shift to wetter conditions is indicated for 1830–2015 CE, by a perennial, turbid, eutrophic, high-level lake with massive organic sediments. The onset of agriculture and cattle was shown by a raise in pollen taxa (i.e., 1830) and increased sedimentation rates related to soils erosion which suggested intense anthropic activity. The change in the aquatic communities and sedimentology for the last 30 years allowed considering a shift to high anthropogenic impact combined with an increase in precipitation which generated an accelerated eutrophication of the lake.
subject: Articles
  topic: section
subject: Shallow lake
  topic: keywords
subject: Late Holocene
  topic: keywords
subject: South America Palynology
  topic: keywords
subject: Sedimentology
  topic: keywords
subject: Natural forcing
  topic: keywords
subject: Human activities
  topic: keywords
subject: Paleolimnology
  topic: disciplines
creator: Guillermina Sánchez Vuichard
creator: Nerina Pisani
creator: Carolina Vásquez
creator: Diego Navarro
creator: Eduardo Piovano
creator: Silvina Stutz
rights: Copyright (c) 2025 Guillermina S´ánchez Vuichard, Nerina Pisani, Carolina Vásquez, Diego Navarro, Eduardo Piovano, Silvina Stutz https://creativecommons.org/licenses/by-nd/4.0
date: 2025-11-12
publication date: 2025-11-12
starting page: 191
ending page: 209
doi: 10.5710/PEAPA.01.07.2025.534

WHO EATS THE ARMADILLOS? NEOTAPHONOMY OF ACCUMULATIONS PRODUCED BY THE CROWNED EAGLE (BUTEOGALLUS CORONATUS)
type: item
description: Neotaphonomic studies of vertebrates provide information about the mechanisms and processes that can modify the original characteristics of skeletal elements and can be used as analogues for interpretations on the origin of archeological and paleontological assemblages. The neotaphonomic evaluation of non-ingested bones (leftover prey remains) and modified digested bones by the crowned eagle (Buteogallus coronatus Accipitriformes, Accipitridae) is presented. Bones were recovered from the nests located in the central–west La Pampa Province, Argentina. Leftover prey remains include representatives of Aves, Iguania, Ophidia, Cingulata, Lagomorpha, and Carnivora. Bones from pellets correspond to Ophidia, Rodentia, and osteoderms of two armadillos Chlamyphoridae (Xenarthra, Cingulata). Some of the latter correspond to pichi (Zaedyus pichiy Euphractinae), a common species that is usually located in the diet of B. coronatus. Zaedyus pichiy osteoderms, recovered from pellets, present modifications in the original ornamentation, as well as a reduction in their thickness. Various pellets also contained remains of pink fairy armadillo (Chlamyphorus truncatus, Chlamyphorinae), a small paradigmatic, nocturnal and fossorial species, endemic to centralwestern Argentina, which is recorded for the first time as part of this raptor diet. This first mention of Chl. truncatus being captured by the crowned eagle is relevant because it involves two little–known and sympatric species, in an area where this armadillo is endemic. Osteoderms of Chl. truncatus show an extreme degree of modification, and it is interpreted that its potential of preservation in the fossil record is very low.
subject: Thematic Volume
  topic: section
subject: Actualistic taphonomy
  topic: keywords
subject: Accipitridae
  topic: keywords
subject: Chlamyphoridae
  topic: keywords
subject: Digested osteoderms
  topic: keywords
subject: Central–western Argentina
  topic: keywords
subject: Taphonomy
  topic: subjects
creator: Claudia Inés Montalvo
creator: Marta Susana Kin
creator: Fernando Julián Fernández
creator: Maximiliano Adrián Galmes
creator: Daniel Barasoain
creator: Rodrigo Leandro Tomassini
rights: Copyright (c) 2025 Claudia Inés Montalvo, Marta Susana Kin, Fernando Julián Fernández, Maximiliano Adrián Galmes, Daniel Barasoain, Rodrigo Leandro Tomassini https://creativecommons.org/licenses/by-nd/4.0
date: 2025-10-20
publication date: 2025-10-20
starting page: 118
ending page: 136
doi: 10.5710/PEAPA.13.05.2025.529

4th Annual Meeting of the IGCP 735
type: item
description: Libro de Resúmenes del 4th Annual Meeting of the IGCP 735, que tuvo lugar en la provincia de Córdoba (Argentina) durante el mes de Octubre del 2024.
subject: Abstract supplement
  topic: section
subject: IGCP
  topic: keywords
subject: Córdoba
  topic: keywords
subject: 2024
  topic: keywords
subject: Libro
  topic: keywords
subject: Resúmenes
  topic: keywords
rights: Copyright (c) 2024 https://creativecommons.org/licenses/by-nd/4.0
date: 2024-12-30
publication date: 2024-12-30
doi: 10.5710/

ORNITÓPODOS BASALES DEL CENTRO-SUR DE CHUBUT, PATAGONIA CENTRAL: CONSIDERACIONES EVOLUTIVAS, PALEOHISTOLÓGICAS Y PALEOAMBIENTALES
type: item
description: In the south-central area of Chubut Province, excellent outcrops of sedimentary rocks which comprise the main fill of the Golfo San Jorge Basin are well exposed. Within this basin, due their abundance of vertebrate fossil remains, stand out the Bajo Barreal Formation (early Cenomanian–late Turonian) and the Lago Colhué Huapi Formation (Coniacian Maastrichtian). Although the record is largely dominated by saurischian dinosaurs, ornithischian fossils, particularly ornithopods, have increased in recent years. In this context, this contribution aims to increase our knowledge of the basal ornithopods Notohypsilophodon comodorensis and Sektensaurus sanjuanboscoi from the Bajo Barreal and Lago Colhué Huapi formations, respectively. Also, for the first time, aspects of the paleohistology are addressed and described for both ornithopods. Likewise, with the lines of evidence available at the moment and awaiting new studies that better resolve the systematic relationships at the base of Ornithopoda, it is suggested that the elasmarians would have originated in eastern Gondwana probably during the early Cretaceous. Subsequently, they would have dispersed to western Gondwana where they attained larger body sizes. Finally, at least in central Patagonia, environmental selection is observed between basal ornithopods (elasmarians) and derived ones (hadrosaurids). The former would have developed in inland environments with climates with certain seasonality, while the hadrosaurids would have selected environments close to the sea and with a more homogeneous climate.
subject: Articles
  topic: section
subject: Elasmaria
  topic: keywords
subject: Late Cretaceous
  topic: keywords
subject: Distribution
  topic: keywords
subject: Sedimentary environment
  topic: keywords
subject: Golfo San Jorge Basin
  topic: keywords
subject: Chubut Group
  topic: keywords
subject: Vertebrate Paleontology
  topic: disciplines
subject: Paleohistology
  topic: disciplines
subject: Biogeography
  topic: disciplines
creator: Lucio Manuel Ibiricu
creator: Ignacio Alejandro Cerda
creator: Julieta Lucia Caglianone
creator: Noelia Victoria Cardozo
creator: Bruno Nicolás Alvarez
creator: Sol Aldana Cavasin
creator: Gabriel Andrés Casal
rights: Copyright (c) 2025 Lucio Manuel Ibiricu, Ignacio Alejandro Cerda, Julieta Lucia Caglianone, Noelia Victoria Cardozo, Bruno Nicolás Alvarez, Sol Aldana Cavasin, Gabriel Andrés Casal https://creativecommons.org/licenses/by-nd/4.0
date: 2025-04-10
publication date: 2025-04-10
starting page: 31
ending page: 48
doi: 10.5710/PEAPA.15.11.2024.521

FROM BURMEISTER TO AMEGHINO AND THE WORLDWIDE RECOGNITION OF THE VERTEBRATE PALEONTOLOGY FROM ARGENTINA
type: item
description: Francisco J. Muñiz was undoubtedly the first national Argentine paleontologist, preceding Florentino Ameghino with its pioneering descriptions of the fossil bearing beds in Luján and their fossil mammals, including “Muñi-felis”. In 1861, the German naturalist Hermann Burmeister (G. Burmeister, here after) arrived in Argentina to become the Museo Público de Buenos Aires Director. G. Burmeister renovated the institution and founded the Anales del Museo, one of the oldest Argentine scientific publications. In his last years, the Museo de La Plata was consolidated under the leadership of Francisco Pascasio Moreno, who was the creator and served as its Director from 1884 to 1906. Under the direction of Moreno, the museum attracted eminent researchers, including F. Ameghino and his brother Carlos. When the Ameghino brothers left the institution, figures such as Alcides Mercerat and Santiago Roth replaced them. Roth became a key rival to Carlos in exploring Patagonian deposits with vertebrate fossils. F. Ameghino brought global visibility and reconnaissance of the Argentine paleontology due to his numerous publications based on the collections largely made by his brother Carlos and his appointment as the Director of the Museo Nacional de Buenos Aires in 1902. After the death of Florentino, Carlos remained active at this museum, where a new generation of paleontologists emerged. Among them, Lucas Kraglievich stayed briefly in the Museo de La Plata after the death of Roth. Then the Spanish mastozoologist Ángel Cabrera assumed as the Head of Paleontology, marking a notable stage in the Paleontology of Argentina.
subject: Thematic Volume
  topic: section
subject: Vertebrates
  topic: keywords
subject: Mammals
  topic: keywords
subject: Fossils
  topic: keywords
subject: Argentine Paleontology
  topic: keywords
subject: Paleovertebrates
  topic: disciplines
subject: Mastozoology
  topic: disciplines
subject: History
  topic: disciplines
creator: Mariano Bond
rights: Copyright (c) 2025 Mariano Bond https://creativecommons.org/licenses/by-nd/4.0
date: 2025-06-25
publication date: 2025-06-25
starting page: 83
ending page: 126
doi: 10.5710/PEAPA.14.02.2025.520

CETOTHERIIDAE RECORDS FROM THE LATE MIOCENE OF PATAGONIA EXPAND THE DIVERSITY OF BALEEN WHALES FROM THE SOUTHWESTERN ATLANTIC OCEAN
type: item
description: The marine outcrops of the Patagonian Miocene (Argentina) encompass one of the most important assemblages of fossil mysticetes recorded worldwide, including key records of extant lineages. The Patagonian Late Miocene records comprise balaenids (right whales) or cetotheriids neobalaenines (pygmy right whales). In the last years, the increase of fieldwork efforts in Miocene outcrops of Patagonia has led to the discovery of new specimens, thus expanding our knowledge of mysticetes diversity from regional and global perspectives. In this work, we describe isolated ear bones collected from the Late Miocene Puerto Madryn Formation 12–2.7 Ma (Serravalian to Piacenzian), Península Valdés (Chubut Province), preliminarily attributed to Cetotheriidae. Although the lack of diagnostic elements precludes a more precise identification (at genus or specific level) within this family, our studies reveal a previously unknown diversity of morphotypes, indicating significant taxonomic diversity among these Patagonian mysticetes. In addition, the South Atlantic cetotheriid assemblage appears to be represented exclusively by large taxa, probably of pelagic habits, which may have facilitated their dispersal into the southern basins. Finally, these records suggest a rapid dispersion of cetotheriids from the Paratethys into the Southern Hemisphere during the Late Miocene, with the Southwest Atlantic Ocean representing their southernmost limit of distribution.
subject: Articles
  topic: section
subject: Miocene
  topic: keywords
subject: Puerto Madryn
  topic: keywords
subject: Mysticetes
  topic: keywords
subject: Evolution
  topic: keywords
subject: Neogene
  topic: keywords
subject: Paleobiology
  topic: disciplines
subject: Paleovertebrates
  topic: disciplines
creator: Azucena Solis-Añorve
creator: Mónica R. Buono
rights: Copyright (c) 2025 Azucena Solis-Añorve, Mónica R. Buono https://creativecommons.org/licenses/by-nd/4.0
date: 2025-03-19
publication date: 2025-03-19
starting page: 1
ending page: 15
doi: 10.5710/PEAPA.22.10.2024.515

Book of Abstracts of the XXXVII Argentine Meeting of Vertebrate Paleontology
type: item
description: Book of Abstracts of the XXXVII Jornadas Argentinas de Paleontología de Vertebrados, wich took place in Ciudad de Corrientes (Corrientes, Argentina) from May 14 to 17, 2024.
subject: Abstract supplement
  topic: section
subject: Vertebrate Paleontology
  topic: keywords
subject: Argentina
  topic: keywords
subject: Mammals
  topic: keywords
subject: Paleoherpetology
  topic: keywords
subject: Fossils
  topic: keywords
creator: Organising Committee of the XXXVII JAPV
rights: Copyright (c) 2024 Comité Organizador de las XXXVII JAPV https://creativecommons.org/licenses/by-nd/4.0
date: 2024-11-06
publication date: 2024-11-06
starting page: R1
ending page: R51
doi: 10.5710/PEAPA.16.10.2024.517

MORPHOLOGY AND PALEOECOLOGY OF THE LATE PLEISTOCENE EXTINCT DUNG BEETLE ONTHOPHAGUS PILAUCO (COLEOPTERA, SCARABAEIDAE, ONTHOPHAGINI)
type: item
description: The extinct dung beetle Onthophagus pilauco Tello, Verdú, Rossini & Zunino represents the southernmost paleorecord of the onthophagine dung beetle fauna in the New World. Here, we report new fore-, mid-, and posterior leg fossil remains of this extinct beetle and present a morphological comparison of the leg phenotypes observed in the fossil record. Moreover, we illustrate and describe the fossil legs and provide paleoecological inferences based on morphological analysis. We hypothesized that the differences in size and morphology of the remains are related to sexual dimorphism. To test this hypothesis, we applied parametric and non-parametric statistical approaches to the measurement of leg traits. Based on the leg traits identified in O. pilauco, we also discuss the phylogenetic affinities with modern species. Significant differences in foretibial morphology (i.e., length, width, tooth shape, curvedness) support the sexual dimorphism hypothesis. We found that O. pilauco’s forelegs shared a lack of secondary denticles with the O. hippopotamus species complex, although our diagnostic suggests that this trait evolved independently in these species groups. Finally, we discuss the paleoecology of the species based on the morphology of males and females and propose that this extinct species had paracoprid and hypophagic nesting behavior.
subject: Articles
  topic: section
subject: Fossil records
  topic: keywords
subject: Morphology
  topic: keywords
subject: Extinct species
  topic: keywords
subject: Quaternary
  topic: keywords
subject: Insects
  topic: keywords
subject: Dung beetles
  topic: keywords
subject: Paleoentomology
  topic: disciplines
creator: Francisco Tello
creator: Luis Libido
creator: Victor Moctezuma
rights: Copyright (c) 2024 Francisco Tello, Luis Libido, Victor Moctezuma https://creativecommons.org/licenses/by-nd/4.0
date: 2024-12-04
publication date: 2024-12-04
starting page: 160
ending page: 169
doi: 10.5710/PEAPA.09.09.2024.510

CONTRIBUTION TO THE KNOWLEDGE OF THE FOSSIL FUNGI RECORD BASED ON PALYNOMYCOLOGICAL STUDIES FROM THE EL FOYEL GROUP, ÑIRIHUAU BASIN, PALEOGENE FROM PATAGONIA ARGENTINA
type: item
description: Spores, conidiophores, and hyphae of fossil fungi recovered from nine outcropping siltstone and shale samples belonging to the Troncoso, Salto del Macho, and Río Foyel formations in the El Foyel Group at the Río Foyel Section, are described and illustrated. Representatives of 16 genera were recognized. Among the 26 species described, one is proposed as a new species, Inapertisporites lacrimaformis. Amerospores are the most abundant type of spores recovered. Based on the palynostratigraphical analysis of the non-pollinic (fungal) remains, a Paleogene age for the El Foyel Group is suggested. Of the three formations, Troncoso shows the highest abundance and diversity of fungal remains, which is believed to be representative of a period of optimal climatic conditions characterized as warm temperate and humid, probably related to the Middle Eocene Climate Optimum (MECO). Based on the paleoeological preferences of the specimens recovered from the El Foyel Group, a riparian or lacustrine environment in a woodland setting is inferred.
subject: Articles
  topic: section
subject: Fossil fungal spores
  topic: keywords
subject: Inapertisporites
  topic: keywords
subject: El Foyel Group
  topic: keywords
subject: Troncoso Formation
  topic: keywords
subject: Paleogene
  topic: keywords
subject: MECO
  topic: keywords
subject: Argentina
  topic: keywords
subject: Paleomycology
  topic: disciplines
creator: Marcelo Adrián Martínez
creator: María Virginia Bianchinotti
creator: María Elina Cornou
rights: Copyright (c) 2024 Marcelo Adrián Martínez, María Virginia Bianchinotti, María Elina Cornou https://creativecommons.org/licenses/by-nd/4.0
date: 2024-10-30
publication date: 2024-10-30
starting page: 132
ending page: 159
doi: 10.5710/PEAPA.12.07.2024.508

THE FIRST EOCENE BIRD FROM NORTHWESTERN ARGENTINA
type: item
description: A new fossil bird is described from the Upper Lumbrera Formation of Northwestern Argentina. Lumbrerornis rougieri gen. et sp. nov. is represented by three-dimensionally preserved elements of the hindlimb of a single individual. Morphological comparative studies and particular characters of the tibiotarsus suggest that the new species might be related to the extinct clades Palaeotididae and Geranoididae of the Northern Hemisphere, which were recently hypothesized to be Paleogene palaeognathous birds. However, the fragmentary preservation of the new fossil prevents a confident systematic position. The Upper Lumbrera Formation is a widely recognized fossiliferous unit with a very rich fauna of mammals and other vertebrates (e.g., fishes, crocodilians, turtles, snakes). This is the first record of a three-dimensionally preserved fossil bird from the Eocene of northwestern Argentina and thus provides fresh evidence of the Eocene faunas from the area and improves our understanding of the poorly known early Paleogene avifaunas from South America.
subject: Articles
  topic: section
subject: Aves
  topic: keywords
subject: Eocene
  topic: keywords
subject: Paleogene
  topic: keywords
subject: Upper Lumbrera Formation
  topic: keywords
subject: Vertebrate Paleontology
  topic: subjects
subject: Systematics
  topic: subjects
creator: Sara Bertelli
creator: Norberto Pedro Giannini
creator: Daniel Alfredo García-López
creator: Virginia Deraco
creator: Judith Babot
creator: Cecilia Del Papa
creator: Matias Alberto Armella
creator: Claudia Herrera
creator: Gerald Mayr
rights: Copyright (c) 2024 Sara Bertelli, Norberto Pedro Giannini, Daniel Alfredo García-López, Virginia Deraco, Judith Babot, Cecilia Del Papa, Matias Alberto Armella, Claudia Herrera, Gerald Mayr https://creativecommons.org/licenses/by-nd/4.0
date: 2024-09-11
publication date: 2024-09-11
starting page: 78
ending page: 89
doi: 10.5710/PEAPA.31.05.2024.511

A MESOZOIC DINO-FEAST: MULTIPLE TEETH MARKS ON A SAUROPOD DINOSAUR BONE FROM THE UPPER CRETACEOUS OF PATAGONIA AND EVIDENCE ON THEROPOD FEEDING BEHAVIOR
type: item
description: Marks left by teeth on bones are evidence for inferring trophic interactions. In carnivorous dinosaurs, such evidence is rare in the fossil record. We present here the description of a fragment of sauropod appendicular bone, which exhibits teeth marks consistent with multiple trace makers. The specimen MPM-PV-19111 comes from Cretaceous rocks outcropping at Cerro Fortaleza locality (Cerro Fortaleza Formation, Campanian–Maastrichtian), Santa Cruz Province, Argentina. It preserves three faces, two bearing grooves, and a third bearing shallow pits. There are about 100 scars (we identified at least 99 grooves and 19 pits), with the grooves mainly oriented more or less perpendicular to the main axis of the bone. These grooves have a width ranging from 1 to 3.5 mm, and generally narrow distally. The pits and punctures are circular to subcircular and variable in diameter (1.5–4 mm). The feeding traces are attributable to theropod dinosaurs -abelisaurids and megaraptorids were recorded in the same formation- of mid to large body size, notosuchid crocodyliforms, and a possible indeterminate small mammal. The teeth marks are considered post-mortem based on the lack of healing on the surrounding bone. The high number of teeth marks suggests both repeated high-power bites in a restricted area (gnawing-like behavior?) and multiple producers, probably biting the bone at different moments since smaller-sized animals would intend to avoid the larger ones. This study aims to describe and interpret the possible origin of the bite marks preserved on this Cretaceous sauropod bone.
subject: Articles
  topic: section
subject: Teeth marks
  topic: keywords
subject: Feeding marks
  topic: keywords
subject: Trophic interaction
  topic: keywords
subject: Gnaw
  topic: keywords
subject: Cretaceous mammal
  topic: keywords
creator: Ariana Paulina-Carabajal
creator: Ariel Hernán Méndez
creator: Karen Ulloa-Guaiquín
creator: Facundo Irazoqui
creator: Yuong-Nam Lee
rights: Copyright (c) 2025 Ariana Paulina-Carabajal, Ariel Hernán Méndez, Karen Ulloa-Guaiquín, Facundo Irazoqui, Yuong-Nam Lee https://creativecommons.org/licenses/by-nd/4.0
date: 2025-04-02
publication date: 2025-04-02
starting page: 16
ending page: 30
doi: 10.5710/PEAPA.22.09.2024.512

THE RÍO LORO FORMATION (PALEOGENE, NORTHWESTERN ARGENTINA) AND ITS UNIQUE VERTEBRATE FAUNA: EXPLORING PALEOENVIRONMENTAL AND PALEOECOLOGICAL ASPECTS
type: item
description: Paleoenvironmental and paleoecological aspects of the Río Loro Formation (Paleogene, northwestern Argentina) were analyzed. In the type locality, four main sedimentary facies were recognized. Facies 1 (coarse-grained to pebbly amalgamated sandstones) record sedimentation in braided channels. Facies 2 (structureless to faintly laminated mudstones) and Facies 3 (interbedded mudstones with sandstones) are ascribed to deposition in distal to proximal floodplain settings, respectively. Facies 4 (coarse to medium-grained sandstone) is interpreted as deposited in meandering channels. Insect trace fossils, ascribed to nesting structures, were recognised particularly in facies 1 and 4. The recognized facies were grouped in a main facies association which allows interpretating a deposition in a complex multi-channel fluvial system with relatively stable muddy floodplain areas. Within this system, seasonal humid to dryer conditions favored biota substrate colonization and soil-forming processes. Well-preserved mammalian and reptilian remains were recognized in sandy mudstone deposits of Facies 3, showing low weathering stages (mainly stages 1 and 2) and the absence of signs of abrasion. These aspects, along with the presence of some articulated remains and their integration with the paleoenvironmental framework, suggest that skeletal pieces suffered an early burial after partial disarticulation, possibly by splays during major floods. The inferred habits of some of the taxa recorded are consistent with proximity to freshwater sources, vegetated areas, and seasonality. This multidisciplinary approach contributes to the understanding of paleoenvironmental and paleontological attributes of the Río Loro Formation and represents a basis for future surveys on this unit and its remarkable fossil record.
subject: Articles
  topic: section
subject: Sedimentology
  topic: keywords
subject: Fluvial system
  topic: keywords
subject: Fossil herpetofauna
  topic: keywords
subject: Paleoecology
  topic: keywords
subject: Pan-Perissodactyla
  topic: keywords
subject: Vertebrate Paleontology
  topic: disciplines
subject: Paleoherpetology
  topic: disciplines
creator: Pablo Joaquín Alonso-Muruaga
creator: Luis Sebastián Saade
creator: Gonzalo Gabriel Bravo
creator: Guido Ezequiel Alonso
creator: María Judith Babot
creator: Daniel Alfredo García-López
rights: Copyright (c) 2024 Pablo Joaquín Alonso-Muruaga, Luis Sebastián Saade, Gonzalo Gabriel Bravo, Guido Ezequiel Alonso, María Judith Babot, Daniel Alfredo García-López https://creativecommons.org/licenses/by-nd/4.0
date: 2024-10-17
publication date: 2024-10-17
starting page: 90
ending page: 115
doi: 10.5710/PEAPA.02.07.2024.509

ON THE HOLOTYPE OF CAENOPHILUS TRIPARTITUS AMEGHINO, 1903 (INTERATHERIIDAE, NOTOUNGULATA): REVISION AND CLARIFICATION REGARDING ITS GEOGRAPHIC AND STRATIGRAPHIC PROVENANCES
type: item
description: In 1903, Florentino Ameghino erected the genus and species Caenophilus tripartitus based on a mandibular fragment and a lower isolated molar. The former specimen was illustrated about a decade later and it has been considered missing since, at least, 1986. The first review of the species was carried out in 2019, in which the authors presented new materials from Cerro Zeballos (Chubut Province) assigned to this taxon, a new specific description, and a discussion regarding the provenance of the type specimen, due to the contradictions perceived by them in the Ameghino’s papers. Recently, the holotype of Caenophilus tripartitus was located within the Colección Nacional Ameghino at the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”. In this contribution, we present the first study of this holotype in more than a century, concluding that it did not come from the area of Río Fénix and Laguna Blanca, Mayo Formation, but from an uncertain stratigraphic level at the area of Colhué-Huapí, Chubut Province (Argentina). In addition, the comparison with the material from Cerro Zeballos evidences that it is not referable to C. tripartitus and would represent a second species of the genus, Caenophilus zeballensis sp. nov. In this way, the biochron of C. tripartitus is unknown, whereas that of the genus goes back at least to the late Middle Miocene (Serravallian).
subject: Articles
  topic: section
subject: Typotheria
  topic: keywords
subject: Interatheriinae
  topic: keywords
subject: Redescription
  topic: keywords
subject: Colhué-Huapí
  topic: keywords
subject: Miocene
  topic: keywords
subject: Florentino Ameghino
  topic: keywords
subject: Vertebrate Paleontology
  topic: disciplines
creator: Mercedes Fernández
creator: Mariano Bond
creator: Juan Carlos Fernicola
rights: Copyright (c) 2024 Mercedes Fernández, Mariano Bond, Juan Carlos Fernicola https://creativecommons.org/licenses/by-nd/4.0
date: 2024-10-23
publication date: 2024-10-23
starting page: 116
ending page: 131
doi: 10.5710/PEAPA.28.06.2024.507

The Family Olenidae (Trilobita, Arthropoda): A synopsis of its taxonomic composition, stratigraphic and paleogeographic distribution
type: item
description: This paper provides a list of all named species in the family Olenidae, along with their geographic and stratigraphic records. It also discusses each of the valid genera in the family and describes the composition of the entire group and its subfamilies in terms of species and generic richness across different periods and geographical areas. The family encompasses 64 genera and 394 species, primarily concentrated in the subfamilies Oleninae and Pelturinae (65.63% of the genera and 58.12% of the species). The Olenidae was first documented during the Guzhangian in Baltica, and subsequently, its range expanded globally to Eastern Gondwana (Australia), South China, and Siberia. The Furongian saw a peak in species diversity (61.88% of the total) and widespread distribution. During the Tremadocian, the number of species declined, yet the geographic range persisted, and this decrease continued for the rest of the Ordovician. Although the family is cosmopolitan, Baltica and Avalonia host almost half of the records (46.71%). Challenges in olenid systematics include species lacking proper illustrations and/or lost type materials, poorly diagnosed genera, and potential polyphyletic larger families. The study emphasizes the importance of precise species and genus delimitation. The dataset presented serves as an initial step in achieving a clearer phylogenetic classification of the family Olenidae.
subject: Articles
  topic: section
subject: Olenidae
  topic: keywords
subject: Descriptive statistics
  topic: keywords
subject: Stratigraphic distribution
  topic: keywords
subject: Paleogeographic distribution
  topic: keywords
subject: Cambrian
  topic: keywords
subject: Ordovician
  topic: keywords
creator: Daniela Soledad Monti
rights: Copyright (c) 2025 Daniela Soledad Monti https://creativecommons.org/licenses/by-nd/4.0
date: 2025-07-30
publication date: 2025-07-30
starting page: 1
ending page: 38
doi: 10.5710/PEAPA/21.10.2024.505

THE ORDOVICIAN CONODONT TRIPODUS LAEVIS BRADSHAW, 1969: ITS TAXONOMIC VALIDITY AND BIOSTRATIGRAPHIC VALUE IN THE ARGENTINE PRECORDILLERA
type: item
description: The conodont species Tripodus laevis has been used as an index conodont to mark the lower boundary of the Middle Ordovician in the Midcontinent and Precordillera conodont biostratigraphic charts, despite that T. laevis or specimens assignable to this species span from lower Floian to middle Darriwilian. Also, this conodont species has a complex taxonomic history. It has been located in different conodont families and its apparatus has been composed of varying conodont morphotypes. In the present contribution, we conducted a critical revision of the taxonomic history of T. laevis, as well as its biostratigraphic value as a key species for indicating the lower boundary of the Dapingian stage. Based on this analysis, we propose that T. laevis sensu lato (s. l.) should not be considered a valid species and to avoid using this species for the Argentine Precordillera. Therefore, we suggest discontinuing the first appearance datum of T. laevis s. l. as a marker for the lower boundary of the Middle Ordovician in this region. In light of this proposal, we suggest using a new Dapingian conodont biostratigraphic chart for the Argentine Precordillera.
subject: Articles
  topic: section
subject: Dapingian
  topic: keywords
subject: Conodont
  topic: keywords
subject: Argentina
  topic: keywords
subject: Precordillera
  topic: keywords
subject: Taxonomy
  topic: disciplines
subject: Palaeoinvertebrates
  topic: disciplines
subject: Micropaleontology
  topic: disciplines
subject: Biostratigraphy
  topic: disciplines
creator: Ana Mestre
creator: Florencia Moreno
creator: Susana Heredia
rights: Copyright (c) 2024 Ana Mestre, Florencia Moreno, Susana Heredia https://creativecommons.org/licenses/by-nd/4.0
date: 2024-09-04
publication date: 2024-09-04
starting page: 68
ending page: 77
doi: 10.5710/PEAPA.09.04.2024.489

GRAPTOLITES FROM THE NORTHWESTERN ARGENTINA OF THE “LOSS COLLECTION”: TAXONOMY, AGE, AND CORRELATION
type: item
description: Renato Loss was an Italian geologist who worked at the Instituto de Geología y Minería de Jujuy since 1948 to 1952, finding out important localities with early Paleozoic graptolites from the Northwestern Argentina and providing pioneer records that increased the knowledge of this group. The “Loss Collection” has been housed in the Museo de Ciencias Naturales “Dr. Saturnino Iglesias” at the Instituto de Geología y Minería of the Universidad Nacional de Jujuy for over six decades. This paper comprises the outcomes of systematic taxonomic revisions of the graptolite specimens from the “Loss Collection”. This study allowed to confirm the presence of 14 taxa coming from nine distinct Ordovician and Silurian sites in the Salta and Jujuy provinces, some of which are mentioned for the first time in the region. Additionally, we provide descriptions of five species coming from the Cuesta de Toquero stratigraphic section, closely located to the northern area explored by Dr. Loss. These specimens are preserved in the paleontological repository of the Centro de Investigaciones en Ciencias de la Tierra, Córdoba, Argentina. The taxonomic conclusions enrich the scientific value of the studied graptolite collection; provide new biostratigraphic insights, based on the recognized key taxa; and more accurate correlations of the yielding deposits.
subject: Articles
  topic: section
subject: Graptolithina
  topic: keywords
subject: Salta
  topic: keywords
subject: Jujuy
  topic: keywords
subject: Argentina
  topic: keywords
subject: Ordovician
  topic: keywords
subject: Silurian
  topic: keywords
subject: Palaeoinvertebrates
  topic: disciplines
subject: Systematics
  topic: disciplines
creator: Blanca Azucena Toro
creator: Nexxys Carolina Herrera Sánchez
creator: Gerardo Andrés Lo Valvo
rights: Copyright (c) 2024 Blanca Azucena Toro, Nexxys Carolina Herrera Sánchez, Gerardo Andrés Lo Valvo https://creativecommons.org/licenses/by-nd/4.0
date: 2024-07-03
publication date: 2024-07-03
starting page: 1
ending page: 22
doi: 10.5710/PEAPA.23.03.2024.503

CONTRIBUTION OF PHYTOLITH RECORDS TO THE PALEOENVIRONMENTAL RECONSTRUCTION OF THE LATE HOLOCENE IN THE SANTA MARÍA VALLEY (TUCUMÁN - ARGENTINA)
type: item
description: The present research aims to use phytoliths as proxies to carry out the paleoenvironmental reconstruction of the middle section of the Santa María Valley (Tucumán - Argentina) during the Late Holocene. This is to be considered within the broader regional and global paleoenvironmental context. For this purpose, sediment samples were taken from profiles located in different locations: Molle Yaco, Yasyamayo, and El Pichao. The phytolithic assemblages found reveal the existence of sections and subsections in which each of the profiles is divided. These reflect the presence of humid and cool conditions from pre-Christian era moments until approximately cal. 1,000 AP, when conditions become arid and warm, contemporaneously with the Medieval Warm Anomaly, and then resume temperate and cold episodes correlatable to the Little Ice Age. Current environmental conditions are represented by phytolithic assemblages describing arid and semi-arid vegetation.
subject: Articles
  topic: section
subject: NOA
  topic: keywords
subject: Calchaquíes valleys
  topic: keywords
subject: Paleoenvironment
  topic: keywords
subject: Vegetation
  topic: keywords
subject: Arid and semi-arid environments
  topic: keywords
subject: Paleobotany
  topic: disciplines
subject: Micropaleontology
  topic: disciplines
creator: Maria Gisela Lefebvre
creator: Diego Alejandro Sampietro
creator: Alejandro Fabian Zucol
creator: María de los Milagros Colobig
creator: María Marta Sampietro Vattuone
rights: Copyright (c) 2024 Maria Gisela Lefebvre, Diego Alejandro Sampietro, Alejandro Fabian Zucol, María de los Milagros Colobig, María Marta Sampietro Vattuone https://creativecommons.org/licenses/by-nd/4.0
date: 2024-05-01
publication date: 2024-05-01
starting page: 164
ending page: 182
doi: 10.5710/PEAPA.27.03.2024.494

Abstracts Book of the Reunión de Comunicaciones de la Asociación Paleontológica Argentina 2023
type: item
description: Abstract Book of the Reunión de Comunicaciones de la Asociación Paleontológica Argentina. It was held at Universidad Nacional de Río Negro in General Roca city (Río Negro, Argentina) during November 22-24, 2023.
subject: Abstract supplement
  topic: section
subject: General Roca
  topic: keywords
subject: Abstract Book
  topic: keywords
subject: RCAPA
  topic: keywords
subject: 2023
  topic: keywords
creator: Organizing Committee of the RCAPA 2023
rights: Copyright (c) 2024 Comité Organizador de la RCAPA 2023 https://creativecommons.org/licenses/by-nd/4.0
date: 2024-06-26
publication date: 2024-06-26
starting page: R1
ending page: R165
doi: 10.5710/PEAPA.04.04.2024.502

WIDER PALEOGEOGRAPHICAL DISTRIBUTION OF BOTHREMYDID TURTLES IN NORTHERN SOUTH AMERICA DURING THE PALEOCENE–EOCENE
type: item
description: Bothremydidae was one of the most diverse and widespread group of side-necked turtles (pleurodirans) during the Cretaceous and part of the Paleogene. In South America, the Paleogene record of bothremydids is restricted to Puentemys mushaisaensis from the middle–late Paleocene Cerrejón Formation of Colombia, Inaechelys pernambucensis from the Paleocene of Brazil, and Motelomama olssoni from the early Eocene of Perú. Here, we describe two shells of P. mushaisaensis and several other isolated bones conferred to this taxon from the upper Paleocene and lower Eocene Arcillolitas de Socha Formation found in the Socha Region, Boyacá Department of Colombia. U-Pb dating of detrital zircon from two levels from this formation indicates maximum depositional ages of 56.83±0.04 Ma and 57.2±0.5 Ma for the areniscas guía interval of the formation. The new occurrence of P. mushaisaensis in the Socha region, at least 500 km south from Cerrejón, indicates a wider biogeographical distribution of northern South America Paleocene herpetofauna, possibly helped by low topography and ecosystems connectivity via a faunistic corridor.
subject: Articles
  topic: section
subject: Testudines
  topic: keywords
subject: Colombia
  topic: keywords
subject: Paleobiogeography
  topic: keywords
subject: Bothremydidae
  topic: keywords
subject: Arcillolitas de Socha Formation
  topic: keywords
subject: Paleovertebrates
  topic: disciplines
subject: Paleobiogeography
  topic: disciplines
creator: Edwin-Alberto Cadena
creator: Byron Benítez
creator: Francisco Emmanuel Apen
creator: James Leahey Crowley
creator: John Cottle
creator: Carlos Jaramillo
rights: Copyright (c) 2024 Edwin-Alberto Cadena, Byron Benítez, Francisco Emmanuel Apen, James Leahey Crowley, John Cottle, Carlos Jaramillo https://creativecommons.org/licenses/by-nd/4.0
date: 2024-04-24
publication date: 2024-04-24
starting page: 149
ending page: 163
doi: 10.5710/PEAPA.14.02.2024.499

https://peapaleontologica.org.ar/index.php/peapa/article/view/493
type: item
title: CURATION AND CATALOGING OF THE “OLD COLLECTIONS” OF FOSSIL VERTEBRATES OF THE MUSEO DE LA PLATA (1884–1902): THE CASE OF NESODONTINAE (MAMMALIA, NOTOUNGULATA,TOXODONTIDAE) FROM THE SANTA CRUZ FORMATION
description: The process of organizing early collections for the simple sake of storing and retrieving information—for example, assigning identifying numbers to specimens, recording those numbers in a catalog, and, more recently, adding that information to a computerized database—has long been central to museum collections management. In this sense, catalog numbers are vital when specimens are used for research. Particularly the early fossil vertebrate collections (“Old Collections”) of the Museo de La Plata, Argentina, incorporated in the last decades of the 19th Century and the beginning of the 20th century (that is, between 1884 and 1902) to this institution are considered foundational. They hold approximately 35,000 specimens that show diverse and varied ways in the curatorial and cataloging procedures carried out throughout time. In this contribution, we selected the notoungulate mammals Nesodontinae (Toxodontidae) from the Santa Cruz Formation (Early–Middle Miocene) housed in the Vertebrate Paleontology collection, as a sample study. The reasons to study this group are: (1) its scientific importance, as it was one of the best studied between 1887 and 1894; (2) it includes some of the first vertebrates incorporated into the Museo de La Plata in 1884; and (3) there are a large number of specimens in the collection. More than 780 specimens were reviewed, with 84 type specimens registered, several previously reported as lost.
subject: Thematic Volume
  topic: section
subject: Toxodontia
  topic: keywords
subject: Nesodon
  topic: keywords
subject: Adinotherium
  topic: keywords
subject: Santacrucian
  topic: keywords
subject: Old collections
  topic: keywords
subject: Management
  topic: keywords
creator: Marcelo Reguero
creator: María Susana Bargo
creator: Sergio F. Vizcaíno
rights: Copyright (c) 2025 Marcelo Reguero, María Susana Bargo, Sergio F. Vizcaíno https://creativecommons.org/licenses/by-nd/4.0
date: 2025-06-25
publication date: 2025-06-25
starting page: 177
ending page: 197
doi: 10.5710/PEAPA.11.09.2024.493

THE FORMATION PROCESS OF THE AMEGHINO’S ARCHAEOLOGICAL COLLECTION PRESENTED IN PARIS IN1878: COMPOSITION, CATALOGING, AND DESTINATION
type: item
description: In this study, we analyze the formation process of the collection that Florentino Ameghino presented to the occidental world at the Universal Exposition, which took place in Paris in 1878 and from which he materially supported his theory regarding the antiquity of “men” in the Río de La Plata Basin. We develop an analysis based on the same structure of the “Catalogue spécial de la section Anhtropologique et Paléontologique de la République Argentine a L’expositionuniverselle de Paris (1878)” and we contrast it with the information provided in his previous works. In this Special Catalog, Ameghino provided information on human, faunal, and cultural remains, which contributed to the construction of his collection up until before the exhibition. The structuring of the Special Catalog connects us with the evolution of Ameghino’s scientific thought through his classification regarding the natural or anthropic origin of the objects, the temporal order that he assigned to the findings, and the sedimentary deposits carrying the objects. We analyze the classificatory categories, their implications, and the curatorial destinations of the collection that Ameghino presented in Paris. The analysis of this collection, which nowadays constitutes one of the most important regarding the knowledge of the antiquity of the human population in South America and its relationship with the fossil mammals of the Pleistocene–Holocene, is limited by the dissociation of the cultural and biological evidence that was found in the same context and that is currently housed in different national and foreign institutions.
subject: Thematic Volume
  topic: section
subject: Natural object
  topic: keywords
subject: Cultural object
  topic: keywords
subject: Quaternary
  topic: keywords
subject: Miocene
  topic: keywords
subject: Buenos Aires
  topic: keywords
subject: Curatorship
  topic: disciplines
subject: Archaelogy
  topic: disciplines
subject: History
  topic: disciplines
creator: Carola Castiñeira Latorre
creator: Juan Carlos Fernicola
rights: Copyright (c) 2025 Carola Castiñeira Latorre, Juan Carlos Fernicola https://creativecommons.org/licenses/by-nd/4.0
date: 2025-06-25
publication date: 2025-06-25
starting page: 143
ending page: 155
doi: 10.5710/PEAPA.30.04.2024.473