Raúl Vezzosi | CONICET - Academia.edu (original) (raw)
Papers by Raúl Vezzosi
Swiss Journal of Palaeontology
Nearctic ungulates such as artiodactyls, perissodactyls, and proboscideans arrived in South Ameri... more Nearctic ungulates such as artiodactyls, perissodactyls, and proboscideans arrived in South America during the Great American Biotic Interchange. Among them are camelids, cervids, tayassuids, equids, tapirids and gomphotherids. A historical collection of Nearctic ungulates from Pleistocene deposits of the Pampean region in Argentina is here studied and described. The collection consists of specimens collected by Santiago Roth in the nineteenth century and brought to Europe, where they are housed in the paleontological collections of the University of Zurich and the Natural History Museum of Geneva. Among the taxa reported here are Notiomastodon platensis,Lama guanicoe, Hemiauchenia paradoxa, Tayassu pecari, Morenelaphus sp., Hippidion cf. H. principale, Equus cf. E. neogeus, and other indeterminate gomphotherids, camelids, tayassuids, cervids, and equids. The exact stratigraphic position of these fossils collected more than 130 years ago is in many cases uncertain. The historical co...
Revista Mexicana De Ciencias Geologicas, Aug 1, 2011
Journal of Mammalian Evolution
Sloths represent one of the most successful South American clades that reached North America duri... more Sloths represent one of the most successful South American clades that reached North America during the Great American Biotic Interchange (GABI). At least four families are known from the Pleistocene of North America: Mylodontidae, Megalonychidae, Megatheriidae, and Nothrotheriidae. Members of the Nothrotheriidae are known from the Middle Miocene to the Pleistocene/Holocene transition in the Americas, but Nothrotheriops is the only genus in the family recorded in North America. Recently, femora with characteristic nothrothere morphology were recovered from Santa Fe, Argentina, and assigned to Nothrotheriops, thus greatly expanding the geographic distribution of this taxon. In Uruguay, records of Quaternary Nothrotheriidae are scarce, and previous reports are limited to the genus Nothrotherium. In this work, we describe a humerus from Arroyo del Vizcaíno (AdV), a ~30 ka site located in southern Uruguay, and assign it to the nothrotheriid Nothrotheriops sp. We also discuss several specimens from Uruguay originally assigned to Nothrotherium, which upon reexamination can be tentatively reassigned to Nothrotheriops sp. Furthermore, we employ stable isotope analysis to explore the climatic and dietary preferences of this taxon in South America. The new records are consistent with the materials reported from Argentina, thus providing new knowledge of the geographic distribution of the taxon, as well as its climatic and dietary preferences. Stable isotope results showed δ 13 C values consistent with diets based mainly on C 3 plants, similar to those published for N. shastensis in North America.
Journal of Mammalian Evolution, 2023
Sloths represent one of the most successful South American clades that reached North America duri... more Sloths represent one of the most successful South American clades that reached North America during the Great American Biotic Interchange (GABI). At least four families are known from the Pleistocene of North America: Mylodontidae, Megalonychidae, Megatheriidae, and Nothrotheriidae. Members of the Nothrotheriidae are known from the Middle Miocene to the Pleistocene/Holocene transition in the Americas, but Nothrotheriops is the only genus in the family recorded in North America. Recently, femora with characteristic nothrothere morphology were recovered from Santa Fe, Argentina, and assigned to Nothrotheriops, thus greatly expanding the geographic distribution of this taxon. In Uruguay, records of Quaternary Nothrotheriidae are scarce, and previous reports are limited to the genus Nothrotherium. In this work, we describe a humerus from Arroyo del Vizcaíno (AdV), a ~30 ka site located in southern Uruguay, and assign it to the nothrotheriid Nothrotheriops sp. We also discuss several specimens from Uruguay originally assigned to Nothrotherium, which upon reexamination can be tentatively reassigned to Nothrotheriops sp. Furthermore, we employ stable isotope analysis to explore the climatic and dietary preferences of this taxon in South America. The new records are consistent with the materials reported from Argentina, thus providing new knowledge of the geographic distribution of the taxon, as well as its climatic and dietary preferences. Stable isotope results showed δ 13 C values consistent with diets based mainly on C 3 plants, similar to those published for N. shastensis in North America.
La masa corporal de ejemplares de aves fósiles puede ser estimada mediante comparaciones con las ... more La masa corporal de ejemplares de aves fósiles puede ser estimada mediante comparaciones con las formas actuales, teniendo en cuenta que las medidas del fémur, el tibiotarso y el tarsometatarso son indicadoras del peso del animal. Estos huesos representarían una relación directa con la masa corporal, ya que proveen en distinto grado el sostén del cuerpo. En esta contribución, se calcula la masa corporal de ejemplares asignados a Procariama simplex Rovereto provenientes del Mioceno superior de Argentina, utilizando dos estimativos diferentes. El primero asume que existe similitud geométrica entre un ave fósil, cuya masa se pretende estimar, y una forma viviente análoga como Cariama cristata Linnaeus. El segundo modelo, más adecuado para su aplicación en aves, considera la influencia del tamaño o de la masa corporal sobre la forma y la función del esqueleto. Se basa en considerar la relación logarítmica entre la masa corporal y la circunferencia mínima de la diáfisis de los elementos ...
Revista Brasileira de Paleontologia, 2022
A new material of a Quaternary waterfowl is described here. The implications of this finding, in ... more A new material of a Quaternary waterfowl is described here. The implications of this finding, in the context of the dispersal of Anatidae in the past, are discussed. The specimen consists in a partial humerus coming from the Upper Pleistocene of austral Chaco from Santiago del Estero Province, Argentina. The specimen here described belongs to the tribe Cygnini, being larger than most members of the clade. The humerus shows different size than with other members of the tribe Cygnini, being larger than the humeri referred to the Andean goose (Oressochen melanopterus), the Sheldgeese of the genus Chloephaga, the Comb Duck (Sarkidiornis sylvicola), and larger than the Ruddy Shelduck (Tadorna ferruginea). However, the humerus have several anatomical characters indicating that it belongs to a basal anserine duck. These combinations of features allow us to assign this fossil to a species of waterfowl: Coscoroba coscoroba. This finding, it context with the history of the South American Cygn...
Alcheringa: An Australasian Journal of Palaeontology, 2017
Revista Mexicana de Ciencias …, 2011
Alcheringa: An Australasian Journal of Palaeontology, 2012
Vezzosi, R.I., iFirst article. First record of Procariama simplex Rovereto, 1914 (Phorusrhacidae,... more Vezzosi, R.I., iFirst article. First record of Procariama simplex Rovereto, 1914 (Phorusrhacidae, Psilopterinae) in the Cerro Azul Formation (upper Miocene) of La Pampa Province; remarks on its anatomy, palaeogeography and chronological range. Alcheringa, 1–13. ISSN 0311-5518.New records of Procariama simplex in central and northwestern Argentina are reported. The fossil material includes mandibular bones, cervical vertebrae and several elements of the fore and hindlimbs. After an exhaustive comparison of anatomical characters and morphometric analysis, the fossil specimens are assigned to the psilopterine Procariama simplex. The specimen from La Pampa Province represents the first record of a psilopterine in this central region of Argentina and derives from upper Miocene sediments of the Cerro Azul Formation. Lithological features and biostratigraphical data allow the host bed to be assigned to the Huayquerian faunal stage (late Miocene). The La Pampa record broadens the geographical distribution of Procariama simplex, which was previously restricted to northwestern Argentina.
Journal of Mammalian Evolution
Mastozoología neotropical, 2015
The Neotropical otter (Lontra longicaudis, Mustelidae, Carnivora) is defined as a generalist carn... more The Neotropical otter (Lontra longicaudis, Mustelidae, Carnivora) is defined as a generalist carnivore. Although it is a fish-crustacean feeder, rodents are ...
Journal of South American Earth Sciences, 2021
Abstract The fossil record of South American cathartids, with few exceptions, is largely restrict... more Abstract The fossil record of South American cathartids, with few exceptions, is largely restricted to Late Pleistocene and Holocene sites. This contribution provides for the first time fossil records of cathartids from Uruguay. The specimens reported here include an; almost complete fibula, an incomplete furcula, and the distal end of a tibiotarsus. The; first two specimens came from Late Pleistocene beds at two localities of from Northern Uruguay, and the last one comes from Late Pleistocene-Early Holocene beds from South-western Uruguay. All the specimens were associated with several megafaunal fossil remains. The systematic assignation and paleobiological implications of these scavenger birds are here discussed.
Journal of South American Earth Sciences, 2020
Abstract The fossil record of the genus Didelphis, despite its current diversity (6 species, 5 oc... more Abstract The fossil record of the genus Didelphis, despite its current diversity (6 species, 5 occurring in South America) and wide distribution (from southern Canada to Patagonia, Argentina), is very scarce. The oldest record of the genus in South America comes from Late Miocene sediments and the youngest records from the Late Holocene and historical times. In Uruguay, the only record is stratigraphically questionable because the material has been lost. The present contribution describes the first materials with a precise stratigraphic context assigned to Didelphis cf. D. albiventris, based on comparative morphological and numerical analysis. The materials were unearthed from several outcrops of the Sopas Formation (Late Pleistocene, northern Uruguay) and consist of an associated skull and mandible, right hemimandible, and postcranial material. These findings allow us to discuss several aspects related to the biology and ecology of Didelphis. These animals, which exhibit a mixed diet, were able to feed at intermediate levels of the food chain in highly diverse environments during the Late Pleistocene.
Ameghiniana, 2010
Los estudios paleontológicos sobre las aves del Cuaternario de América del Sur son cuantitativame... more Los estudios paleontológicos sobre las aves del Cuaternario de América del Sur son cuantitativamente muy inferiores a aquellos referidos a los mamíferos y están centrados sobre regiones o sitios fosilíferos muy localizados (Tambussi et al., 1993; Tambussi, 1995). Las contribuciones resultan de esta manera muy escasas en relación con la amplia extensión de los afloramientos de esa antigüedad en la totalidad del continente. Las ornitofaunas cuaternarias mejor estudiadas provienen de los actuales territorios de Venezuela (Wetmore, 1935), Ecuador (Campbell, 1976), Perú (Campbell, 1979), Brasil (Winge, 1887), Uruguay (Tambussi et al., 2005) y Argentina (Ameghino, 1891; Moreno y Mercerat, 1891; Mercerat, 1897; Kraglievich y Rusconi, 1931; Tonni, 1973, 1980; Tambussi, 1995; Noriega, 1998). Asimismo, numerosas otras citas aisladas pueden encontrarse en las reseñas de Olson (1985), Cuello (1988), Tonni y Tambussi (1986) y Tambussi y Noriega (1996). Más recientemente, Tonni y Noriega (2001), Claramunt y Rinderknecht (2005) y Alvarenga et al. (2008) dieron a conocer registros de nuevos taxones de aves en el Pleistoceno de Argentina, Uruguay y Brasil, respectivamente. Surge de lo expuesto que el registro paleornitológico conocido para el actual territorio de Bolivia es sumamente pobre, restringiéndose a las aves coleccionadas en los niveles medios de la Formación Ñuapua (Hoffstetter, 1968). Estos niveles fosilíferos afloran en la quebrada homónima y son referibles al Holoceno temprano-medio (Marshall y Sempere, 1991; Pardiñas y Galliari, 1998). En la presente nota damos a conocer los resultados del análisis de una pequeña colección de aves con la misma procedencia geográfica y estratigráfica que la estudiada por Hoffstetter (1968), ampliando así el conocimiento paleornitológico acerca del Cuaternario sudamericano en general y el particularmente escaso registro de Bolivia.
Boreas, 2019
The aim of this contribution is to describe a femur (MCRS 199) assigned to Nothrotheriops sp. fro... more The aim of this contribution is to describe a femur (MCRS 199) assigned to Nothrotheriops sp. from the Late Pleistocene of Santa Fe Province (Argentina), and discuss the implications of this find in the context of the dispersal of ground sloths during the Great American Biotic Interchange. The specimen MCRS 199 is smaller than the femora referred to the North American species Nothrotheriops texanus and Nothrotheriops shastensis but shares several features with these species: (i) shape and position of the greater trochanter, (ii) development of the lesser trochanter, (iii) presence of connection between the third trochanter and the ectepicondyle, (iv) distal third of the femur wider, with ML/DW index of 1.93, and (v) location and relationship of the distal condyles. These similarities allow us to assign MCRS 199 to Nothrotheriops sp. The record of Nothrotheriops sp. from Santa Fe Province chronologically coincides with the earliest records of Nothrotheriops shastensis suggesting a broad geographical distribution of Nothrotheriops during the Late Pleistocene, ranging from 33–36°N (e.g. states of California and Arizona, USA) to 31°S (northern Salado River, Santa Fe Province, Argentina). Thus, Nothrotheriops have dispersed from North America (where Nothrotheriops has early records, Calabrian–Middle Pleistocene) to South America where localities bearing Nothrotheriops are Late Pleistocene in age. In addition, once in South America and probably during the Middle Pleistocene, Nothrotheriops probably gave rise to its sister taxon, Nothrotherium, with records from the Middle Pleistocene (e.g. 223 ka BP, northeastern Brazil) to the Late Pleistocene (e.g. 15 ka BP).Fil: Brandoni, Diego. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; ArgentinaFil: Vezzosi, Raúl Ignacio. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentin
Swiss Journal of Palaeontology
Nearctic ungulates such as artiodactyls, perissodactyls, and proboscideans arrived in South Ameri... more Nearctic ungulates such as artiodactyls, perissodactyls, and proboscideans arrived in South America during the Great American Biotic Interchange. Among them are camelids, cervids, tayassuids, equids, tapirids and gomphotherids. A historical collection of Nearctic ungulates from Pleistocene deposits of the Pampean region in Argentina is here studied and described. The collection consists of specimens collected by Santiago Roth in the nineteenth century and brought to Europe, where they are housed in the paleontological collections of the University of Zurich and the Natural History Museum of Geneva. Among the taxa reported here are Notiomastodon platensis,Lama guanicoe, Hemiauchenia paradoxa, Tayassu pecari, Morenelaphus sp., Hippidion cf. H. principale, Equus cf. E. neogeus, and other indeterminate gomphotherids, camelids, tayassuids, cervids, and equids. The exact stratigraphic position of these fossils collected more than 130 years ago is in many cases uncertain. The historical co...
Revista Mexicana De Ciencias Geologicas, Aug 1, 2011
Journal of Mammalian Evolution
Sloths represent one of the most successful South American clades that reached North America duri... more Sloths represent one of the most successful South American clades that reached North America during the Great American Biotic Interchange (GABI). At least four families are known from the Pleistocene of North America: Mylodontidae, Megalonychidae, Megatheriidae, and Nothrotheriidae. Members of the Nothrotheriidae are known from the Middle Miocene to the Pleistocene/Holocene transition in the Americas, but Nothrotheriops is the only genus in the family recorded in North America. Recently, femora with characteristic nothrothere morphology were recovered from Santa Fe, Argentina, and assigned to Nothrotheriops, thus greatly expanding the geographic distribution of this taxon. In Uruguay, records of Quaternary Nothrotheriidae are scarce, and previous reports are limited to the genus Nothrotherium. In this work, we describe a humerus from Arroyo del Vizcaíno (AdV), a ~30 ka site located in southern Uruguay, and assign it to the nothrotheriid Nothrotheriops sp. We also discuss several specimens from Uruguay originally assigned to Nothrotherium, which upon reexamination can be tentatively reassigned to Nothrotheriops sp. Furthermore, we employ stable isotope analysis to explore the climatic and dietary preferences of this taxon in South America. The new records are consistent with the materials reported from Argentina, thus providing new knowledge of the geographic distribution of the taxon, as well as its climatic and dietary preferences. Stable isotope results showed δ 13 C values consistent with diets based mainly on C 3 plants, similar to those published for N. shastensis in North America.
Journal of Mammalian Evolution, 2023
Sloths represent one of the most successful South American clades that reached North America duri... more Sloths represent one of the most successful South American clades that reached North America during the Great American Biotic Interchange (GABI). At least four families are known from the Pleistocene of North America: Mylodontidae, Megalonychidae, Megatheriidae, and Nothrotheriidae. Members of the Nothrotheriidae are known from the Middle Miocene to the Pleistocene/Holocene transition in the Americas, but Nothrotheriops is the only genus in the family recorded in North America. Recently, femora with characteristic nothrothere morphology were recovered from Santa Fe, Argentina, and assigned to Nothrotheriops, thus greatly expanding the geographic distribution of this taxon. In Uruguay, records of Quaternary Nothrotheriidae are scarce, and previous reports are limited to the genus Nothrotherium. In this work, we describe a humerus from Arroyo del Vizcaíno (AdV), a ~30 ka site located in southern Uruguay, and assign it to the nothrotheriid Nothrotheriops sp. We also discuss several specimens from Uruguay originally assigned to Nothrotherium, which upon reexamination can be tentatively reassigned to Nothrotheriops sp. Furthermore, we employ stable isotope analysis to explore the climatic and dietary preferences of this taxon in South America. The new records are consistent with the materials reported from Argentina, thus providing new knowledge of the geographic distribution of the taxon, as well as its climatic and dietary preferences. Stable isotope results showed δ 13 C values consistent with diets based mainly on C 3 plants, similar to those published for N. shastensis in North America.
La masa corporal de ejemplares de aves fósiles puede ser estimada mediante comparaciones con las ... more La masa corporal de ejemplares de aves fósiles puede ser estimada mediante comparaciones con las formas actuales, teniendo en cuenta que las medidas del fémur, el tibiotarso y el tarsometatarso son indicadoras del peso del animal. Estos huesos representarían una relación directa con la masa corporal, ya que proveen en distinto grado el sostén del cuerpo. En esta contribución, se calcula la masa corporal de ejemplares asignados a Procariama simplex Rovereto provenientes del Mioceno superior de Argentina, utilizando dos estimativos diferentes. El primero asume que existe similitud geométrica entre un ave fósil, cuya masa se pretende estimar, y una forma viviente análoga como Cariama cristata Linnaeus. El segundo modelo, más adecuado para su aplicación en aves, considera la influencia del tamaño o de la masa corporal sobre la forma y la función del esqueleto. Se basa en considerar la relación logarítmica entre la masa corporal y la circunferencia mínima de la diáfisis de los elementos ...
Revista Brasileira de Paleontologia, 2022
A new material of a Quaternary waterfowl is described here. The implications of this finding, in ... more A new material of a Quaternary waterfowl is described here. The implications of this finding, in the context of the dispersal of Anatidae in the past, are discussed. The specimen consists in a partial humerus coming from the Upper Pleistocene of austral Chaco from Santiago del Estero Province, Argentina. The specimen here described belongs to the tribe Cygnini, being larger than most members of the clade. The humerus shows different size than with other members of the tribe Cygnini, being larger than the humeri referred to the Andean goose (Oressochen melanopterus), the Sheldgeese of the genus Chloephaga, the Comb Duck (Sarkidiornis sylvicola), and larger than the Ruddy Shelduck (Tadorna ferruginea). However, the humerus have several anatomical characters indicating that it belongs to a basal anserine duck. These combinations of features allow us to assign this fossil to a species of waterfowl: Coscoroba coscoroba. This finding, it context with the history of the South American Cygn...
Alcheringa: An Australasian Journal of Palaeontology, 2017
Revista Mexicana de Ciencias …, 2011
Alcheringa: An Australasian Journal of Palaeontology, 2012
Vezzosi, R.I., iFirst article. First record of Procariama simplex Rovereto, 1914 (Phorusrhacidae,... more Vezzosi, R.I., iFirst article. First record of Procariama simplex Rovereto, 1914 (Phorusrhacidae, Psilopterinae) in the Cerro Azul Formation (upper Miocene) of La Pampa Province; remarks on its anatomy, palaeogeography and chronological range. Alcheringa, 1–13. ISSN 0311-5518.New records of Procariama simplex in central and northwestern Argentina are reported. The fossil material includes mandibular bones, cervical vertebrae and several elements of the fore and hindlimbs. After an exhaustive comparison of anatomical characters and morphometric analysis, the fossil specimens are assigned to the psilopterine Procariama simplex. The specimen from La Pampa Province represents the first record of a psilopterine in this central region of Argentina and derives from upper Miocene sediments of the Cerro Azul Formation. Lithological features and biostratigraphical data allow the host bed to be assigned to the Huayquerian faunal stage (late Miocene). The La Pampa record broadens the geographical distribution of Procariama simplex, which was previously restricted to northwestern Argentina.
Journal of Mammalian Evolution
Mastozoología neotropical, 2015
The Neotropical otter (Lontra longicaudis, Mustelidae, Carnivora) is defined as a generalist carn... more The Neotropical otter (Lontra longicaudis, Mustelidae, Carnivora) is defined as a generalist carnivore. Although it is a fish-crustacean feeder, rodents are ...
Journal of South American Earth Sciences, 2021
Abstract The fossil record of South American cathartids, with few exceptions, is largely restrict... more Abstract The fossil record of South American cathartids, with few exceptions, is largely restricted to Late Pleistocene and Holocene sites. This contribution provides for the first time fossil records of cathartids from Uruguay. The specimens reported here include an; almost complete fibula, an incomplete furcula, and the distal end of a tibiotarsus. The; first two specimens came from Late Pleistocene beds at two localities of from Northern Uruguay, and the last one comes from Late Pleistocene-Early Holocene beds from South-western Uruguay. All the specimens were associated with several megafaunal fossil remains. The systematic assignation and paleobiological implications of these scavenger birds are here discussed.
Journal of South American Earth Sciences, 2020
Abstract The fossil record of the genus Didelphis, despite its current diversity (6 species, 5 oc... more Abstract The fossil record of the genus Didelphis, despite its current diversity (6 species, 5 occurring in South America) and wide distribution (from southern Canada to Patagonia, Argentina), is very scarce. The oldest record of the genus in South America comes from Late Miocene sediments and the youngest records from the Late Holocene and historical times. In Uruguay, the only record is stratigraphically questionable because the material has been lost. The present contribution describes the first materials with a precise stratigraphic context assigned to Didelphis cf. D. albiventris, based on comparative morphological and numerical analysis. The materials were unearthed from several outcrops of the Sopas Formation (Late Pleistocene, northern Uruguay) and consist of an associated skull and mandible, right hemimandible, and postcranial material. These findings allow us to discuss several aspects related to the biology and ecology of Didelphis. These animals, which exhibit a mixed diet, were able to feed at intermediate levels of the food chain in highly diverse environments during the Late Pleistocene.
Ameghiniana, 2010
Los estudios paleontológicos sobre las aves del Cuaternario de América del Sur son cuantitativame... more Los estudios paleontológicos sobre las aves del Cuaternario de América del Sur son cuantitativamente muy inferiores a aquellos referidos a los mamíferos y están centrados sobre regiones o sitios fosilíferos muy localizados (Tambussi et al., 1993; Tambussi, 1995). Las contribuciones resultan de esta manera muy escasas en relación con la amplia extensión de los afloramientos de esa antigüedad en la totalidad del continente. Las ornitofaunas cuaternarias mejor estudiadas provienen de los actuales territorios de Venezuela (Wetmore, 1935), Ecuador (Campbell, 1976), Perú (Campbell, 1979), Brasil (Winge, 1887), Uruguay (Tambussi et al., 2005) y Argentina (Ameghino, 1891; Moreno y Mercerat, 1891; Mercerat, 1897; Kraglievich y Rusconi, 1931; Tonni, 1973, 1980; Tambussi, 1995; Noriega, 1998). Asimismo, numerosas otras citas aisladas pueden encontrarse en las reseñas de Olson (1985), Cuello (1988), Tonni y Tambussi (1986) y Tambussi y Noriega (1996). Más recientemente, Tonni y Noriega (2001), Claramunt y Rinderknecht (2005) y Alvarenga et al. (2008) dieron a conocer registros de nuevos taxones de aves en el Pleistoceno de Argentina, Uruguay y Brasil, respectivamente. Surge de lo expuesto que el registro paleornitológico conocido para el actual territorio de Bolivia es sumamente pobre, restringiéndose a las aves coleccionadas en los niveles medios de la Formación Ñuapua (Hoffstetter, 1968). Estos niveles fosilíferos afloran en la quebrada homónima y son referibles al Holoceno temprano-medio (Marshall y Sempere, 1991; Pardiñas y Galliari, 1998). En la presente nota damos a conocer los resultados del análisis de una pequeña colección de aves con la misma procedencia geográfica y estratigráfica que la estudiada por Hoffstetter (1968), ampliando así el conocimiento paleornitológico acerca del Cuaternario sudamericano en general y el particularmente escaso registro de Bolivia.
Boreas, 2019
The aim of this contribution is to describe a femur (MCRS 199) assigned to Nothrotheriops sp. fro... more The aim of this contribution is to describe a femur (MCRS 199) assigned to Nothrotheriops sp. from the Late Pleistocene of Santa Fe Province (Argentina), and discuss the implications of this find in the context of the dispersal of ground sloths during the Great American Biotic Interchange. The specimen MCRS 199 is smaller than the femora referred to the North American species Nothrotheriops texanus and Nothrotheriops shastensis but shares several features with these species: (i) shape and position of the greater trochanter, (ii) development of the lesser trochanter, (iii) presence of connection between the third trochanter and the ectepicondyle, (iv) distal third of the femur wider, with ML/DW index of 1.93, and (v) location and relationship of the distal condyles. These similarities allow us to assign MCRS 199 to Nothrotheriops sp. The record of Nothrotheriops sp. from Santa Fe Province chronologically coincides with the earliest records of Nothrotheriops shastensis suggesting a broad geographical distribution of Nothrotheriops during the Late Pleistocene, ranging from 33–36°N (e.g. states of California and Arizona, USA) to 31°S (northern Salado River, Santa Fe Province, Argentina). Thus, Nothrotheriops have dispersed from North America (where Nothrotheriops has early records, Calabrian–Middle Pleistocene) to South America where localities bearing Nothrotheriops are Late Pleistocene in age. In addition, once in South America and probably during the Middle Pleistocene, Nothrotheriops probably gave rise to its sister taxon, Nothrotherium, with records from the Middle Pleistocene (e.g. 223 ka BP, northeastern Brazil) to the Late Pleistocene (e.g. 15 ka BP).Fil: Brandoni, Diego. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; ArgentinaFil: Vezzosi, Raúl Ignacio. Provincia de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Universidad Autónoma de Entre Ríos. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción; Argentin