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The discovery of a presbyornithid (Aves, Anseriformes) from the Vaca Mahuida Formation is reported. The formation crops out at Sierra El Fresco, southeast of Puelen (La Pampa, Argentina). This occurrence indicates that the deposition of... more
The discovery of a presbyornithid (Aves, Anseriformes) from the Vaca Mahuida Formation is reported. The formation crops out at Sierra El Fresco, southeast of Puelen (La Pampa, Argentina). This occurrence indicates that the deposition of the formation dates from the late Paleocene-middle Eocene; the presence of shallow, brackish-water environments is inferred. KEY WORDS. Argentina. La Pampa Province. Paleogene. Aves. Presbyornithidae. Palaeoenvironments.
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Una creencia m uy clasi ca en tre los zoologos es la de considerar a las aves com o el g rupo m ejor conocido de ver teb rados vivientes. En verdad, esto no esta m uy alejado de la realidad. C om o lo m en cio n a Feduccia (1978), se d... more
Una creencia m uy clasi ca en tre los zoologos es la de considerar a las aves com o el g rupo m ejor conocido de ver teb rados vivientes. En verdad, esto no esta m uy alejado de la realidad. C om o lo m en cio n a Feduccia (1978), se d eb e funda m e n ta lm e n te a d o s ra z o n e s . Por un lado, la m ayoria de las aves son de habitos d iurnos (es decir que despliegan sus activi d a d e s p r in c ip a le s d u ra n te el dia) po r lo que resultan de facil observacion; adem as son esteti cam en te llam ativas y p o p u la res. Estan re lac io n ad as d esd e tiem pos rem otos a las activida des del h o m b re q u ien las ha u tilizado com o am uletos, sim bolos divinos o aun com o p re ciados objetos de caza. Por otro lado, la conoci da teoria de la evo lucion p o r se le c c io n n a tu ra l, fo rm u la d a por el naturalista ingles Charles Darwin, esta basicam ente fun d a m e n ta d a en el e s tu d io e x haustivo de palom as dom esti cas y su variedad en pob...
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Abstract. This study analyzes a collection of fossil mammals from the Salicas Formation in the El Degolladito area, La Rioja Province, Argentina. The materials reported herein were recovered from two sites (site 1 and site 2). Reported... more
Abstract. This study analyzes a collection of fossil mammals from the Salicas Formation in the El Degolladito area, La Rioja Province, Argentina. The materials reported herein were recovered from two sites (site 1 and site 2). Reported mammals are Macrochorobates Scillato-Yané, Chasicotatus Scillato-Yané, and Hoplophorini indet. (Xenarthra, Cingulata); Paedotherium minor Cabrera, cf. Pseudotypotherium Ameg-hino (Notoungulata, Typotheria); Neobrachytherium Soria (Litopterna, Lopholipterna); Orthomyctera Ameghino, cf. Cardiomys Ameghino, Lagostomus (Lagostomopsis) Kraglievich, and Octodontidae indet. (Rodentia, Caviomorpha). This new mammalian assemblage, together with one previously recorded, has several taxa in common with mammalian associations from Central Argentina (i.e., La Pampa Province). Among those coming from Northwestern Argentina, the major affinity is with the El Jarillal Member (Chiquimil Formation) and then the Andalhuala Formation (both in Catamarca Province). The Sal...
The early-middle Miocene continental Cerro Boleadoras Formation (CBF) crops out in the area of Cerro Boleadoras and Cerro Plomo on the western slope of the Meseta del Lago Buenos Aires, northwestern Santa Cruz Province, Argentina. The... more
The early-middle Miocene continental Cerro Boleadoras Formation (CBF) crops out in the area of Cerro Boleadoras and Cerro Plomo on the western slope of the Meseta del Lago Buenos Aires, northwestern Santa Cruz Province, Argentina. The lower levels of the CBF consist of laterally extensive medium to pebbly sandstone beds with trough cross-bedding, interpreted as fluvial channel deposits, interbedded with tabular fine-grained floodplain deposits. Recent fieldwork provided fossil vertebrates from these levels with an estimated age between ~16.5 Ma and 15.1 Ma (late Burdigalian-early Langhian). The studied section temporally overlaps with the middle or upper sections of the Santa Cruz Formation (SCF) in the Austral-Magallanes Basin of southern Patagonia, the Río Frías Formation in Chile, and the lower Collón Curá Formation of northern Patagonia. We compile an integrated faunal list for this locality, including specimens from previous collections, and discuss its chronological and paleoe...
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Fil: Noriega, Jorge Ignacio. Provincia de Entre Rios. Centro de Investigaciones Cientificas y Transferencia de Tecnologia a la Produccion. Universidad Autonoma de Entre Rios. Centro de Investigaciones Cientificas y Transferencia de... more
Fil: Noriega, Jorge Ignacio. Provincia de Entre Rios. Centro de Investigaciones Cientificas y Transferencia de Tecnologia a la Produccion. Universidad Autonoma de Entre Rios. Centro de Investigaciones Cientificas y Transferencia de Tecnologia a la Produccion. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Santa Fe. Centro de Investigaciones Cientificas y Transferencia de Tecnologia a la Produccion; Argentina
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Se reporta el primer registro paleontológico de Dusicyon gymnocercus (Fischer, 1814) procedente de la Formación Arroyo Feliciano (Edad Lujanense; Pleistoceno Tardío-Holoceno Temprano) de la provincia de Entre Ríos, Argentina. El ejemplar... more
Se reporta el primer registro paleontológico de Dusicyon gymnocercus (Fischer, 1814) procedente de la Formación Arroyo Feliciano (Edad Lujanense; Pleistoceno Tardío-Holoceno Temprano) de la provincia de Entre Ríos, Argentina. El ejemplar (CICYTTP-PV-M-22) consiste en un cráneo completo sin mandíbula cuya morfología cráneo-dentaria es indistinguible de la especie viviente Dusicyon gymnocercus. El tamaño general del cráneo y las medidas cráneo-dentarias tomadas se encuentran dentro del rango de variación de Dusicyon gymnocercus. Los análisis multivariados permitieron llegar a la misma conclusión. Este constituye el primer registro de un cánido para el Lujanense de Entre Ríos y la Mesopotamia Argentina y amplía la distribución geográfica de Dusicyon gymnocercus durante el Lujanense.
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A major barrier to advancing ornithology is the systemic exclusion of professionals from the Global South. A recent special dossier, Advances in Neotropical Ornithology, and a shortfalls analysis therein, unintentionally followed a... more
A major barrier to advancing ornithology is the systemic exclusion of professionals from the Global South. A recent special dossier, Advances in Neotropical Ornithology, and a shortfalls analysis therein, unintentionally followed a long-standing pattern of highlighting individuals, knowledge, and views from the Global North, while largely omitting the perspectives of people based within the Neotropics. Here, we review problems with assessing the state of Neotropical ornithology through a northern lens, including discovery narratives, incomplete (and biased) understanding of history and advances, and the promotion of agendas that, while currently popular in the north, may not fit the needs and realities of Neotropical research. We argue that future advances in Neotropical ornithology will critically depend on identifying and addressing the systemic barriers that hold back ornithologists who live and work in the Neotropics: unreliable and limited funding, exclusion from international ...
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The diverse genus Sporophila has a complex systematic history. A new dark-collared form of Sporophila seedeater, herein described on the basis of three adult males, resembles male S. ruficollis but has a dark nape and rufous back. We... more
The diverse genus Sporophila has a complex systematic history. A new dark-collared form of Sporophila seedeater, herein described on the basis of three adult males, resembles male S. ruficollis but has a dark nape and rufous back. We informally name the new form 'caraguata' for its preferred habitat. We tested four hypotheses regarding the systematic situation of the 'caraguata' form: valid species, hybrid S. ruficollis × S. cinnamomea, colour morph of S. cinnamomea, and colour morph of S. ruficollis. Vocally and ecologically, the 'caraguata' form cannot be diagnosed from S. ruficollis. This evidence strongly suggests that S. 'caraguata' is a colour morph of S. ruficollis, although a hybrid origin is hard to assess and cannot be discarded. Sporophila ruficollis differs in preferred habitat, plumage and vocalisations from the rest of the capuchinos, and must be considered a valid species. The pattern of morphological variation exhibited by dark-throate...
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The fossil record of the family Falconidae is poor and fragmentary. Extinct representatives from South America include the late early Miocene (Santacrucian) Thegornis musculosus and Thegornis debilis. Both species were originally... more
The fossil record of the family Falconidae is poor and fragmentary. Extinct representatives from South America include the late early Miocene (Santacrucian) Thegornis musculosus and Thegornis debilis. Both species were originally described as Falconidae and afterwards moved to Accipitridae Circinae or Buteoninae. The analysis of a very well preserved and complete specimen of T. musculosus with similar stratigraphic and geographic provenances of the type material (lower levels of Santa Cruz Formation, coast of Patagonia, Argentina) corroborates the validity of the genus and its falconid affinities. The skull and postcranial morphology exhibit strong resemblances with the open-savannah inhabiting Herpetotheres and the forest-dwelling Micrastur (Herpetotherinae) but differ substantially from Falconinae (Falconini plus Caracarini). Detailed comparisons with a broad arrange of falconiform taxa in a cladistic framework, confirm its phylogenetic placement within the Herpetotherinae and sis...
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The terrestrial tortoise clade Chelonoidis is endemic to the South American continent and nearby islands. Three continental species are currently recognized that inhabit three distinct habitats. The red-footed tortoise (C. carbonaria) and... more
The terrestrial tortoise clade Chelonoidis is endemic to the South American continent and nearby islands. Three continental species are currently recognized that inhabit three distinct habitats. The red-footed tortoise (C. carbonaria) and yellow-footed tortoise (C. denticulata) are often sympatric tropical to semi-tropical taxa, but the former taxon generally prefers open and wet savannahs, whereas the latter distinctly prefers permanent and wet forest cover. In contrast, the Chaco Tortoise, C. chilensis, is arid-adapted and lives along the eastern dry slopes of the southern Andes (Ernst and Barbour, 1989). The diverse group of generally dry-adapted tortoises from the Galapagos Islands is currently thought to be the gigantic sisters of C. chilensis (Caccone et al., 1999).
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Research Interests: Geography, Paleontology, Humanities, Vertebrate Paleontology, Mammals, and 13 moreLate Miocene, Antropología, South America, América del Sur, Paleobiología, Bioestratigrafía, Paleontología, Paleoclimatología, Enseñanza - Aprendizaje Ciencias Naturales Y Exactas, Paleoecología, Neógeno, Palabras Clave: BIM, and Cenozoico
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Research Interests: Geography, Paleontology, Ornithology, Biology, Ecology, and 13 moreVertebrate Palaeontology, Vertebrate Evolution, Vertebrate Paleontology, Antarctic Geology, Antarctica, Birds of prey, Birds, Paleontologia de Vertebrados, Bird evolution and taxonomy, Paleontologia, Neotropical ornithology, Paleornithology, and Ornitología
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ABSTRACT: Eocene penguin remains from Seymour Island (Antarctica) are so far the old− est−known record of extinct Sphenisciformes. Rich Argentine and Polish collections of pen− guin bones from the La Meseta Formation are taxonomically... more
ABSTRACT: Eocene penguin remains from Seymour Island (Antarctica) are so far the old− est−known record of extinct Sphenisciformes. Rich Argentine and Polish collections of pen− guin bones from the La Meseta Formation are taxonomically revised on tarsometatarsal ...
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Food habits of the Barn Owl (Tyto alba) were studied at a Cis‐Andean Locality near Trevelin, Chubut, Argentina. Three hundred and three prey items in 107 pellets were analysed. Rodents were predominant, mainly those from the Patagonian... more
Food habits of the Barn Owl (Tyto alba) were studied at a Cis‐Andean Locality near Trevelin, Chubut, Argentina. Three hundred and three prey items in 107 pellets were analysed. Rodents were predominant, mainly those from the Patagonian steppe, i.e. Reithrodon auritus (30.6%), Eligmodontia typus (29.3%), and Oryzomys longicaudatus (18.4%). Frogs and birds were represented at low rates. Tyto alba is