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			Ordenar por:  Relevância Autor Título Ano Registros recuperados: 734 Primeira ... 27 28 29 30 31 32 33 34 35 ... Última Metacercariae of Strigeidae Parasitizing Amphibians of the Chaco Region in Argentina Anais da ABC (AABC) HAMANN,MONIKA I.; FERNÁNDEZ,MARÍA V.; GONZÁLEZ,CYNTHYA E.. Abstract: The goal of the present study was to analyze the metacercariae found in adult amphibians collected in the Argentinean Chaco region. A total of 194 frogs, Leptodactylus chaquensis, Leptodactylus latinasus, and Lepidobatrachus laevis was examined for digeneans. Three different larval trematodes of the genus Strigea (Digenea, Strigeidae) were found infecting the liver, mesentery, body cavity, and muscle of frogs. These metacercariae are described and illustrated for the first time and provide new information on the composition of metacercariae in amphibians, thus contributing to the knowledge of larval trematodes biodiversity in the Neotropical region. We also present new information on the morphology and morphometry of strigeid metacercariae. Tipo: Info:eu-repo/semantics/article Palavras-chave: Trematoda; Metacercariae; Amphibian; Argentina. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100624 A new Cretaceous terrestrial ecosystem from Gondwana with the description of a new sauropod dinosaur Anais da ABC (AABC) Calvo,Jorge O.; Porfiri,Juan D.; González-Riga,Bernardo J.; Kellner,Alexander W.A.. A unique site at the northern area of Patagonia (Neuquén, Argentina) reveals a terrestrial ecosystem preserved in a detail never reported before in a Late Cretaceous deposit. An extraordinary diversity and abundance of fossils was found concentrated in a 0.5 m horizon in the same quarry, including a new titanosaur sauropod, Futalognkosaurus dukei n.gen., n.sp, which is the most complete giant dinosaur known so far. Several plant leaves, showing a predominance of angiosperms over gymnosperms that likely constituted the diet of F. dukei were found too. Other dinosaurs (sauropods, theropods, ornithopods), crocodylomorphs, pterosaurs, and fishes were also discovered, allowing a partial reconstruction of this Gondwanan continental ecosystem. Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinosauria; Titanosauria; Ecosystem; Taphonomy; Upper Cretaceous; Gondwana; Patagonia; Argentina. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000300013 Do precipitation and food affect the reproduction of brown brocket deer Mazama gouazoubira (G. Fischer 1814) in conditions of semi-captivity? Anais da ABC (AABC) Juliá,Juan P.; Peris,Salvador J.. The births of brown brocket deer ( Mazama gouazoubira) in a secondary lower montane forest called "yunga" in northwestern Argentina were compared with rainfall. Analyses were performed with rainfall and flower-fruit fall in an attempt to determine the possible importance of these seasonal variables in birthing. The births were not directly correlated with rainfall, but rather with the flower and fruit fall of exotic plant species. This may be related to favor the development of fawns, which eat the new and more digestible plant parts, accessible one month after their births.The non-seasonal births observed around the year could be related to the selection by the deer of some plant species that have been introduced into the region ( Prunus, Morus and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Birth phenology; Fruit; Rainfall. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300010 Speeds and stance of titanosaur sauropods: analysis of Titanopodus tracks from the Late Cretaceous of Mendoza, Argentina Anais da ABC (AABC) González Riga,Bernardo J.. Speed estimations from trackways of Titanopodus mendozensis González Riga and Calvo provide information about the locomotion of titanosaurian sauropods that lived in South America during the Late Cretaceous. Titanopodus ichnites were found at Agua del Choique, a newly discovered track site in the Loncoche Formation, Late Campanian-Early Maastrichtian of Mendoza, Argentina. This speed study follows the hypothesis of dynamic similarity proposed by Alexander. As a refinement of this method, a complementary equation is presented here based on an articulated titanosaurian specimen collected in strata that are regarded as correlative to those that have yielded Titanopodus tracks (Allen Formation, Neuquén Basin). This analysis indicates that hip height can be... Tipo: Info:eu-repo/semantics/article Palavras-chave: Speed; Sauropoda; Titanopodus; Cretaceous; Argentina. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100016 The exotic jumping snail Ovachlamys fulgens (Gude, 1900) (Gastropoda: Helicarionidae) in urban areas of the Upper-Paraná Atlantic Forest Anais da ABC (AABC) BELTRAMINO,ARIEL A.; VOGLER,ROBERTO E.; RUMI,ALEJANDRA; GUZMÁN,LEILA B.; MARTÍN,STELLA M.; PESO,JUANA G.. ABSTRACT The exotic land gastropod Ovachlamys fulgens (Gude, 1900), aka the jumping snail, was registered in Eldorado city, Misiones province, constituting the first documented record of that species in Argentina-and for all of South America as well. Identities of the individuals were confirmed through morphological examination, and by a DNA sequencing of the cytochrome oxidase subunit I gene. DNA sequences for the mitochondrial 16S-rRNA and the nuclear 18S-rRNA genes were also obtained from the morphologically-confirmed specimens to gain insights into the genetic background of this species in Argentina, and as additional markers for enhancing the rapidity of identification by governmental authorities who are responsible for managing the presence of exotic... Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Introduced species; Misiones province; Molecular markers; Nonnative snail. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401591 An integrated approach clarifies the cryptic diversity in Hypostomus Lacépède 1803 from the Lower La Plata Basin Anais da ABC (AABC) CARDOSO,YAMILA P.; BRANCOLINI,FLORENCIA; PROTOGINO,LUCILA; PARACAMPO,ARIEL; BOGAN,SERGIO; POSADAS,PAULA; MONTOYA-BURGOS,JUAN I.. Abstract Abstract: Hypostomus commersoni Valenciennes 1836, Hypostomus cordovae (Günther 1880) and Hypostomus laplatae (Eigenmann 1907) have been little studied since their original descriptions. This study shows a comprehensive review of these species from the Lower La Plata Basin, including their taxonomic history, distribution, color patterns, morphology, and ecological and molecular phylogenetic data. Morphological and phylogenetic analyses based on D-loop sequences suggested that H. commersoni can be separated into two subclades, or subgroups. Based on these results and on the non-overlapping distribution range of the two subclades, we conclude that they represent two distinct species, thereby revalidating H. spiniger. The results also suggest that H.... Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Brazil; Freshwater fishes; Molecular phylogenetics; Paraná Basin. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300604 Isoetes pedersenii, a new species from Southern South America Anais da ABC (AABC) Macluf,Cecilia; Meza Torres,Esteban I.; Solís,Stella M.. The name Isoetes pedersenii H.P. Fuchs (Lycophyta), a species known only from the Mburucuyá National Park, Corrientes, Argentina, is validated. Observations were carried out on herbarium material with stereoscopic, light and scanning electron microscopes. The species is described and typified. A diagnosis and discussion about its distribution and its relationship with the morphology of other species of Isoetes are provided. Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Corrientes; Isoetes; Lycophyta; New species. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200011 A new small deinonychosaur (Dinosauria: Theropoda) from the Late Cretaceous of Patagônia, Argentina Anais da ABC (AABC) Porfiri,Juan D.; Calvo,Jorge O.; Santos,Domenica dos. Here we report on a new small deinonychosaurian theropod, Pamparaptor micros gen. et sp. nov., from the Late Cretaceous of Patagônia, Argentina. Pamparaptor micros exhibits a pedal structure previously unknown among South Américan deinonychosaurians. The new material provides new evidence about the morphology and taxonomic diversity of Patagônian deinonychosaurs. Pamparaptor is the smaller non-avialae Patagônian deinonychosaur, probably with about 0.50-0.70 meters, long. The pedal construction resembles, that of Troodontid or basal Dromaeosaurids. Nevertheless, up to now, we considered Pamparaptor a peculiar Patagônian Dromaeosaurid with troodontid-like pes. Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Barreales Lake; Dromaeosauridae; Late Cretaceous; Patagônia; Unenlagiinae. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000100007 Description of the last instar larva and new contributions to the knowledge of the pupa of Dasyhelea mediomunda Minaya (Diptera, Culicomorpha, Ceratopogonidae) Anais da ABC (AABC) DÍAZ,FLORENTINA; ANJOS-SANTOS,DANIELLE; FUNES,AMPARO; RONDEROS,MARÍA M.. ABSTRACT The fourth instar larva of Dasyhelea mediomunda Minaya is described for the first time and a complete description of the pupa is provided, through use of phase-contrast microscope and scanning electron microscope. Studied specimens were collected in a pond connected to a small wetland "mallin" on the Patagonian steppe, Chubut province, Argentina. Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Dasyhelea mediomunda; Immature stages; Patagonian steppe. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501625 First record of the genus Choledocystus(Trematoda: Plagiorchiidae) for amphibians of the Chacoan region in Argentina Anais da ABC (AABC) HAMANN,MONIKA INES; LEÓN-RÈGAGNON,VIRGINIA; FERNÁNDEZ,MARÍA VIRGINIA; GONZÁLEZ,CYNTHYA ELIZABETH. Abstract This is the first record of the trematode Choledocystus incurvatum and Choledocystus elegans in Argentinean amphibians collected in two localities of the Chacoan region. The first trematode species was found infecting the small intestine of Pseudis paradoxa Linnaeus, captured near the city of Corrientes, Corrientes Province; the second species was found infecting the gall-bladder of Lepidobatrachus laevis Budgget, captured in Ingeniero Juárez, Formosa Province. Morphology of these species was studied in detail using light microscopy and scanning electron microscopy (SEM), and compared with previous studies of Brazilian and Venezuelan specimens. Morphological descriptions of these parasites are provided to supplement existing data. Choledocystus... Tipo: Info:eu-repo/semantics/article Palavras-chave: Trematoda; Choledocystus; Amphibians; Chacoan region; Argentina. Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100723 A new species of Microtetrameres (Nematoda, Tetrameridae) parasitizing Buteogallus urubitinga (Aves, Accipitridae) from northeastern Argentina Anais da ABC (AABC) DÍAZ,MARIANO Dueñas; DRAGO,FABIANA B.; NÚÑEZ,VERÓNICA. Abstract A new tetramerid nematode, Microtetrameres urubitinga n. sp., is described from specimens recovered from the proventriculus of the great black-hawk, Buteogallus urubitinga (Aves: Accipitridae), from Formosa Province, Argentina. The males of the new species are characterized by having spicules unequal (length ratio of spicules 1:3.8–5.9) and dissimilar in shape (right spicule with a simple tip, left spicule with a symmetrical bifurcated tip), caudal papillae arranged asymmetrically (two pairs precloacal and two pairs postcloacal) and cloacal lips highly protruded forming a tube. The gravid females are permanently coiled clockwise or counterclockwise in a spiral and having a tail tapering gradually to a sharp point, with a cuticular fold. This is... Tipo: Info:eu-repo/semantics/article Palavras-chave: Accipitridae; Argentina; Buteogallus urubitinga; Microtetrameres urubitinga n. sp.; Tetrameridae. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000602967 On the pterosaur remains from the Río Belgrano formation (Barremian), Patagonian Andes of Argentina Anais da ABC (AABC) Kellner,Alexander W.A.; Aguirre-Urreta,María B.; Ramos,Victor A.. Pterosaur remains from the Río Belgrano Formation, Santa Cruz Province, Argentina, were found close to the Estancia Río Roble, along with several ammonoids that indicate a Barremian age for those strata. The specimens (MACN-SC 3617) consist of one ulna and one element tentatively identified as a portion of a wing metacarpal. The ulna shows morphological affinities with the Pteranodontoidea (sensu Kellner 1996), particularly with the members of the Anhangueridae by having a well developed ventral crest close to the proximal articulation, and is tentatively referred to this pterosaur clade. The oldest record of the Anhangueridae, previously limited to the Aptian/Albian, is therefore extended to the Barremian. The Argentinean material is preserved in three... Tipo: Info:eu-repo/semantics/article Palavras-chave: Pterosauria; Río Belgrano Formation; Lower Cretaceous; Argentina. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000400007 Baalsaurus mansillai gen. et sp. nov. a new titanosaurian sauropod (Late Cretaceous) from Neuquén, Patagonia, Argentina Anais da ABC (AABC) CALVO,JORGE O.; RIGA,BERNARDO GONZALEZ. Abstract We describe a dentary of a new titanosaur sauropod, Baalsaurus mansillai, gen. et sp. nov. from the Late Cretaceous of Patagonia, Argentina. The material comes from the Portezuelo Formation, Neuquén Group. Titanosaur sauropods lower jaws are scarce and only nine taxa with dentaries have been described. There are two types of morphology in titanosaur dentaries; “L” shaped or “U” shaped based on the shape, without a phylogenetic issue. In this paper; we recognize a new taxa, Baalsaurus mansillai, represented by an “L” shaped dentary with three apomorphic characters that are not present in other taxa: dentary alveoli with 10 teeth in the anterior ramus, a ventrally and anteriorly inclined symphysis and a wide ventral Meckelian groove surrounded by a... Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Dinosauria; Neuquén; Sauropoda; Upper Cretaceous. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400506 Description of a sauropod dinosaur braincase (Titanosauridae) from the Late Cretaceous Rio Colorado Subgroup, Patagonia Anais da ABC (AABC) Calvo,Jorge O.; Kellner,Alexander W.. The fossil record of cranial material from titanosaurid sauropods is very poor and no complete skull has been described so far. Here we describe a new braincase (MUCPv-334) that was recovered from reddish sandstones of the Rio Colorado Subgroup (Late Cretaceous) of the region of Bajo del Añelo, approximately 20 km north of the town Añelo (Neuquén Province, Argentina). This specimen is attributed to the Titanosauridae based on the ventrally projected basipterygoid processes, a common condition shared by other titanosaurids. The robustness of MUCPv-334 together with an unusually expanded crista prootica and the presence of an anterior prolongation of the parasphenoid reaching the basal tubera were not reported in other members of the Titanosauridae,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Braincase; Titanosauridae; Late Cretaceous; Patagonia; Argentina. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000100015 Summer feeding ecology of Great Pampa-finches, Embernagra platensis at Laguna de Guaminí, Buenos Aires, Argentina Anais da ABC (AABC) Ferman,Laura M.; Montalti,Diego. The aim of this study was to assemble data on the summer feeding ecology of the Great Pampa-finch, Embernagra platensis at the Laguna de Guaminí, Buenos Aires, Argentina, and to explore the differences related to the dietary patterns for each sex between winter and summer when possible. The stomach contents of 43 birds were analyzed. The animal fraction was composed of Hymenoptera (45.1%), Coleoptera (32.4%), Lepidoptera (6.0%), Araneae (5%) and Orthoptera (3.2%). The application of the index of relative importance (IRI) resulted in 1490.4 for Coleoptera, 428.5 for Hymenoptera and 162.5 for Lepidoptera caterpillars. The vegetal fraction consisted of Triticum aestivum (26.9%), Cyperaceous (25%), Poaceae (Gramineae) (19.3%) and Panicum sp. (11.2%). The IRI... Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Embernagra platensis; Feeding ecology; Great Pampa-finch. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300014 Morphology of the axial skeleton of seven bat genera (Chiroptera: Phyllostomidae) Anais da ABC (AABC) GAUDIOSO,PABLO J.; DÍAZ,M. MÓNICA; BARQUEZ,RUBÉN M.. ABSTRACT Here we present detailed descriptions and comparisons of the axial skeleton of seven species of bats belonging to five subfamilies of Phyllostomidae of different trophic guilds. The material examined consisted of 34 complete skeletons of seven species. For five of the studied species, previous descriptions have not been conducted, and for the vampires only limited information is available, so that descriptions for these species are here completed. The axial skeleton has characters that allow grouping of the species phylogenetically of the same subfamily and by feeding habits. At the same time, there are characters that associate species from different subfamilies with different types of diet or ways to obtain food. Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Chiroptera; Description; Morphology; Phyllostomidae. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502341 Distribution and biological aspects of the introduced speciesMoina macrocopa (Straus, 1820) (Crustacea, Cladocera) in the semi-arid central region of Argentina Biota Neotropica Vignatti,Alicia María; Cabrera,Gabriela Cecilia; Echaniz,Santiago Andrés. Moina macrocopa is common in eutrophic water bodies. Two subspecies have been described: M. macrocopa macrocopa (Straus, 1820), whose original distribution was restricted to the Old World, and M. macrocopa americanaGoulden, 1968, recorded only in North America. In 1994, the species was found in Bolivia, and in 1997 it was found in the northeast of Argentina. As the specimens belonged to M. macrocopa macrocopa in both cases, the authors suggested that it may have been introduced from the Old World by anthropogenic means. The aim of this study was to assess the distribution of M. macrocopa in La Pampa (Argentina), and provide information on its population characteristics under natural conditions. The species was recorded in six out of more than 100 water... Tipo: Info:eu-repo/semantics/article Palavras-chave: Argentina; Temporary lakes; Cladocera; Moina macrocopa; Invasive species. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300086 Efectos de la temperatura sobre el crecimiento individual y formación de zooides en Stylaria lacustris (Linnaeus, 1767) (Oligochaeta, Naididae) Biota Neotropica Armendáriz,Laura C.. Los cultivos realizados con S. lacustris demostraron que la temperatura juega un papel de importancia en la tasa de la reproducción, en cuanto al número de zooides producido por individuo así como también al tamaño alcanzado por los mismos. Por otro lado, regularía la tasa de crecimiento y la reproducción sexual, dando lugar a la madurez de los individuos cuando aumenta la temperatura. El tiempo de vida promedio de los individuos inmaduros se estimó en 15 días, siendo este valor independiente de la temperatura utilizada en los cultivos. Los individuos maduros vivieron en promedio 37 días. La supervivencia en S. lacustris fue decreciendo gradualmente, según una curva de tipo lll. La expectativa de vida presentó su pico a la edad de 16 días y se mantuvo... Tipo: Info:eu-repo/semantics/article Palavras-chave: Cultivos; Reproducción asexual; Argentina. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000200008 Accidentes con escorpiones en la ciudad de posadas, Provincia de Misiones, Argentina, durante el año 2002 Biota Neotropica Stetson,Roberto E.. Con el objeto de conocer el tipo y modo en que se producen los accidentes con escorpiones en la ciudad de Posadas, se realizaron estudios, que comprendieron el análisis de: planillas de consultas médicas en el Sector de Emergencias de dos de los principales hospitales de la ciudad (Hospital Ramón Madariaga y el Hospital de Pediatría de Autogestión), Fichas de denuncia de accidentes con animales venenosos no ofidicos y la identificación de escorpiones que participaron en los accidentes. Los resultados obtenidos durante el año 2002, se presentan discriminado según: número de caso, meses del año, especies involucradas, tipos de accidentes, síntomas más frecuentes, tratamientos empleados, relación porcentual con otros animales venenosos no ofidicos, sexos de... Tipo: Info:eu-repo/semantics/article Palavras-chave: Accidentes; Escorpiones; Posadas; Misiones; Argentina. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032005000200022 Bacillariophyceae del complejo lagunar Vilama (Jujuy, Argentina) Boletín de la Sociedad Maidana,Nora I.; Seeligmann,Claudia; Morales,Marcelo. Con el objetivo general de continuar con el relevamiento de la flora diatomológica en cuerpos de agua de alta montaña, en enero de 2005 se obtuvieron muestras de agua de 12 humedales del Complejo Lagunar Vilama (4500 m snm) en la provincia de Jujuy. Con esta contribución se incrementa el conocimiento de la flora de diatomeas para este tipo de ambientes. Se identificaron un total de 43 géneros y 137 taxones infragenéricos, de los cuales 6 son mencionados por primera vez para el país y se describe una especie nueva Staurophora vilamae. Se discute también la relación entre la riqueza de especies con algunas características ambientales. Tipo: Info:eu-repo/semantics/article Palavras-chave: Diatomeas; Humedales; Vilama; Jujuy; Argentina. Ano: 2009 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722009000200004 Registros recuperados: 734 Primeira ... 27 28 29 30 31 32 33 34 35 ... Última

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