Yamila Paula Cardoso

National Scientific and Technical Research Council | conicet · CCT La Plata

The aim of the present contribution is to review the taxonomy of the loricariid Sturisoma in the La Plata basin. The original description of the species S. barbatum is analyzed and compared to Regan’s later description of S. robustum. We noticed that Kner’s illustrations may have influenced the description by Regan and other later authors, leading...

Among the Neotropical fish fauna, suckermouth armored catfishes (Hypostomus - Loricariidae) stands out as one of the most difficult groups to diagnose morphologically. So the use of different molecular markers, as is the case of cytogenetics, has been fundamental for a precise identification of some species. In the present study, we characterize th...

Specimens of Imparfinis were recently collected in northwestern Argentina from the Bermejo River basin (Salta and Jujuy Provinces), del Valle River (Salta Province) and Horcones River (Santiago del Estero Province). An integrative approach to taxonomy, combining a detailed morphological study and molecular phylogenetic analyses, was applied in orde...

This study investigates a contact zone between two silverside fish species (marine Odontesthes argentinensis and freshwater O. bonariensis) in the estuarine Mar Chiquita lagoon along the Atlantic coast in Argentina (MChL), in which intermediate morphs had been reported. It has been suggested that admixture and introgression occur in MChL between th...

We conducted a revision of the Neotropical genus Acrobrycon . A previous study synonymized the species, A. ipanquianus , distributed from the western portion of the Amazon River to the north-western region of the La Plata River Basin, and A. tarijae , with type locality in the Lipeo River in Bolivia. We revisited this result by collecting new morph...

We conducted a review of the Neotropical genus Acrobrycon . A previous study synonymized the two recognized species in the genus: A. ipanquianus , distributed from the western portion of the Amazon River to the northwest region of the La Plata River Basin, and A. tarijae , described from the Lipeo River in Bolivia. We revisited this result by colle...

The Amazon is probably the most diverse realm on Earth, and is considered to be the primary source of diversity and a center of dispersal for Neotropical terrestrial organisms. Yet, the assumption that the Amazon basin is a primordial place of fish species origination and dispersal into other drainages still need to be tested. We addressed this iss...

• The distribution of genetic diversity across a species distribution range is rarely homogeneous, as the genetic structure among populations is related to the degree of isolation among them, such as isolation by distance, isolation by barrier, and isolation by environment. • Jenynsia lineata is a small viviparous fish that inhabits a wide range of...

Distribution history of the widespread Neotropical genus Hypostomus to shed light on the processes that shaped species diversity. We inferred a calibrated phylogeny; ancestral habitat preference, ancestral areas distribution, and the history of dispersal and vicariance events of this genus. The phylogenetic and distributional analyses indicate that...

We present a systematic review of the extinct species included in the family Caenolestidae, one of the few South American metatherian groups that has survived to the present. We perform a cladistic analysis based on a data matrix consisting of all extant and extinct species that have been referred to this family, 100 morphological characters and tw...

Rivers and lake systems in the southern cone of South America have been widely influenced by historic glaciations events, carrying important implications on the evolution of aquatic organisms including prompting transitions between marine and freshwater habitats and by triggering hybridization among incipient species via waterway connectivity and s...

With 149 currently recognized species, Hypostomus is one of the most species-rich catfish genera in the world, widely distributed over most of the Neotropical region. To clarify the evolutionary history of this genus, we reconstructed a comprehensive phylogeny of Hypostomus based on four nuclear and two mitochondrial markers. A total of 206 specime...

Actualmente la biodiversidad íctica conocida del Parque Nacional Iguazú comprende 104 especies, de las cuales dos corresponden a especies de “dientudos” del género Oligosarcus: O. longirostris y O. menezesi. En esta contribución se da a conocer una tercera especie de este género registrada dentro de dicho parque: Oligosarcus pintoi. Este nuevo hall...

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 ecol...

The genus Rhamdella is included in the family Heptapteridae and comprises six species distributed in Argentina, Brazil and Bolivia. Rhamdella aymarae was originally described from the Itiyuro River, an arheic basin in the North of Salta, Argentina. According to a proposed phylogenetic based on morphological characters, R. aymarae and R. rusbyi are...

With an estimate of around 9,000 species, the Neotropical region hosts the greatest diversity of freshwater fishes of the world. Genetic surveys have the potential to unravel isolated and unique lineages and may result in the identification of undescribed species, accelerating the cataloguing of extant biodiversity. In this paper, molecular diversi...

By means of an integrative taxonomic approach, a new species of the H. malabaricus group from the Río de La Plata basin is described. Hoplias argentinensis, new species, is characterized by: 17-19 predorsal scales, 42-43 vertebrae, 20 scales around caudal peduncle, no distinctive brown bands in lower jaw, last series of vertical scales on caudal fi...

Austrolebias wichi, new species, is herein described from seasonal ponds of the Bermejo river basin in the Western Chacoan district in northwestern Argentina. This species was found in a single pond, a paleochannel of the Bermejo River, which is seriously disturbed by soybean plantations surrounding it. Despite intensive sampling in the area, this...

Character matrix used for the phylogenetic analysis. (PDF)

List of material examined. (PDF)

Bayesian Inference (BI) of cyt b sequences. (PDF)

Hypostomus is one of the most diverse genus of South American freshwater catfishes. In Argentina, Hypostomus commersoni Valenciennes, 1836 is distributed throughout the major river networks of the La Plata River basin and in the Pampa Plain. The recent record of H. commersoni in the Langueyú stream, represents the southernmost occurrence for this s...

This study confirms the presence of two species of the non-native mosquitofish Gambusia in Argentina. The risks that they represent to native biota, their potential dispersal in the region, and their effectiveness in mosquito larvae control are discussed.

Glanidium ribeiroi fue descrito para la cuenca del río Iguazú en el estado de Paraná, Brasil. En Argentina, la especie fue citada para las cuencas del río Iguazú y del arroyo Urugua-í en Misiones; y para algunos tributarios del río Paraná medio, como el arroyo Cuña Pirú en Misiones y el río Salado en Santa Fe. Luego de una revisión crítica de todos...

Hypostomus formosae, new species, is described from the Paraguay River Basin and H. boulengeri is redescribed. Morphological and molecular analyses show that these two species belong to the ‘H. plecostomus species group’. Hypostomus formosae can be distinguished from H. boulengeri by having the tip of the snout completely covered with small plates...

Abstract: Trichomycterus barbouri (Eigenmann, 1911) is a little-known species with a discontinuous distribu- tion from the Beni river in Bolivia, in the Amazon river basin, to northwestern and central Argentina, in the río de la Plata basin. Here, we describe new records of T. barbouri from three rivers of the chaco-pampean plain, two in the Santia...

El territorio misionero representa solo el 0,8% de la superficie de Argentina. Sin embargo, goza de la mayor diversidad biológica del país. Podemos estimar que la ictiofauna continental que vive en dicho territorio corresponde a más del 40% de la diversidad registrada para toda Argentina. No obstante, los datos actuales sobre la riqueza de especies...

San Luis province presents arheic and endorheic basins that are poorly understood in terms of their ichthyological composition. The samples taken recently from the main basins of this province have yielded data of undisputed biogeographic value for the knowledge of the ichthyofauna of San Luis, as well as for drawing up lists of species for watersh...

Corydoras polystictus has been reported for Argentina only from the records published by Lüling in 1980 and 1982 from the río Gualeguay, an affluent of the lower río Paraná in the province of Entre Ríos. This author stated that the distribution of this species in Argentina would be linked to the middle and lower río Paraná basin. In this note, we p...

En la presente contribución se da a conocer la presencia de Corydoras ehrhardti Steindachner, 1910 en Argentina. Los materiales asignados a esta especie fueron colectados en la provincia de Misiones en el cauce del río San Antonio, el cual forma parte de la cuenca del río Iguazú. Corydoras ehrhardti constituye la séptima especie del género que se c...

Squirrels have been traded in the pet market for several decades, and numerous species have established in the wild. The Asiatic species Callosciurus erythraeus and Callosciurus finlaysonii have been introduced into other parts of Asia, in Europe and South America. In this study, (1) we conducted a genetic characterization of C. erythraeus introduc...

Ctenomys (tuco‐tuco) is the most numerous genus of South American subterranean rodents and one of the most genetically diverse clades of mammals known. In particular, the genus constitutes a very interesting model for evolutionary studies of genetic divergence and conservation. Ctenomys magellanicus is the southernmost species of the group and the...

Despite recent taxonomic evaluations of Mephitidae and North American hog-nosed skunks, southern South American species of Conepatus have not been thoroughly examined in a systematic context. Conepatus chinga and Conepatus humboldtii were described more than 150 years ago, based on external characters such as hair coloration and size. Although hist...

Within the Loricariidae, the genus Hypostomus is one of the most diversified freshwater catfish groups. Using new sequence data from the mitochondrial Control Region (D-loop) we examined the phylogeny of this genus. Our phylogenetic analyses suggest that, in the Paraná river basin, species diversity in the genus Hypostomus has been shaped by two pr...

The present work extends to Argentina the distribution of Hypostomus aspilogaster originally described from Uruguay River in southern Brazil. The examined specimens were sampled in the stream Mandisoví Grande, affluent of Uruguay River in Entre Ríos province, and in Punta Lara, from Río de la Plata basin, in Buenos Aires province, Argentina. This r...

Neotropical freshwater fishes have reached an unrivalled diversity, organized into several areas of endemism, yet the underlying processes are still largely unknown. The topographical and ecological characteristics of the Guyanas Region make it an ideal area of endemism in which to investigate the forces that have shaped this great diversity. This...