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1. Re-description of Xyliphius barbatus (Siluriformes, Aspredinidae), with comments on osteology and distribution

Author: Guillermo E. Terán, Alejandro Méndez-López, Mauricio F. Benitez, Wilson S. Serra, Sergio Bogan, and Gastón Aguilera
Subjects: Biology (General), QH301-705.5
Abstract: The banjo catfish, Xyliphius barbatus, belongs to the Aspredinidae family and typically inhabits the main channels of medium to large rivers in the La Plata River basin. The mimetic coloration with the substrate and the benthic lifestyle likely contribute to the challenge of sampling this species, resulting in its underrepresentation in museums and ichthyological collections. In fact, the original description of X. barbatus was based solely on two specimens. Consequently, little is known about its osteology, distribution, and phylogenetic relations. In this work, these information gaps are filled and the distributional range for X. barbatus is extended to northwestern Argentina.
Published: 2024
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2. Sorpresivo hallazgo del gobio Shimofuri (Tridentiger bifasciatus) en Sudamérica, reporte de un nuevo pez exótico en las costas de Argentina

Author: Sergio Bogan
Subjects: Peces, Especies exóticas, Gobiidae, Pehuen-co, Buenos Aires, Argentina, Ecology, QH540-549.5, Zoology, QL1-991
Abstract: El gobio Shimofuri (Tridentiger bifasciatus) es originario de la costa noroeste del Pacífico de Asia. Este pez fue registrado como especie exótica en 1985 en California, EE. UU., y ahora se considera establecido y extendiendo su distribución en varias cuencas y embalses de Norteamérica. En 2023 fue reportada por primera vez en Europa y ahora la confirmamos para América del Sur. Los especímenes aquí comunicados fueron colectados en el intermareal de Pehuen-co, sudeste de la provincia de Buenos Aires, Argentina. Las especies exóticas son uno de los principales factores que contribuyen a la disminución de las especies nativas, razón por la cual resulta importante hacer conocer los nuevos registros y motivar mayores estudios sobre el estatus de esta especie.
Published: 2023
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3. Molecular and morphological evidence revalidates Acrobrycon tarijae (Characiformes, Characidae) and shows hidden diversity

Author: Yanina F. Briñoccoli, Sergio Bogan, Dahiana Arcila, Juan J. Rosso, Ezequiel Mabragaña, Sergio M. Delpiani, Juan Martín Díaz de Astarloa, and Yamila P. Cardoso
Subjects: Zoology, QL1-991
Abstract: 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 morphometric, meristic, and genetic data (COI mitochondrial gene) for 24 individuals distributed along La Plata River Basin in Argentina, and discussed our results in the context of multiple biogeographic processes of isolation in that basin. Our results revealed a more complex history of diversification and geographic distribution across Acrobrycon species than previously suspected, probably associated with multiple biogeographic processes of isolation in La Plata River Basin. We present new evidence that led us to reconsider the validity of A. tarijae, which is distinguishable from A. ipanquianus by the number of vertebrae (37–39 vs. 41–42) and pleural ribs (12–13 vs. 14). These results were also supported by our molecular analyses that revealed a genetic divergence >4% between A. ipanquianus and A. tarijae. We also identified two main genetic clusters within A. tarijae: the first cluster consisted of specimens from the Bermejo, Pilcomayo, Itiyuro and Juramento river basins (northern Argentina); and the second cluster included specimens from the southernmost basins, such as the Salí River in Tucumán, Cuarto River in the province of Cordoba and the Quinto River in the province of San Luis. Our results suggest that the genetic structure observed in A. tarijae is the result of the type of drainage (endorheic vs. exorheic) and geographical distance.
Published: 2022
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4. Processes that drive the population structuring of Jenynsia lineata (Cyprinidontiformes, Anablepidae) in the La Plata Basin

Author: Yanina F. Briñoccoli, Luiz Jardim de Queiroz, Sergio Bogan, Ariel Paracampo, Paula E. Posadas, Gustavo M. Somoza, Juan I. Montoya‐Burgos, and Yamila P. Cardoso
Subjects: basin fragmentation, COI, genetic structure, intraspecific variation, isolation, Ecology, QH540-549.5
Abstract: Abstract 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 habitats in South America. To decipher the isolation processes that drive population structuring in J. lineata, we analyzed 221 sequences of the mitochondrial cytochrome c oxidase I gene (COI), from 19 localities. Then, we examined the influence of the three most common types of isolation in order to explain the genetic variation found in this species. Our results revealed a marked structuration, with three groups: (a) La Plata/Desaguadero Rivers (sampling sites across Argentina, Uruguay, and Southern Brazil), (b) Central Argentina, and (c) Northern Argentina. A distance‐based redundancy analysis, including the explanatory variables geographical distances, altitude, latitude, and basin, was able to explain up to 65% of the genetic structure. A variance partitioning analysis showed that the two most important variables underlying the structuration in J. lineata were altitude (isolation by environment) and type of basin (isolation by barrier). Our results show that in this species, the processes of population diversification are complex and are not limited to a single mechanism. The processes that play a prominent role in this study could explain the high rate of diversity that characterizes freshwater fish species. And these processes in turn are the basis for possible speciation events.
Published: 2021
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5. Fossil fishes and anurans from the Miocene of Rio Chico and Cerro Zeballos, Chubut Province, Argentina

Author: FEDERICO L. AGNOLÍN, SERGIO BOGAN, and LAUREANO R. GONZALEZ RUIZ
Subjects: Percichthyidae, Calyptocephalellidae, Miocene, Collón Curá Formation, Patagonia, Argentina, Science
Abstract: Abstract The fossil record of freshwater fishes and anurans from the Miocene in Patagonia is relatively patchy, a large number of specimens remaining undescribed. The aim of the present contribution is to describe a fossil association of percomorphacean fishes and calyptocephalellid anurans from the early to late Miocene Collón Curá Formation, at Chubut province, Patagonia, Argentina. In spite of being represented by several specimens, both anurans and fishes show a very low taxonomic diversity. This pattern matches with other fossil sites from the Cenozoic of Patagonia, as well as with the extant Patagonian batrachofaunas and ichthyofaunas. The fossil record of frogs and fishes in Patagonia is represented by few lineages that have a large evolutionary history in the area, and occasionally can be traced up to the Late Mesozoic.
Published: 2021
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6. A Pleistocene freshwater ichthyofaunal assemblage from central Argentina: What kind of fishes lived in the Pampean lagoons before the extinction of the megafauna?

Author: Sergio Bogan, Federico L Agnolin, Marcos Cenizo, Daniel Tassara, and Adrián Giacchino
Subjects: Medicine, Science
Abstract: This study contributes to the knowledge of continental fishes recovered from sedimentary successions corresponding to the Bonaerean Stage/Age (late mid-Pleistocene) in the locality of Centinela del Mar, General Alvarado County, Buenos Aires province, Argentina. At this site we describe fossil fishes from a palaeolagoon, including Corydoras sp., Pimelodella sp., Rhamdia sp., Oligosarcus sp., small undetermined characids, Jenynsia sp. and Odontesthes sp. The recovered ichthyofaunal assemblage comprises at least seven taxa of Paranaean lineage. The taxonomic composition of the palaeoichthyofauna is quite comparable to that presently found in Bonaerean Watercourses of the Atlantic Drainage ecoregion. This suggests that local ichthyofaunal communities have remained relatively stable since the late mid-Pleistocene.
Published: 2020
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7. An integrated approach clarifies the cryptic diversity in Hypostomus Lacépède 1803 from the Lower La Plata Basin

Author: YAMILA P. CARDOSO, FLORENCIA BRANCOLINI, LUCILA PROTOGINO, ARIEL PARACAMPO, SERGIO BOGAN, PAULA POSADAS, and JUAN I. MONTOYA-BURGOS
Subjects: Argentina, Brazil, freshwater fishes, molecular phylogenetics, Paraná Basin, Science
Abstract: 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. paranensis should be considered as species inquirenda and H. cordovae as valid species. This integrated approach provides key information for assessing the conservation status and biogeographic aspects of the genus Hypostomus in the Lower La Plata Basin.
Published: 2019
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8. Estudio de los restos arqueofaunísticos recuperados en el sitio Laguna del Telégrafo (costa norte de Santa Cruz)

Author: Miguel Ángel Zubimendi, Heidi Hammond, and Sergio Bogan
Subjects: restos óseos, restos malacológicos, conchero, costa norte de santa cruz, Archaeology, CC1-960
Abstract: En este trabajo se presentan los resultados de los análisis realizados sobre los restos arqueofaunísticos, tanto de vertebrados e invertebrados, recuperados en el sitio Laguna del Telégrafo, ubicado en la localidad arqueológica Cabo Blanco (costa norte de Santa Cruz, Patagonia argentina). Este sitio se encuentra emplazado en el borde de una antigua planicie de mareas que actualmente constituye una laguna temporaria. Se trata de un conchero de pequeñas dimensiones en el cual se excavaron 2 m2, y cuya antigüedad es de ca. 2300 años AP. Durante las tareas de excavación se identificó una lente de valvas en posición subsuperficial, en la cual se recuperaron gran cantidad de restos faunísticos (óseos y malacológicos), líticos y antracológicos, así como también un nudo de cuero. Se analiza y discute la posible funcionalidad del sitio y las características formacionales del depósito arqueológico.
Published: 2016
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9. Stranded humpback whale (Megaptera novaeangliae) (Cetacea: Balaenopteridae) in Paraná River Delta, Buenos Aires Province, Argentina. Comments on the occurrence of marine mammals in the La Plata River Basin

Author: Sergio O. Lucero, María Constanza Gariboldi, Valeria Bauni, Juan Manuel Meluso, Daniela del Castillo, Federico L. Agnolin, and Sergio Bogan
Subjects: Megaptera novaeangliae, Humpback whale, Delta del Río Paraná, Haplotypes, Argentina, Zoology, QL1-991
Abstract: Abstract The humpback whale (Megaptera novaeangliae) is distributed among most oceans and seas of the globe (except Mediterranean Sea). These whales migrate from feeding regions in the Antarctic waters to breeding areas in tropical and subtropical seas. Here we report the stranding of a female young humpback whale, which was founded dead in the vicinity of the Talavera Island, in the Paraná River Delta, Buenos Aires Province, Argentina. From the analysis of mitochondrial cytochrome c oxidase subunit I gene sequences, two novel haplotypes were found, totalizing four haplotypes described for the species. In the La Plata River Basin this species was found only twice at the end of the XIX century. Thus, the new finding constitutes an important addition to the list of cetaceans that occurs in Uruguay, Paraná and La Plata Rivers.
Published: 2018
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10. A contribution to the checklist of fishes of San Luis province, Argentina

Author: Yamila Cardoso, Sergio Bogan, Juan Meluso, Adrián Jáuregui, María Cabrera, and Marta Lizarralde
Subjects: Biology (General), QH301-705.5
Abstract: 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 watersheds with poor or absent previous records. Here, we cite Jenynsia multidentata from the Desaguadero and Bebedero rivers, Cnesterodon decemmaculatus for Chorrillos River, and Oligosarcus jenynsii for Luján, Quines and Quinto rivers. We add five taxa to the Nogolí River that have not been previously reported. We also present for the first time a list of the fish fauna from the Conlara, Luján and Quines basins. Our results provide 34 new records of freshwater fish distribution.
Published: 2015
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11. A continental-wide molecular approach unraveling mtDNA diversity and geographic distribution of the Neotropical genus Hoplias.

Author: Yamila P Cardoso, Juan J Rosso, Ezequiel Mabragaña, Mariano González-Castro, Matías Delpiani, Esteban Avigliano, Sergio Bogan, Raphael Covain, Nahuel F Schenone, and Juan M Díaz de Astarloa
Subjects: Medicine, Science
Abstract: 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 diversity within the valuable and widespread Neotropical genus Hoplias was assessed by means of DNA Barcoding. The geographic coverage spanned 40 degrees of latitude from French Guiana to Argentina. Our analyses revealed 22 mitochondrial lineages fully supported by means of Barcode Index Number, Automatic Barcode Gap Discovery and phylogenetic analyses. This mtDNA survey revealed the existence of 15 fully supported mitochondrial lineages within the once considered to be the continentally distributed H. malabaricus. Only four of them are currently described as valid species however, leaving 11 mitochondrial lineages currently "masked" within this species complex. Mean genetic divergence was 13.1%. Barcoding gap analysis discriminated 20 out of the 22 lineages tested. Phylogenetic analyses showed that all taxonomically recognized species form monophyletic groups. Hoplias malabaricus sensu stricto clustered within a large clade, excluding the representatives of the La Plata River Basin. In the H. lacerdae group, all species but H. curupira showed a cohesive match between taxonomic and molecular identification. Two different genetic lineages were recovered for H. aimara. Given the unexpected hidden mitochondrial diversity within H. malabaricus, the COI sequence composition of specimens from Suriname (the type locality), identified as H. malabaricus sensu stricto, is of major importance.
Published: 2018
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12. Primer registro de Synbranchiformes (Teleostei) para el Holoceno temprano de Argentina First record of Symbranchiformes (Teleostei) from the early Holocene of Argentina

Author: Sergio Bogan, Alfredo E Zurita, Ángel R Miño-Boilini, Paola Suárez, Juan Friedrichs, Alicia I Lutz, and José Friedrichs
Subjects: Synbranchidae, Synbranchus, Formación Río Bermejo, Pleistoceno-Holoceno, Río Bermejo Formation, Pleistocene-Holocene, Science, Science (General), Q1-390
Abstract: En este trabajo se presentan y describen los restos óseos de peces Synbranchidae cf. Synbranchus recuperados en los niveles fosilíferos de la Formación Río Bermejo de la localidad de Mansilla, sudeste de la provincia de Formosa, Argentina. Estos materiales constituyen los únicos restos de peces recuperados en dicha localidad y fueron hallados asociados a mamíferos fósiles característicos de finales del Pleistoceno y comienzos del Holoceno. Hasta el presente solo se conocen escasos restos fósiles de sinbránquidos en América del Sur. Los restos más antiguos corresponden a la parte más baja del Pleistoceno Superior ("Belgranense") de la región Pampeana de Buenos Aires. Los materiales de la Formación Río Bermejo representan el primer registro fósil conocido de un Synbranchidae cf. Synbranchus para el Holoceno temprano.In this contribution we present and describe the remains of the bony fish cf. Synbranchus, exhumed from fossiliferous levels of the Río Bermejo Formation, Mansilla, southeastern Formosa province, Argentina. These materials constitute the only fish remains exhumed in this area, and they were found in association with extinct mammals which are characteristic of the Late Pleistocene and Early Holocene. Until now, only few fossil remains of Synbranchidae were known in South America. The earliest records come from the lowermost section of the Upper Pleistocene ("Belgranense") from the Pampean region, Buenos Aires, Argentina. The materials coming from the Rio Bermejo Formation represent the first fossil record of a Synbranchidae cf. Synbranchus from the Early Holocene.
Published: 2012

13. Registro de Moridae (Teleostei: Gadiformes) en la Formación Chenque (Oligoceno Tardío-Mioceno Temprano) de la provincia de Chubut, Argentina Record of Moridae (Teleostei: Gadiformes) from the Chenque Formation (Late Oligocene - Early Miocene) from the Chubut province, Argentina

Author: Sergio Bogan and Federico L Agnolin
Subjects: Gadiformes, Moridae, Formación Chenque, Chubut, Argentina, Patagonia, Chenque Formation, Science, Science (General), Q1-390
Abstract: En el presente trabajo se describen restos de un especimen relativamente completo perteneciente a la familia Moridae. Dicho ejemplar ha sido colectado en sedimentos referibles a la Formación Chenque (Oligoceno-Mioceno) de la provincia de Chubut, Argentina. Este material constituye el primer registro fósil concreto de un Gadiformes para Argentina y los primeros materiales óseos fósiles registrados para Moridae. La morfología de los ejemplares sugiere afinidades con los géneros Physiculus y Salilota. La presencia de Moridae en el Mioceno Temprano de Patagonia y Nueva Zelanda se encuentra de acuerdo con hipótesis previas que indican conexiones marítimas transantárticas entre ambas regiones geográficas durante el Oligoceno Tardío - Mioceno Temprano.A nearly complete specimen belonging to the family Moridae is described in this paper. The material has been collected in outcrops referable to the Chenque Formation (Oligocene-Miocene) from the Chubut province, Argentina. The specimen constitutes the first fossil record for the Gadiformes in Argentina and one of the first osteological occurrences for Moridae. The morphology of the specimen suggests affinities with the genera Physiculus and Salilota. The presence of Moridae in the Early Miocene of Patagonia and New Zealand is in agreement with previous hypotheses suggesting marine transantarctic connections between both landmasses during Late Oligocene - Early Miocene times.
Published: 2011

14. Descripción de una nueva especie de bagre marino fósil (Teleostei, Siluriformes, Ariidae) del Mioceno de la provincia de Río Negro, Argentina

Author: Sergio Bogan and Federico L. Agnolin
Subjects: Siluriformes, Ariidae, Genidens, Formación Gran Bajo del Gualicho, Patagonia, Zoology, QL1-991
Abstract: En este trabajo se describen dos cráneos de la familia Ariidae procedentes del miembro Saladar de la Formación Gran Bajo del Gualicho, ubicados en las Salinas del Gualicho, provincia de Río Negro, Argentina. La edad de los depósitos del Miembro Saladar se remonta al Mioceno Temprano alto/Mioceno Medio bajo. Los materiales son asignados a una nueva especie extinta del género viviente Genidens. Este nuevo taxón se distingue de todas las especies actuales por presentar un proceso supraoccipital muy corto, ancho y redondeado, extraescapular subcircular y mesetmoides amplios con una conspicua escotadura mesial, frontales prácticamente planos en vista lateral y margen lateral de los huesos esfenóticos rectilíneo. Genidens sp. nov., representa el registro más antiguo para el género y constituiría una especie de aspecto similar a las formas actuales del género. sp. nov., representa el registro más antiguo para el género y constituiría una especie de aspecto similar a las formas actuales del género.
Published: 2011
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15. Primera ictiofauna marina del Cretácico Superior (Formación Jaguel, Maastrichtiano) de la provincia de Río Negro, Argentina First marine ichthyofauna from the Upper Cretaceous (Jaguel Formation; Maastrichtian) from Río Negro province, Argentina

Author: Sergio Bogan and Federico L. Agnolin
Subjects: Maastrichtiano, Serratolamna serrata, Lamniformes, Squalicorax, Enchodus, Maastrichtian, Zoology, QL1-991
Abstract: Se describe un conjunto de dientes fósiles que proceden de sedimentos marinos de la Formación Jagüel (Maastrichtiano), de la localidad de Bajo Trapalcó, provincia de Río Negro, Patagonia, Argentina. La ictiofauna aquí descripta es la primera para la Formación y se compone de unos seis taxones diferentes de Chondrichthyes (Serratolamna serrata, Squalicorax pristodontus, Cretalamna appendiculata, Carcharias sp., Odontaspis sp. y cf. Pseudohypolophus mcnultyi) y dos Teleostei del género Enchodus (aff. E. ferox y aff. E. gladiolus). Serratolamna serrata es el taxón mejor representado del conjunto, y constituye la cita más austral conocida en la distribución de esta especie y el primer registro fósil para Argentina. Los registros de Enchodus, Squalicorax pristodontus y cf. Pseudohypolophus mcnultyi, representan las primeras descripciones de estos taxones para Argentina. Todos los taxones descriptos constituyen un ensamblaje de especies que caracterizan las paleoictiofaunas de los mares del Cretácico Superior de distintas partes del globo, aportando novedosa información para la comprensión de las ictiofaunas Mesozoicas del cono sur sudamericano.This paper describes several fossil teeth coming from marine sediments from the Bajo Trapalcó locality, Río Negro province, Patagonia, Argentina. The ichthyofauna described here is composed by six different chondrichtyan taxa (Serratolamna serrata, Squalicorax pristodontus, Cretalamna appendiculata, Carcharias sp., Odontaspis sp. and cf. Pseudohypolophus mcnultyi) and two Teleostei of the genus Enchodus (aff. E. ferox and aff. E. gladiolus). Serratolamna serrata is the most abundant species, and it represents the southernmost record for the species and the first record for Argentina. The records of Enchodus, Squalicorax pristodontus and cf. Pseudohypolophus mcnultyi, constitute the first mention for these taxa in Argentina. The taxa described here characterize the paleoichthyofaunas of the Upper Cretaceous seas from different regions of the world, contributing with new information toward the comprehension of the Mesozoic ichthyofunas from the southern regions of South America.
Published: 2010
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16. Primer registro fósil de la familia Trichomycteridae (Teleostei: Siluriformes; Plioceno) en la Formación Monte Hermoso, Argentina First fossil record for the family Trichomycteridae (Teleostei: Siluriformes; Pliocene) in the Monte Hermoso Formation, Argentina

Author: Sergio Bogan and Federico L. Agnolin
Subjects: Siluriformes, Trichomycteridae, Plioceno, Formación Monte Hermoso, Buenos Aires, Argentina, Pliocene, Monte Hermoso Formation, Science, Science (General), Q1-390
Abstract: En la presente nota se describen materiales asignables a la familia de Siluriformes Trichomycteridae, los cuales exhiben una serie de caracteres osteológicos que permiten referirlos a la subfamilia Trichomycterinae. Estos elementos consisten en un opercular e interopercular pertenecientes a un mismo individuo, procedentes del Plioceno Inferior-Medio de la Formación Monte Hermoso en la localidad de Farola de Monte Hermoso, provincia de Buenos Aires, Argentina. Este registro constituye el primer fósil reportado para la familia y unos de los pocos restos paleoictiológicos citados para la Formación Monte Hermoso.Some fossil remains referable to the siluriform family Trichomycteridae are described in this paper. These specimens exhibit a combination of characters that allow to include them within the subfamily Trichomycterinae. These elements consist on an opercular and interopercular of the same individual, collected in Lower-Middle Pliocene beds of the Monte Hermoso Formation, at the Farola de Monte Hermoso locality, Buenos Aires province, Argentina. This record constitutes the first fossil remains reported for the family, and one of the few paleoichthyological records for the Monte Hermoso Formation.
Published: 2009

17. Primeros registros fósiles de pejerreyes (Teleostei: Atheriniformes) en el Pleistoceno Medio de la provincia de Buenos Aires, Argentina First fossil records of silversides (Teleostei: Atheriniformes) from the Middle Pleistocene of Buenos Aires province, Argentina

Author: Sergio Bogan, Martín L. de los Reyes, and Marcos M. Cenizo
Subjects: Pejerreyes, Atherinomorpha, Sorgentinini, Odontesthes, Pleistoceno, Centinela del Mar, Argentina, Silversides, Pleistocene, Science, Science (General), Q1-390
Abstract: En este trabajo se dan a conocer restos fósiles de pejerreyes recuperados en secuencias sedimentarias correspondientes al Piso-Edad Bonaerense (Pleistoceno Medio) de la localidad de Centinela del Mar, provincia de Buenos Aires, Argentina. Los únicos registros fósiles previos de pejerreyes sudamericanos se restringen a tres localidades de edad Miocena de Argentina y Chile. La presencia de diversos caracteres osteológicos diagnósticos permitió referir al género Odontesthes algunas de las estructuras óseas aquí tratadas. Estos registros brindan nuevos datos acerca de la composición de las ictiofaunas pleistocénicas de Argentina, constituyendo los primeros restos fósiles de pejerreyes procedentes de la región pampeana.This paper presents the fossil remains of silversides recovered in sedimentary sequences corresponding to Centinela del Mar district Bonaerian Stage-Age (Middle Pleistocene), Buenos Aires province, Argentina. The few only previously described fossil silversides are restricted to three Chilean and Argentinean Miocene localities. The silversides studied here present several diagnostic osteological characters that allow us to refer the remains to the genus Odontesthes. These records give us new data on the composition of the pleistocenic ictiofaunas of Argentina, besides representing the first fossil records of silversides from the Pampean region.
Published: 2009

18. Primer registro del género Jenynsia Günther, 1866 (Teleostei: Cyprinodontiformes) en el Pleistoceno Medio tardío de la provincia de Buenos Aires (Argentina)

Author: Sergio Bogan, Martín L. de los Reyes, and Marcos M. Cenizo
Subjects: Anablepidae, Jenynsia, Bonaerense, Pleistoceno Medio tardío, Centinela del Mar, Bonaerian, Late Middle Pleistocene, Zoology, QL1-991
Abstract: En este trabajo se da a conocer un premaxilar izquierdo referible al género Jenynsia recuperado en facies lacustres correspondientes al Piso-Edad Bonaerense (Pleistoceno Medio tardío) de la localidad de Centinela del Mar, provincia de Buenos Aires, Argentina. Dicho material constituye el primer registro fósil para este género y uno de los escasos antecedentes para la familia Anablepidae. El hallazgo aquí comunicado brinda nuevas evidencias para la comprensión de las ictiofaunas cuaternarias de América del Sur.In this article, we described a left premaxilla assigned to Jenynsia, recovered in lacustrine facies corresponding to the Bonaerian Stage-Age (Late Middle Pleistocene) from Centinela del Mar, Buenos Aires Province, Argentina. This material constitutes the first fossil record of the genus and one among the few antecedents of the Anablepidae family. The finding communicated here offers new evidence towards the understanding of the Quaternary South American ichthyofaunas.
Published: 2009
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19. IMPLICACIONES PALEOAMBIENTALES DE LA PRESENCIA DEL GÉNERO CERATOPHRYS (ANURA, CERATOPHRYINAE) EN CONTEXTOS ARQUEOLÓGICOS DE LA TRANSICIÓN PAMPEANO-PATAGÓNICA EN EL HOLOCENO TARDÍO (CURSO INFERIOR DEL RÍO COLORADO, ARGENTINA) PALEOEVIRONMENTAL IMPLICATIONS OF THE CERATOPHRYS GENUS (ANURA, CERATOPHRYINAE) FROM ARCHAEOLOGICAL CONTEXTS OF THE PAMPEAN-PATAGONIAN TRANSITION DURING THE LATE HOLOCENE (LOWER BASIN OF THE COLORADO RIVER, ARGENTINA)

Author: LUCIANA STOESSEL, SERGIO BOGAN, GUSTAVO MARTÍNEZ, and FEDERICO L AGNOLIN
Subjects: Argentina, curso inferior del río Colorado, transición Pampeano-Patagónica, Ceratophrys, Holoceno Tardío, Argentine, lower valley of Colorado River, Pampean-Patagonian transition, Late Holocene, History of scholarship and learning. The humanities, AZ20-999, Anthropology, GN1-890, Social sciences (General), H1-99
Abstract: En el presente trabajo se reporta la presencia del género Ceratophrys en la localidad arqueológica San Antonio y en el sitio Paso Alsina 1, ubicados en el curso inferior del río Colorado (provincia de Buenos Aires, Argentina). Los materiales comunicados aquí son asignados al Holoceno Tardío final y representan el registro más meridional conocido para el género, encontrándose en un área de transición Pampeano-Patagónica, a más de 400 kilómetros hacia el sur de su distribución actual. Se mencionan y discuten todas las localidades holocénicas portadoras de elementos óseos referibles a Ceratophrys. La variación corológica de esta especie aquí informada es coincidente con hipótesis paleoambientales que proponen mayores índices de temperatura y posiblemente una mayor disponibilidad hídrica para el Holoceno tardío.In this work, we report the presence of the Ceratophrys genus at the archaeological locality of San Antonio and at the Paso Alsina 1 archaeological site, situated at the lower basin of the Colorado river (Buenos Aires province, Argentina). The materials communicated here are assigned to the late Holocene and represent the southernmost evidence known for the genus at the Pampean-Patagonian transition, recorded more than 400 kilometers south of their present-day distribution. Additionally, we mention and discuss all the holocene localities where osseous elements referable to Ceratophrys were found. The corological variation proposed here for the genus Ceratophrys is coincident with paleoenvi-ronmental hypotheses that propose higher temperature and a possible elevated hydric availability rates for the late Holocene.
Published: 2008

20. Lestodelphys halli EN LA PROVINCIA DE SANTA CRUZ (ARGENTINA): PRIMER HALLAZGO EN UN SITIO ARQUEOLÓGICO EN LA COSTA PATAGÓNICA Lestodelphys halli IN THE PROVINCE OF SANTA CRUZ (ARGENTINA): FIRST FINDING IN AN ARCHAEOLOGICAL SITE IN COAST PATAGÓNICA

Author: MIGUEL A ZUBIMENDI and SERGIO BOGAN
Subjects: Lestodelphys halli, distribución, Punta Medanosa, distribution, History of scholarship and learning. The humanities, AZ20-999, Anthropology, GN1-890, Social sciences (General), H1-99
Abstract: En esta nota nos proponemos tres objetivos. Primero, dar a conocer la presencia de Lestodelphys halli (Thomas 1921) en un sitio de la localidad arqueológica de Punta Medanosa, Provincia de Santa Cruz (Argentina). Segundo, realizar una breve caracterización de la especie, así como una descripción de los rasgos osteológicos de interés para su determinación en otros contextos arqueológicos. Tercero, realizar un repaso bibliográﬁco de sitios en los cuales se ha registrado la presencia de L. halli en la Republica ArgentinaIn this paper we have proposed three main objectives: ﬁrst, to inform the presence of Lestodelphys halli (Thomas 1921) in a site in the archaeological locality of Punta Medanosa, Santa Cruz province (Argentina). Second, to make a brief characterization of the biology, distribution, etc. of this taxon, and a description of osteological characters of interest for archaeological context. Third, to make a systematic description of the presence of L. halli in archaeological sites in the Argentine Republic, with an emphasis on the kind of information given in each case
Published: 2006

21. Arrhinolemur scalabrinii Ameghino, 1898, of the late Miocene : a taxonomic journey from the Mammalia to the Anostomidae (Ostariophysi: Characiformes)

Author: Sergio Bogan, Brian Sidlauskas, Richard P Vari, and Federico Agnolin
Subjects: Argentina, fossil, Leporinus, Osteology, Phylogeny, Zoology, QL1-991
Abstract: The fossil species Arrhinolemur scalabrinii, which was described from late Miocene deposits of Entre Ríos, Argentina, is reevaluated. Whereas the species was originally placed in the Primates (Mammalia) and later made the unique member of the order Arrhinolemuroidea within the Mammalia, our analysis indicates that the specimen is rather a fish of the genus Leporinus, family Anostomidae (Characiformes). The species is redescribed, and the characters that support its new generic assignment are discussed.
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22. The fossil record of chimaeras (Chondrichthyes, Holocephali) in Argentina

Author: Sergio Bogan and Federico L. Agnolín
Subjects: General Agricultural and Biological Sciences
Published: 2022
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23. The first fossil from the superdiverse clade Loricariinae (Siluriformes, Loricariidae): a new species of the Armored Catfish from the late Miocene of Paraná, Argentina

Author: Sergio Bogan and Federico L. Agnolin
Subjects: Paleontology
Published: 2022
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24. First occurrence of the giant shark Carcharocles megalodon (Agassiz, 1843) (Lamniformes; Otodontidae) at Buenos Aires Province, Argentina

Author: Julieta J. De Pasqua, Alexis Mauro Aranciaga Rolando, Federico L. Agnolin, Diego Gambetta, and Sergio Bogan
Subjects: MACROPREDATORY SHARK, biology, Megalodon, Paleontology, MAR DE AJÓ, CARCHAROCLES MEGALODON, biology.organism_classification, Archaeology, purl.org/becyt/ford/1 [https], Otodontidae, purl.org/becyt/ford/1.5 [https], Geography, Lamniformes, FOSSIL TEETH
Abstract: – Carcharocles megalodon is considered a macropredatory shark that inhabited the seas around the world from middle Miocene to late Pliocene. In Argentina, it has only been formally recorded at two localities. Here, we report the first record for this taxon in the Buenos Aires Province. This occurrence is based on an isolated tooth recovered on the beach at the Punta Médanos locality, which lacks clear stratigraphic context. Based on the regional geology, the specimen probably came from Pliocene beds. Its size indicates that it probably belongs to a juvenile individual. Carcharocles megalodon é considerado um tubarão macropredador que habitou os mares ao redor do mundo desde o Mesomioceno até o Neoplioceno. Na Argentina, a espécie só foi formalmente registrada em duas localidades. Aqui, relatamos o primeiro registro desse táxon na Província de Buenos Aires. Essa ocorrência é baseada em um dente isolado recuperado na praia da localidade de Punta Médanos, que carece de contexto estratigráfico claro. Com base na geologia da região, o espécime provavelmente veio de camadas do Plioceno. Seu tamanho indica que provavelmente pertence a um indivíduo jovem. Fil: De Pasqua, Julieta. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Agnolin, Federico. Universidad Maimónides; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Fundación de Historia Natural Félix de Azara; Argentina Fil: Aranciaga Rolando, Alexis Mauro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Bogan, Sergio. Universidad Maimónides; Argentina. Fundación de Historia Natural Félix de Azara; Argentina Fil: Gambetta, Diego. Museo Mar de Ajó; Argentina
Published: 2021
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25. First record of the ichthyodectiform fishXiphactinus(Teleostei) from Patagonia, Argentina

Author: Federico L. Agnolin, Julieta J. De Pasqua, and Sergio Bogan
Subjects: musculoskeletal diseases, 010506 paleontology, Teleostei, biology, Paleontology, Zoology, biology.organism_classification, 01 natural sciences, Gondwana, stomatognathic system, Genus, %22">Fish , Ecology, Evolution, Behavior and Systematics, Xiphactinus, 0105 earth and related environmental sciences
Abstract: We report the first record of the genus Xiphactinus from southern South America. The recovered fossil material consists of an associated maxilla and abdominal vertebra, probably derived from latest...
Published: 2020
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26. An integrative approach method reveals the presence of a previously unreported species of Imparfinis Eigenmann and Norris 1900 (Siluriformes: Heptapteridae) in Argentina

Author: Gastón Aguilera, Guillermo E. Terán, Juan Marcos Mirande, Felipe Alonso, Guido Miranda Chumacero, Yamila Cardoso, Sergio Bogan, and Dario R. Faustino‐Fuster
Subjects: Rivers, Peru, Argentina, Animals, Aquatic Science, Ecology, Evolution, Behavior and Systematics, Catfishes, Phylogeny
Abstract: Specimens of Imparfinis were recently collected in north-western 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 to determine the species identity of these specimens. A principal components analysis of morphological data clustered the specimens from north-western Argentina and from the Amazon basin, indicating a close morphological resemblance. Also, a molecular phylogenetic analysis showed populations of I. guttatus from Argentina and Peru forming a clade. According to the conducted haplotype network analysis these populations are distinct in two mutations. Thus, in the absence of morphological or molecular data indicating the contrary, the combined method supports the identity of the specimens from the tributaries of the Paraguay River in Argentina as I. guttatus, whose type locality is in the upper Beni River basin in Bolivia. This contribution is also the first record for this species from Argentina. The disjunct distribution of I. guttatus provides new evidence reinforcing the hypothesis for the origin of the Paraguayan ichthyofauna. We also provide an approach to the phylogenetic relationships of Imparfinis in Heptapteridae.
Published: 2022

27. The fossil record of the Bramble-shark Echinorhinus (Echinorhiniformes, Echinorhinidae) in South America

Author: Sergio Bogan and Federico L. Agnolín
Subjects: Geology, Earth-Surface Processes
Published: 2022
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28. Molecular and morphological evidence revalidates

Author: Yanina F, Briñoccoli, Sergio, Bogan, Dahiana, Arcila, Juan J, Rosso, Ezequiel, Mabragaña, Sergio M, Delpiani, Juan Martín Díaz, de Astarloa, and Yamila P, Cardoso
Abstract: We conducted a revision of the Neotropical genus
Published: 2021

29. Registre fossile de Characiformes dans la Formation de Monte Hermoso (Pliocène inferieur), Buenos Aires, Argentine. Implications paléobiogéographiques

Author: Juan Marcos Mirande, Federico L. Agnolin, and Sergio Bogan
Subjects: Fossil Record, Pliocene, Characidae, BRAZILIAN ICHTHYOFAUNA, Paleontology, FAROLA DE MONTE HERMOSO, purl.org/becyt/ford/1 [https], purl.org/becyt/ford/1.5 [https], Geography, PLIOCENE, CHARACIDAE, Farola de Monte Hermoso, Brazilian Ichthyofauna
Abstract: The fossil record of fishes from the Farola de Monte Hermoso locality (lower Pliocene) in the southern Buenos Aires province, Argentina, shows an unusual composition. The locality at the southern boundary of the Brazilian Ichthyogeographic Realm. However, its fossil record is composed of fossil fishes that are not necessarily related to Brazilian lineages, namely indeterminate siluriforms, trichomycterid catfishes, and percomorphaceans. The aim of the present contribution is to describe and report for the first time isolated specimens belonging to Characidae fishes. In the Pampean region the fossil record of characids is restricted to Oligosarcus Günther, 1864 sp. from the late-middle Pleistocene. The present finding fills a temporal gap between the Paleogene and Quaternary reports and indicates that Brazilian fish lineages were present in the area by early Pliocene times, and may constitute an indirect evidence of the evolution of the basins in the southern Pampean Area. Le registre fossile de poissons de la localité de Farola de Monte Hermoso (Pliocène inférieur) dans la province méridionale de Buenos Aires, Argentine, est encore biaisé. Il est situé à la limite méri- dionale du domaine ichthyogéographique brésilien. Cependant, son registre fossile est composé de poissons fossiles qui ne sont pas nécessairement reliés aux lignées brésiliennes, en particulier siluri- formes indéterminés, poissons-chats trichomyctéridés et percomorphacéens. Le but de la présente contribution est de décrire et mentionner des spécimens isolés appartenant aux poissons Characidés. Dans la région de la Pampa, le registre fossile des Characidés est restreint à Oligosarcus Günther, 1864 sp. du Pléistocène moyen tardif. Les présentes découvertes comblent un vide temporel entre les registres au Paléogène et au Quaternaire et indiquent que des lignées de poissons brésiliens étaient présents dans la zone au Pliocène inférieur et peuvent constituer une preuve indirecte de l’évolution des bassins dans le domaine méridional de la Pampa. Fil: Bogan, Sergio. Fundación de Historia Natural Félix de Azara; Argentina Fil: Agnolin, Federico. Fundación de Historia Natural Félix de Azara; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Mirande, Juan Marcos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina. Fundación Miguel Lillo; Argentina
Published: 2021

30. Molecular and taxonomic evidence unmask hidden species diversity in the genus Acrobrycon (Characiformes, Characidae)

Author: Yamila Paula Cardoso, Ezequiel Mabragaña, Juan José Rosso, Sergio Bogan, Yanina F. Briñoccoli, Sergio Matias Delpiani, Dahiana Arcila, and Juan Diaz de Astarloa
Subjects: Mitochondrial DNA, biology, Species diversity, Acrobrycon, mitochondrial DNA, Characiformes, Freshwater fishes, biology.organism_classification, Characidae, Evolutionary biology, Genus, La Plata River Basin, Endorheic, Stevardiinae
Abstract: 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 collecting additional morphometric, meristic, and genetic data (COI mitochondrial gene) for 24 individuals distributed along La Plata River Basin in Argentina, and discussed our results in the context of multiple biogeographic process of isolation in this basin. Our results revealed a more complex history of diversification and geographic distribution across Acrobrycon species than previously suspected. We present new evidence that leads us to reconsider the validity of A. tarijae, which is distinguished from A. ipanquianus by the number of vertebrae (37-39 vs. 41-42), pleural ribs (12-13 vs 14), and unbranched anal-fin rays (v-vi vs. ii-iii). These results were supported by molecular analysis which showed a genetic divergence >4% between both nominal species, also, indicated two major genetic clusters of A. tarijae: the first group consisted of specimens from the Bermejo, Pilcomayo, Itiyuro and Juramento River Basins (northern Argentina), and the second group is composed by specimens from the southernmost basins, such as the Salí River in Tucumán and the Quinto River in the province of San Luis. These results suggest that the genetic structure may be a consequence of the geographical distance that separates the two groups and the type of drainage.
Published: 2021
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31. Processes that drive the population structuring of Jenynsia lineata (Cyprinidontiformes, Anablepidae) in the La Plata Basin

Author: Ariel Hernán Paracampo, Yamila Paula Cardoso, Paula Posadas, Gustavo M. Somoza, Luiz Jardim de Queiroz, Yanina F. Briñoccoli, Sergio Bogan, and Juan I. Montoya-Burgos
Subjects: 0106 biological sciences, Anablepidae, Range (biology), Species distribution, Population, Intraspecific variation, 010603 evolutionary biology, 01 natural sciences, COI, 03 medical and health sciences, Genetic variation, genetic structure, Basin fragmentation, education, Ecology, Evolution, Behavior and Systematics, QH540-549.5, Original Research, 030304 developmental biology, Nature and Landscape Conservation, Isolation by distance, 0303 health sciences, Genetic diversity, education.field_of_study, Ecology, biology, Isolatiion, Reproductive isolation, Ecología, biology.organism_classification, intraspecific variation, Habitat, Genetic structure, Freshwater fish, basin fragmentation, isolation
Abstract: 1. 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. 2. Jenynsia lineata is a small viviparous fish that inhabits a wide range of habitats in South America. To decipher the isolation processes that drive population structuring in J. lineata, we analyzed 221 sequences of the mitochondrial cytochrome c oxidase I gene (COI), from 19 localities. Then, we examined the influence of the three most common types of isolation in order to explain the genetic variation found in this species. 3. Our results revealed a marked structuration, with three groups: (a) La Plata/ Desaguadero Rivers (sampling sites across Argentina, Uruguay, and Southern Brazil), (b) Central Argentina, and (c) Northern Argentina. A distance-based redundancy analysis, including the explanatory variables geographical distances, altitude, latitude, and basin, was able to explain up to 65% of the genetic structure. A variance partitioning analysis showed that the two most important variables underlying the structuration in J. lineata were altitude (isolation by environment) and type of basin (isolation by barrier). 4. Our results show that in this species, the processes of population diversification are complex and are not limited to a single mechanism. The processes that play a prominent role in this study could explain the high rate of diversity that characterizes freshwater fish species. And these processes in turn are the basis for possible speciation events., Instituto de Limnología "Dr. Raúl A. Ringuelet", Laboratorio de Sistemática y Biología Evolutiva
Published: 2020
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32. First fossil of the Giant Armored Catfish Acanthicus (Siluriformes, Loricariidae) from the Late Miocene of Entre Ríos Province, Argentina

Author: Federico L. Agnolin and Sergio Bogan
Subjects: 0106 biological sciences, Loricariidae, Argentina, 010607 zoology, Late Miocene, Structural basin, Neogene, 010603 evolutionary biology, 01 natural sciences, Genus, Animals, Animalia, Chordata, Catfishes, Phylogeny, Ecology, Evolution, Behavior and Systematics, Taxonomy, biology, Actinopterygii, Fossils, Amazon rainforest, Acanthicus, Ecology, Biodiversity, biology.organism_classification, Brachyplatystoma, Animal Science and Zoology, Siluriformes
Abstract: Loricariidae is a very diverse lineage of Neotropical fishes, being the most speciose family of the order Siluriformes. However, the loricariid fossil record is still very sparse. The aim of the present contribution is to describe in detail several bones belonging to the loricariid genus Acanthicus coming from late Miocene beds located at the Paraná River cliffs, Entre Ríos province, Argentina. Fishes of the Acanthicus clade are currently restricted to the northern half of South America, being mainly distributed in the Orinoco and Amazonas basins, with a single genus reaching the Paraná-Plata basin. Acanthicus adds to the list of several taxa that are shared by the Miocene of Paraná, Amazonas and Orinoco basins, but that nowadays are absent in the former (e.g., Colossoma, Phractocephalus, and Brachyplatystoma), and are typical of large river channels. This report of Acanthicus supports a close affinity between freshwater faunas of the Paraná, Orinoco, and Amazonas basins. Miocene fossils of freshwater fishes recorded in Paraná beds shed light on the connections between ancient basins of South America and also indicate that several fish clades suffered regional extinctions during the late Neogene or the beginning of the Quaternary.
Published: 2020

33. First inventory of vertebrates in the private natural reserve El Morejon, Campana, Buenos Aires province

Author: Valeria Bauni, Juan Manuel Meluso, Marina Homberg, Adrián Giacchino, and Sergio Bogan
Subjects: Nature reserve, Geography, Paleontology, Animal Science and Zoology, Forestry, Ecology, Evolution, Behavior and Systematics
Published: 2019
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34. New genus and species of Anablepidae (Teleostei, Cyprinodontiformes) from the Late Miocene of Argentina

Author: Victor Hugo Contreras, Rodrigo Leandro Tomassini, Sergio Bogan, Federico L. Agnolin, and Silvio Heriberto Peralta
Subjects: 0106 biological sciences, Anablepidae, PHYLOGENY, ANABLEPID, Zoology, Late Miocene, 010603 evolutionary biology, 01 natural sciences, Paleontología, Ciencias de la Tierra y relacionadas con el Medio Ambiente, Monophyly, Genus, Cyprinodontiformes, Clade, Earth-Surface Processes, SANJUANABLEPS CALINGASTA, ARGENTINA, Teleostei, biology, 010604 marine biology & hydrobiology, Geology, biology.organism_classification, Sister group, CIENCIAS NATURALES Y EXACTAS, MIOCENE
Abstract: A new anablepid (Cyprinodontiformes) from the Late Miocene of Puchuzum locality, San Juan Province, Argentina is described here. The collected specimens include male and female individuals showing marked sexual dimorphism and represented different ontogenetic stages. The fossils show a unique combination of characters reveals a new genus and species, Sanjuanableps calingasta. The phylogenetic analysis allowed to identify a monophyletic clade including Anableps, Tucmanableps and Sanjuanableps, which constitutes the sister group of other anablepids. During the Late Miocene, Sanjuanableps possibly formed monospecific shoals in shallow ponds of salty water in semiarid environments. Fil: Bogan, Sergio. Universidad Maimónides. Departamento de Ciencias naturales y Antropología. Fundación de Historia Natural "Félix de Azara"; Argentina Fil: Contreras, Victor Hugo. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina Fil: Agnolin, Federico. Fundación de Historia Natural Félix de Azara; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina Fil: Tomassini, Rodrigo Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina Fil: Peralta, Silvio Heriberto. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Published: 2018
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35. Distribution extension of Hypostomus uruguayensis (Siluriformes: Loricariidae) in Argentina and first record for Bolivia. Molecular, morphology and biogeography data

Author: Sergio Bogan, Silvia Yasmin Lustosa-Costa, Luiz Jardim De Queiroz, Ariel Hernán Paracampo, Yamila Paula Cardoso, Juan I. Montoya-Burgos, and Tomás Maiztegui
Subjects: Bolivia, biology, Distribution (number theory), Biogeography, Loricariidae, Argentina, Zoology, Morphology (biology), Biodiversity, biology.organism_classification, Rivers, Animals, Animal Science and Zoology, Hypostomus, Catfishes, Ecology, Evolution, Behavior and Systematics, Taxonomy
Abstract: Lustosa-Costa, Silvia Yasmin, Bogan, Sergio, Queiroz, Luiz Jardim De, Montoya- Burgos, Juan I., Paracampo, Ariel, Maiztegui, Tomas, Cardoso, Yamila P. (2021): Distribution extension of Hypostomus uruguayensis (Siluriformes: Loricariidae) in Argentina and first record for Bolivia. Molecular, morphology and biogeography data. Zootaxa 4996 (1): 194-198, DOI: https://doi.org/10.11646/zootaxa.4996.1.12
Published: 2021
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36. Update of the distribution of Rhamdella aymarae (Siluriformes: Heptapteridae)

Author: Juan Manuel Meluso, Yanina F. Briñoccoli, Yamila Paula Cardoso, and Sergio Bogan
Subjects: 0301 basic medicine, 03 medical and health sciences, 030104 developmental biology, Paleontology, Animal Science and Zoology, Ecology, Evolution, Behavior and Systematics
Abstract: El genero Rhamdella esta incluido en la familia Heptapteridae e integrado por seis especies distribuidas en Argentina, Brasil y Bolivia. Rhamdella aymarae fue descripta originalmente para la cuenca arreica del rio Itiyuro, en el norte de Salta, Argentina. Segun una propuesta filogenetica basada en caracteres morfologicos R. aymarae y R. rusbyi son el grupo hermano de las especies restantes de este genero. En este articulo citamos por primera vez la presencia de Rhamdella aymarae para la cuenca del rio Pilcomayo y extendemos su distribucion a la provincia de Santiago del Estero. Realizamos tambien una reconstruccion filogenetica basada en el marcador mitocondrial COI, la cual permitio corroborar la asignacion taxonomica de los ejemplares estudiados y demostro que el genero Rhamdella no es un grupo monofiletico. Esta contribucion muestra evidencia de que las relaciones entre los generos de la familia Heptapteridae requieren de estudios mas detallados para definir su clasificacion.
Published: 2018
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37. A new species of the genus Echinorhinus (Chondrichthyes, Echinorhiniformes) from the upper cretaceous of southern South America (Argentina-Chile)

Author: Federico L. Agnolin, Fernando E. Novas, Rodrigo A. Otero, Federico Brissón Egli, Sergio Bogan, Mario E. Suárez, and Sergio Soto-Acuña
Subjects: ARGENTINA, 010506 paleontology, biology, Echinorhinus, CRETACEOUS, Paleontology, ECHINORHINUS, 010502 geochemistry & geophysics, biology.organism_classification, 01 natural sciences, Chondrichthyes, Pacific ocean, Cretaceous, Ciencias de la Tierra y relacionadas con el Medio Ambiente, Taxon, Oceanography, CHILE, Genus, Echinorhiniformes, Mesozoic, Meteorología y Ciencias Atmosféricas, CIENCIAS NATURALES Y EXACTAS, Geology, 0105 earth and related environmental sciences
Abstract: We describe isolated shark teeth collected from levels of the Calafate Formation at the SE coast of the Argentino Lake, Calafate city, Santa Cruz province, Argentina (Atlantic Ocean), and from the Algarrobo coast at the Valparaíso Region in central Chile (Pacific Ocean). The teeth belong to a new species of the echinorhiniform genus Echinorhinus. Echinorhinus maremagnum n. sp. was a taxon distributed in both the southwestern Atlantic and the southeastern Pacific. This new taxon constitutes the oldest record of echinorhiniforms from South America and one of the few Mesozoic records at a worldwide scale. Fil: Bogan, Sergio. Fundación de Historia Natural Félix de Azara; Argentina. Universidad Maimónides; Argentina Fil: Agnolin, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina. Fundación de Historia Natural Félix de Azara; Argentina. Universidad Maimónides; Argentina Fil: Otero, Rodrigo A.. Universidad de Chile; Chile Fil: Brissón Egli, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina Fil: Suárez, Mario E.. Universidad de Chile; Chile Fil: Soto Acuña, Sergio. Universidad de Chile; Chile Fil: Novas, Fernando Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina
Published: 2017
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38. Risks associated with introduction of poeciliids for control of mosquito larvae: first record of the non-nativeGambusia holbrookiin Argentina

Author: Yamila Paula Cardoso, Sergio Bogan, Paula Posadas, Juan I. Montoya-Burgos, M. B. Cabrera, and Gustavo M. Somoza
Subjects: 0106 biological sciences, Species complex, biology, Ecology, 010604 marine biology & hydrobiology, Introduced species, Aquatic Science, biology.organism_classification, 010603 evolutionary biology, 01 natural sciences, Gambusia, Mosquito larvae, Mosquitofish, Ecology, Evolution, Behavior and Systematics
Abstract: Fil: Cabrera, Maria Belen. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - La Plata. Instituto de Investigaciones Biotecnologicas. Universidad Nacional de San Martin. Instituto de Investigaciones Biotecnologicas; Argentina
Published: 2017
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39. First marine ichthyofauna from the late Eocene of Santa Cruz province, patagonia, Argentina

Author: Silvio Casadío, Federico L. Agnolin, and Sergio Bogan
Subjects: 010506 paleontology, Fossil Record, biology, Ecology, Argentina, Geology, 010502 geochemistry & geophysics, biology.organism_classification, Striatolamia, Eocene, 01 natural sciences, Carcharias, Macrorhizodus Praecursor, Striatolamia Macrota, Abundance (ecology), Pristiophoridae, Temperate climate, Patagonia, Assemblage (archaeology), Ciencias Exactas y Naturales, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract: Fil: Agnolin, Federico. Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”. Centro de Ciencias Naturales, Ambientales y Antropológicas, Fundación de Historia Natural Félix de Azara - Universidad Maimónides. CONICET. Argentina. Fil: Bogan, Sergio. Centro de Ciencias Naturales, Ambientales y Antropológicas, Fundación de Historia Natural Félix de Azara - Universidad Maimónides. Buenos Aires, Argentina. Fil: Casadio, Silvio. CONICET. Universidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina. The fossil record of chondrichthyans in Argentina is still poorly known. The aim of the present contribution is to describe teeth representing a chondrichthyan assemblage from Man Aike Formation (late Eocene) exposed in the Lago Argentino area, at Santa Cruz province, Argentina. This report includes Striatolamia macrota, Macrorhizodus praecursor, Carcharias sp., a possible member of the family Pristiophoridae, for the Argentine territory. Previous Eocene reports of Striatolamia macrota from Argentina are based on incorrect determination of specimens. The shark association, especially the abundance of lamniforms, may be indicative of litoral and shallow (less than 30 m depth) temperate to cold waters, as suggested by micropaleontological content.
Published: 2020

40. Hallazgos Paleontológicos en la Formación Chorrillo (Campaniano-Maastrichtiano, Cretácico Superior), Provincia de Santa Cruz, Patagonia, Argentina

Author: Martín D. Ezcurra, Federico L. Agnolin, Federico Brissón-Eli, Julia D´Angelo, Mariela S. Fernández, Mauricio A. Cerroni, Fátima Fernanda Brito, Sergio Eduardo Miquel, Adriel Roberto Gentil, Matías J. Motta, Gastón E. Lo Coco, Ezequiel Ignacio Vera, Sergio Bogan, Alexis M. Aranciaga-Rolando, Jordi A. Garcia-Marsà, Valeria Susana Perez Loinaze, Agustín G. Martinelli, Sebastián Rozadilla, Leonardo T. Salgado, Fernando E. Novas, Gerardo Álvarez-Herrera, and Nicolás Roberto Chimento
Subjects: 010506 paleontology, Titanosaur, 010502 geochemistry & geophysics, Formación Chorrillo, 01 natural sciences, Paleontología, Ciencias de la Tierra y relacionadas con el Medio Ambiente, purl.org/becyt/ford/1 [https], purl.org/becyt/ford/1.5 [https], Paleontology, FOSSILS, SOUTHERN PATAGONIA, CHORRILLO FORMATION, Saltasaurinae, Patagonia austral, Ecology, Evolution, Behavior and Systematics, 0105 earth and related environmental sciences, biology, biology.organism_classification, Mosasaur, Cretaceous, LATE CRETACEOUS, Abelisauridae, Geography, Neognathae, Animal Science and Zoology, Cretácico Tardío, Fósiles, Calyptocephalellidae, Iguanodontia, CIENCIAS NATURALES Y EXACTAS
Abstract: The first fossil remains of vertebrates, invertebrates, plants and palynomorphs of the Chorrillo Formation (Austral Basin), about 30km to the SW of the town of El Calafate (Province of Santa Cruz), are described. Fossils include the elasmarian (basal Iguanodontia) Isasicursor santacrucensis gen. et sp. nov., the large titanosaur Nullotitan glaciaris gen. et sp. nov., both large and small Megaraptoridae indet., and fragments of sauropod and theropod eggshells. The list of vertebrates is also composed by the Neognathae Kookne yeutensis gen. et sp. nov., two isolated caudal vertebrae of Mammalia indet., and isolated teeth of a large mosasaur. Remains of fishes, anurans, turtles, and snakes are represented by fragmentary material of low taxonomical value, with the exception of remains belonging to Calyptocephalellidae. On the other hand, a remarkable diversity of terrestrial and freshwater gastropods has been documented, as well as fossil woods and palinological assemblages. The Chorrillo Formation continues south, in the Las Chinas River valley, southern Chile, where it is called Dorotea Formation. Both units share in their lower two thirds abundant materials of titanosaurs, whose remains cease to appear in the upper third, registering only elasmarians (Chorrillo Formation) and hadrosaurs (Dorotea Formation). Above both units there are levels with remains of invertebrates and marine reptiles. It is striking that the dinosaurs of the lower two thirds of the Chorrillo and Dorotea formations are represented by large basal titanosaurs and Megaraptoridae coelurosaurs, being the Saltasaurinae and Aeolosaurinae sauropods and Abelisauridae theropods totally absent. In contrast, these taxa are dominant components in sedimentary units of central and northern Patagonia (e.g., Allen, Los Alamitos, La Colonia formations). Such differences could reflect, in part, a greater antiquity (i.e., late Campanian-early Maastrichtian) for the Chorrillo fossils, or, more probably, different environmental conditions. Thus, knowledge of the biota of the southern tip of Patagonia is expanded, particularly those temporarily close to the K-Pg boundary. Fil: Novas, Fernando Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Agnolin, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Universidad Maimónides; Argentina. Fundación de Historia Natural Félix de Azara; Argentina Fil: Rozadilla, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Aranciaga Rolando, Alexis Mauro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Brissón Egli, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Motta, Matias Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Cerroni, Mauricio Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Martinelli, Agustín Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: D'angelo, Julia Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Alvarez Herrera, Gerardo Paulino. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Gentil, Adriel Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Bogan, Sergio. Universidad Maimónides; Argentina Fil: Chimento, Nicolás Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: García Marsa, Jordi Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Lo Coco, Gastón Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Miquel, Sergio Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Brito, Fátima Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Vera, Ezequiel Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Universidad de Buenos Aires; Argentina Fil: Perez Loinaze, Valeria Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Fernández, Mariela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina Fil: Salgado, Leonardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina. Universidad Nacional de Río Negro; Argentina
Published: 2019

41. Review of the enigmatic 'shark', Platyacrodus unicus Ameghino, 1935, from the Paleocene of Patagonia, Argentina: a history of palaeontologists, sharks and crabs

Author: Sergio Bogan, Martín D. Ezcurra, and Federico L. Agnolin
Subjects: biology, Brachyura, Fossils, Holotype, Argentina, Zoology, biology.organism_classification, Crustacean, Genus, Heterodontidae, Sharks, Animals, Animal Science and Zoology, Carapace, Clade, Cenozoic, Ecology, Evolution, Behavior and Systematics
Abstract: Platyacrodus unicus Ameghino, 1935, was described as an enigmatic shark probably related to the clade Heterodontidae. This species was described based on a single, small crushing tooth-like element coming from the “Salamancan” (Danian) of the Western Río Chico locality, Chubut province, Patagonia, Argentina. The holotype and only known specimen was never figured and only briefly characterized by its original describer Florentino Ameghino. The finding of the original figures and holotype specimen allows for a re-evaluation of the taxonomic status of this species. Here, Platyacrodus unicus is reinterpreted as the carapace of a small retroplumid crab of the genus Costacopluma Collins & Morris, 1975.
Published: 2019

42. Armored catfish (Siluriformes: Loricariidae) from the Miocene of southern Pampas and its palaeobiogeographical implications

Author: Federico L. Agnolin and Sergio Bogan
Subjects: 0106 biological sciences, 010506 paleontology, Range (biology), Loricariidae, PECTORAL SPINE, Late Miocene, 010603 evolutionary biology, 01 natural sciences, Paleontología, Ciencias de la Tierra y relacionadas con el Medio Ambiente, PALAEOBIOGEOGRAPHY, purl.org/becyt/ford/1 [https], Paleontology, purl.org/becyt/ford/1.5 [https], Clade, 0105 earth and related environmental sciences, biology, Ecology, biology.organism_classification, Geography, CHASICÓ, LORICARIIDAE, %22">Fish , CIENCIAS NATURALES Y EXACTAS, Catfish
Abstract: Armored catfishes are grouped within the clade Loricariidae. They are typically Brazilian freshwater fishes that show a high taxonomic diversity in South America and are distributed from Costa Rica to Buenos Aires province, Argentina. The aim of the present contribution is to describe an isolated pectoral spine of a loricariid coming from Late Miocene beds of southern Pampas, at Buenos Aires province, Argentina. This record constitutes the first finding of a fish in the Chasicó area, Arenas Blancas fossiliferous site, and is located far from the current geographical range of loricariids. The finding of a loricariid is congruent with the idea of a warm climate and the possibility that southern paleobasins of Pampas and northern Patagonia were hydrographically connected with paleobasins that hold Brazilian freshwater fishes. Fil: Bogan, Sergio. Fundación de Historia Natural Félix de Azara; Argentina. Universidad Maimónides; Argentina Fil: Agnolin, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Fundación de Historia Natural Félix de Azara; Argentina. Universidad Maimónides; Argentina
Published: 2019
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43. Short note were ibises (Aves, Threskiornithidae) present in Antarctica?

Author: Federico L. Agnolin, Sebastián Rozadilla, and Sergio Bogan
Subjects: biology, Ibises, Zoology, Geology, Threskiornithidae, Oceanography, biology.organism_classification, Paleontología, Ciencias de la Tierra y relacionadas con el Medio Ambiente, Geography, Antarctica, Aves, Ecology, Evolution, Behavior and Systematics, CIENCIAS NATURALES Y EXACTAS
Abstract: The fossil record of ibises is largely incomplete and very patchy. In this sense, the early record of ibises remains poorly documented, being represented by an isolated tibiotarsus from the Eocene of Myanmar (Stidham et al. 2016), and the enigmatic genus Rynchaeites from the Middle Eocene of Germany and Denmark (Mayr & Bertelli 2011). In South America and Antarctica, the oldest records correspond to the Lower Miocene Protibis cnemialis Ameghino 1891 (Tonni, 1980), and an indeterminate Late Eocene ibis-like bill from Antarctica (Jadwiszczak et al. 2008). The latter specimen was originally described by Jadwiszczak et al. (2008) who tentatively ascribed the bill to Threskiornithidae. If correctly identified, the specimen would constitute the oldest record of the clade for the Southern Hemisphere. Fil: Agnolin, Federico Lisandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Universidad Maimónides; Argentina. Fundación de Historia Natural Félix de Azara; Argentina Fil: Bogan, Sergio. Universidad Maimónides; Argentina. Fundación de Historia Natural Félix de Azara; Argentina Fil: Rozadilla, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Published: 2019

44. Review of the distribution of Glanidium ribeiroi Haseman, 1911 in Argentina (Siluriformes: Auchenipteridae)

Author: Yamila Paula Cardoso and Sergio Bogan
Subjects: Paleontology, Glanidium, Geography, Distribution (number theory), biology, Animal Science and Zoology, biology.organism_classification, Ecology, Evolution, Behavior and Systematics
Published: 2017
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45. First fossil record of the catfish genus Sorubim (Siluriformes, Pimelodidae), from the Late Miocene of Paraná, Northeastern Argentina

Author: Federico L. Agnolin and Sergio Bogan
Subjects: 010506 paleontology, Fossil Record, Sorubim, biology, Paleontology, Zoology, Late Miocene, biology.organism_classification, 01 natural sciences, Pimelodidae, Geography, Extant taxon, Genus, 0105 earth and related environmental sciences, Catfish
Abstract: The aim of the present contribution is to describe a partial fossil skull belonging to the catfish genus Sorubim. The specimen originates from the Late Miocene Ituzaingo Formation, at Parana locality, Entre Rios Province, Argentina. The material described here (MACN Pv-14224) was determined just to genus because the living species of Sorubim are morphologically similar. Presence of Sorubim is in concordance with the hypothesis indicating that most extant pimelodid genera were already present by the Late Miocene. Present finding constitutes the first fossil record for the genus.
Published: 2021
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46. A Pleistocene freshwater ichthyofaunal assemblage from central Argentina: What kind of fishes lived in the Pampean lagoons before the extinction of the megafauna?

Author: Daniel A. Tassara, Federico L. Agnolin, Marcos Cenizo, Adrián Giacchino, and Sergio Bogan
Subjects: Atmospheric Science, Marine and Aquatic Sciences, Fresh Water, Cyprinodontiformes, Pleistocene Epoch, Megafauna, Geological Facies, History, Ancient, Marine Fossils, Climatology, Quaternary Period, Multidisciplinary, biology, Fossils, Ecology, Fishes, Eukaryota, Geology, Oligosarcus, Freshwater Fish, Geography, Vertebrates, Medicine, Lithofacies, Odontesthes, Research Article, Freshwater Environments, Pleistocene, Science, Argentina, Ecoregion, Corydoras, Animals, Paleoclimatology, Paleozoology, Ecology and Environmental Sciences, Organisms, Biology and Life Sciences, Paleontology, Aquatic Environments, Geologic Time, biology.organism_classification, Fish, Mollusca, Pimelodella, Earth Sciences, Cenozoic Era, Paleobiology
Abstract: This study contributes to the knowledge of continental fishes recovered from sedimentary successions corresponding to the Bonaerean Stage/Age (late mid-Pleistocene) in the locality of Centinela del Mar, General Alvarado County, Buenos Aires province, Argentina. At this site we describe fossil fishes from a palaeolagoon, including Corydoras sp., Pimelodella sp., Rhamdia sp., Oligosarcus sp., small undetermined characids, Jenynsia sp. and Odontesthes sp. The recovered ichthyofaunal assemblage comprises at least seven taxa of Paranaean lineage. The taxonomic composition of the palaeoichthyofauna is quite comparable to that presently found in Bonaerean Watercourses of the Atlantic Drainage ecoregion. This suggests that local ichthyofaunal communities have remained relatively stable since the late mid-Pleistocene.
Published: 2020
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47. Goliath catfish Brachyplatystoma Bleeker, 1862 (Siluriformes: Pimelodidae) from the Miocene of Argentina

Author: Sergio Bogan and Federico L. Agnolin
Subjects: 010506 paleontology, geography, geography.geographical_feature_category, biology, Drainage basin, Geology, Goliath catfish, Structural basin, Late Miocene, 010502 geochemistry & geophysics, biology.organism_classification, 01 natural sciences, Fishery, Pimelodidae, Genus, Brachyplatystoma, Hydrography, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract: Brachyplatystoma is a genus of freshwater catfishes endemic of South America that includes one the largest siluriform species of the neotropics. The fossil record of the genus is restricted to the Miocene of Colombia and Venezuela and the extant species are distributed along Orinoco and Amazonas basins. The present works aims to describe a new species of Brachyplatystoma from late Miocene deposits at Entre Rios Province, Argentina. The present report constitutes the first finding of Brachyplatystoma in the Paleoparana Basin, which is in agreement with previous hypothesis indicating hydrographic connections of this river basin with the Amazon basin until at least the early late Miocene times.
Published: 2020
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48. Phractocephaline catfishes from the late Miocene of Argentina, with the description of a new taxon

Author: Federico L. Agnolin and Sergio Bogan
Subjects: Phractocephaline, 0106 biological sciences, 010506 paleontology, Fossil Record, catfishes, Paleontology, Extinct species, Miocene, Late Miocene, 010603 evolutionary biology, 01 natural sciences, Paleontología, Ciencias de la Tierra y relacionadas con el Medio Ambiente, Taxon, Geography, Phractocephalus, CIENCIAS NATURALES Y EXACTAS, 0105 earth and related environmental sciences
Abstract: The fossil record of ‘phractocephaline’ catfishes in South America is relatively rich. The extinct species Phractocephalus ivy Azpelicueta and Cione, 2016, was named on the basis of diverse material coming from late Miocene beds of Paraná City, Argentina. A review of the holotype specimen described by those authors allows us to recognize that the individual may be referred to the extant genus Steindachneridion; thus, we propose the new taxonomic combination Steindachneridion ivy. Furthermore, part of the material described by previous authors may be effectively included within Phractocephalus. In this sense, the finding of new specimens in paleontological collections allows us to refer all these specimens to a new, previously unrecognized Phractocephalus species. The fossil record of ‘phractocephalines’ in the Paraná paleobasin indicates that the area played an important role in the evolution of this clade of basal pimelodids. Fil: Bogan, Sergio. Fundación de Historia Natural Félix de Azara; Argentina. Universidad Maimónides; Argentina Fil: Agnolin, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Fundación de Historia Natural Félix de Azara; Argentina. Universidad Maimónides; Argentina
Published: 2019
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49. An integrated approach clarifies the cryptic diversity in Hypostomus Lacépède 1803 from the Lower La Plata Basin

Author: Juan I. Montoya-Burgos, Paula Posadas, Ariel Hernán Paracampo, Yamila Paula Cardoso, Lucila Cristina Protogino, Florencia Brancolini, and Sergio Bogan
Subjects: 0106 biological sciences, 0301 basic medicine, Range (biology), Argentina, Morphology (biology), 010603 evolutionary biology, 01 natural sciences, Ciencias Biológicas, purl.org/becyt/ford/1 [https], molecular phylogenetics, 03 medical and health sciences, Species Specificity, Paraná Basin, Animals, lcsh:Science, purl.org/becyt/ford/1.6 [https], Hypostomus, Catfishes, Phylogeny, Multidisciplinary, Geography, Phylogenetic tree, biology, Zoología, Ornitología, Entomología, Etología, Biodiversity, biology.organism_classification, PARANA BASIN, freshwater fishes, Spiniger, 030104 developmental biology, Evolutionary biology, Molecular phylogenetics, Conservation status, lcsh:Q, Species inquirenda, CIENCIAS NATURALES Y EXACTAS, Brazil
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. paranensis should be considered as species inquirenda and H. cordovae as valid species. This integrated approach provides key information for assessing the conservation status and biogeographic aspects of the genus Hypostomus in the Lower La Plata Basin. Fil: Cardoso, Yamila Paula. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Laboratorio de Sistemática y Biología Evolutiva; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina Fil: Brancolini, Florencia. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigación e Ingeniería Ambiental; Argentina Fil: Protogino, Lucila Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentina Fil: Paracampo, Ariel Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología "Dr. Raúl A. Ringuelet". Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Limnología; Argentina Fil: Bogan, Sergio. Universidad Maimónides; Argentina. Fundación de Historia Natural Félix de Azara; Argentina Fil: Posadas, Paula Elena. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Laboratorio de Sistemática y Biología Evolutiva; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina Fil: Montoya Burgos, Juan Ignacio. Universidad de Ginebra; Suiza
Published: 2019

50. A continental-wide molecular approach unraveling mtDNA diversity and geographic distribution of the Neotropical genus Hoplias

Author: Juan Martín Díaz de Astarloa, Matías Delpiani, Sergio Bogan, Esteban Avigliano, Ezequiel Mabragaña, Yamila Paula Cardoso, Mariano González-Castro, Raphaël Covain, Nahuel Francisco Schenone, and Juan José Rosso
Subjects: 0106 biological sciences, 0301 basic medicine, HOPLIAS, Molecular biology, Biología, lcsh:Medicine, purl.org/becyt/ford/1.7 [https], Marine and Aquatic Sciences, Fresh Water, 01 natural sciences, DNA barcoding, Biochemistry, Hoplias malabaricus, purl.org/becyt/ford/1 [https], Monophyly, lcsh:Science, Clade, Phylogeny, Energy-Producing Organelles, Data Management, Molecular systematics, Multidisciplinary, Phylogenetic analysis, biology, Geography, Ecology, Freshwater fish, Otras Ciencias Naturales y Exactas, Fishes, Eukaryota, Phylogenetic Analysis, Biodiversity, Mitochondria, Phylogenetics, Freshwater Fish, Phylogeography, Biogeography, Vertebrates, Cellular Structures and Organelles, CIENCIAS NATURALES Y EXACTAS, Research Article, Freshwater Environments, Species complex, Computer and Information Sciences, Ecological Metrics, Argentina, Bioenergetics, 010603 evolutionary biology, DNA, Mitochondrial, COI, 03 medical and health sciences, Rivers, Genetics, Animals, DNA Barcoding, Taxonomic, Evolutionary Systematics, Taxonomy, Tropical Climate, Evolutionary Biology, Population Biology, lcsh:R, Ecology and Environmental Sciences, Organisms, Species diversity, Genetic Variation, Biology and Life Sciences, Aquatic Environments, Species Diversity, Cell Biology, FRESHWATER, Bodies of Water, biology.organism_classification, Genetic divergence, Research and analysis methods, 030104 developmental biology, Molecular biology techniques, Fish, Evolutionary biology, SUDAMERICA, Hoplias, Earth Sciences, lcsh:Q, Population Genetics
Abstract: 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 diversity within the valuable and widespread Neotropical genus Hoplias was assessed by means of DNA Barcoding. The geographic coverage spanned 40 degrees of latitude from French Guiana to Argentina. Our analyses revealed 22 mitochondrial lineages fully supported by means of Barcode Index Number, Automatic Barcode Gap Discovery and phylogenetic analyses. This mtDNA survey revealed the existence of 15 fully supported mitochondrial lineages within the once considered to be the continentally distributed H. malabaricus. Only four of them are currently described as valid species however, leaving 11 mitochondrial lineages currently “masked” within this species complex. Mean genetic divergence was 13.1%. Barcoding gap analysis discriminated 20 out of the 22 lineages tested. Phylogenetic analyses showed that all taxonomically recognized species form monophyletic groups. Hoplias malabaricus sensu stricto clustered within a large clade, excluding the representatives of the La Plata River Basin. In the H. lacerdae group, all species but H. curupira showed a cohesive match between taxonomic and molecular identification. Two different genetic lineages were recovered for H. aimara. Given the unexpected hidden mitochondrial diversity within H. malabaricus, the COI sequence composition of specimens from Suriname (the type locality), identified as H. malabaricus sensu stricto, is of major importance., Facultad de Ciencias Naturales y Museo
Published: 2018
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