Felipe Alonso

National Scientific and Technical Research Council | conicet · IBIGEO - Instituto de Bio y Geociencias del NOA

We present a new record for Austrolebias elongatus from Gualeguaychú, in Entre Ríos province, Argentina, based on new fieldwork and a revision of material deposited in national ichthyological collections. We also give evidence on the erroneous records of Austrolebias monstrosus and A. vandenbergi from Ituzaingó, Corrientes province, as well as pres...

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...

Gymnogeophagus jaryi, new species, is described from Southern tributaries of the Middle Paraná basin in Misiones. It can be distinguished from all other members of the genus, except from G. australis and G. caaguazuensis, by the presence of a hyaline to grey anterior portion of the dorsal fin. Gymnogeophagus jaryi differs from G. caaguazuensis by a...

Killifishes (Cyprinodontiformes) are a group of fish that include a high proportion of small-bodied species living in seasonal aquatic habitats, with narrow geographical distributions and high human impact. They are among the most vulnerable vertebrates in the Neotropical region, with nearly half of the species in threat categories. Herein, we prop...

We describe Argolebias adrianae, a new species of killifish from a small temporary wetland in the Paraná Forest ecoregion with no regular or predictable temporal pattern of water availability. This habitat is in the Lower Iguazú River Basin, known for its high fish endemism, but until now, only two species of Rivulidae were reported from it, but fr...

The knowledge about the diversity and phylogeny of South American callichthyid armored catfishes of the sub-family Corydoradinae is still growing, after important recent contributions, and many species have uncertain relationships. In this study, we present the first combined phylogenetic hypothesis for the genus based on five genes, 83 morphologic...

Clinostomids are a group of digeneans in which substantial diversity has been recently discovered, with some metacercariae specific to their fish hosts. Genetic analysis has been instrumental in elucidating species diversity within this genus. Recently, seven COI lineages were reported in Argentina, along with three metacercarial morphotypes lackin...

Hatching dynamics is key to population structure of annual fishes in temporary wetlands. Given the risk of false starts due to unpredictable hydroperiods, annual fish may employ risk‐spreading strategies in their hatching patterns consistent with bet hedging (such as the partial hatching of their egg bank and variable number of hatching cues) after...

A new killifish species was discovered in the heart of the Paraná Forest ecoregion, in a small temporary puddle among the jungle trees. Argolebias adrianae represents a novel addition to the world of killifishes. This small species thrives in an ephemeral and ever-changing environment, a temporary wetland on the banks of the Iguazú River, where the...

Una nueva especie de pez que vive en charcos temporarios de lluvia es descubierta en el corazón de la Selva Misionera, a pasos de las Cataratas del Iguazú. Una nueva especie de pez killi fue descubierta en el corazón de la ecorregión del Bosque Paraná, en un pequeño charco temporario entre los árboles de la selva. Argolebias adrianae, representa un...

Ante la crisis global de pérdida de biodiversidad y deterioro de los ecosistemas, las áreas naturales protegidas tienen un rol preponderante como herramienta de manejo. Sin embargo, la mayoría se basa sobre criterios terrestres, mientras que los organismos de agua dulce son los más amenazados en cuanto a su conservación. En este trabajo se analiza...

Un reciente estudio sobre la evolución de los peces del género Austrolebias ha generado importantes hallazgos sobre su clasificación y evolución. Este estudio, ha permitido dividir este grupo en 11 géneros, incluyendo 4 nuevos, y ha brindado una mayor claridad sobre la evolución y características de estos singulares peces. A continuación, destacamo...

En las charcas temporarias del Río Paraná Medio, en el corazón de la provincia de Misiones, Argentina, se ha descubierto una nueva especie de pez estacional, Argolebias guarani, con una impactante coloración en los machos. Su cuerpo y aletas están completamente cubiertos de iridiscencias turquesas. Este asombroso pez habita en charcas que se forman...

A recent study invetigating the evolution of Austrolebias

In the temporary ponds of the Middle Paraná River, in the heart of the province of Misiones, Argentina, a new seasonal fish species has been discovered: Argolebias guarani. This species exhibits a striking coloration in males, with their bodies and fins completely covered with turquoise iridescent blotches. This astonishing fish inhabits ponds that...

La biología del siglo XX se caracterizó por una creciente especialización y compartimentalización de sus diferentes disciplinas, como la ecología, biología molecular, comportamiento, genética y fisiología, que desarrollaron sus propias tradiciones y teorías con poco diálogo entre ellas. A medida que avanzaba el siglo, surgieron voces que abogaban p...

Materiales y métodos Durante viajes de muestreo realizados a un arroyo de vertiente termal y con grandes concentraciones de sulfuros en el Departamento de Santa Bárbara de la provincia de Jujuy se colectaron ejemplares de Jenynsia sulfúrica (Fig. 1). Los peces se llevaron al laboratorio y se mantuvieron en el acuario con agua de lugar y oxígeno adi...

In this note we present the first evidence based record for Hypostomus isbrueckeri from Argentina and extend its known geographical distribution 500 km to the SW of the previous mentions.

Mojarra Andromakhe latens has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Andromakhe latens is listed as Endangered under criteria B1ab(iii).

Austrolebias patriciae has most recently been assessed for The IUCN Red List ofThreatened Species in 2020. Austrolebias patriciae is listed as Vulnerable under criteriaB1ab(iii,iv)+2ab(iii,iv); D2.

Austrolebias monstrosus has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Austrolebias monstrosus is listed as Vulnerable under criteria D2.

Austrolebias robustus has most recently been assessed for The IUCN Red List of Threatened Species in 2020. Austrolebias robustus is listed as Vulnerable under criteria B2ab(iii,iv); D2.

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 det...

En octubre de 2019 se realizó un trabajo de muestreo de Peces en el Parque Nacional el Rey. Se registraron un total de 16 especies, de las cuales, 5 fueron registradas con un único ejemplar, lo cual indica que aún es necesario incrementar considerablemente los esfuerzos de muestreo para tener una muestra representativa de los peces que habitan esta...

Probably the last place one would expect to find a fish is out of the water, and much less buried underground. However, there are some fish that live in rain ponds that dry completely for long periods and survive because they have eggs that resist desiccation buried at the bottom of the puddle. With the arrivals of the rains these ponds accumulate...

Probablemente el último lugar en el que uno esperaría encontrar un pez es fuera del agua, y mucho menos enterrado bajo tierra. Sin embargo, hay unos peces que viven en charcas de lluvia que se secan completamente durante largos periodos y sobreviven gracias a que tienen huevos que resisten el desecamiento enterrados en el fondo del charco. Con las...

Freshwater sulfide springs have extreme environmental conditions that only few vertebrate species can tolerate. These species often develop a series of morphological and molecular adaptations to cope with the challenges of life under the toxic and hypoxic conditions of sulfide springs. In this paper, we described a new fish species of the genus Jen...

Austrolebias (Costa, 1998) habitam lagoas sazonais na porção sul do Neotrópico na drenagem de La Plata, com uma espécie da bacia Amazônica no Chaco Boliviano. Este gênero habita o Uruguai (drenagem do rio Uruguai e drenagens costais) e o sul do Brasil (drenagens do rio Uruguai e do rio Iguaçu e drenagens costais), onde apresenta maior diversidade d...

List of material examined. (PDF)

Character matrix used for the phylogenetic analysis. (TNT)

Phylogenetic relationships and molecular species delimitation from BEAST analysis. (PDF)

A key question in ecological speciation is to understand the causes and consequences of phenotypic divergence among populations. In this work, we analyzed the body shape and size variation in Jenynsia lineata across different coastal habitats along the Atlantic coast of South America. We hypothesized that J. lineata presents morphological variation...

A redescription of Corydoras undulatus Regan, 1912 is presented. The original description of C. undulatus is very succinct, as is its diagnosis, which is based only on external morphology. Additional information in the scientific literature on this species is scarce. Specimens from the distribution area of this species were analyzed; Paraná and Par...

A new species of Farlowella is described from the Bermejo River basin, in Salta and Jujuy provinces, northwestern Argentina. The new species belongs to the Farlowella nattereri species group. The new species is diagnosed by the following combination of characters: marbled rostrum, five rows of lateral plates series, relatively short snout (snout-mo...

El presente libro se focaliza en las especies ícticas más abundantes y/o representativas del río Uruguay en su tramo compartido entre Argentina y Uruguay, llegando a un total de 81 especies. El mismo tiene por objeto obrar de guía de campo práctica y visual para el público en general, e incluye consideraciones generales a nivel geográfico, ictiológ...

Recent expeditions to northwestern Argentina revealed the presence of an unknown species of Curimatidae for the Bermejo river basin. The morphometric and meristic analyses of these specimens allow us to identify them as Stein-dachnerina insculpta (Fernández-Yépez, 1948), which is here reported for the first time in Argentina.

The family Rivulidae is the fourth most diverse clade of Neotropical fishes. Together with some genera of the related African family Nothobranchiidae, many rivulids exhibit a characteristic annual life cycle, with diapausing eggs and delayed embryonic development, which allows them to survive in the challenging seasonal ponds that they inhabit. Riv...

Many fish enthusiasts and amateur ichthyologists have been conducting collecting trips and making big collecting efforts in the past decades contributing to the knowledge of fishes. Nevertheless, there is not a standardised collecting protocol which can lead to deficient data availability or to poor preservation of specimens. Therefore, here we pre...

New records of Corydoras micracanthus from the Bermejo River basin are presented. We confirm the presence of this species in the province of Jujuy, based on deposited material. In addition, its type locality in Lesser, Salta is confirmed, after new data obtained from bibliography regarding the collecting localities of Alfredo Borelli, collector of...

Character matrix used for the phylogenetic analysis. (PDF)

List of material examined. (PDF)

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

Los peces anuales, o mejor llamados "estacionales", ya que muchos pueden tener más de un ciclo en un año (Costa, 2002; Alonso et al., 2016) o ciclos no completamente regulares que pueden extenderse por más de un año, presentan una serie de adaptaciones que les permiten vivir en ambientes acuáticos efímeros, que por lo general se secan completamente...

Los nombres Killi, en español, y Killifish, en inglés, el primero derivado del segundo, son actualmente utilizados por los aficionados al acuarismo para referirse a un gran número de especies de peces pertenecientes al orden Cyprinodontiformes, presentes en casi todos los continentes, a excepción de la Antártida y Oceanía, en zonas templadas y trop...

The name Killifish is currently used by aquarim enthusiast and scientist to refer to a large number of fish species belonging to the order Cyprinodontiformes, which are present on almost all continents, with the exception of Antarctica and Oceania, in temperate and tropical zones. However, the first known reference to this name comes from the Unite...

Nuevos registros de Austrolebias alexandri (Castello y López 1974) (Cyprinodontiformes, Rivulidae).

Cetopsorhamdia is a genus of Neotropical catfishes with a broad distribution in the main drainages of South America. Herein we report the first record of Cetopsorhamdia iheringi in Argentina and comment on the type series of the species.

In this paper we describe Heptapterus mandimbusu sp. n., a new species of heptapterid catfish from a small tributary of the Uruguay River Basin in Misiones-Argentina. This new species is distinguished from all other congeners by the unique coloration pattern with aggregated melanophores scattered on dorsal and lateral surface of body, forming consp...

Gymnogeophagus lipokarenos is registered for the first time from Argentina in the Province of Misiones. The species was originally described as endemic to the Upper Uruguay freshwater ecoregion in Brazil. Our findings extend its distribution into the Lower Uruguay ecoregion throughout the province of Misiones.

A new species assigned to the genus Trichomycterus from the area of the waterfalls of Tabay stream, Paraná River basin, Misiones, Argentina, is described. Trichomycterus ytororo sp. nov. is distinguished from all other species in the genus by the presence of 31–35 dorsal procurrent caudal-fin rays and the combination of some external characters suc...

List of material examined. (PDF)

With additional morphometric and meristic tables. (PDF)

Recently, Gymnogeophagus terrapurpura Loureiro, Zarucki, Malabarba & González-Bergonzoni, 2016 was described as a member of the substrate brooding Gymnogeophagus-rhabdotus-group from the East of the lower Uruguay river basin, the Eastern coastal affluents of the Río de la Plata estuary, and affluents of the Atlantic Ocean in Uruguay. The aim of thi...

Microglanis nigrolineatus, new species, is described from streams of Bermejo River basin, northwestern Argentina. It is distinguished from all congeners by a combination of characters including a unique coloration pattern: a thin dark line that runs along middle body from vertical line through dorsal-fin origin to end of adipose fin, delimiting two...

Hypostomus cochliodon Kner, 1854 had been recorded from Paraguay and Paraná rivers in Argentina. We recorded for the first time specimens of H. cochliodon to the Bermejo River basin. It is also the first record of this species to Salta province, Argentina.

Hypostomus boulengeri (Eigenmann and Kennedy, 1903) is a poorly known species recorded from the Paraguay and Paraná River basins. In this work we report the occurrence of this species in the Bermejo River basin for the first time, representing a distribution range extension of more than 600 km.

Cardinal neon Paracheirodon axelrodi and bloodfin tetra Aphyocharax anisitsi are two species of characids with high trade value as ornamental fish in South America. Although both species inhabit middle water layers, cardinal neon exhibits a tropical distribution and bloodfin tetra a subtropical one. In this work, we carried out an anatomical, histo...

Aphyocharax anisitsi is recorded for the first time from the upper Bermejo River, Argentina, in the provinces of Salta and Jujuy. This represents a range extension of the known distribution of approximately 600 km. Also, collection specimens of A. dentatus from this area are cited for first time.

Intense sampling in the upper Bermejo River basin revealed the presence of specimens of the aspredinid genus Bunocephalus. After detailed morphological and morphometric analyses specimens were identified as Bunocephalus doriae. This is the first record of any member of the Aspredinidae in the upper Bermejo River basin.

The first report of the genus Jenynsia occurring in marine waters is presented here. The evolution of high salinity tolerance within Anablepidae is discussed and a hypothesis is proposed that this characteristic is a plesiomorphic trait in Jenynsia which was probably present in the common ancestor of the Anablepidae.

The occurrence of Astyanax dissensus in the Uruguay River, at Yapeyú, Corrientes, Argentina is reported for the first time in the country.