Sergio D. Ríos

Secretaría Nacional de Cultura, Paraguay · Arqueología y Paleontología

En la presente contribución se describe una nueva localidad fosilífera, denominada Puerto Santa Rosa, cuyo nivel aflora en las márgenes del Río Paraguay, en el Departamento de San Pedro, Paraguay. Los materiales recuperados han sido asignados taxonómicamente a Megatherium cf. M. americanum (Pilosa), Toxodon sp. (Notoungulata), cf. Notiomastodon (Pr...

Notes on the geographic distribution and subspecific taxonomy of Sais rosalia (Cramer) (Lepidoptera, Nymphalidae, Ithomiini), including the first records in Paraguay. This paper provides comments on the subspecific taxonomy and geographic distribution of Sais rosalia (Cramer, 1779) (Lepidoptera, Nymphalidae, Ithomiini), as well as an up-to-date dis...

Two Paraguayan localities expand the known distribution of Geyeria uruguayana, and confirm the species presence in the country. Notes on taxonomic history, distribution, biology and ecology of the species are included. Confirmación de la presencia de Geyeria uruguayana (Burmeister, 1880) en Paraguay, con notas (Lepidoptera: Castniidae) Resumen Do...

Twenty-eight new distribution records are reported for twenty-seven species of Paraguayan reptiles. Eleven of these species are considered threatened at the national level (6 EN, 3 VU, 2 DD). Twenty two new departmental records are documented: Phrynops hilarii (Chelidae) in Misiones department; Homonota marthae, Phyllopezus przewalskii (Phyllodacty...

Datos de la composición química y mineralógica han sido obtenidos de un osteodermo de Neosclerocalyptus sp. (Xenarthra, Chlamyphoridae) del Pleistoceno-Holoceno, extraído “in situ” del sector central de la llanura del mega-abanico aluvial del Río Pilcomayo en el año 2020, aproximadamente a 4 kilómetros de la Colonia Neuland, Departamento de Boqueró...

Two species of procyonid (Nasua nasua and Procyon cancrivorus) and one species of mephitid (Conepatus chinga) have long been documented to occur in Paraguay, but very little has been published about their ecology in the country since the early 19th Century works of Azara and Rengger. Data on the distribution and status of these species in the count...

This article provides an update of the distribution of the Xenarthra fauna of Paraguay. Tamandua tetradactyla is confirmed to occur in all Paraguayan departments. New departmental records of Myrme-cophaga tridactyla are reported for Neembucu, Paraguarí, and San Pedro. Dasypus novemcinctus is reported for Neembucu department for the first time. Two...

La Revista del Museo de La Plata es editada por la Facultad de Ciencias Naturales y Museo de la Universidad Nacional de La Plata. Tiene por objetivo principal servir de vehículo de transmisión del conocimiento a la comunidad científica y académica que realiza su labor de investigación en el ámbito de las Ciencias Naturales. Desde su aparición en 18...

Here we present 19 new or significant herpetofauna departmental records from five Paraguayan departments; Alto Paraguay, Misiones, Ñeembucú, Presidente Hayes and San Pedro with the interest of updating currently understood distributions. Many of these records are common species highlighting the gaps still prevalent in Paraguayan herpetofauna and th...

RESUMEN. Se reporta a Cyanerpes cyaneus y Myiopagis gaimardii como nuevas especies para la avifauna paraguaya y se presentan fotografías y grabaciones de individuos observados en el Departamento de Canindeyú. ABSTRACT. Cyanerpes cyaneus (PASSERIFORMES, THRAUPIDAE) AND Myiopagis gaimardii (PASSERIFORMES, TYRANNIDAE), TWO NEW BIRD SPECIES, WITH A N...

La Dormilona Cara Negra (Muscisaxicola maclovianus) es un ave principalmente terrestre que habita áreas abiertas en los Andes y Patagonia en temporadas de reproducción y zonas costeras y pastizales de menores elevaciones durante el invierno. Presentamos el primer registro de esta ave como un nuevo género y especie en Paraguay con fotografías de un...

RESUMEN. Se reporta a Herpsilochmus longirostris (tiluchí piquilargo) como una nueva especie para la avifauna paraguaya y se presentan fotografías y grabaciones de individuos observados en el Departamento de Canindeyú. ABSTRACT. Herpsilochmus longirostris (PASSERIFORMES, THAMNOPHILIDAE), A NEW SPECIES FOR PARAGUAY. Herpsilochmus longirostris (Larg...

The avifauna of Ñeembucú is currently one of the most understudied within Paraguay, with the true diversity present likely to be greatly underrepresented. In the interests of contributing an up-to-date species list for the department, we present 46 new documented bird records, as well as a list of all 330 documented birds within the department. We...

Although the Sphingidae (hawkmoths) of Paraguay are moderately well-known, comprehensive publications on the fauna are few and far between, and there is no modern taxonomic and biogeographical overview of the available data against which future researchers could work. Here we compile existing published data and review important national collections...

The Ashy-headed Greenlet Hylophilus pectoralis Sclater, 1866 (Aves: Vireonidae), is reported as a new species for the Paraguayan avifauna based on observations at Refugio Biológico de Mbaracayú and Costanera de Salto del Guairá, both in Canindeyú department. Recent records of Rusty-backed Spinetail Cranioleuca vulpina (Pelzeln, 1856 [Aves: Furnarii...

at 72,849 ha the "Área de Reserva para Parque Nacional San Rafael" (departamentos itapúa and caazapá) is the second largest block of upper paraná atlantic forest remaining in eastern paraguay and widely considered the highest priority for conservation of the endemic atlantic forest avifauna in the country (cartes et al. 2008).

The Western conifer seed bug, Leptoglossus occidentalis Heidemann, 1910, native to western North America and in ongoing worldwide expansion, is recorded from Paraguay for the first time.

at 72,849 ha the “Área de Reserva para Parque Nacional San Rafael” (departamentos itapúa and caazapá) is the second largest block of upper paraná atlantic forest remaining in eastern paraguay and widely considered the highest priority for conservation of the endemic atlantic forest avifauna in the country (cartes et al. 2008). the avifauna of the r...

In this work, there were analyzed dental remains of a Toxodon sp. (Mammalia, Notoungulata) specimen rescued from the riverbank of the Ypané River in Paraguay. Several techniques were used to analyze the different geological aspects of the samples, thus providing keys to the understanding of fossilization processes and the implications of paleoenvir...

With just five species, the Paraguayan primate fauna is less diverse than its neighbours and, perhaps as a result of this, few biologists have chosen the country for their primate studies. Consequently, the ecological data available for three of the five species that occur in the country is scant, and most of what we know about the other two is bas...

The discovery of three historic vessels in Paraguay, due to extremely low water levels, has raised public interest in their recovery as well as concern on the part of government institutions and led to a survey by specialists in underwater archaeology to ensure the proper study and conservation of the vessels.

A catalog with 157 specimens of Castniidae belonging to 12 genera and 39 species, curated and preserved in the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (MACN) is presented herein. The list includes 2 syntype specimens (Paysandisia archon & Geyeria uruguayana) originally described by Hermann Burmeister and the holotype of Castnia...

RESUMEN. Se reportan dos ejemplares nuevos de Philodryas agassizii en Paraguay: de las cercanías del Parque Nacional Ybycuí, departamento Paraguarí y de Estancia Santa María, departamento Misiones. Los mismos son los primeros registros con datos fehacientes de colecta en la Región Oriental del país. ABSTRACT. FIRST SPECIMENS WITH LOCALITY DATA OF...

Reportamos un Tamandua tetradactyla albino fotografiado en la naturaleza y proveniente del su-roeste de Paraguay, departamento de Ñeembucú. Se trata aparentemente del primer caso documentado de albinismo en la especie y el primer registro de esta especie en el departamento de Ñeembucú. Palabras clave: albinismo, coloración, Ñeembucú, oso melero...

La ciudad de Asunción (25°16'55.83"S; 57°38'6.48"O) se encuentra situada en la margen derecha del rio Paraguay y se encuentra en el borde del margen occidental de la cuenca del Paraná, lo cual corresponde a la zona centro-oeste de la Región Oriental, con una superficie de 117 Km2. Se destaca por sus colinas de pendientes suaves, por sus planicies d...

La ocurrencia de la esquistosomiasis está directamente relacionada con la presencia de sus huéspedes intermediarios, especies del género Biomphalaria (Gasteropoda, Planorbidae). Aunque no hay en Paraguay reportes oficiales de presencia de Schistosoma mansoni (Trematoda, Schistosomatidae), parásito causante de la enfermedad, se han encontrado en el...

A la fecha se conocen para el Paraguay veinte especies de picaflores o colibríes (Apodiformes, Trochilidae), habiendo sido recientemente adicionadas a la lista de especies paraguayas Chrysolampis mosquitus y Phaetornis subochraceus. En esta contribución reportamos la presencia de una especie adicional: Chionomesa lactea o picaflor de vientre azul....

A melanic specimen of Homothermon praemorsus (Burmeister) (Coleoptera: Scarabaeidae: Rutelinae) is reported. Is also the first record of the genus from Paraguay

Bill deformities in birds are a well-known, but a poorly understood phenomenon, with limited published data from the Neotropics. Bill deformities for five species in five families of Paraguayan birds are reported. These are documented in Veniliornis spilogaster (Picidae), Furnarius rufus (Furnariidae), Myiarchus swainsoni (Tyrannidae), Thraupis say...

Resumen: Se propone que en el acantilado constituido por areniscas rojas de la Formación Itá Pytã Punta, el cabo del mismo nombre, es un arco marino con modelado incipiente por el mar Chaqueño e inconcluso en su evolución por la regresión del mismo durante el Mioceno Superior-Plioceno Inferior.

Resumen.-El Corbatita amarillo Sporophila nigricollis se conocía en Paraguay de sólo tres reportes, todos ellos no documentados con evidencia física. En esta contribución presentamos información de los registros nacionales y la primera documentación fotográfica de la especie en Paraguay. Se considera a la especie como divagante en el país, probable...

Ctenomys dorsalis is known only from its type specimen, a female preserved as skin without skull (except for the upper incisors) from an imprecise locality in the “Northern Chaco of Paraguay”. Here, we report additional individuals of this species housed, since the 1940s, at the Field Museum of Natural History (Chicago, USA). Based on these specime...

“El naturalista suizo-paraguayo Arnaldo de Winkelried Bertoni (1878-1973) constituye una de las figuras más importantes de la ciencia del Paraguay, en particular de la primera mitad del siglo XX. Durante 40 años publicó cerca de doscientas contribuciones sobre ornitología, entomología, mastozoología, herpetología, ictiología, paleontología, arqueol...

It is proposed that two little-known species of Castniidae which have been traditionally assigned to the genus Athis Hūbner belong to other genera; in addition, both have been found to have better-known junior synonyms. The statuses of the following taxa have been revised in this work: Castnia amalthaea H. Druce comb. rest., Castnia lecerfi Dalla T...

Despite great xenarthran biodiversity, the Paraguayan armadillos and anteaters have received little attention from biologists and few data have been published about the distribution and status of the species. Furthermore, errors and contradictions persist in the literature. This paper collates specimen and literature data about this group to act as...

Cyanocorax caeruleus (Vieillot, 1818) is based on the description by Azara of number 55 Urraca Celeste and has traditionally been ascribed the type locality “Paraguay”. However, Azara based his description on captive birds and a lack of reliable records from the country meant that it was recently eliminated from the official country avifaunal list....

Proyectiles utilizados en la Guerra de la Triple Alianza analizados por XRF

Se trata de los primeros aportes obtenidos sobre la presencia de 4 especies de Biomphalaria (Mollusca - Planorbidae) en los humedales del Paraguay; las presencia de las especies detectadas radica en que dos de ellas son vectores transmisores de Schistosoma mansonii, causante de la esquistosomiasis. Se relacionó la presencia de los mismos a la conse...

Cyanocorax caeruleus (Vieillot, 1818) is based on the description by Azara of number 55 Urraca Celeste and has traditionally been ascribed the type locality “Paraguay”. However, Azara based his description on captive birds and a lack of reliable records from the country meant that it was recently eliminated from the official country avifaunal list....

Se evaluaron 179 especies, teniendo al tapiti Sylvilagus brasiliensis y al Dasypus septemcinctus como especies no evaluadas NE (ver capítulo Xenarthra). Entre las especies evaluadas, se resalta que 29 especies fueron catalogadas como Datos Insuficientes o DD, esto significa que la información disponible sobre estas especies en nuestro país es tan e...

Developing paleontology, gold mining in the town of Paso Yobai and diamonds exploration in progress, all in Paraguay, are commented on in this presentation. At the approach, each of them was focused by three technicians of different disciplines. This produces ethical sense in common but with diverse feelings.

Se documenta por primera vez a través de fotografías, la presencia del playero Calidris pusilla en Paraguay. Se indican menciones previas de la especie en el país.

Se postula que en el acantilado constituido por areniscas rojas de la Formación Itá Pytã Punta se observa un arco marino con modelado incipiente por el mar Chaqueño e inconcluso en su evolución por la regresión del mismo. En principio, el cabo se había formado por erosión costera selectiva y socavamiento en ambos flancos para el desarrollo de las h...

An annotated catalogue of the hawkmoths (Sphingidae) of Rancho Laguna Blanca (RLB) is provided. A total of 63 species was recorded, about two-thirds of the Paraguay fauna, including formal documentation of five previously unrecorded species, which takes the country total to 95. The reserve is located in a transitional area from Atlantic Forest to C...

Las crotovinas o paleomadrigueras son relativamente frecuentes en varios países de la region como Brasil y Argentina, sin registros conocidos en Paraguay; por lo que en el presente trabajo damos a conocer las primeras de estas estructuras identificadas en sedi-mentos cuaternarios dentro del territorio paraguayo.

Anomalous plumage colourations are reported for three species of non-passerine birds from Paraguay, Limpkin (Aramaus guarauna; Aramidae), Nanday Parakeet (Nandayus nenday; Psittacidae), and the Little Woodpecker (Veniliornis passerinus; Picidae). A leucistic Limpkin is the first published report of a colour anomaly for the family Aramidae. The colo...

An annotated catalogue of the hawkmoths (Sphingidae) of Rancho Laguna Blanca (RLB) is provided. A total of 63 species was recorded, about two-thirds of the Paraguay fauna, including formal documentation of five previously unrecorded species, which takes the country total to 95. The reserve is located in a transitional area from Atlantic Forest to C...

The first confirmed records of Oxyteninae (Lepidoptera, Saturniidae) from Paraguay are presented herein. Two specimens from Reserva Natural Laguna Blanca (San Pedro) are assigned to Oxytenis modaustralis Brechlin, Meister & Käch, 2014.

The first confirmed records of Oxyteninae (Lepidoptera, Saturniidae) from Paraguay are presented herein. Two specimens from Reserva Natural Laguna Blanca (San Pedro) are assigned to Oxytenis modaustralis Brechlin, Meister & Käch, 2014. © 2016, Soc Hispano-Luso-Amer Lepidopterologia-Shilap. All rights reserved.

Studies on South American Gomphotheriidae started around 210 years ago and, 150 years later, the classic study “The mastodonts of Brazil” by Simpson and Paula Couto (1957) attempted to clarify the complex issues related to our understanding of these proboscideans. Here, we update state of knowledge regarding proboscideans in South America subsequen...

Eurysternus Dalman, 1824, es un genéro neotropical de escarabajos perteneciente a la tribu Oniticellini (Scarabaeidae, Scarabaeinae). Se distribuye desde el centro de México hasta el sur de Brasil y norte de Argentina; las especies de este género viven en diversos tipos de bosques y se alimentan de carroña, heces y hojarasca (Jessop, 1985; Hanski &...

Resumen.- Se presenta una lista preliminar de 19 especies de Saturniidae registradas en el Departamento de Ñeembucú, suroeste de la República del Paraguay, basada principalmente en especímenes de la colección IBISUNP. De estas, Pseudautomeris grammivora Jones e Ithomisa kinkelini Oberthür, son nuevos registros para el país. Palabras clave: Satúrnid...

New records of Myrmeleontidae from Paraguay are presented: Dimares elegans (Perty, 1833), Glenurus croesus Banks, 1922, Glenurus penningtoni (Navás, 1918a) and Vella fallax (Rambur, 1842). The total number of species now recorded from the country is fourteen among 11 genera. Specimens of Dimares elegans from east (Cerrado) and west (Chaco) of the P...

Developing paleontology, gold mining in the town of Paso Yobai and diamonds exploration in progress, all in Paraguay, are commented on in this presentation. At the approach, each of them was focused by three technicians of different disciplines. This produces ethical sense in common but with diverse feelings.

Five species of Castniidae are reported from Reserva Natural Laguna Blanca, Departamento San Pedro, Paraguay at the interface of the Cerrado and Atlantic Forest zones. These include a new country record Eupalamides geron (Kollar, 1839), a species formerly considered endemic to Brazil. The locality is thus one of the most biodiverse for the family i...

Sobre la ocurrencia de Urania leilus Linnaeus (Lepidoptera, Uraniidae, Uraniinae) en el Paraguay Resumen Se reportan los registros conocidos de Urania leilus (Linnaeus, 1758) en el Paraguay, en base a datos históricos y recientes. Abstract The known Paraguayan records of Urania leilus (Linnaeus, 1758) are reported based on historic and recent data.

The “Catálogos Sistemáticos de los Vertebrados del Paraguay”, published in two editions by Arnaldo de Winkelried Bertoni (1878-1973) during the early decades of the 20th Century, represented one of the fi rst attempts to collate in a single work the available information about Paraguayan birds. However various species listed in these works have bee...

Resumen.- Se revisan ejemplares del Museo Nacional de Historia Natural del Paraguay asignados a Sicalis columbiana y Saltator maxillosus en el catálogo de dicho museo, publicado en 1996. Se determina que los mismos corresponden realmente a Sicalis flaveola y Saltator similis, respectivamente. Adicionalmente se discute la nomenclatura empleada por A...

Resumen.- Se presentan algunos registros recientes de Ceretes marcelserres, un Castniidae poco conocido y raro en colecciones, para Argentina y Paraguay. Se incluyen breves comentarios sobre su biología y comportamiento. Palabras clave: Castniinae, Ceretes marcelserres, distribución, Argentina, Paraguay. Abstract.- Some recent records of Ceretes m...

Resumen.-Se presenta un catálogo de los Sphingidae depositados en el Museo Nacional de Historia Natural del Paraguay (MNHNPY). La colección, de más de 400 ejemplares, comprende, 74 especies en 3 subfamilias, 6 tribus y 22 géneros y esta contribución adiciona 14 especies a las citadas en la última lista publicada del MNHNPY, sobre la que se corrigen...

Reports of the existence of specimens in the Museo Schade of two species previously considered hypo-thetical in Paraguay are investigated. Specimens of Thraupis cyanoptera are confirmed to be referable to Thraupis sayaca. It is recommended that Thraupis cyanoptera be removed from the Paraguay doubtful list. The specimen of Anas sibilatrix cannot be...