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We identified six fossil-species of angiosperms based on fossil woods from two small collections from the Beta Member (lower Campanian) of the Santa Marta Formation on James Ross Island: 1) Paraphyllanthoxylon antarcticu...

Se analizan 66 casos de mortandades masivas de peces en la Argentina, durante el siglo XX, cubriendo 95 años de observaciones. Los datos provienen de artículos científicos, información periodística y comunicaciones ...

With c. 24 700 species (10% of all flowering plants), Asteraceae are one of the largest and most phenotypically diverse angiosperm families, with considerable economic and ecological importance. Asteraceae are distribute...

We present quantitative data on the impact of different causes of mortality in a Geoffroy's cat (Leopardus geoffroyi) population inhabiting a protected area and adjacent cattle ranches in central Argentina. Between Decem...

The expansion of human populations associated with urbanization results in extensive modification of natural habitats. While many species cannot persist in these highly modified environments, some species adopt new strat...

La cuenca del Río Salado del Sur (34 a 36 ° LS) constituye el límite sud de la ictiofauna de aguas templadas en América Neotropical. Es un típico río de llanura y en la cuenca hay cientos de lagunas; esta región s...

El pectínido bisado “Chlamys” actinodes (SOWERBY, 1846) es una especie ampliamente distribuida en las sedimentitas de la Formación Puerto Madryn (Mioceno tardío) aflorantes en el noreste de la región patagónica ...

The cranial anatomy of Neoaetosauroides engaeus Bonaparte, 1969 from the upper part of the Los Colorados Formation, western Argentina, is addressed herein. This description is based on material collected recently, which ...

A partir de una etnografía realizada con quienes subsisten mediante la recuperación informal de residuos en el basural de Comodoro Rivadavia ?ciudad de la Patagonia Argentina-, el objetivo del artículo consiste en pon...

The present paper analyses different species belonging to the genus Classopollis (Pfl ug) Pocock & Jansonius with scanning electron microscopy (SEM). The material was collected from surface sections and boreholes of Cret...

This article assesses the current state of botanical collections in Argentine herbaria, with a particular focus on data and image digitization, collection management, and the publication of information through publicly a...

New records of the spider Chibchea salta Huber 2000 (Araneae, Pholcidae) from northwestern Argentina are provided, and the potential range of this species is modeled. Two presence-only methods, Maxent and Bioclim, were r...

A survey of the elemental contents of K, Mg, Mn, Na, Cl, Br, Cs, Co, Rb, Fe, Zn, Al, Ti, V, As, Ag, Au and Cd in liver, kidney and muscle was performed in specimens of Commerson's dolphins (Cephalorhynchus c. commersonii...

In order to characterize the diet of Astropecten brasiliensis and Luidia ludwigi scotti, the stomach content of both starfish species was analyzed. Starfishes were sampled for two years off Puerto Quequén coast in the B...

The distribution of cholecystokinin-like immunoreactivity was studied in the central nervous system of the heteropteran insect Triatoma infestans using high-sensitivity immunocytochemistry. In the protocerebrum, CCK-IR s...

El presente trabajo aborda el funcionamiento de los comedores escolares como dispositivo de política pública alimentaria en función del derecho humano a la alimentación adecuada durante la pandemia Covid-19, a partir...

Male genital mutilation is a common mechanism by which males reduce sperm competition by plugging female insemination ducts with different parts of its own genital system. This behavior is frequent in many spider familie...

En el invierno de 2013, en el marco del Programa de Capacitación de Vecinalistas que se desarrolló desde la Universidad Nacional de la Patagonia Ssn Juan Bosco, se planificó llevar adelante un ejercicio de mapeo socia...

Coastal regions are sectors where human activities impact the marine ecosystem, and if necessary control measures are not taken, they can generate negative consequences for health and ecosystem services. Within the frame...

Sperm transfer in spiders is achieved by copulatory organs on the male pedipalps (i.e., copulatory bulbs), which can be simple or a complex set of sclerites and membranes. During copulation, these sclerites can be used t...

The Microbiotheria constitutes a group of Australidelphian marsupials from South America. The biochron of the Microbiotheria extends from the early Paleocene to the present with a single living species (Dromiciops gliroi...

The fossil record of New World vultures (Cathartidae) and hawks (Accipitridae) in South America is extensive but still remains patchy, with relatively few records coming from northern South America. The aim of the presen...

Panochthus frenzelianus was described by Ameghino in 1889 based on a skull, mandible, cephalic shield, osteoderms from the posteriormost rows of carapace, and caudal rings. Unfortunately, the type specimen was not specif...

Los inicios de la paleoherpetología argentina se remontan a los orígenes de la ciencia en el país. En sus primeras décadas fueron clave el Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” en la Ciudad...