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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...

Fil: Nenda, Santiago Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Arge...

The possible producer and environmental setting of large meniscate burrows (Nagtuichnus meuleni igen. and isp. nov.) occurring in late Miocene and Holocene aeolian deposits from Argentina are discussed. These are unbranc...

The recent discovery of pollen grains assigned to the earliest branch of Asteraceae from Cretaceous sediments in Antarctica prompted us to examine the pollen from five lesser known members of Asterales (Alseuosmiaceae, A...

In analyses of trophic networks, the complexities of animal communities often have to be reduced by grouping species that share similar features. Which group-defining features are most meaningful in a given context is a ...

We thank Panero for his interest in our paper. However, we consider his interpretations somewhat incomplete and misleading, principally because he reports results using methods that we did not apply in our study, and und...

Seasonality of reproduction in Buccinanops cochlidium, including mating, oviposition and embryonic development, was studied within a population in Patagonia. Mating was observed mainly during autumn and winter (March to ...

The clam Neilonella sulculata is the dominant bivalve on muddy bottoms along the Argentine continental shelf (Southwest Atlantic). The medusa stage of the hydroid Bougainvillia macloviana is one of the most abundant spec...

Species richness and faunistic affinities of gammaridean and corophiidean amphipods from southern Tierra del Fuego were studied. The material was collected with dredges and grabs at 7 locations (15 sampling stations) in ...

Fil: Barrionuevo, Jose Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”;...

Dysnoetoporidae is a family of cheilostome bryozoans including only the genus Dysnoetopora Canu and Bassler, 1926, with three recognized species from the Late Cretaceous of the United States, Crimea, and Germany. The aim...

Fossil insect nests with constructed walls (ichnogenera Uruguay ROSELLI 1938, Palmiraichnus ROSELLI 1987, Rosellichnus GENISE and BOWN 1996), as well as fossil brood masses from dung beetles (Monesichnus ROSELLI 1987) of...

The Paraná Basin was filled by a sedimentary package deposited in successive sedimentation episodes related to the tectonic events that hit the SW portion of the Gondwana. The Triassic portion of this package, known wor...

Se describen dos nuevas especies de Melitoma Lepeletier y Serville: M. fulviscopis n. sp. de Matto Grosso, Brasil, y M. torquata n. sp. del sudeste y sur de Brasil, y norte de la Argentina. Los machos presentan un partic...

Two new species in the South American sun-spider family Mummuciidae are herein described. Gaucha ramirezi sp. nov. is known from the Chancaní Provincial Park and Forest Reserve, Córdoba province, Argentina, and further...

Entre el Campaniano tardío y el Maastrichtiano temprano se produjo la ingresión del Mar de Kawas (Casamiquela, 1978), que inundó los valles fluviales patagónicos eliminando a sus pobladores estenohalinos. Los paleoam...

Cavernicolous species that exhibit a high degree of troglomorphism often provide some of the most intriguing evolutionary riddles. For such taxa, the correct systematic arrangement is difficult to determine and becomes p...

El crecimiento institucional experimentado por la Asociación Bernardino Rivadavia (Bahía Blanca, provincia de Buenos Aires) desde la década de 1930 puede explicarse a partir de su relación con fenómenos de diversa n...

Three specimens of Echinanthera cyanopleura, which represent the first record for the species in Argentina, have been examined at the Herpetological Collection from the former "Centro Nacional de Investigaciones Iológic...

Argentina: Formosa, Parque Nacional Pilcomayo (Abadía Cué). 14-19 de marzo de 1993. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" — Buenos Aires — Argentina (MACN 34689). S. Haene Heinomen y Gil G. C...