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In continuation of an earlier paper on Pleurosigma species with an (almost) non-sigmoid valve and raphe sternum, a comparative study was made in LM and SEM of Pleurosigma subrectum and P. acus. For P. subrectum, slides a...

Eurytion yungarum n. sp. (Chilopoda: Geophilomorpha: Geophilidae) es descripta en base a un ejemplar colectado en el noroeste de Argentina (Jujuy: aproximadamente a unos 50 Km al oeste de Fraile Pintado), en la Provincia...

A new species of Sphaenorhynchus is described from the Municipality of Mariana, State of Minas Gerais, Brazil. It is characterized by the vocal sac moderately developed, single, subgular, with longitudinal folds; white c...

A new species of Oxalis from Santa Cruz, Argentina is described. The new species, Oxalis morronei, belongs to O. section Palmatifoliae because of its general morphology and distribution, but differs from the other specie...

The genus Rhabdotalebra Young is reviewed, including description of a new species, R. albinoi n. sp., from Buenos Aires province, Argentina. A detailed morphological description and illustrations of the new species are p...

We present a list of the type material of Heteroptera deposited in the entomological collection of the Museo de La Plata (Buenos Aires, Argentina) in the last six years and or, not included in previous catalogs. This cat...

In order to identify concordant distributions of endemic vascular plants in the Monte desert, we analyzed the distributional data of 180 species endemic to the Monte desert with the optimality criterion implemented in th...

Science carried out in South America has experienced a major rise in the levels of productivity and impact during the last decade. The continuity of this process depends upon strong policy decisions of personnel training...

The Paranapiacaba Mountains are a region of Brazil where the stonefly fauna is relatively well known. Despite this, there are still gaps in knowledge that need to be filled. In this study, through field sampling and mole...

Materias / palabras clave: Science: Biology (General); Science: Zoology; Science: Botany

Polyporus subpurpurascens is a rare Neotropical species characterized by deep purplish pilear surface and radially elongated pores. This study analyzed Neotropical specimens from Argentina, Bolivia and Brazil by applying...

In this study, we describe and illustrate Piriqueta crenata, a new species from the Chapada Diamantina region, Bahia,Brazil. It is similar to and was initially identified as P. flammea from which it can be distinguished ...

Currently, the genus Odontophrynus Reinhardt & Lütken comprises 11 species distributed in southern and eastern South America. Among them, O. americanus (Duméril & Bibron), O. lavillai Cei, O. cordobae Martino & Sinsch,...

SIGMODONTINAE, a diverse subfamily including 106 genera of American Rodents, is currently divided in eleven tribes that still need to be refined based on recently generated phylogenetic hypotheses. Several published name...

Subterranean tuco-tucos of the genus Ctenomys are caviomorph rodents comprising a complex of over 50 nominal species found in the southern half of South America. The validity of several nominal forms awaits a proper asse...

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...

During the revision of Kaunia (in prep.), we detected names which required typification or whose current typification was incorrect. After the analysis of protologues and original material, we designated six lectotypes a...