Buscar recursos académicos

Six populations of  Gymnocalycium paraguayense and G. fleischerianum , endemics of Paraguay and until present considered ad two different species,were studies using macromorphology, micromorphology and molecular data ba...

The fossils of the India Muerta Formation (Neogene, Tucumán Province, Northwestern Argentina) include several vertebrate groups, mainly metatherian, xenarthran, and notoungulate mammals. Nevertheless, these remains have...

The record of the genus Tapirus in South America is associated with the faunistic events of the Great American Biotic Interchange (GABI). The taxon is considered an immigrant of Holarctic origin. Although remains are sca...

Materias / palabras clave: No

Materias / palabras clave: Science

Materias / palabras clave: Science: Biology (General): Evolution; Science: Biology (General): Life

Materias / palabras clave: Science: Science (General); Science: Biology (General): Life; Science: Zoology; Agriculture; Science: Biology (General): Ecology

The primary goal of the workshop “Meet the Chibanians” held at Novi Sad in 2023—and of the resulting papers—is to establish a broad consensus among the researchers on exactly how to describe the place of hominin ...

Materias / palabras clave: Science: Botany

Summary Trace-element data for mid-ocean ridge basalts (MORBs) and ocean island basalts (OIB) are used to formulate chemical systematics for oceanic basalts. The data suggest that the order of trace-element incompatibili...

The organization of taking turns to talk is fundamental to conversation, as well as to other speech-exchange systems. A model for the turn-taking organization for conversation is proposed, and is examined for its compati...

Materias / palabras clave: animal systematics, evolution, animal diversity, conservation, taxonomy; Science: Biology (General); Science: Zoology

Materias / palabras clave: taxonomy, biosystematics, evolution, systematics, life science; Science: Biology (General): Evolution; Science: Biology (General): Life

Materias / palabras clave: biodiversity, plant science, taxonomy, molecular biology, systematics; Science: Botany

Materias / palabras clave: taxonomy, morphology, anatomy, phylogeny (molecular or morphology-based), historical biogeography and palaeontology, arthropods; Science

Materias / palabras clave: insect science, biodiversity, phylogeny, taxonomy, entomology; Science: Science (General); Science: Biology (General): Life; Science: Zoology; Agriculture; Science: Biology (General): Ecology

Materias / palabras clave: zoology, evolutionary biology, population genetics, systematic zoology; Science: Zoology; Science: Biology (General): Evolution

Cystoliths are phytoliths of silica and calcium carbonate and are produced in a few groups of dicotyledonous angiosperms. Anatomical and, more recently, phytolith studies have recorded them in different families. In the ...

As the twentieth century neared its midpoint, paleoanthropology was in dire need of revitalization and some coherent concept of evolution.  Sadly, as introduced to paleoanthropology by Ernst Mayr in 1950, the Modern Evo...

This paper serves as a reply to the Commentary by Brown and Gibbons (S Afr J Sci. 2022;118(9/10), Art. #12590) on our recently published paper on systematics of the moon jellyfish genus Aurelia (Lawley et al. PeerJ 2021;...

Dendromonocotylerajidicola n. sp. is described from the dorsal surface of the yellownose skate Zearaja chilensis (Guichenot) (Rajiformes) caught on the Argentine shelf. Dendromonocotylerajidicola n. sp. can be distinguis...

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...

Six productive samples from the upper part of the Early Carboniferous Ambo Formation at Pongo de Mainique, Peru, are analyzed for 55 recognized miospore species of continental origin. One new morphospecies, Cristatispori...