Phylogeny of the Eocene Antarctic Tapetinae Gray, 1851 (Bivalvia: Veneridae) from the La Meseta and Submeseta formationsMaximiliano Jorge Alvarez
Systematic analysis shows that the Southern Hemisphere bivalve genus Retrotapes includes the Antarctic species R. antarcticus, R. newtoni, and R. robustus and recognizes for the first time the presence of Katelysia represented by K. florentinoi. Two new genera were erected in this study: Marciachlys new genus to include M. inflata new combination, and Adelfia new genus, which includes A. austrolissa new combination and A. omega new species from the Eocene of Antarctica, and the late...
A prominent question in animal research is how the evolution of morphology and ecology interact in the generation of phenotypic diversity. Spiders are some of the most abundant arthropod predators in terrestrial ecosystems and exhibit a diversity of foraging styles. It remains unclear how spider body size and proportions relate to foraging style, and if the use of webs as prey capture devices correlates with changes in body characteristics. Here we present the most extensive...
Behavioral isolation can catalyze speciation and permit the slow accumulation of additional reproductive barriers between co-occurring organisms. We illustrate how this process occurs by examining the genomic and behavioral bases of pre-mating isolation between two bird species (Sporophila hypoxantha and the recently discovered S. iberaensis) that belong to the capuchino seedeaters, a recent, rapid radiation characterized by variation in male plumage coloration and song. Though these two species co-occur without ecological barriers to reproduction, we...
The ontogenetic pattern of neurocentral suture closure in the axial skeleton of Hyperodapedontinae (Archosauromorpha: Rhynchosauria) and its evolutionary implicationClara Heinrich, Voltaire Paes Neto, Marcel Lacerda, Agustin Martinelli, Maico Fiedler & Cesar Schultz
Understanding ontogeny of a taxon is a crucial step to properly elucidate its taxonomy and evolution. However, aside from histological data, osteological criteria for assessing maturity are considered lineage specific or controversial. The sequence of neurocentral suture closure of the axial skeleton of extant crocodilians, which occurs in a postero-anterior sequence, has being used as a non-destructive method to determine maturity in extinct reptiles. However, the use of this criterion in extinct archosaurs not closely...
Data for: Sexual dichromatism may not be a good index of sexual or natural selection in the blue cardinalids (Aves: Passeriformes).Natalia C. García, Ana S. Barreira & Pablo L. Tubaro
More than a century ago, Darwin and Wallace started a still ongoing debate over which are the predominant forces driving sexual dichromatism (i.e., differences in body coloration between males and females): is it sexual selection on males to become more attractive, or is it natural selection on females to become more cryptic? While these are not mutually exclusive, the degree of sexual dichromatism has been extensively used as a proxy of the intensity of one...
Late Mesozoic palaeobiogeography has been characterized by a distinction between the northern territories of Laurasia and the southern landmasses of Gondwana. The repeated discovery of Gondwanan lineages in Laurasia has led to the proposal of alternative scenarios to explain these anomalous occurrences. A new biogeographical model for late Mesozoic terrestrial ecosystems is here proposed, in which Europe and ‘Gondwanan’ territories possessed a common Eurogondwanan fauna during the earliest Cretaceous. Subsequently, following the Hauterivian, Europe severed...
Bernardino Rivadavia Natural Sciences Museum31
University of Buenos Aires4
University of Sao Paulo4
Sao Paulo State University3
National Scientific and Technical Research Council3
National Autonomous University of Mexico2
University of Leeds2
University of Birmingham2
American Museum of Natural History2