Gymnogeophagus eocenicus, n. sp. (Perciformes: Cichlidae), an Eocene Cichlid from the Lumbrera Formation in Argentina
The occurrence of an Eocene fossil in the geographical area corresponding to the present distribution of the Gymnogeophagus genus suggests the patterns of distribution and endemism of the Neotropical fish fauna have a very old history in the continent.
Relationships among major lineages of characid fishes (Teleostei: Ostariophysi: Characiformes), based on molecular sequence data.
Morphology and histology of the male reproductive system in two species of internally inseminating South American catfishes, Trachelyopterus lucenai and T. galeatus (Teleostei: Auchenipteridae)
Examination of reproductive modifications in internally inseminating catfishes, ovaries and male reproductive systems were examined histologically in two species, Trachelyopterus lucenai and T. galeatus, from southeastern Brazil to allow for consistent terminology for comparison of regions of the male reproductive system based on presumed function.
Brachyhypopomus gauderio, new species, a new example of underestimated species diversity of electric fishes in the southern South America (Gymnotiformes: Hypopomidae)
Brachyhypopomus gauderio n. sp. is described here from the central, southern and coastal regions of the Rio Grande do Sul state, Brazil, from Uruguay, and from Paraguay. It is diagnosed from the…
Dispersal and vicariance of Hoplias malabaricus (Bloch, 1794) (Teleostei, Erythrinidae) populations of the Brazilian continental margin
The aim of this study was to test the hypothesis that the Brazilian coastal populations of Hoplias malabaricus were subject to the same geomorphological and palaeohydrological factors that resulted…
On the Eocene Cichlids from the Lumbrera Formation: Additions and Implications for the Neotropical Ichthyofauna
Molecular phylogenies calibrated with the Lumbrera Formation fossils suggest that the age of cichlids may be considerably older than the minimum age provided by currently known fossils, in combination with well-established family-level phylogenetic relationships compatible with Gondwanan fragmentation.
A review of the Cis-Andean species of Hemibrycon Günther (Teleostei: Characiformes: Characidae: Stevardiinae), with description of two new species
The distribution area of the genus is enlarged reaching the lower Tapajos, Tocantins and Xingu river basins, Brazil, with the first record of the occurrence of H. surinamensis in this country.
A NEW CICHLID TREMEMBICHTHYS GARCIAE (ACTINOPTERYGII, PERCIFORMES) FROM THE EOCENE-OLIGOCENE OF EASTERN BRAZIL
The fossil specimen described here, preserved as part and counterpart, is assigned to a new cichlid species, Tremembichthys garciae sp.
Revision of the neotropical cichlid genus Gymnogeophagus Ribeiro, 1918, with descriptions of two new species (Pisces, Perciformes)
The Neotropical cichlid genus Gymnogeophagus Ribeiro, 1918 is revised and the following species are considered valid and are redescribed: G. rhabdotus, G. meridionalis, sp.