We describe a new species of a substrate-brooding Gymnogeophagus, based on coloration
characters. The new species can be distinguished from the remaining substrate-brooding …

Neotropical cichlids include over 550 species from Central and South America and the
Caribbean and are increasingly recognized as models for studying evolutionary …

Approximately two-dozen species in three genera of the Neotropical suckermouth armored
catfish family Loricariidae are the only described fishes known to specialize on diets …

A kawaio penak, a new genus and species, is described from the upper M azaruni R iver, G
uyana. The new species is diagnosed from all other species of H ypopomidae by several …

The South American cichlid genus Aequidens Eigenmann & Bray, 1894, with the type
species A. tetramerus Heckel, 1840, was once a major, speciose genus, recognised from the …

Ontogenetic diet shifts were compared among five sympatric pike cichlids Crenicichla in a
subtropical South American stream using stable C and N isotopes and tissue stoichiometry …

Morphological variants of Cichla temensis, readily differentiated by their striking color pattern
differences, are found in several Amazon basin flood pulse river systems. The adult variants …

Established empirical cases of sympatric speciation are scarce, although there is an
increasing consensus that sympatric speciation might be more common than previously …

Evaluating biodiversity and understanding the processes involved in diversification are
noticeable conservation issues in fishes subject to large, sometimes illegal, ornamental …

Background. Thirty species were previously recorded for unstructured habitats (unvegetated
soft substrates: USS) in Pantanos de Centla. However, a lack of information on the tropical …