Genetic diversity and species delimitation in Rhamdia (Siluriformes: Heptapteridae) in South America, with a redescription of R. quelen (Quoy amp; Gaimard, 1824).

More than 100 species have been referred to Rhamdia since its description, but in the last revision of the genus more than two decades ago, only eleven species have been considered as valid. Rhamdia quelen was then redefined to include 47 junior synonyms, resulting in a species with a large distribution in the Neotropics, from Mexico to Argentina. Populations of Rhamdia from west of the Andes have been recently removed from the synonymy of R.

Morphology and molecular data reveal the presence of two new species under Rhamdia quelen (Quoy Gaimard, 1824) (Siluriformes: Heptapteridae) species complex.

The eustatic movements triggered by glaciations during the Quaternary have shaped the landscape of Brazilian Atlantic Coast. Cyclic sea-level changes either isolated or connected freshwater fish populations, impacting their distribution and diversification. Rhamdia quelen has been widely recorded from the Brazilian Atlantic Coastal rivers, but it is also considered a species complex.

Development and characterization of microsatellite markers for the endangered Amazonian tree Aniba rosaeodora (Lauraceae).

Premise Of The Study: Microsatellite loci were isolated and characterized for Brazilian rosewood (Aniba rosaeodora), an endangered neotropical hardwood tree, to investigate population and conservation genetics of this highly valuable nontimber forest resource. •

Methods And Results: We used an enriched genomic library method to isolate and characterize 11 nuclear microsatellite loci for A. rosaeodora, which exhibited an average of 9.