Aphyocharax
Aphyocharax is a genus of characins from South America , specifically the Amazon , Orinoco , Essequibo , Paraguay and Paraná basins . 
<triplet> Amazon <subj> South America <obj> continent <triplet> Orinoco <subj> South America <obj> continent <triplet> Essequibo <subj> South America <obj> continent <triplet> Paraguay <subj> South America <obj> continent <triplet> Paraná <subj> Paraguay <obj> tributary