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Three little corys of the Brazilian Shield

The evolution of dwarf fish forms has taken place independently in many different regions of the world. Among the armored catfishes (Corydoradinae), there is a small group of species that are believed to have evolved millions of years ago. These dwarf Corydoras live in the great clearwater rivers of the 500-million-year-old Brazilian Shield.

The South American continent is comprised of very different geographical regions. Large mountain ranges created by tectonic plate shifts, such as the still-young Andes or the 1.9-billion-year-old formations of the Guiana Shield, frame the three major river basins of South America. Between the Guiana Shield and the

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