Characiformes
Order of fishes
Characiformes is an order of ray-finned fish, comprising the characins and their allies. Grouped in 28 recognized families, more than 2000 different species are described, including the well-known piranha and tetras. Characins are most diverse in the Neotropics, where they are found in lakes and rivers throughout most of South and Central America.
From Wikipedia, under CC BY-SA. More on occurri.