Ribotidae

Ribotidae is a family of freshwater fish belonging to the order Characiformes. The family is native to South America, primarily found in the Amazon and Orinoco river basins. Members of Ribotidae are commonly known as tetras, though this term is also applied to fish from other families, leading to some taxonomic confusion.

The most distinctive feature of Ribotidae is their generally small size, with most species measuring under 5 centimeters. They are characterized by a single dorsal fin and an adipose fin, which is a small, fleshy fin located behind the dorsal fin. Their coloration varies widely, with many species exhibiting bright, iridescent patterns that are often used in sexual displays.

Ribotidae are typically omnivorous, feeding on a diet of small invertebrates, plant matter, and occasionally fish eggs. They are often found in large schools, which is thought to provide protection from predators. Many species are popular in the aquarium trade due to their attractive appearance and relatively peaceful nature, though specific care requirements can vary significantly between species. Research into the family's phylogeny and diversity is ongoing, with new species occasionally being described.