Pyrrhulina is a genus of small characins in the family Lebiasinidae, found across the river systems of tropical South America; the atlas draws records from Brazil, Peru, Bolivia, Colombia, Guyana, Ecuador, Suriname, and Venezuela. They share the family's slender, cylindrical body and upturned, surface-oriented mouth, and most species carry a dark humeral spot behind the gill cover along with scattered dark blotches or a mid-body stripe on an otherwise translucent olive-to-gold body. They favor quiet, often blackwater-influenced streams, floodplain pools, and slow backwaters with overhanging vegetation, and like their relatives are generally egg-depositors, laying clutches on submerged leaves or plant surfaces rather than in open water, with some parental guarding by the male reported in several species. The atlas covers 20 species, adult size roughly 1–6 in.
Pyrrhulina are a modest but recognized part of the tetra-and-characin hobby, kept mainly by specialists interested in South American blackwater biotopes rather than in the general trade; species such as P. vittata (banded), P. filamentosa, and P. rachoviana turn up under their own or older synonym names. They are peaceful, understated schooling fish rather than showpieces, doing best in soft, acidic, well-planted tanks with subdued lighting and plenty of leaf litter or fine-leaved plants to mimic their native cover. Conservation-wise the genus looks comfortable: most assessed species are rated Least Concern, with the rest Not Evaluated or Data Deficient rather than flagged as threatened.