Sundadanio retiarius

Sundadanio retiarius is a danionin in the family Cyprinidae. It is endemic to Kalimantan, Indonesian Borneo, and known from the Kotawaringin and Kahayan River drainages. It lives in peat swamps and blackwater streams.

Sundadanio retiarius reaches a maximum size of 1.9 cm standard length.