Pethia reval, the red-finned barb,[2] or redfin two-banded carplet,[1] is a species of cyprinid fish endemic to Sri Lanka.

This species can reach a length of 3.4 centimetres (1.3 in) SL.

[3][4] Congener, Pethia cumingii, also a Sri Lankan endemic, has long been presumed to be dichromatic[5] with some populations exhibiting yellow fins and others displaying red fins.

In 2008, the red-finned populations were elevated to the status of species and given the name, Pethia reval, while the yellow-finned form remains P.

[6] It is P. reval, the red-finned species, that has been kept most frequently by aquarists since the 1930s though identified as P. cumingii throughout the aquarium literature and aquarium trade until recently.