Sundadanio echinus is a species of freshwater ray-finned fish belonging to the family Sundadanionidae, the tiny danios.

[3] It is endemic to Borneo and found in West Kalimantan (Indonesia) and western Sarawak (Malaysia).

It lives in peat swamps and blackwater streams.

[1] Sundadanio echinus reaches a maximum size of 2.1 cm (0.83 in) standard length.

[4]