Thryssocypris smaragdinus is a species of freshwater ray-finned fishes belonging to the family Danionidae, the danios or danionins.

[2] It inhabits western Borneo in Indonesia.

[3] Its maximum length among unsexed males is 5.4 centimetres (2.1 in).

[3] It has 9 to 10 dorsal soft rays, 12 to 14 anal soft rays and 38 to 39 vertebrae.

[3] This Cyprinidae-related article is a stub.