Thynnichthys vaillanti is a species of cyprinid of the genus Thynnichthys.

[2] It inhabits rivers in eastern Borneo.

[2] Described by Max Carl Wilhelm Weber and Lieven Ferdinand de Beaufort in 1916, it has a maximum length among unsexed males of 26.4 centimetres (10.4 in) and is considered harmless to humans.

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

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